## Kerala Syllabus 10th Standard Physics Solutions Chapter 1 Effects of Electric Current

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## Kerala State Syllabus 10th Standard Physics Solutions Chapter 1 Effects of Electric Current

### Effects of Electric Current Text Book Questions and Answers

Textbook Page No. 7

SSLC Physics Chapter 1 Question 1.
Some electrical devices are shown in the house of the child. What are they?

• Electric bulb
• Electric fan
• Mixi
• Induction cooker
• Microwave oven
• Storage batten,
• Inverter

Textbook Page No. 8

HssLive Physics Chapter 1 Question 2.
Write down the energy changes in them with respect to their use.

Heating Effect of Electric Current Class 10 Question 3.
which are the devices that give heating effect of electric current?

• Electric iron
• Electric stove
• Microwave oven
• Heating coil
• Induction cooker

Textbook Page No. 9

Heat Chapter Class 10 Questions and Answers Question 4.

→ How does the ni-chrome wire become red hot while passing electricity through the circuit?
Due to the resistance of Ni-chrome wire.

→ In this case which form of energy was converted into heat energy?
Electrical energy

→ How does this energy change occur?
This based on the concept that energy can neither be created nor destroyed. It can only be converted from one form to another (Law of Conservation of Energy) As the resistance of Ni-chrome is higher it produced more heat.

Lighting Effect of Electric Current Question 5.

If the ammeter shows a current I ampere on applying a potential difference V across the resistor of resistance R Ω
Current $$I=\frac{Q}{t}$$
Then, the charge that flows through the conductor in t second,
Q = ……………coulomb.
Q = I × t coulomb

Heat Chapter Class 10 Question 6.
factors influencing the heat developed when a current passes through a conductor.

• Electric current
• Resistance of the conductor
• Time of current flow

Textbook Page No. 11

Question 7.
Complete the following table on the basis of Joule’s Law. (Page no.11).

Question 8.
Analyse the table and find out the factor that influences heat the most.
Intensity of current

Question 9.
Experiment (Textbook Page no. 11)

→ Of the water in beakers A and B which one got heated more? Why?
since nichrome has high resistance, more heat is produced. Hence temperature of water is increased.

→ What change is observed in the temperature of water in both the beakers when the current is increased using the rheostat?
As the current increases, the heat produced is increases.

→ What was the change that happened to the temperature of water in both the beakers on increasing the time?
Temperature is increased more

Textbook Page No. 12

Question 10.
Heat generated = 2400 J
If 4.2 J is one calorie then H = ……… calorie
H = 2400 J = $$\frac{2400}{4.2}$$ = 571.42 calorie

Question 11.
Let’s find out the heat developed in 3 minutes by a device of resistance 920 Ω working under 230 V.
V = 230V,
R = 920W,
t = 3 × 60 sec
I = $$\frac { V }{ R }$$ = $$\frac { 230 }{ 920 }$$ = 0.25
H = I2Rt = 0.252 × 920 × 3 × 60 = 10350 J

→ Is there any difference in the amount of heat energy thus obtained?
No

Textbook Page No. 13

→ How this problem can be solved using the relation, H = VIt.
V = 230 V,
R=920 W,
t = 3 × 60 sec
I = $$\frac { V }{ R }$$ = $$\frac { 230 }{ 920 }$$ = 0.25
H = VIt = 230 × 0.25 × 3 × 60 = 10350 J

Question 12.
Let’s calculate the heat developed when 3 A current flows through an electric iron box designed to work under 230 V.
V=230 V,
I = 3 A
t = 30 m = 30 × 60 = 1800 s
H = VIt =230 × 3 × 1800 = 1242000 J = 1242 kJ

Question 13.
Table 1.3

→ Why does the heater having low resistance get heated more?
Intensity of electric current is high.

→ In which way does the change in resistance influence the heat developed?
As resistance increases heat decreases.

→ Find out the current in the heaters A and B and compare the heat developed.
I = $$\frac{V}{R}$$
Heater A: I = $$\frac { 230 }{ 1150 }$$ = 0.2
Heater B: I = $$\frac { 230 }{ 460 }$$ = 0.5
In heater A and B, I increase H increases.

→ How do the resistors bring about a change in the current in the circuit?
As resistance increases, I decrease.

Textbook Page No. 14

Question 14.
Consider the fig 1.4(a) and 1.4(b).

→ In which circuit does the bulb glow with high intensity?
Circuit A [figure 1.4(a)]

→ Remove one bulb from each circuit. What do you observe?
In figl.4 (a)
In figl.4 (b)
In fig 1.4 (a) : bulb glows
In figl .4 (a) : bulb does not glow

→ Why do the bulbs in Fig 1.4 (a) glow with maximum brightness?
Ans: Low resistance

Textbook Page No. 15

Question 15.
Table 1.4.

Question 16.
Analyse the table and tick (✓) the best suited

Textbook Page No. 17

Question 17.
Complete Table 1.6 by analysing Tables 1.4 and 1.5.

 Resistors in series Resistors in parallel 1. Effective resistance increases 1. Effective resistance decreases 2. The current through each resistor is same as the main current. 2. The current through each resistor is different. It gets divided as per the value of resistors 3. The potential difference across each resistor is different. It gets divided as per the value of resistors. 3. The potential difference across each resistor will be the same 4. Each resistor cannot be controlled by separate switch, because the circuit is broken 4. Each resistor can be controlled by using separate switches.

Textbook Page No. 18

Question 18.
10 resistors of 2 Ω each are connected in parallel. Calculate the effective resistance.
R = $$\frac { 2Ω }{ 10 }$$ = 0.2 Ω

Textbook Page No. 19

Question 19.
A few heating appliances are shown in the figure(1.8). Examine any one of them and answer the following questions. Record the answers in the science diary.

→ Name the part in which electrical energy changes into heat energy.
Heatingcoil

→ Which material is used to make this part?
Nichrome:
Heating coils are made of nichrome. It is an alloy of nickel, chromium and iron.

→ What are the peculiarities of such substances?

• High resistivity
• High melting points
• Ability to remain in red hot condition for a long time without getting oxidized.
• Thermal expansion is negligible.

Textbook Page No. 20

Question 20.
Which are the circumstances that cause high electric current, leading to the melting of fuse wire?

Question 21.
How is the fuse wire connected to a circuit? In series/ parallel?
in series

Question 22.
You know that according to Joule’s Law, more heat will be produced when electric current is increased. What happens to the fuse wire due to this?
Fuse wire melts

Question 23.
When heat is generated, why does the fuse wire melt?
The melting point of fuse wire is lower than that of other metals

Question 24.
When the fuse wire melts, the circuit is broken. What happens to the current in the circuit?
The flow of current in the circuit stops simultaneously with the melting of fuse wire.

Question 25.
Why is the? fuse used in a circuit called safety fuse? Explain.
The current in the circuit may increase due to reasons such as short circuit, overload, excess flow of current or any problems in the insulation. As the higher temperature produced in the circuit due to these reasons makes the fuse wire to melt and the flow of current stops. Thus the circuit and the appliances are protected.

Question 26.
When a fuse wire is included in a household wiring. What are the precautions to be taken?

• The ends of the fuse wire must be connected firmly at appropriate points.
• The fuse wire should not project out of the carrier base.
• Use the fuse wire of proper amperage.

Question 27.
You might have noticed the marking of 500 W on an electrical appliance. What does it indicate?
It indicates the power of the instrument. The amount of energy consumed by an electrical appliance in unit time is its power.

Question 28.
What is the unit of power?
Watt (W)

Textbook Page No. 22

Question 29.
If R= V/I What will be P ?
P = IR = I × ……… = ……….
P = I2R = I2 × $$\frac { V }{ I }$$ = VI

Question 30.
A current of 0.4 A flows through an electric bulb working at 230 V. What is the power of the bulb?
V = 230 V
I = 4 A
P = VI
P = 230 × 4 = 92 W

Textbook Page No. 23

Question 31.
What happens if the interior of the bulb is not evacuated?
The interior of the bulb is evacuated to pr-event the oxidation of filament. When the tungsten comes in contact with the air in the heated condition
then it undergoes oxidation.

Question 32.
Why is the bulb filled with an inert gas or nitrogen?
To prevent the vaporization of filament.

Question 33.
What are the advantages of using tungsten as a filament?

• High resistivity
• High melting point
• High ductility
• Ability to emit white light in the white-hot conditions

Textbook Page No. 24

Question 34.
Nichrome is not used as filament in incandescent lamps. Why?
It can remain only in red hot condition but it can’t give light.

Question 35.
A filament lamp is lit for a short period of time. Touch it. What do you feel?
Heat is experienced.

Question 36.
What are the other types of lamps working on electricity? List them.

• Discharge lamp
• Fluorescent lamp
• Arc lamp
• CFL
• LED

Textbook Page No. 25

Question 37.
What are the advantages of using discharge lamps instead of incandescent lamps?
Loss of electricity in the form of heat is less, more life span, no shadow formation, more light is obtained, less consumption of electricity.

Question 38.
What are the factors to be considered when you select a bulb?
Efficiency, energy consumption, low energy loss, less environmental pollution.

Question 39.
Which are the lamps that are mostly used? Why?
LED: Low energy consumption, low energy 1 loss, less environmental pollution.

Question 40.
LED.

• LED’s are Light Emitting Diodes.
• As there is no filament, there is no loss j of energy in the form of heat.
• Since there is no mercury in it, it is not harmful to environment
• Very small
• It requires only small amount of power.
• No filaments

### Effects of Electric Current Let Us Assess

Question 1.
Fuse wire is to be used by understanding the amperage correctly. Write down the amperage of the fuse wires that are currently available in the market.
Fuse wire of suitable amperage should be selected. Amperage is the ratio of the power of an equipment to the voltage applied. Amperage increases with the thickness of the conductor. Thick wire takes more time to melt. Due to high current flow, the circuit may be damaged. If thin wire is used resistance is increased and hence current is reduced.
Amperage of available fuse : 0.1 A, 0.2 A, 0.5 A, 1.5 A, 3 A, 5 A.

Question 2.
0.5 A current flows through an electric heating device connected to 230 V supply.
a. the quantity of charge that flows through the circuit in 5 minutes is
i. 5 C
ii. 15 C
iii. 150 C
iv. 1500 C
b. How much is the resistance of the circuit?
c. Calculate the quantity of heat generated when current flows in the circuit for 5 minutes.
d. How much is the power of the heating device connected to the circuit if we ignore the resistance of the circuit wire?

Question 3.
According to Joule’s Law the heat generated due to the flow of current is H = I2 Rt. Will the heat developed increase on increasing the resistance without changing the voltage? Explain.
Heat decreases.
Reason H α $$\frac { 1 }{ R }$$

Question 4.
The table shows details of an electric heating device designed to work in 230 V. Complete the table by calculating the change in the heat and power on changing the voltage and resistance of the device. Analyze the table and answer the following questions.

a How does the voltage under which a device works affect its functioning?
b.What change happens to power on increasing the resistance without changing the voltage?
c. What change is to be brought about in the construction of household heating devices in order to increase their power?
a. As voltage increases, power increases
b. Power decreases
c. Use thick wire, use conductor of suitable material, use conductor of small length.

Question 5.
a. Complete the table based on the amperage of the fuse wire.

b. The amperage of the fuse wire used in a circuit that works on 230 V is 2.2 A. If so the power of the device is
i. less than 300 W
ii. 300 W to 500 W
iii. between 500 Wand 510 W
iv. more than 510 W
iii. between 500 W and 510 W

Question 6.
A 230 V, 115 W filament lamp works in a circuit for 10 minutes,
a. What is the current flowing through the bulb?
b. How much is the quantity of charge that flows through the bulb in 10 minutes?
a. I = $$\frac { P }{ V }$$ = $$\frac { 115 }{ 230 }$$ = 0.5 A

b.  Q = I × t = 0.5 × 10 × 60 = 300 c
Question 7.
An electric heater conducts 4 A current when 60 V is applied across its terminals. What will be the current if the potential difference is 120 V?
R = $$\frac{V}{I}=\frac{60}{4}=15 Ω If the voltage is changed to 120 V I = [latex]\frac{V}{R}=\frac{120}{15}$$ = 8 A

Question 8.
Three resistors of 2 Ω,3 Ω and 6 Ω are given in the class.
a. What is the highest resistance that you can get using all of them?
b. What is the least resistance that you can get using all of them?
c. Can you make a resistance 4.5 Ω using these three? Draw the circuit.
a. Highest resistance
R = R + R + R = 2 + 3 + 6 = 11 Ω

b. Least resistance

c. Yes

Question 9.
A girl has many resistors of 2 Q each. She needs a circuit of 9 Q resistance. For this draw a circuit with the minimum number of resistors.

Question 10.

If a bulb is lit after rejoining the parts of a broken filament, what change will occur in the intensity of the light from the lamp? What will be the change in the power of the bulb?

• Intensity of bulb
• Power increases.

Question 11.
Which of the following does not indicate the power of a circuit?
a. I28
b. VI
c. 1R2
d. V2/R
c. 1R2

Question 12.
How much will be the power of a 220 V, 100 W electric bulb working at 110 V?
a. 100 W
b. 75 W
c. 50 W
d. 25 W
d. 25 W

Question 13.
Which of the following should be connected in parallel to a device in a circuit?
a. voltmeter
b. ammeter
c. galvanometer
a. voltmeter

Question 14.
When a 12 V battery is connected to resistor, 2.5 mA current flows through the circuit. If so what is the resistance of the resistor?

Question 15.
If 0.2Ω, 0.3Ω, 0.4 Ω, 0.5 Ω, and 12Ω resistors are connected to a 9 V battery in parallel, what will be the current through the 12 Ω resistor?
I = $$\frac{V}{R}=\frac{9}{12}$$ = 0.75 A

Question 16.
How many resistors of 176 Ω should be connected in parallel to get 5A current from 220 V supply?
a. 2
b. 3
c. 6
d. 4
4

Question 17.
Depict a figure showing the arrangement of three resistors in a circuit to get an effective resistance of
(i) 9 Ω
(ii) 4 Ω
i.

ii.

### Effects of Electric Current Extended Activities

Question 1.
Analyse and describe the working of a microwave oven.
Microwave oven is a device which is used for heating effect of electric current. It produces heat without a heating coil. Eddy current is used in the working of microwave oven. The heat is generated as a result of microwave radiations. The water molecules are stimulated using ‘magnet one’ and thus attains high temperature. Metal utensils are avoided and the substances without water content are not heated by this.

Question 2.
How does an arc lamp help in rescue operations?
The intense light of arc lamps are used in search lights and rescue operations during night time. It is used to rescue the victims of natural calamities, boat accidents.

Question 3.
With the help of teachers and the Internet find out the following
a. What is the percentage of nickel, chromium and iron in Nichrome?
b. How much is the melting point of nichrome in degree Celsius?
c. How much is the resistivity of Nichrome?
d Does the result of your observation justify the use of nichrome as a heating element?
a. 61 % Ni, 15% Cr, 24% Fe
b. 1350°C
c. (1.0 – 1.5)x 10 – 6 Ωm
d. 1. High resistivity
2. High melting points
3. Ability to remain in red hot condition for a long time without getting oxidized. :
4. Thermal expansion is negligible.

Question 4.
Analyse the merits and demerits of the following lamps and find out which is best in the group. Justify your answers.
a. filament lamp
b. fluorescent lamp
c. arc lamp dCFL
e. LED bulb
a. Filament lamp:
Demerits: Loss of energy as heat, low light, low light.
Merits: Work in both DC and AC.

b. Fluorescent lamp:
Demerits: Cause environmental pollution,
Merit: Produce more light

c. Arc lamp:
Demerits: Carbon rods are to be changed frequently.
Merit: Intense light is produced.

d. CFL:
Merit: Produce more light at low power.
Demerits: Cause environmental pollution,

e. LED Bulb :
Merit: No environmental pollution, low energy consumption, long life. The best lamp is LED.

### Effects of Electric Current Orukkam Questions and Answers

Question 1.
Complete the table based on the effects of electric current and energy change.

a. Light energy
b. Mechanical effect
c. Heat energy
d. Chemical effect

→ Given below questions are related with heating of an electric iron box. Answer them.
a. Which is the part that produces heat in an electric iron?
b. Which nature of this part is made use in the above situation?
c. What is the relation between intensity of electric current and heat energy generated?
d. What are the factors that affect the heat generated in such heating appliances?
e. What is the relation connecting these factors with the heat generated?
f. What is this law known as?
g. Name a device that works on this law used for ensuring safety in electric circuits?
a. Heating coil
b. High resistivity, High melting point
c. As electric current increases, Heat energy increases.
d. Electric current, Resistance, time
e. H = I2 Rt
f. Joules law
g. Safety fuse

Question 2.
Incandescent lamp, discharge lamp, C.F.L, LED lamp, arc lamp are given for observation (Otherwise, make use of their pictures)
Answer the following questions after observing them.
a. Which metal is used to make filament of an incandescent lamp? What are the advantages of using this metal as a filament?
b. Name the lamps which belong to the group of discharge lamp.
c. The color of the light depends on the gas inside the discharge lamp. Which gases are to be filled for getting white light and yellow light?
d. Which lamps are harmful to environment because of the presence of mercury in it?
e. Which lamp is used in rescue work during night time and used in searchlights?
a. Tungsten. Advantages of tungsten are high ductility, high resistivity, high melting point
b. Fluorescent lamp, CFL, LED, Arc lamp.
c. For white light – Mercury
For yellow light- Sodium Vapour
d. Fluorescent lamps
e. Arc Lamp

### Effects of Electric Current SCERT Questions and Answers

Question 1.
Observe the circuit diagram given below and answer the following questions.

a. Which are the instruments labeled as P and Q in the diagram?
b. If you replace the copper wire AB with a Nichrome wire of same length and area of cross-section.
i. What change would you notice in the reading on the device Q? Why?
ii. What will happen to the heat produced in the conductor? Explain with reference to Joule’s Law.
a. P- Rheostat.
Q- Ammeter.

b. i. Reading will decrease. Due to higher resistance current decreases
ii. Because of Nichrome’s high resistivity, the current in the circuit will decrease. According to Joules law H= I2 Rt, decrease in the amount of current will reduce the amount of heat.

Question 2.
Write down the names of four types of lamps working on the lighting effects of electricity.
Discharge lamp, Fluorescent lamp, LED, Arc lamp.

Question 3.
Two types of lamps are given below.
1. Discharge lamp
2. Filament lamp.
a. If nitrogen gas is filled in each lamp, what change will happen to their working?
b. Why is it said that the use of filament lamp must be controlled?
a. Nitrogen filled discharge lamp will give red light, but in a filament lamp nitrogen is filled to reduce the evaporation of the filament.

b. In a filament lamp, major part of the electrical energy we supply is converted into heat energy.

Question 4.

a. Identify the device shown in the picture.
b. How are such devices used in rescue ope-rations?
a. Arc lamp

b. Light intensity in an Arc lamp is very high compared to other lamps, so Arc lamps are helpful in rescue operations even in adverse climatic conditions.

Question 5.
Observe the diagram and answer the questions below.

a. Which bulbs will glow when S1 switched on?
b. Which bulbs will low when S1 and S1 are switched on?
c. What change will happen to the circuit when S3 is switched on?
d. Calculate the amperage of the fuse to be used in the circuit,
e. Describe short circuit and overloading with the help of the given circuit
a. B1
b. Bulb will not glow, (fuse burns out due to overloading)
c. The circuit breaks as fuse burns out due to short circuit.
d. Amperage
$$\frac{200}{100}=2 A(\text { more than } 2 \mathrm{A})$$
e. Short circuit happens when two wires in the mains in contact without the presen-ce of a resistance in between. Over loading is connecting appliances with more power in the circuit, that it can bear.

Question 6.
A 800W electrical device is designed to work in 200V. What will be its power if the device is working in 100 V?
Resistance of the appliance

Question 7.
Bulbs marked 200V and 500W are shown in the picture.

a. Calculate the resistance of each bulb in the circuit.
b. What is the power with which the bulb in circuit 1 glows?
c. What is the power of the bulb in circuit 2? Why?
d. How is the power and resistance of an electrical device related to each other when the voltage is the same?
Resistance of B1 = $$\frac { V2 }{ P }$$ = $$\frac { 200 × 200 }{ 50 }$$ = 800 Ω
Resistance of B2=800 Ω

b. Will work in 50 W

c. Since the 50 W bulbs are in series current will be equal and voltage will behalf. Since P=VI, Power also will become half.

d. P = $$\frac { V2 }{ R }$$ (No change in resistance, Power will change)

Question 8.
Electric bulbs are connected in a 240V supply line are shown in the figure.

a. What is the total wattage of appliances used in the circuit?
b. Calculate the amperage of the fuse to be used in the circuit.
a. P = 20 W+ 20 W + 20 W = 60W

Question 9.
Given below are the steps in the working of a fluorescent lamp. Arrange them in the proper order.
a. Ultraviolet rays are produced
b. Visible light is emitted.
c. Fastly moving electrons collide with the unionized molecules of mercury.
d. Due to electric current thorium oxide coated heating element becomes red hot.
(d),
(c),
(a),
(b)

Question 10.
Correct the mistakes, if any:
a. Amperage decreases in proportion to the decrease in the area of cross-section of the conductor.
b. Connecting appliances in a circuit beyond its power capacity is short circuit.
c. It is to reduce the heat loss that electric lamps are filled with inert gases.
b. Overloading is connecting appliances with more power in the circuit, than it can bear.
c. Inert gases are filled in filament lamps to reduce the rate of evaporation.

Question 11.
Power of an electric heater working in 230 V is 1000 W. Calculate the heat produced if the current passes for 5 minutes through the circuit.
Heat = P × t
= 1000 × 5 × 60
= 300000 J

Question 12.
An electric bulb has marking 110 V, 100 W on it.
a. How much energy is used per second by the circuit?
b. What is the resistance of electric bulb?

Question 13.
Fill up the blanks by finding the suitable relationship.

A= Fuse wire
B= High melting point

Question 14.
If the resistance of two soldering irons working in 250 V are 500 Ω and 750 Ω.
a. Calculate which one of these will carry more current.
b. Find out which soldering iron has more power.
c. Calculate the heat produced in 5 minutes in the soldering iron having resistance 750 Ω.

b. Soldering iron has less resistance

Question 15.
Two bulbs of 500 W and 100 W are connected parallel in a circuit of 250 V.
a. Which bulb will have more brightness?
b. Through which bulb is current greater?
c. Find out the resistance of filaments in each bulb.
d. Which of these two bulbs will glow with more brightness if they are connected in series? Explain the reason.
a. 500 W Bulb

b. Bulb which has power 500 W (P = VI).

c. 500 W bulb
R = $$\frac { V2 }{ P }$$ = $$\frac { 250 × 250 }{ 500 }$$ = 125 Ω
100 W Bulb
R = $$\frac { V2 }{ P }$$ = $$\frac { 100 × 100 }{ 250 }$$ = 40 Ω

d. 100 W bulb — Current will be the same in series, High resistance bulb will shine more brightly.

Question 16.
Fill in the blanks suitably using the relationship in the first pair,
a. Filament: High melting point
Fuse : ………………
b. Nitrogen filled discharge lamp : Red
………………………… : Blue
a. Low melting point

b. Hydrogen used in discharge lamp

Question 17.
Choose and write the facts related to LED lamps from the given list.
a. Require only a small quantity of power.
b. UV rays are produced due to electric discharge.
c. Not harmful to environment since there is no mercury.
d. Intense light is produced when high voltage is applied.
a, c

### Effects of Electric Current Exam Oriented Questions and Answers

Very Short Answer Type Questions (Score 1)

Question 1.
Using the relation from the first pair, complete the other.
Filament: Tungsten Heating coil:
Nichrome

Question 2.
Which of the given material has the highest resistivity?
a. Nichrome
b.Copper
c. Aluminium
d. Silver
Nichrome

Question 3.
What is the color of the light emitted by discharge lamp filled with nitrogen when it works ?
Red

Question 4.
Using the relation from the first pair, complete the other.
Fuse wire : low melting point
Tungsten: …………..
High melting point

Question 5.
Which among the following is the special characteristics of a material to be used as a heating coil in a electric heating device?
a. Low melting point
b. High resistivity
c. Large area of cross section
d. Low resistance
High resistivity

Question 6.
Which material is used as filament of bulb?
Tungsten

Question 7.
Find out the odd one from the following also write the reason.
[long glass tube, Mercury vapor, Fluorescent coating, Thin tungsten filament]
Thin tungsten filament. Others are parts of a fluorescent lamp.

Question 8.
If we apply 230 V for a device having 230 V and 400 W, what will happen the power of the device ?
(increases, decreases, doesn’t change)
decreases

Question 9.
In incandescent lamp nichrome is not used as filament. Choose the reason from the following
a. Glows brightly
b. It emit white light when it is in hot condition. ,
c. It can remain only in red hot condition but it can’t give light.
c

Question 10.
Find out the odd one which is not suitable for the advantages of LED.
a. It requires only a small quantity of power.
b. It is not harmful to environment.
c. Ultraviolet fays are formed due to discharge.
c

Short Answer Type Questions (Score 2)

Question 11.
A 400 W electrical device is designed to work in 100 V. What will be its power if the device is working in 100 V?
Resistance of the appliance
R = $$\frac { V2 }{ P }$$ = $$\frac { 100 × 100 }{ 400 }$$ = 25 Ω
Power when connected in 100 V
P = $$\frac { V2 }{ R }$$ = $$\frac { 100 × 100 }{ 25 }$$ = 400 Ω
b,
d,

Question 12.
An electric bulb marked 500 W, 250 V is connected to a 250 V supply.
a. Find the electric current through the circuit.
b. Calculate the resistance of the bulb.

Question 13.
What are the advantages of fluorescent lamps over incandescent lamps.

1. Saves electrical energy to a greater extent.
2. The inconvenience caused by shadow is minimized.
3. The life of fluorescent lamp is about 5 times that of incandescent lamps.

Question 14.
Complete the table suitably.

 Gas-filled in the discharge lamp Colour Hydrogen (a) (b) Orange-red Nitrogen (c) (d) Green

a. Blue
b. Neon
c. Red
d. Chlorine

Short Answer Type Questions (Score 3)

Question 15.
In figure, Beakers A and B contain 100 ml water. PQ is a nichrome wire and RS is a copper wire of same length and diameter.

a. Water in which beaker will be at higher temperatures? What is the reason?
b. If the current is doubled using the rheostat, what happens to the quantity of heat produced in the wire PQ?
a. Beaker A, since the combination is series, the current remain same. As nichrome has high resistance, more heat is produced in it. (H = I2 Rt)

b. Heat produced becomes 4 times.
Heat H = I2 Rt, Heat increases as current is squared.

Question 16.
Classify the following as those suitable for fluorescent lamps and for arc lamps.
a. The main part is carbon rods.
b. The heating coil is coated with thorium oxide.
c. used in searchlights.
d. more harmful for the environment.
e. more intense light.
f. ultraviolet rays are produced.
Arc lamps: a, c, e
Fluorescent lamps : b, d, f

Question 17.
Find out the relation and complete the missing parts.
i. tungsten: ………….. (A) ……………. : high melting point
ii. alloy of suitable : fuse wire: ……….(B)……….. metals
iii (C)…….. heating coils: high melting point
A. Filament
B. Low melting point
C. Nichrome

Question 18.
The filament of a filament lamp is broken. It is rejoined and is lit again.
a. What happens to the intensity of light from it? Describe the reason behind.
b. Incandescent lamps are filled with nitrogen at low pressure. What is the advantage of doing so?
c. You are given two filament lamps of resistance 75012 and 100012. Of these, which has more power?
a. Increases. Because resistance decreases and current increases when length decreasing.

b. Nitrogen doesn’t expand over less change in temperature. At normal temperature it behave as a inert gas. It is plenty in atmosphere.

c. 750 Ω

Questions 19.
Choose the appropriate items from the box.
Nichrome, Tungsten, Fuse Wire, Nitrogen
a. Which is used as heating coil ?
b. Which is an alloy of tin and lead?
c. Which is used as filament ?
a. Nichrome
b. Fuse wire
c. Tungsten

Short Answer Type Questions (Score 4)

Question 20.
a. What is meant by amperage ?
b. An appliance of power 690 W is used in a branch circuit. If the voltage is 230 V,what is its amperage?
a. Amperage is the ratio of the power of an equipment to the voltage applied.
b. A = $$\frac { P }{ V }$$ = $$\frac { 690 }{ 230 }$$ = 3 A

Question 21.
Analyse the table and fill it suitably.

(1) 9 times,
(2) Series,
(3) 1/16 times

Question 22.
An electric heater working at 230 V produces 1000 J energy in one second.
a. What is the power of the lamp ?
b. Calculate the resistance of the heating coil used in it.
c. Calculate the heat generated by it when it works for 5 minute.

Question 23.
Write down the reasons for the following statements.
a. Don’t throw unwanted fluorescent tubes.
b. Nichrome is not used as filament in incandescent lamps.
c. Fuse wire is melt when electric current increased.
d. Why is the incandescent filled with an inert gas or nitrogen?
a. It contains mercury which causes several environmental problems.
b. It can remain only in red hot condition but it can’t give light.
c. When current flows as the higher temperature produced in the circuit. Fuse wire has low melting point compared to other, so it melts.
d. To prevent the vaporization of filament.

Memory Map:

## Kerala Syllabus 10th Standard Social Science Solutions Part 2 Chapter 8 Resource Wealth of India

You can download Resource Wealth of India Questions and Answers, Summary, Activity, Notes, Kerala Syllabus 10th Standard Social Science Solutions Part 2 Chapter 8 help you to revise complete Syllabus and score more marks in your examinations.

## Kerala State Syllabus 10th Standard Social Science Solutions Part 2 Chapter 8 Resource Wealth of India

### Resource Wealth of India TextBook Questions and Answers

Resource wealth of India Question 1.
Name the different sectors that are the basis of Indian economy

• Agriculture
• Transport
• Communication
• Energy production
• Mining

Zaid Crops Examples Question 2.
Observe the map and identify major rice producing states in India.

1. West Bengal
2. Assam
3. Odisha
4. UP
5. Bihar
7. Telangana

Universal Fiber Crop Question 3.
What are the favorable conditions for the cultivation of diverse agricultural crops in India?

• Suitable agricultural climate that extends throughout the year
• Fertile soil
• Suitable physiography
• Irrigation facilities

Which Crop is Known as Universal Fiber Question 4.
…………. is called golden fiber
Jute

Question 5.
Complete the following chart.

1. Cash crops
2. Fibre crops
3. Plantation crops
4. Beverages

Universal Fibre Crop Question 6.
Match the following.

 A B Food crop Rubber Cash crop Jute Fiber crop Cotton Plantation crop Wheat

 A B Food crop Wheat Cash crop Cotton Fibre crop Jute Plantation crop Rubber

Coffee Raw Material Question 7.
Distinguish between Kharif crops, Rabi crops and Zaid crops. Give examples for each
Kharif crops: Crops that are cultivated at the beginning of monsoon and harvested by the end of monsoon.
Eg. rice, cotton.
Rabi crops: Crops that are cultivated by the beginning of winter season and harvested by the beginning of summer.
Eg. wheat
Zaid crops: Crops that are cultivated by the beginning of summer and harvested by the beginning of monsoon.
Eg. fruits, vegetables.

Electroplating Plant Question 8.
Which crop is called universal fibre? Why?
Cotton is called universal fibre. Cotton is widely used all over the world as the raw material for textile industry. Hence it is known as ‘Universal fibre’.

Rubber Industry Question 9.
Categories the following crops into food crops and cash crops
Rice, wheat, cotton, tea, coffee, pulses, tobacco, maize, ragi, rubber

 Food crops Cash crops 1. Rice 1. Cotton 2. wheat 2. Tea 3. Pulses 3. Coffee 4. Maiza 4. Tobacco 5. Ragi 5. Rubber

Question 10.
Observe the map of India and name the major wheat-producing states in India.

• Punjab
• U.P.
• Hariyana
• Utterakhand
• M.P
• Rajastan
• Bihar

Question 11.
What are the geographical conditions suitable for wheat cultivation?
The geographical conditions suitable for wheat cultivation are:

• Fertile plain lands.
• Temperate regions conducive for wheat cultivation
• Availability of porous or well-drained fertile soil with content of lime.
• Average temperatures of 10°C during planting and 15°C to 26°C during harvesting period and 75 cm of rainfall are needed for wheat cultivation. These conditions are available in these states.
• Rainfall received from western disturbance is suitable for the cultivation of rabi crops like wheat.

Question 12.
Wheat is not cultivated in Kerala. Why?
Wheat cultivation is not possible in Kerala because,

• Scarcity of alluvial soil
• High temperature
• Poor irrigation facilities

Question 13.
Which are the soils ideal for cotton cultivation?

• Black soil of Deccan plateau
• Alluvial soil of North Indian Plain.

Question 14.
What are the raw materials for iron and steel industry?

• Irone ore
• Manganese
• Coal
• Limestone

Question 15.
Distinguish between metallic minerals and non- metallic minerals.

• Minerals with metallic content are called metallic minerals. Eg. iron ore.
• Minerals without metallic content are called non-metallic minerals. Eg. Mica.

Question 16.
Iron is considered as the basis of all industries. Why?

• Machines and tools made of iron are used widely.
• The amount of iron used in a country determines its standard of living.

Question 17.
Which are the four varieties of iron ore?

• Magnetite
• Hematite
• Limonite
• Siderite

Question 18.
Name the non-metallic minerals.

• Limestone
• Mica
• Gypsum
• Coal
• Petroleum

Question 19.
Is there any metro project in Kerala?
Yes, Kochi metro

Question 20.
How many international airports are there in Kerala? Which are they?
4 airports.

1. Thiruvananthapuram
2. Nedumpasseri
3. Kozhikode (Karipur)
4. Kannur

Question 21.
Which are the major iron and steel industries in India?

• Tata Iron and Steel factor (TISCO)
• Visvesvaraya Iron and steel factory limited (VISL)
• Bhilai Steel Plant
• Durgapur Steel Plant
• Rourkela Steel Plant
• Bokaro Steel Plant
• Indian Iron and Steel Company
• Visakhapatnam Steel Plant.

Question 22.
Describe the two agro-based industries in India. Agro-based industries are those that use agricultural products as raw material. The two major agro-based industries of India are cotton textile industry and sugar industry.

Cotton textile industry: This is the biggest agro-based industry in India. India has been renowned for cotton clothes since very old times. The first cotton mill in India was established at Fort Gloster near Kolkata in 1818. The large scale cotton textile industry began to function at Mumbai in 1854. Mumbai is the largest cotton textile manufacturing centre in India. Though cotton textile mills function in various parts of the country, the majority of them are located in the states of Maharashtra and Gujarat.

Sugar industry: Among agro-based industries, sugar holds the second place. If sugarcane is kept for a longer period after their cropping, the content of sugar (sucrose) in it decreases. Therefore all sugar factories have been located near sugar fields. About 60% of the sugar being manufactured in India is from the states of Uttar Pradesh, Bihar, and Maharashtra. Uttar Pradesh leads both in the production of sugarcane and sugar. The majority of the sugar industries in India are concentrated in the states of Uttar Pradesh and Bihar. So these states are known as the sugar belt of India.

Question 23.
Compared to road transport, what are the advantage of rail, water, and air transport?
Each means of transport has its own advantage. Road transport is the best for short distances. But the other means of transport have certain advantages over road transport.
Rail transport:

• Suitable for long-distance travel and cargo.
• Can rest while traveling.

Water transport:

• Less air pollution.
• Less sound pollution.
• Less cost for construction and maintenance of water transport route.
• Transportation of heavy cargo.
• Helps international trade.

Air transport:

• Suitable for rugged terrain and in places which cannot be reached by roads and railways.
• Most speedy form of transport.

Question 24.
Which are the Indian states leading in spice production?
Kerala, Karnataka, Tamil Nadu

Question 25.
The states of Uttar Pradesh and Bihar are known as the ‘Sugar Belt of India’. Why?
Among the sugar industries in India, majority of them are set up in Uttar Pradesh and Bihar.

Question 26.
Complete the chart

 Cash crops Agro-based industries 1. Cotton 2. Jute 3. Rubber 4. Oilseeds

 Cash crops Agro-based industries 1. Cotton 1. Cotton textile industry 2. Jute 2. Jute industry 3. Rubber 3. Footwear, Sports goods, Cables, Cushions 4. Oilseeds 4. Paint, Varnish, Soap, Lubricants, Spices

Question 27.
All sugar industries have been located near sugar fields, Why?
The juice is to be extracted immediately after the harvest of sugarcane. Otherwise, the quantity of juice and the amount of sucrose in the juice will be less. That is why sugar industries are located near sugar fields.

Question 28.
What are the raw materials for agro-based industries?
Sugarcane, cotton, jute, rubber, oil seeds

Question 29.
Which are the major agro-based industries in In-dia?
Sugar industry, cotton textile industry, jute industry, paper industry, woollen industry, silk industry, paint industry, varnish industry, soap industry, rubber industry, etc.

Question 30.
Identify the Indian states where sugar factories are located.
Punjab, Haryana, Uttar Pradesh, Bihar, Maharashtra, Andhra Pradesh, Karnataka, Tamil Nadu.

Question 31.
Name major tea producing states in India.

• Assam
• West Bengal
• Kerala

Question 32.
Complete the flow chart of industries in India.

Question 33.
Match the following.}

 A B Cottonopolis Sugarcane Universal fibre Mumbai Arabica Rubber Kerala Cotton U.P. Coffee

 A B Cottonopolis Mumbai Universal fibre Cotton Arabica Coffee Kerala Rubber U.P. Sugarcane

Question 34.
Rail and road transports are not developed in north-east states of India and in the regions lying close to the Himalayas. Why?
Idukki and Wayanad districts in Kerala have no railway lines. Why?
The construction of road and railway network is difficult in mountainous regions, hilly areas, valleys, and slopes. The above-said regions belong to such places.

Question 35.
What is the importance of agro-based industries?
These industries contribute substantially to India’s national income.
They are a base for huge employment potential

Question 36.
What are the conclusions to be drawn on the analysis of the location of the agro-based industries in relation to agricultural regions?
All the agro-based industries of India are located near to places where the raw materials for them are cultivated. This enables to get raw materials cheaply and in plenty. For eg: Mumbai and Ahmedabad, the centers of cotton textile industry in India are located near to places where cotton is cultivated on a large scale.

Question 37.
Which are the fossil fuels?

• Coal
• Petroleum
• Natural gas

Question 38.
Point-out conditions required for rubber cultivation.
Temperature raging from 25°C to 35°C and annual rainfall of over 150 cm are ideal. Laterite soil is ideal.
Kerala, Karnataka and Tamil Nadu are the leading producers.

Question 39.
Mumbai is the largest cotton textile manufacturing center in India. What are the reasons for this?

• Availability of abundant raw materials
• Humid climate
• Availability of electricity at cheaper rate
• Availability of freshwater
• Nearness to harbor

Question 40.
Classify the roads in India

Question 41.
Which is the largest mineral-based industry in India? Why is it called basic industry?
Iron and steel industry is the largest mineral-based industry in India. The measuring rode of the industrial progress of any nation is calculated on the basis of the production and consumption of iron. The present progress in the country is due to the growth of iron and steel industry. Many other industries depend on this industry. It laid the foundation for rapid industrialization in India. So it is called the basic industry.

Question 42.
Consider the map showing parts of India

Name the important ports

1. Kandla
2. Mumbai
3. Goa
4. Mangalore
5. Kochi
6. Thoothukudi
7. Chennai
8. Vishakhapatnam
9. Vishakhapatnam
11. Kolkatta

Let Us Assess

Question 43.
Starting cultivation by the end of winter season and take harvest before rainy season’. Which agricultural season is mentioned here? Which are the main crops of this season?
Zaid season
Main crops: Fruits and vegetables

Question 44.
Prepare short notes
ii) Universal fibre
Golden quadrangle: Golden quadrangle is the Express Highway that links the four metropolitan cities of India. In addition to this, the Government of India has planned under the category of Expressways, a North-South (Srinagar to Kanyakumari) and east-West (Silcharto Porbandar) corridor.

Universal fibre: Cotton is called universal fibre. Cotton is widely used all over the world as the raw material for textile industry. Hence it is known as ‘Universal fibre’.

Question 45.
Identify the following ports.
i) Port at southern end
ii) Main port of Karnataka
iii) Important port in West Bengal other than Kolkotta
i) Thoothukudi
ii) Mangalore
iii) Haldia

Question 46.
During which season are crops like Maize, Cotton and Jute are cultivated.
Kharif

Question 47.
Which one of the following is a winter crop?
a. Wheat
b. Sugarcane
c. Groundnut
d. Millet
a. Wheat

Question 48.
Name the agricultural season that starts in June and ends in June.
Zaid

Question 49.
Differentiate food crops and cash crops.
The crops which can directly be consumed as food are called food crops. Cash crops are those having industrial and commercial significance.

Question 50.
Explain the geographical factors required for rice cultivation.
Alluvial soil is most suitable for rice cultivation. Rice requires high temperature (24°C) and a good amount of Rainfall (more than 150cm) Rice is being cultivated on regions with less rainfall with the aid of irrigation.

Question 51.
Why is it said that maize is a suitable crop for In-dia?

1. In India Maize is cultivated in both summer and winter.
2. Cultivated in regions receiving an annual average rainfall of 75cm.
3. Well drained fertile soil is ideal.

Question 52.
How are roads classified in India?
Roads in India are classified based on the con-struction and management.

Question 53.
What is Golden Quadrilateral Superhighway?
The six lane superhighways connecting the metropolitan cities in India such as Delhi, Mumbai, Chennai, Kolkata are together named as the golden quadrangle superhighway.

Question 54.
Which type of waterways are used for inland navigation?
Rivers, Backwaters, Canals, etc.

Question 55.
Which are the major inland waterways in India?

1. Godavari – Krishna rivers and itstributories
2. Buckingham canal of Andhra-Tamilnadu Region
3. Mandovi and Zuvari rivers of Goa
4. Back water of Kerala.

Question 56.
Through which mineral, the following places are known
i) Neyveli
ii) Jharia
iii) Digboy
i) Lingnite
ii) Coal
iii) Petroleum

Question 57. (Qn. Pool-2017)
Prepare a note on any three cash crops cultivated in India, its geographical requirements and the states where it is cultivated.
Cotton: Forest free growing seasons, 200 to 30°C temperature small amount of rainfall. Black soil in the best soil. Jute: Hot and humid conditions. High temperature and rainfall above 150cm is essential well-drained alluvial soil is suitable.
Sugareane: 4 tropical crop, requires hot and humid climate. Black soil and alluvial soil are ideal.

Question 58. (Qn. Pool-2017)
Presence of mineral resources has made some regions industrial centers. Substantiate this statement based on two industrial centers and the factors responsible for it.
Iron and steel industry, Aluminium industry availability of raw materials, transport facilities.

Question 59. (Qn. Pool-2017)
Write the favorable geographical factors required for the cultivation of major cash crops – cotton and jute and the states in which they are cultivated.
Cotton — Jute
1. Frost-free growing season — Hot and humid conditions
2. 20°C to 30°C temperature — High temperature
3. Black soil — Rainfall above 150cm
4. GujratMaharastra — Well drained alluvial soil

Question 60.
(Qn. Pool-2017)
Write any two mineral-based industries in India. Find out the favorable factors for their development and prepares short note.
Iron and steel industries, Aluminium industries. Availability of new materials, transport facilities, cheap power, availability of water.

Question 61. (Orukkam – 2017)
Complete the following flow chart about the major Minerals in India.

a) Ferrous metals
b) Non-ferrous metals
c) Other minerals
d) Iron ore manganese
e) Gold silver copper
f) Coal, Petroleum
g) Mica

Question 62. (Orukkam – 2017)
Complete the following table of Major Iron and Steel Industry in India.

 Iron and steel Industry Location Characteristics Tata Iron and Steel Industry Jamshedpur First public sector iron and steel company Visweswarayya Iron and Steel Ltd. Bhadravati First iron and steel plant in south India Bhilai Steel Plant Durgapur Established in collaborations with Russia in 1959 Rourkela Steel Plant Sundargarh Established in Collaboration with Germany in 1954 Durgapur Steel Plan Durgapur Established in collaboration with the UK in 1962 Bokaro steel plant Bokaro Established in collaboration with Russia in 1964

Question 63. (Orukkam- 2017)
Complete the table about the major Minerals in India, Uses, and the major state that produce these minerals.

 Minerals Uses Major producing States Gold For making jewelry Karnataka Silver For making jewelry in electroplating, photographs Rajasthan, Jharkhand, Karnataka Copper Used conductor in electrical industries Jharkhand, Rajasthan Madhyapradesh- Bauxite Ore of Aluminium used for making aircraft, electrical equipment, domestic utensils Jharkhand, Chattisgarh, Madhya Pradesh, Orissa, Andrapradesh, Rajasthan, Jharkhand, Bihar

Question 64. (Orukkam – 2017)
Classify and write the Characteristics of Mineral
Fuels
Coal:
1. The major Thermal energy source in India
2. …………………..
3. …………………..
4. …………………..
5. …………………..
Petroleum and Natural gas:
1. Main energy source of Bus, Rail and Air transport
2. ………………..
3. ………………..
4. ……………….
Non – Conventional energy source:
1. Comparatively cheap
2. …………………
3. …………………
Coal:

1. Coal is a major industrial fuel
2. Most of coal of fund in India is of medium grade of bituminous type.
3. West Bengal, Jharkhand, Odisha, Chattisgarh are the major states producing coal.
4. The largest coalfield in India is Jharia in Jharkhand.
5. The less energy-efficient coal is lignite.

Petroleum and Natural gas:

1. Other than petrol and diesel etc. numerous by-products are also obtained.
2. Petroleum mining in India started at Digboi in Assam.
3. Petroleum producing states in India are Assam Gujrat and Maharashtra.
4. Natural gas is the fuel obtained along with petroleum.

Non – Conventional energy source:

1. Environment-friendly
2. Renewable

Question 65. (Orukkam – 2017)
Classify Roads in India and list down the features. National Highways
1. Major roads of the country
2. ………………..
3. ………………..
State Highways
1. ……………..
2. …………….
3. …………….
1. ……………
2. …………..
3. …………..
1. ……………
2. …………..
3. …………..
National Highways:

1. Major roads of the country
2. Maintained and constructed by the central government
3. Links the state capitals, major cites, etc.

State Highways:

1. Major roads of the state.
2. Links state capital with the district headquarters.
3. Construction and maintenance by the government

1. Major roads in the district.
2. links district headquarters with important places with in the roads

1. Built and maintained by the district panchayath
2. Ensures the domestic movements both in the state
3. Construction and maintenance by local self-government

Question 66. (Orukkam – 2017)
List down the characteristics of Water Transport.
1. Cheapest mode of transport
2. …………………
3. …………………
4. …………………
5. …………………
2. Suitable for large scale cargo transport
3. Does not cause environmental pollution.
4. Does not cause environmental pollution.
5. Most suitable for international trade.

Question 67. (Orukkam-2017)
List down the areas where inland navigation is more
1. The rivers Ganges, Brahmaputra, and its tributaries.
2. ………………..
3. ………………..
4. ………………..
5. ………………..
2. Godavari – Krishna and their tributaries.
3. Buckingham canal of Andhra – Tamilnadu region
4. Mandovi and Zuari rivers of Goa
5. Backwaters of Kerala

Question 68. (Orukkam – 2017)
List down the major National Waterways in India

 National waterways Area through which it passes National waterway 1 Allahabad to Haldia National waterway Sadia to Dubri in the river Brahmaputra National waterway 3 The west coastal canal in. Kerala from Kollam to Kottapuram National waterway 4 Canal from Kakinada to Pondicherry linking Godavari and Krishna National waterway 5 Brahmini – Mahanadi delta river system

## Kerala Padavali Malayalam Standard 10 Solutions Unit 4 Chapter 3 Aswamedham

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## Kerala Syllabus 10th Standard Social Science Solutions Chapter 8 Kerala towards Modernity in Malayalam

Students can Download Social Science Part 1 Chapter 8 Kerala towards Modernity Questions and Answers, Summary, Notes Pdf, Activity in Malayalam Medium, Kerala Syllabus 10th Standard Social Science Solutions helps you to revise the complete Kerala State Syllabus and score more marks in your examinations.

## Kerala Syllabus 10th Standard Social Science Solutions Part 2 Chapter 4 Landscape Analysis through Maps

You can Download Landscape Analysis through Maps Questions and Answers, Summary, Activity, Notes, Kerala Syllabus 10th Standard Social Science Solutions Part 2 Chapter 4 help you to revise complete Syllabus and score more marks in your examinations.

## Kerala State Syllabus 10th Standard Social Science Solutions Part 2  Chapter 4 Landscape Analysis through Maps

### Landscape Analysis through Maps Text Book Questions And Answers

Landscape Analysis through Maps Question 1.
The following map is part of a topo sheet (Fig 4.1). Find out how it differs from the maps you are familiar with.

• It gives details about comparatively small areas.
• They are large scale maps.
• It includes both natural as well as man-made features on the earth’s surface.

Important Map Questions for Class 10 Question 2.
Look at the number 45 D/10 noted above the given topo sheet What does this indicate? Do all the topo sheets contain such numbers?
The given topo sheet is 45th sheet of a topographical map. All the topo sheets contain such number.

Question 3.
Can you explain how the topo sheet in the fig.4.1 got the number 45 D/10.
This represents that India and its adjoining places are divided into 105 sheets. Each sheet again covering 4 latitudinal and 4 longitudinal extent. 45 is such type of a sheet. This sheet again divided into 16 equal parts. It covers 1 latitudinal and 1 longitudinal extent. D is one of such type of sheet. This sheet is divided into 16 parts according to 15 minute longitudinal and latitudinal extent. That is 10.

SST Maps Class 10 Question 4.
Answer the following questions based on the figure 4.2.
a. The parts of states that are included in topo sheet number 45.
b. The Index number of topo sheets which cover the state Odisha.
c. The states that are included in topo sheet No 73.
d. The Index number of topo sheets which cover the state of Karnataka,
e. The index number of topo sheets which cover Kerala.
b. Sheet number 64,65,73,74.
c. Odisha,West Bengal,Chattisgarh and Jhark hand
d. 47,48,56,57
e. 48,49,58.

Question 5.
Find out the conventional colours used to represent information and complete the table 4.2

A → Black color
B → Blue color
C → Green color
D → Yellow color
E → White color
F → Red color
G → Brown color

Question 6.
Look at the given topo sheet (Fig 4.1). Find out the symbols and colors you have familiarized.
Cultivable land is represented by yellow color, forest, grassland etc. is represented by green color, rivers are represented by blue color, eastings, northings of their numbers are represented by red color, latitudes and longitudes are represented by black & barrier land is represented by white.

Question 7.
Haven’t you noticed the red lines drawn lengthwise and breadth wise in the given topo sheet (Fig 4.1)? What are they? What are their uses?
Eastings:

• These are north – south lines
• Their value increases towards the east.
• The value of the eastings immediately left to the geographic features is considered for identifying a location.

Northings:

• These are lines drawn in the east-west direction.
• Their value increases towards the north.
• The value of the northings immediately to the south of the feature in the map is considered for identifying a location.

Topographic Map of Kerala Question 8.
Find out the eastings and northings in the given toposheet (Fig 4.1)

• Eastings: 02 to 09
• Northings: 01 to 09

Question 9.
Locate the geographic features – fort, grave¬yard and settlements shown in the model grid using the 4-figure grid reference method.

• Fort- 8134
• graveyard – 8535
• settlement – 8534

Question 10.
Locate the smaller geographic features such as temple, church, well, light house and bridge shown in the model grid(Fig 4.9) using the 6-figure grid reference method.

• Temple – 847346
• Church-847363.
• Well-838352
• Light house – 854374

Now you have understood how the location of features is determined in topographic maps. Let’s see how the shape of the terrain is assessed.

Question 11.
Look at the smooth curved brown lines shown in the topographic map (Fig. 4.1), By what name are these lines known? What is their use?
These lines are known as contour lines. They are used to indicate the land forms such as mountains and hills.

Question 12.
Find the contour interval in the topo sheet provided (Fig.4.1).
Contour interval is 20 meters.

Question 13.
Find out the contour lines of the elevated regions in Fig 4.1 Mark their contour values on a piece of paper and identify the shape of the land form.
Method 1:
Place a paper strip across the contour pattern of which the topography is to be assessed. Mark and label the values of contour lines cutting across the paper strip.Transfer these contour values on to the X-axis of graph pa-per and choose a convenient scale and mark the contour values on y-axis as shown in Figure 2.

Method 2:
Assessing the topography by tracing the con-tour lines: Draw a line AB through the center of contours as shown in figure 1. Draw the X and Y axes below the line AB. Draw vertical lines from the point where the contours cut across AB. Mark the points at which the vertical lines intersect. Thus we get the shape of the land form represented by contours as shown in figure.

Question 14.
Plot the topography represented by the fol-lowing contour patterns (Fig. 4.20 and Fig 4.21)

Question 15.
Determine the shape of the terrain represented by the given contour and complete the table by checking the inter visibility between the place M.N.O.P.

 Places Intervisible/not Intervisible Between M and N Yes Between N and 0 No Between 0 and P Yes Between M and O No Between M and P No Between N and P No

Question 16.
The indicators regarding the marginal information of topo sheets labelled with such information are given (figure 4.25). Read the sheet based on the indicators and write down the marginal information. Marginal Information indicators

Toposheet number — (a)
Name of the place represented — (b)
Latitudinal location — (c)1, (c)2
Longitudinal location — (d)1, (d)2
Easting — (e)1, (e)2
Northing — (f)1, (f)2
Scale of the map — (g)
Contour interval — (h)
Year of survey — (i)
Year of publication — (j)
Agency in charge of survey — (k)

• Troposheet number — 56 D/11
• Name of the place represented — Karnataka (Gulbargan, Raichur)
• Latitudinal position 16° 15 ’, North to 16° 20’North
• longitudinal position — 76° 30’ East to 76° 35 East
• Eastings — 94 to 01,
• Northings 84 to 92
• Scale of the map 1:50,000,
• Contour interval 20 meters
• Year of survey — 1959 — 60
• Year of publication — 2005
• Agency in charge of survey — Dr.Parthish Nag

Question 17.
List the marginal information of the given Topography map [45 D/10] in Fig 4.1 as was done with toposheet [56 D/11].

• Toposheet Number — [45 D/10]
• Name of the place represented — Gujarat, Rajasthan(Banaskantha, Sihori districts)
• Latitudinal location — 24°30’ to 24° 35 ’
• Longitudinal Location — 72° 30’ to 72°35’
• Eastings — 02 to 09
• Northings — 01 to 09
• Scale of map 1:50,000

Question 18.
Find answers to the following questions by reading the Topo sheets (4.25) figure
1. Which is the major river flowing through this area?
2. In which direction does it flow?
3. On which bank of the river are the forests seen?
4. What is the name of the reserve forests in this area?
5. How many springs are seen in this region? locate them based on direction
6. Locate the open scrubs is this area
Find out the location of the following using 6 figure grid reference method
a. 476 A
b. 447
c. The spring north of Parampur village.

1. Major river flowing through this region is Krishna river.
2. South west to North east direction (to locate or to find out direction of a river sea symbols or signs given or by contour
3. inter val differences)
4. Right bank of the river.
5. Name of the reserve forest is Ling suguar reserve forest.
6. Two springs one is situated is North east and another is in South east.

Open scrubs are found along the right bank of the river, North east side, south westside and in the middle part.
a. 944839 → 476 A
b. 016903 → 447
c. 013852 spring North of parampur village

Question 19.
Find answers to the following questions by reading the given toposheets (4.25).
1. Identify the districts in Karnataka to which the area belongs?
2. Based on which natural features is district boundary determined?
3. Where is the metaled road seen?
4. In which direction is the Gadala mari village situated?
5. Which are the villages where post offices can be found?
6. Find the location using the 4-figure grid reference method ?
7. Aldobhavi village?
8. Ganavathala village?
9. Fort to the North-eastern corner ?
10. Using the 6-figure grid reference method, find the locations of?
11. Temple near Gadalamari village?
12. Temple within the Lingusugar reserve forest?
13. Post office in Ganavathala village?

1. Gulbarga,Raichur districts
2. Based on Krishna river
3. Raichur
4. South-east side
5. North-west side
7. Aldobhai → 0090
8. Ganavathala → 9386
9. Fort to the North eastern comer 0192.
10. Temple near Gadalamari village → 942917
11. Temple with in the lingusugaryeserved forest → 004864
12. Post office in Ganavathala Village → 937863

Question 20.
Interpret the toposheet No. 45 D/10 given in Fig.4.1 and prepare a report based on the physical and cultural features in it.
It is the map of Banaskantha, Sirohi districts of Gujarat and Rajasthan. It is surveyed in 1959 – 60, by Dr. Prithish Nag (Surveyor Gen-eral of India) Published in 2005. A lot of springs and rivers found in that region. Most of the settlements are dispersed and centra-lised settlements found in the northeast side.
Scale of the map = 1 : 50000.
Contour Interval: 20 metre.
Longitude: 72° 30 – 72° 35
Latitudes: 24° 35 -24° 30
It is between the eastings 1 to 10 and northing 0 to 10.

### Landscape Analysis through Maps Let Us Assess

Question 1.
Find out the location of settlements and grave yard in the given grid using the 4 figure grid reference method.

• 4 figure grid reference of the settlement is — 2377
• 4 figure grid reference of the grave yard is — 2277.

Question 2.
Find out the location of spring, mosque, railway station, police station and well in the given grid. Using six-figure grid reference method.

• 6 figure grid reference of Spring — 358548
• 6 figure grid reference of Mosque — 343546
• 6 figure grid reference of Railway Station — 355543
• 6 figure grid reference of Police Station — 346543
• 6 figure grid reference of well — 352549

Question 3.
Match the contour in column A with the shape of land forms in column B.

### Landscape Analysis through Maps Orukkam Questions and Answers

Question 1.
List out the important uses of topo sheets To interpret the both physical and cultural features.

• For military operations and the preparation of military maps.
• To identify and study the natural as well as cultural resources of a region as part of economic planning.
• For Urban Planning
• To know heights of the land forms.

Question 2.
Observe the picture 4.2 in the chapter and find out the toposheet with the number 58. List out the states which are represented by this toposheet.

Question 3.
Suppose a million sheet with the number 65 is given below. Divide this million sheet properly number them respectively.

Question 4.
Draw the respective signs and symbols used to represent the following features.

Question 5..
Find out the features which are represented by the following signs and symbols

1. Fort
2. Well
3. International Boundary

Question 6.
List out the methods which are used to represent heights on a toposheets.
Contour lines
Form line, Spotlight

Question 7.
Observe the model grids which are depicted in the picture 4.9 and find out the four figure grid reference and six figure grid reference of the following features as indicated below.

 Four figure grid reference Six figure grid reference Fort 8134 Temple 847855 Bridge Wen Graveyerd light house

 Four figure grid reference Six figure grid reference Fort 8134 Temple 847855 Bridge 8236 Wen 838352 Graveyerd 8534 light house 854374

Question 8.
Analyse the picture given below and find out whether the places marked are inter visible or not

 A and B are Inter visible B and C are No C and D are Inter visible D and A are No

Question 9.
Interpret to toposheet (pic 4.1) given in the chapter and complete the following table.

 Primary information Physical features Cultural features 45/10 main river Agriculture is the main occupation

 Primary information Physical features Cultural features 45/10 main river Agriculture is the main occupation 20 M, Contour Interval Spring Post offices are there in Ganavathala

### Landscape Analysis through Maps Evaluation Questions

Question 1.
The toposheets belongs to “India adjacent countries map series’ are called million sheet write the reason.
The scale of each map sheet is 1 : 1000000 in India and adjacent countries. So they are called Million sheets.

Question 2.
What does 45 D/10 on a toposheet indicate? Ans.Index number of the million sheet is 45. The million sheet numbered 45 is divided into 16 sheets from 1 .to 16. Each sheet has 15’ latitudinal and longitudinal extent. Thus the topographical map got the number 45 D/10

Question 3.
Some parts of a toposheets are seen in green color. What does the green color represent
Forest

Question 4.
Draw the appropriate conventional signs and symbols of the following features.
3. Footpath
4. Cart track

Question 5.
What does blue color on a toposheet represents?
Oceans, Rivers, Wells, Tube wells (Perennial water bodies)

Question 6.
How is the height represented on a toposheet if the actual height of an area is not available through survey as the area is inaccessible ?
When it is difficult to measure the elevation of places through land surveys due to rugged terrain, the elevation is represented with help of broken lines.These lines are Form lines.

Question 7.
Distinguish between Triangulated height and Bench Mark in a toposheet?
Triangulated height — Heights of place estimated through trigonometric surveys are recorded in in maps using symbol.

Bench mark — The height of reservoirs and prominent buildings are recorded along with the letters BM.

Question 8.
What are grids? How are they important in a toposheet?
Places are located on maps with the help of latitudes and longitudes. But it is difficult to show the precise location of minor geographical features in toposheets.To solve this difficulty north – south and east west lines in red are incorporated in the toposheets. The north-south lines are called eastings and the east-west lines are called northings. The grid formed by the eastings and the northings are called reference grid.Each grid with 2 cm width and 2 cm breadth covers an area with 1 kilometre length and 1 kilometer breadth on the earth’s surface (in 1: 50000 toposheets)

Question 9.
From the contour lines given below find out the value of the contour line which represents

400 M

Question 10.
What is intervisibility. How do we make intersibility of places in use?
If any two places are mutually visible, then we can establish that these places are inter visible. Intervisibility assessment is being applied for erecting electric posts, mobile towers, wireless communication towers etc.

Question 11.
The given below are some features on a toposheets. Catergories them an cultural features and physical features.
Road, Forest, Railway line, Rivers, Building Canal, Open Serub, Pond

 Cultural features Physical features Road Open serub Railway line Forest Building Rivers canal pond

### Landscape Analysis through Maps SCERT Questions and Answers

Question 1.
Toposheeets are maps prepared by incorpo-rating detailed information of comparatively smaller areas. What are its uses?

• Economic planning
• Urban planning
• Military operations
• Analysis of surface features of the earth

Question 2.
In the toposheet numbered 45 F/10 what does F indicate?
F indicates degree sheet

Question 3.
55 D/1 represents the number of a toposheet.
i. What is the scale of this toposheet ?
ii. What is indicated by the parts 55 and D in this toposheet number ?
i. 1 : 50,000
ii. 55 indicates the Million sheet which includes this toposheet. D indicates the Degree sheet which includes this toposheet.

Question 4.

Suppose the figure represents a 4° x 4° topographical map. Mark the position of 55 D/10 toposheet of scale 1: 50000 by dividing and numbering it in the respective order.

Question 5.
What is represented by the symbol λ in a topographical map?
Non – perennial river

Question 6.

Examine the symbol and mention the cultural features represented by this symbol in the topographical maps.
• Bridge

Question 7.

The symbols largely used in a toposheet to represent the transport are given. What is your inference regarding the transport facilities in there region?

• The symbols represent foot paths and unmetalled roads
• Thus transport facilities are limited in this region

Question 8.
Analyse the symbols and find suitable ones to each of them from those given below.

I. a. International boundary
b. State boundary
c. District boundary
d. Taluk boundary
II. a. State boundary
b. District boundary
c. Taluk boundary
d. International boundary
I. a. International boundary
b. State boundary
c. District boundary
d. Taluk boundary

Question 9.
Distinguish the features represented by conventional signs and symbols in toposheets and make inferences on them.

Observe the columns A and B and find the suitable matches from those given below.
I. 1a, 2b, 3c, 4d
II. 1a, 2c, 3b, 4d
III. 1d, 2c, 3b, 4a
IV. 1d, 2b, 3c, 4a
III. 1d,
2c,
3b,
4a

Question 10.
The Colours and symbols used in topographical maps are internationally accepted ones. Why?
This is for understanding the maps prepared by a country by any other countries

Question 11.

These two symbols represents railway lines. What is the main difference between them?

• Metre guage

Question 12.

Grave yard

Question 13.
What is represented by the signs PO and PS in topographical maps?

• PO- Post Office
• PS-Police Station

Question 14.
What is indicated by the numbers given along with the contour lines?
Altitude

Question 15.
What are the features represented by these two symbols? Name the symbols. What is the main difference between them ?

• Altitude.
• Contour lines and Form lines.
• If the altitude of places are known, contour lines are drawn by joining the places having the same altitude above mean
• sea level. If the actual elevations of places are not known, broken lines are drawn instead of contours.

Question 16.
Three fourth of the total area in a topographical map is shown in yellow color. What is your inference regarding the main economic activity of the people in this region?
Agriculture is the main economic activity

Question 17.
What are the methods of representing relief in topographical maps other than contour lines?

• Form lines
• Spot heights
• Triangulated heights
• Bench marks etc.

Question 18.
Examine the model reference grid and mark the symbol required at the place where the river and road meets.

Question 19.
The lines drawn in North-South direction in the toposheets are the Eastings. Why these lines are called so?
The value of these lines increases eastwards.

Question 20.
Observe the model reference grids. Suppose there is a proposal to construct a water reservoir in this region. Suggest the suitable place for constructing a water reservoir across the river. Substantiate your answer.

• AB is the suitable place. Cost of construct-ion will be less because it is a narrow valley between the hills.
• Can have much water holding capacity.

Question 21.
The contour lines are closely spaced at place A and B are widely spaced at plAce B in a toposheet. What is your inference regarding the slopes at places A and B?
A. Steep slope
B. Gentle slope

Question 22.
Analyse the model reference grids given. Identify the suitable place for the construction of railway line and mark it with appro priate symbol

• Mark along the area in between the hills.
• Use the conventional symbol for railway line

Question 23.
Analyse the model reference grids and answer the following questions.

1. Find the direction of fort with respect to the temple.
2. Locate the temple in six figure grid reference method.
3. Find the actual length of the road in the area.
4. Locate the settlements in four figure grid reference method.
1. West
2. 847345
3. 6.5 Km
4. 8534

### Landscape Analysis through Maps Exam Oriented Questions and Answers

Question 1.
In India which agency is entrusted with the preparation of topographic maps ?
The Survey of India

Question 2.
Name the imaginary lines joining places hav-ing the same elevation above the sea level.
Contour lines

Question 3.
Find out which is not a function of contour lines in the topographic maps.
a. To understand the height of a place
b. To understand the slope of the place,
c. To understand the pH of landform.
d To understand the shape of the landform.
To understand the pH of landform.

Question 4.
How did the word Toposheet derive?
The English term topographic is derived from the Greek terms ’topo’ and “graphic”.Topo means place and graphic means to write or explain.

Question 5.
Certain restrictions have been imposed on the Use of topographical maps why?
This is because of strategic regions owing to the national security concern.

Question 6.
What are the things that we should keep in mind while preparing or analyzing the topo-sheet?

• A thorough knowledge of the numbering scheme.
• local aspects.
• The conventional sign and symbols
• The elevation and slope of the terrain
• The methods of their representation

Question 7.
Study the figure 4.2 given in this chapter Analyze the figure 4.2. given is this chapter?
It refers to India and adjoining places covering 4° latitudinal and longitudinal extent into 105 sheets. One among the sheet is 55.This 55 sheet is again divided into 16 equal parts This sheets has 1° latitudinal and longitudinal extent. One such type of sheet is D given in this figure. This sheet again divided in to 16 parts. This consists of 15 minute latitudinal and longitudinal extent.

Question 8.
Given picture consists of various conventional symbols. What do they represent?

C. Footpath
D. Cort track
E. Bridge with road

Question 9.
What are the indications of the conventional symbols given below?

A. Railway – broad gauge
B. Railway with station
C. Railway with meter gauge
D. Level crossing
E. Railway with bridge

Question 10.
What are the Geographical features given in the picture below?

A. International boundary
B. State boundary
C. District boundary
D. Taluk boundary

Question 11.
What are the geographical featuros given below?

A. Stream
B. River
C. Tidal river
D. Spring
E. Well
F. Tube well

Question 12.
What are the methods used to represent height in topography sheets?

• Contour lines
• Form lines
• Spot height
• Triangulated height
• Bench mark

Question 13.
What are the various uses of Topgraphic maps?

• To analyse the physical and cultural features of the Earth.
• For military operations and the preparations of military maps.
• To identify and study the natural as well as the cultural resources of a region as a part of economic planning.
• For urban planning.

Question 14.
There are various methods used to represent height in topography sheet. Give a brief note on it.
Contour line — These are imaginary lines joining places having the same elevation above the sea level.

Form lines — When it is difficult to measure the elevation of places through land surveys due to rugged terrain, the elevation is represented with the help of broken lines – These are form lines.

Spot height — It represents the actual height of a place by recording the heights in digits beside a black dot.

Triangulated height — Height of places estimated through trigonometric surveys are recorded is maps using symbols.

Bench mark — The height of reservoirs and prominent buildings are recorded ‘along with the letters BM’.

Question 15.
Name the lines which are drawn both horizontally and vertically for grid reference?
Eastings and Northings are the lines used to for grid reference.

Eastings : The lines which are drawn from North – South in red color are called Eastings. Northings – The lines which are drawn from East – West in red color are called Northings

Question 16.
What is grid reference?
The grid formed by the eastings and the northings are called grid reference.

Question 17.
Write a short note on the relationship between grid reference in topography sheet and breadth on the earth surface?
Each grid with 2 cm width and 2 cm breadth covers and area with 1 km length and 1 km breadth on the earth surface (1:50,000 topo- sheet)

Question 18.
4 figures and 6 figures are used in topography sheet for grid reference. Write an explanation to this statement.
Larger geographic features are generally located through 4 figure. While comparatively smaller geographic features are located through the 6 – figure grid reference.

Question 19.
Find out the 4 figure grid reference of the taken given in the picture.

• Easting 52
• Worthing 18
• Grid reference 5218

Question 20.
One tube well is given in the figure. Find out 6 figure grid reference of the tube well.

• Easting – 155
• Northing – 766
• Grid reference – 155766

Question 21.
In a grid reference eastings is recorded as 165? What is meant by this?
1.6 is vertically drawn and marked in red colour. 5 means in between 16 and 17 imagine there are 10 equal lines,5 stands on 5th line.

Question 22.
Brown lines are shown in the topographic map. By what name are these lines known? What is its use?
Brown color lines represents contour lines.They are used to find out the altitude of the place shown in the map.

Question 23.
What are the contour lines?
Contours are imaginary lines drawn connecting places having equal elevation from the sea level. The respective altitude will be contour values.

Question 24.
What are the various uses of concur intervals in toposheet?

• To know about height of a place.
• To know about nature of slope of a place.
• Shape of the land form.

Question 25.
There are two ways to know about the shape of land forms by contour lines. What are the two ways?
Method -1: Place a paper strip, across the contour pattern of which the topography is to be assessed. Mark and label the values of the contour lines cutting across the paper strip. Transfer these values on to the x and y axis of a graph paper in picture 2. We get the shape of the land form after drawing shown in figure 3.

Method-2: Copy the contour lines on the tracing paper and transfer them on to another paper. Draw a line A B through the center of the contours as shown in figure 1. Drawn x and y axis below the line AB as shown. Join the points using pencil as again in picture 2

Question 26.
a. How is the English term Topographic formed ?
b. What are things should be considered while interpreting a Topography sheet?
c. List out various marginal/primary information to be collected from a topography sheet.
a. The English term topographic is derived from the Greek terms ‘topo’ and ‘graphie’ which mean ‘place’ and ‘to write or draw’ respectively. Topographic maps are also known as toposheets.

b. (i) Printing information
(ii) Physical features
(iii) Cultural features

c. (i) Toposheet number
(ii) Name of the place represented
(iii) Latitudinal location
(iv) Longitudinal location
(v) Eastings
(vi) Northings
(vii) Scale of the map
(viii) Contour interval
(ix) Year of survey
(x) Year of publication
(xi) Agency in charge of survey

## Kerala Syllabus 10th Standard Social Science Solutions Chapter 1 Revolutions that Influenced the World in Malayalam

Students can Download Social Science Part 1 Chapter 1 Revolutions that Influenced the World Questions and Answers, Summary, Notes Pdf, Activity in Malayalam Medium, Kerala Syllabus 10th Standard Social Science Solutions helps you to revise the complete Kerala State Syllabus and score more marks in your examinations.

## Kerala Syllabus 10th Standard Hindi Solutions Unit 2 Chapter 1 आई एम कलाम के बहाने

You can Download आई एम कलाम के बहाने Questions and Answers, Summary, Activity, Notes, Kerala Syllabus 10th Standard Hindi Solutions Unit 2 Chapter 1 help you to revise complete Syllabus and score more marks in your examinations.

## Kerala State Syllabus 10th Standard Hindi Solutions Unit 2 Chapter 1 आई एम कलाम के बहाने (फ़िल्मी लेख)

### आई एम कलाम के बहाने Text Book Activities & Answers

आई एम कलाम के बहाने विश्लेषणात्मक प्रश्न

आई एम कलामप्रश्ना 1.
‘हमारा सौदा था खेल घंटी में खाने की अदला-बदली का।’ इस तरह की अदला-बदली से हम क्या समझ सकते हैं?

उत्तर:
बच्चों के मन में हमेशा प्यार रहता है। उनके बीच ऊँच-नीच या गरीब-धनी का कोई भेद-भाव नहीं होता। वे एक दूसरे को कुछ भी देने को तैयार होते हैं। चाहे वह खाना हो या और कुछ। निरीह बच्चों के इस अदला-बदली से उनकी मानवीयता का बोधमिल जाता है।

केरल का रहन सहन प्रश्ना 2.
‘रविवार की छुट्टी का दिन उनके लिए बफ़्ते का सबसे बुरा दिन हुआ करता।’ ऐसा क्यों कहा गया है?

उत्तर:
मोरपाल स्कूल जाकर खूब पढ़ना चाहता है। बडा होकर कुछ बनने की आकांक्षाएँ उसके मन में होंगी। इसलिए स्कूली दिन उनके लिए उत्साह के दिन और रविवार छुट्टी का दिन सबसे बुरा दिन लग जाता है।

प्रश्ना 3.
‘बाकी निन्यानवे कहानियों को कभी भूलना नहीं चाहिए जो हमारे बचपनों में है। – लेखक ने ऐसा क्यों कहा है?

उत्तर:
कलाम की कहानी बस एक फिल्म की कहानी है। फिल्म में वह अपनी मंज़िन पाता भी है। . लेकिन लेखक के जीवन में हुई अन्य कहानियों का अंत दर्दनाक है। वे बच्चे अपनी मंज़िल पाये बिना बहुत कष्ट उठाकर जी रहे हैं।

आई एम प्रश्ना 4.
‘लेकिन छोटू सिर्फ छोटू होकर नहीं जीना चाहता’ – इससे आपने क्या समझा?

उत्तर:
छोटू स्कूल जाकर खूब पढ़ना चाहता है। राष्ट्रपति अब्दुलकलाम के शब्दों से प्रभावित होकर कलाम बनना चाहता है। इसलिए उसने स्वयं ही अपना नाम कलाम रखा है। अपना भविष्य उज्ज्वल बनाना चाहता है।

प्रश्ना 5.
‘लेकिन कलाम फिर कलाम है’ – लेखक के इस प्रस्ताव पर चर्चा करें।

उत्तर:
कलाम एक ईमानदार लड़का है। चोरी का आरोप लगाते समय भी वह सबकुछ सहता है। कुँवर रणविजय को सज़ा मिलने के डर से उनसे हुई दोस्ती के बारे में भी कुछ नहीं कहना। सच्ची दोस्ती यही है। दोस्ती के लिए कुरबान करने वाला ही असली दोस्त निकलता है।

### आई एम कलाम के बहाने Text Book Activities and Answers

प्रश्ना 1.
लिखें, प्रत्येक पात्र क्या करता था?

उत्तर:

प्रश्ना 2.
संबंध पहचानें, लेख से उचित शब्द चुनकर रिक्त स्थान की पूर्ति करें।

उत्तर:

प्रश्ना 3.
संबंध पहचानकर सही मिलान करें।

उत्तर:

प्रश्ना 4.
यह प्रसंग पढ़ें, मिहिर और मोरपाल के जीवन अनुभवों के आधार पर टिप्पणी लिखें।

‘जिस स्कल में बिताए समय को मैं अपने बचपन का सबसे खराब समय समझ करता था, शायद वही मोरपाल के लिए उसके जीवन का सबसे अच्छा समय होता था।’
उत्तर:
समाज के दो पहलू
मिहिर एवं मोरपाल दोस्त थे। दोस्ती इतनी घनी थी कि खाने की चीज़ भी आपस में बाँट लेते थे। मोरपाल गरीब घराने का लड़का है। उसके माँ-बाप खेत-मजूरी करते थे। घर में उसे कमर तोड़ मेहनत है। फिर भी वह रोज़ स्कूल आना पसंद करता है। पंद्रह किलोमीटर दूर किसी गाँव से रोज़ साइकिल चलाता स्कूल आता था। रोज़ छाछ का डिब्बा लेकर आता था। स्कूल आकर लेखक (मिहिर) का राजमा-चावल बडी चाव से खाता था। क्योंकि उसने पहले कभी यह देखा ही नहीं। स्कूल के प्रति उसका लगाव कुछ खास है इतना कि बिना नागा रोज़ स्कूल आता था। रविवार की छुट्टी का दिन उसके लिए हफ़्ते का सबसे बुरा दिन था। किसी शादी में भी स्कूल के नीली-खाकी यूनीफॉर्म पहनते दिखाई पड़ता था। बेचारे के पास जो कमीज़पैंट का एक ही जोड़ा था, वह नीली-खाकी यूनीफॉर्म था। मोरपाल का स्कूल आठवीं के बाद छूट जाता है। वह आज भी अपने पिता की तरह वहीं खेती-मजूरी करता है।

मिहिर पांडेय धनी परिवार का है। घर मे सारी सुविधाएँ हैं। वह स्कूल जाने से रोया करता था। रोज़ नए बहाने बनाता था। स्कूल से इतना नफ़रत करता था कि अगर स्कूल के रास्ते में पानी भर जाने के कारण स्कूल की छुट्टी हो जाए तो घर में वह नाचता रहता था। उसे स्कूल की नीली-खाकी यूनीफॉर्म से घृणा थी। उसे पहनना हमेशा टाल देता था। स्कूल में बिताए समय को वह अपने बचपन का सबसे खराब समझा जाता था। अपने राजमा-चावल के बदले मोरपाल का छाछ का डिब्बा अपना लेता था।

समाज के दो विभिन्न पहलुओं को मिहिर और मोरपाल के माध्यम से हमारे सामने पेश किया है। मोरपाल के लिए घर में कोई सुविधा नहीं है, फिर भी वह पढ़ना चाहता है। जबकि मिहिर के लिए सुविधा होते हुए भी स्कूल जाना पसंद नहीं करता। स्कूल एवं यनीफॉर्म से गहरा प्यार रखते हुए भी मोरपाल को आठवीं से स्कूल छोडना पडता है और वह पिताजी की तरह खेतीमजूरी करने को विवश होता है। मगर विशेष रुचि न रखते हुए भी मिहिर ऊँचे पद पर पहूँचता है। यहाँ सामाजिक असमता का तस्वीर खींच लिया है।

प्रश्ना 5.
पढ़ें, डायरी लिखें।
वह तय करता है कि वह अपनी चिट्ठी सीधे अपने हमनाम डॉ कलाम को दिल्ली जाकर खुद देगा। और वह अकेला ही निकल पड़ता है। रास्ते में मुश्किलें हैं। लेकिन कथा के अंत में कलाम को अपनी मंजिल मिलती है।
फ़िल्म के अंत में छोटू उर्फ कलाम का सपना साकार होता है। अपनी सफलता की बात वह अपनी डायरी में लिखता है। संभावित डायरी लिखें।

उत्तर:
20 मई 2019
आज कैसा दिन रहा ! सालों का मेरा सपना आज पूरा हुआ। मेरी खुशी का ठिकाना नहीं। स्कूल में मेरी भर्ती हुई। दोस्त रणविजय के साथ मैं भी स्कूल जा रहा हूँ। सारे लोगों ने मुझे चोर बुलाया था। उस दिन मैं कितना रोया था। मुझे लूसी मैडम से मिलने था। इसलिए सीधे दिल्ली गया था। रास्ते में कितनी मुश्किलें सहना पड़ा था। न खाना, न रहन-सहन। संयोग से हुई मुलाकात की वजह से दोस्त रणविजय एवं रिश्तेदारों को मिला। इसलिए आज स्कूल जाने का सौभाग्य प्राप्त हुआ है। आगे मन में यही वादा है खूब पढूँगा और मंज़िल तक पहुँच जाऊँगा। सीधे डॉ. कलाम से मिलूँगा और खूब बातें करेगा। गाँववालों की मदद करूँगा। काश मैं कलाम बन जाएँ.

प्रश्ना 6.
‘हम’ शब्द सर्वनाम के रूप में जाना जाता है। मगर ‘हम’ पूर्व प्रत्यय के रूप में विभिन्न प्रसंगों में विशेष प्रकार का अर्थ पैदा करता है। नीचे दिए आरेख का विश्लेषण करें, ‘हम’ से जुड़े अन्य पदों को ढूँढ़ निकालें और रिक्त स्थानों की पूर्ति करें।

उत्तर:

प्रश्ना 7.
पढ़ें,
1. वह अपनी चिट्ठी कलाम को दिल्ली जाकर खुद देगा।
2. लूसी मैडम वादा करती हैं कि वे उसे अपने साथ दिल्ली लेकर जाएँगी। रेखांकित शब्दों पर ध्यान दें।
चर्चा करें,
1. रेखांकित शब्द क्रिया के किस समय के होने की सूचना देते हैं?
2. इन वाक्यों में क्रिया की अन्विति किन शब्दों से है
उत्तर:
1. रेखांकित शब्द क्रिया के सामान्य भाविकाल की सूचना देते हैं।
2. इन वाक्यों में क्रिया की अन्विति कर्ता के साथ है। (उदा : देगा – वह, जाएँगी – वे)

प्रश्ना 8.
पढ़ें,
1. मैं स्कूल जाने में रोया करता।
2. पानी भर जाने से छुट्टी हो जाया करती।
क्रिया रूपों की विशेषता पर
चर्चा करें।,
रेखांकित क्रिया रूपों से क्रिया के होने से संबंधित कौन-सा आशय मिलता है?
उत्तर:
1. क्रिया रूप नित्यता बोधक क्रिया रूप हैं।
2. नित्य करनेवाले काम को इन क्रियारूपों से घोतित करते हैं। हमेशा मुख्य क्रिया के भूतकाल रूप के साथ ‘जाना’ क्रिया का प्रयोग करते हैं।

प्रश्ना 9.
इस प्रकार के अन्य वाक्य चुनकर लिखें ।
उत्तर:

• रोज़ नए बहाने बनाया करता ।
• पानी भर जाने से छुट्टी हो जाया करती ।
• मैं घर पर नाचा करता।
• मैं स्कूल की नीली-खाकी यूनीफॉर्म से हमेशा चिढ़ा करता ।
• उसे पहनना हमेशा टाला करता।
• रविवार की छुट्टी का दिन उनके लिए हफ़ते का सबसे बुरा दिन हुआ करता।

### आई एम कलाम के बहाने Additional Questions and Answers

प्रश्ना 1.
‘हमारा सौदा था खेल घंटी में खाने की अदला-बदली का’ । खेलघंटी के समय मिहिर और मोरपाल के बीच का संभावित वार्तालाप लिखें।
उत्तर:
मिहिर : घंटी बज गई, चलो हम कुछ खाएँ।
मोरपाल : हाँ ठीक है।
मिहिर : अरे मोरपाल, तुम्हारे पास क्या है?
मोरपाल : बस छाछ का डिब्बा।
मिहिर : हाय! वह मुझे दे दो, यह तुम लो।
मोरपाल : यह क्या है भाई?
मिहिर : अरे राजमा – चावल।
मोरपाल : राजमा – चावल ! मुझे बहुत पसंद है।
मिहिर : पहले कभी देखा नहीं क्या?
मोरपाल : नहीं तो, मैं पहली बार देख रहा हूँ।
मिहिर : पेट भर खाओ।
मोरपाल : कल भी यही लाना। तुम्हारे लिए छाछ पक्का।
मिहिर : ठीक है।

प्रश्ना 2.
स्कुल में भाषण-प्रतियोगिता चलाई गई। उसमें भाग लेते हुए कुँवर रणविजय को प्रथम स्थान प्राप्त हुआ। मान लें अगले दिन के समाचार-पत्र में प्रस्तुत घटना का रपट आ रहा है। वह रपट तैयार करें।
उत्तर:
भाषण प्रतियोगिता-कुँवर को प्रथम स्थान
जैसलमेर : कल जैसलमेर के कोसमोस हायर सेंकन्टरी स्कूल में एक भाषण प्रतियोगिता चलाई गई। ढाणी के राणा सा का बेटा कुँवर रणविजय को प्रथम स्थान प्राप्त हुआ। पुरस्कार प्राप्ति के बाद उसने कहा कि उसके दोस्त कलाम ने यह भाषण तैयार किया था। इसलिए यह पुरस्कार उसके लिए है। कुँवर की हिंदी उतनी अच्छी नहीं थी। इसलिए दोस्त ने तैयार किया था। उनके बीच की दोस्ती की अनूठी निशानी भी है यह पुरस्कार प्राप्ति। पुरस्कार वितरण स्कूल के प्रधानाध्यापक ने किया। ढाणी में कुँवर के विजय पर खुशी मनाई गई।

### आई एम कलाम के बहाने  Summary in Malayalam and Translation

आई एम कलाम के बहाने  शब्दार्थ

## Adisthana Padavali Malayalam Standard 10 Solutions Unit 3 Chapter 2 Panayam

Students can Download Adisthana Padavali Unit 3 Chapter 2 Panayam Questions and Answers, Summary, Notes Pdf, Activity, Adisthana Padavali Malayalam Standard 10 Solutions helps you to revise the complete Kerala State Syllabus and score more marks in your examinations.

## Kerala Padavali Malayalam Standard 10 Solutions Unit 5 Chapter 2 Michelangelo, Mappu

Students can Download Kerala Padavali Unit 5 Chapter 2 Michelangelo, Mappu Questions and Answers, Summary, Notes Pdf, Activity, Kerala Padavali Malayalam Standard 10 Solutions helps you to revise the complete Kerala State Syllabus and score more marks in your examinations.

## Kerala Syllabus 10th Standard Physics Solutions Chapter 2 Magnetic Effect of Electric Current

You can Download Magnetic Effect of Electric Current Questions and Answers, Summary, Activity, Notes, Kerala Syllabus 10th Standard Physics Solutions Chapter 2 help you to revise complete Syllabus and score more marks in your examinations.

## Kerala State Syllabus 10th Standard Physics Solutions Chapter 2 Magnetic Effect of Electric Current

### Magnetic Effect of Electric Current Text Book Questions And Answers

Textbook Page No. 33

Observe the depiction of magnetic fields of two types of magnets.

Magnetic Effect Question 1.
The magnetic field of which magnets are depicted?

• Bar magnet
• Soft iron core (Electromagnet)

Magnetic Effect of Electric Current Class 10 Notes Question 2.
How can you identify the direction of the magnetic fields?
The presence of the magnetic field and the polarity can be understood using a magnetic compass. The direction of the magnetic fields can also determine using the Right hand thumb rule of James Clark Maxwell. Magnetic field lines are continuous, forming closed loops without beginning or end. They go from the north pole to the south pole.

Magnetic Effect of Electric Current Question 3.
How can you find out the polarity of these magnets using a magnetic compass?
If the North end of the compass needle is j pointing toward your magnet, if it attract you have found the South pole of your j magnet. Rotate the other side of your magnet toward the compass; the South end of the compass needle will now be pointing directly to the North pole of your magnet.

Magnetic Effect of Electric Current Solutions Question 4.
What are the main differences between the magnets in the picture?
The first figure indicates the magnetic field lines of the bar magnet, second figure indites the magnetic field lines of a electromagnet.The magnetic strength magnetism of an electromagnet is temporary while magnetic strength of a bar magnet is permanent.

Textbook Page No. 35

Magnetic Effects of Electric Current Class 10 Notes Question 5.
Arrange a circuit above a pivoted magnetic needle in such a way that the part AB of the conductor is parallel and close to the magnetic needle, as shown in Fig 2.3 (a).

Switch on the circuit. Observe the direction in which the North Pole(N) of the magnetic needle deflects and complete the Table 2.1.

→ When the direction of electric current is from A to B, what will be the direction of the electron flow through it?
From B to A

→ Repeat the experiment after reversing the current and record your observations in the table.

→ Repeat the experiment keeping the conductor below the magnetic needle and record the observations in the table.

Magnetic Effect of Electric Current Class 10 Solutions Question 6.
Find out the answer for the following based on the experiment.

→ What might be the reason for the deflection of the magnetic needle?
A magnetic field is created which repels the magnetic needle. It is due to the current flow through the conductor. A magnetic field is created around a conductor when current flows through it.

→ Does the deflection depend on the direction of current?
Yes

Textbook Page No. 36

Question 7.

Is the direction of current in the circuit between A and B from A to B or from B to A?
From A to B

→ Examine whether the direction of magnetic field lines around X are in the . clockwise or anticlockwise direction by observing the North Pole of the magnetic compass.
Anticlockwise direction

Question 8.
Compare the directions of the fingers of the right hand encircling the conductor and the magnetic field lines.
According to Right Hand Thumb Rule of James Clark Maxwell holding a current carrying conductor with the right hand in such a way, that the thumb points in the direction of the current. The direction in which the other fingers encircle the conductor gives the direction of the magnetic field.

Textbook Page No. 37

Magnetic Effects of Electric Current Notes Question 9.
Are the magnetic field lines inside the coil seen in the same direction?
No

Magnetic Effect of Electricity Question 10.
What is the difference observed in the direction of magnetic field lines on reversing the current through the solenoid?
Direction of magnetic lines reversed.

Magnetic Effect of Electric Current Class 10 Question 11.
When the coil is viewed in such a way that the current is in the clockwise direction, I how are the magnetic fields marked? (Into the coil/ out from the coil)
Into the coil

Class 10 Physics Chapter 2 Question 12.
How will the magnetic field lines appear when the coil is viewed in such a way that the current is in the anticlockwise direction?
out from the coil

Textbook Page No. 38

Question 13.
Record in the science diary the various factors affecting the magnetic effect of electricity.
The strength of the magnetic field in-creases when the number of turns of the coil or current is increased.

Question 14.
Take an insulated copper wire of length not less than 1 m and make a solenoid (preferably a wire of gauge number 26)

→ It will act as a magnet when current from a cell is passed through it after inserting a soft iron core. What is this device known as?
Electromagnet

→ With the help of a magnetic compass check the specialty of the magnetism at either ends of the solenoid.
Magnetism at either ends of the solenoid are different. The needle of the magnetic compass will be attracted by the south pole and repelled by the north pole.

→ What is the change observed in the movement of the magnetic needle when the experiment is repeated after removing the soft iron core?
The strength of the magnetic field will decrease.

Question 9.
From the movements of the magnetic needle in the magnetic compass, find out the polarity of the solenoid and mark them.
When current flows through the solenoid, it behaves like a bar magnet.

→ Hold a current carrying solenoid with one end facing you. Note the direction of current at that end. Is it clockwise or anticlockwise?
When a solenoid is hold in the right hand and if the four fingers represent the direction of current flow, then the thumb represents the direction of the North pole.

→ Find out the relationship between the direction of current and the polarity.
The end of the solenoid through which current flows in the clock wise direction is the south pole and the end through which current flows in the anti clockwise direction is north pole.

Textbook Page No. 39

Question 15.
Based on the above activities, tabulate the factors affecting the strength of the magnetic field of a solenoid carrying current.

• Increase the number of turns
• Increase the strength of current flow.
• Use soft iron as the core.
• Increase the area of cross section of the solenoid.

Question 16.
Analyse and compare the ability of solenoid and bar magnet to bring changes in permanency of the magnetism, polarity and the strength of the magnetism.

 Bar magnet Solenoid 1. The magnetism is permanent 1. The magnetism is temporary 2. Permanent magnet 2. Electromagnet It act as a magnet when current passed through it 3. Weak magnetic field 3. Strong magnetic field 4. Strength cannot be changed. 4. Strength can be changed by changing the current through it or changed the number of turns. 5. Polarity is fixed and cannot be easily reversed. 5. The polarity can be reversed by changing the direction of current through it

Textbook Page No. 40

Question 17.
The figure shows a copper wire suspended between the pole pieces of a U shaped magnet, using thin conductors in such a way that the wire is perpendicular to the magnetic field and it is free to oscillate in the magnetic field.

→ Does the conductor move when the circuit is switched on? Observe in which direction it is moving.
The copper wire deflects. Conductor will move perpendicular to direction of current.

→ Repeat the experiment by changing the direction of current.
The direction of deflection of the copper wire also changes to the opposite direction.

→ Repeat the experiment by interchanging the position of the magnetic poles
When the polarity of the magnetic field is changed the deflection is in the opposite direction.

→ Aren’t the direction of the magnetic field and the direction of current mutually perpendicular in this arrangement?
Yes

Textbook Page No. 41

Question 18.
Armature is the metallic coil wound round a soft iron core so that it is free to rotate. It is fixed firmly on the axis XY. In the figure, are the forces acting on sides AB and CD in the same direction? Find out on the basis of Fleming’s Left Hand Rule and write it down.
No, AB moves forward and CD moves back wards.

→ What are the effects produced by these forces on the armature?
Forces produced are in the opposite directions. They are experiences on the different positions of same object. So it rotates.

Question 19.
Observe the structure of a loud speaker.

→ Where is the voice coil situated?
In the magnetic field

→ To which the diaphragm is connected?
It is connected with the voice coil.

→ From where current reaches to the voice coil
Current reaches from the amplifier.

→ What happens when current reaches through the voice coil
It vibrates.

### Magnetic Effect of Electric Current Let Us Assess

Question 1.
Current is passed from South to North through a conductor placed below a freely pivoted magnetic needle.
a. To which direction will the North Pole of the magnetic needle turn?
b.Which is the rule used to arrive at this inference?
c. State the rule.
d. If the current flows in the conductor in the East West direction, what do you guess about the deflection of the magnetic needle? Explain
a. Towards east

b. Ampere’s swimming rule

c. Ampere’s swimming rule
Suppose a man swims in the direction j of current flow in a conductor by looking towards a magnetic needle, the north pole deflects towards the direction of the left hand.

d. A freely suspended magnetic needle remains in the north south direction. When the current flows in the east west direction, the magnetic field produced will be in the north south direction. Magnetic needle does not deflect.

Question 2.
How can we find the polarity when current flows through a solenoid? Write the methods to increase the strength of magnetic field around a current carding solenoid?
If the direction of current flow in the end of the solenoid is in the clock wise direction. South pole is formed there . If the direction of current flow is in the anti clockwise direction, the pole formed there is North. methods to increase the magnetic strength of solenoid.

• Increase the number of turns
• Increase the intensity of current.
• Increase the area of cross section of the soft iron which is used as the core.

Question 3.
The figure shows an insulated copper wire AB made into a coil. Suppose current flows from A to B through this.

a. What will be the direction of electron flow through it?
b. Can you find out the direction of the j magnetic field around the conductor AB? State the rule that substantiates this.
c. Explain how you can find out the direction of the magnetic field inside the coil,
a. From B to A

b. The magnetic field across the conductor AB can be formed out. The direction of the magnetic field will be below the table, The rule which helps to find out this is the right hand thumb rule.
According to Right Hand Thumb Rule of James Clark Maxwell holding a current carrying conductor with the right hand in such a way, that the thumb points in the direction of the current, i The direction in which the other fingers j encircle the conductor gives the direction of the magnetic field.

c. The direction of current flow in the coil will 1 be from B to A. That is when viewed from top in the clockwise direction so the direction of magnetic field lines will be from outside to inside the coil.

Question 4.
The magnetic field around the current carrying conductor AB is depicted

Based on the Maxwell’s Right Hand Cork Screw Rule find out the direction of cur¬rent and record it.
If a right hand screw is rotated in such a wave that its tip advances along the direction of the current in the conductor, then the direction of rotation of the screw gives the direction of the magnetic field around the conductor. In figure the current flows from B to A.

Question 5.
Electricity flows through a very long solenoid. Some statements are given below related to the magnitude of the magnetic field developed. Find out the correct ones and write them down.
a. It is zero
b. It will be the same at all points
c. It gradually decreases towards the ends,
d. It gradually increases towards the ends.
It will be the same at all points

Question 6.
The direction of movement of electrons through a magnetic field is depicted. “The force felt by the electrons due to the influence of the magnetic field is into the plane of the paper”. Is this statement correct? Explain based on the Fleming’s Left Hand Rule.

Yes. Current flows on the opposite direction of electrons. According to Fleming’s Left hand rule, When the thumb, point finger and middle finger of the left hand are kept mutually perpendicular and if the point finger represents the direction of the magnetic field middle finger the direction of current then the thumb represents the direction of motion experienced on the conductor.

Question 7.
In an experiment to know the intensity of magnetic field around a current carrying coil, why is the coil kept in the North South Direction.

When the coil is kept in south north direction the magnetic field becomes free. That is when kept in south north direction the geomagnetic does not influence the experiment.

Question 8.
In the split ring commutator of a DC motor, semi circular rings are used. What is the need for this?
Tn the motor the split rings rotate, according to the armature rotation. When the position of the semiconductor rings in the split ring changes the direction of the current in the armature also change. In this way the continuous rotation of the DC motor is possible.

Question 9.
A current carrying solenoid is stretched to increase the distance between the coils. What change will occur in its magnetic field? Describe.
The magnetic intensity will decrease. The magnetic intensity decreases as the number of magnetic lines decreases through as area of 1 unit.

Question 10.
State the Motor Rule. If the directions of current in the conductor and the magnetic field are the same, in which way will the conductor move?
Principle of motor:
A freely suspended current carrying conductor when kept in a magnetic field moves when current flows through it. If the direction of current in the coil and the direction of the magnetic field are same, the conductor doesn’t move.

### Magnetic Effect of Electric Current Exam Oriented Questions and Answers

Very Short Answer Type Questions (Score 1)

Question 1.
Observe the figure. If current flows from P to Q in the conductor PQ, then find the direction of the magnetic field in ABCD?

Clockwise

Question 2.
Find the odd one in the group and write the reason.
[Voice coil, field magnet, slip rings, armature]
Voice coil. Others are parts of microphone.

Question 3.
Find out the relation and fill in the blanks.
Slip ring : AC Generator
…………. : DC Generator
Split ring commutator

Question 4.
Choose the incorrect statement related with electromagnets.
a. The magnetism is permanent
b. Strength can be changed by changing
c. The polarity can be reversed by changing the direction of current through it.
The magnetism is permanent

Question 5.
When current passes through a conductor a magnetic field is produced around it What rule helps to find the direction of magnetic field.
Right hand thumb rule

Question 6.
is a coiled conductor wound up in the shape of a spring
Solenoid

Question 7.
Which effect of electricity is made used of in a solenoid?
Magnetic effect of electricity

Very Short Answer Type Questions (Score 2)

Question 8.
a. Which are the components of an electric motor
b. Explain an armature?
a. Magnetic poles, Armature, Split rings, graphite brushes and axis
b. An armature is the will wound upon a soft iron core which is suspended such that it can rotate freely.

Question 9.
Draw the direction of magnetic flux lines around a solenoid when current flows through it. Show the direction of current flow and that of magnetic field?

Question 10.

a. Find out the polarity in A&B.
b. Which are the way to increase the magnetic strength ?
a. A – South pole
B – North pole

b. 1. Increase the number of turns
2. Increase the strength of current flow.
3. Use soft iron as the core.
4. Increase the area of cross section of the solenoid.

Question 11.
List some devices which use electromagnets.
Electric bell, MCB, ELCB, Generator & Crane

Question 12.

a The direction of current flow at one end of a solenoid is given above. Which pole of the solenoid is this,
b. What is the relationship between the direction of current flow and magnetic polarity?
a. South pole

b.The end of the solenoid through which current flows in the clock wise direction is the south pole and the end through which current flows in the anti clockwise direction is north pole.

Short Answer Type Questions (Score 3)

Question 13.

Observe the U magnet and the direction of current flow in the figure,
a Which is the direction of rotate an of the wheel?
b. Name and state the rule which is the base of this experiment?
a. Clockwise direction,

b. Fleming’s left hand rule.
When the thumb point finger and middle finger of the left hand are kept mutually perpendicular and if the point finger represents the direction of the magnetic field middle finger, the direction of current then the thumb represents the direction of motion experienced on the conductor

14. When current is passed through a conductor a magnetic field is produced. The direction of the magnetic field can be found out using the right hand thumb rule,
a State this rule.
b. Name and state another rule used for this purpose.
a. Right hand thumb rule:
Imagine you are holding a current carrying conductor with the right hand in such a way, that the thumb points in the direction of the current. The direction in which the other fingers encircle the conductor gives the direction of the magnetic field.

b. Right Hand Screw Rule:
If a right hand screw is rotated in such a way that its tip advances along the direction of the current in the conductor, then the direction of rotation of the screw gives the direction of the magnetic field around the conductor.

Question 15.
Write down the working of a moving coil loud speaker by rearranging the following in correct sequence.
a. strengthened electrical pulses are sent through the voice coil of a loudspeaker.
b. The voice coil, which is placed in the magnetic field, moves to and fro rap¬idly, in accordance with the electrical pulses.
c. The electrical pulses from a micro-phone.
d. Make the diaphragm vibrate, thereby reproducing sound
e. Electrical pulses are strengthened using an amplifier
c. The electrical pulses from a microphone.

e. Electrical pulses are strengthened using an amplifier

a. strengthened electrical pulses are sent through the voice coil of a loudspeaker

b.The voice coil, which is placed in the magnetic field, moves to and fro rapidly, in accordance with the electrical pulses.

d.Make the diaphragm vibrate, thereby reproducing sound

Short Answer Type Questions (Score 4)

Question 16.
a. Current flows towards west in a straight electric line. Find out the direction of the 1 magnetic field below and above the electrie line.
b. When the switch of the below given circuit is ON. What will be the direction of the north pole of the needle in the compass box ?

a. According to Right Hand Thumb rule, the j direction of the magnetic field above the electric line will be from south to north whereas the direction of magnetic field below the current line will be from north to douth.

Since the direction of current flows is in clockwise direction. The compass needle will be directed towards the south pole.

Question 17.
The structure of a loud speaker is given.

a. What A and B represent?
b. Explain the working of this device?