Kerala SSLC Physics Model Question Paper Set 5 English Medium

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Kerala SSLC Physics Model Question Paper Set 5 English Medium

General Instructions:

1. The first 15 minutes is the cool off time. You may – use the time to read and plan your answers.
2. Answer the questions only after reading the instructions and questions thoroughly.
3. Questions with marks series 1, 2, 3 and 4 are categorized as sections A, B, C and D respectively.
4. Five questions are given in each section. Answer any four from each section.
5. Answer each question by keeping the time.

Time: 1½ Hours
Total Score: 40 Marks

Section – A

Answer any four questions. Each question carries 1 score. [4 × 1 = 4]

Question 1.
Fill suitably
Generator → Armature → Induced e.m.f
Microphone → _____ → Induced e.m.f
Answer:
Voice coil

Question 2.
Name two solar devices.
Answer:
Solar panel, Solar cooker.

Question 3.
Give any one factor that influences the direction of motion of a current carrying conductor in a magnetic field.
Answer:
Direction of electric current / Direction of magnetic field.

Question 4.
Which effect of electric current is made used in safety fuse?
Answer:
Heating effect.

Question 5.
What is the critical angle of glass?
answer:
42°

Section – B

Answer any 4 questions. Each question carries 2 score. [4 × 2 = 8]

Question 6.
Give two practical applications of total internal reflection.
Answer:

1. In medical field – Endoscope
2. In field of Tele communication – Optical fibre cables

Question 7.
a) What is refraction?
b) What is the reason for refraction?
Answer:
a) When a ray of light entering obliquely from one medium to another, its path undergoes a deviation at the surface of separation,
b) Refraction is due to the difference in the optical densities of different media.

Question 8.
The statements given below are related to a step down transformer. Tabulate them as those related to primary and secondary.
i) Winding with thick wire.
ii) Current flowing at higher voltage
iii) Winding with thin wire
iv) current flowing at a low voltage.
Answer:
Primary:

• Winding with thin wire
• Current flowing at higher voltage

Secondary:

• Winding with thick wire
• Current flowing at low voltage.

Question 9.
A child sitting at the back bench of a classroom is unable to see the letters on the board clearly. What is the defect of the eye of the child? How can it be remedied? Draw its ray diagram.
Answer:
Nearsightedness.
This can be overcome by using concave lens of suitable focal length.

Question 10.
Why is hydrogen not used as a domestic fuel?
Answer:
Hydrogen is highly inflammable and explosive. It is difficult to be stored and transported.

Section – C

Answer any 4 questions. Each question carries 3 score. [4 × 3 = 12]

Question 11.
Classify the energy from the following sources as green energy and brown energy. Solar cells, atomic reactor, tidal energy, hydroelectric power, diesel energies, windmills, thermal power.
Answer:

Green energy	Brown energy
Solar cells	Atomic reactors
Tidal energy	Diesel engines
Hydro electric power	Thermal power station
Windmills

Question 12.
Observe the circuit diagram given below and answer the following questions.

a) Which are the instruments labelled 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 references to Joule’s Law.
Answer:
a) P – Rheostat
Q – Ammeter

b) i) Reading will decrease. Due to high resistance current decreases
ii) Because of Nichrome’s high resistance the current in the circuit will decrease.
According to Joules law H = I²Rt, decrease in the amount of current will reduce the amount of heat.

Question 13.
Roshan observed a beautiful rainbow in the western Sky from his school ground.
a) When did Roshan observe the rainbow? [Morning, Noon, Evening, Prediction of time is impossible]
b) Draw the diagram of dispersion taking place in a water droplet during the formation of a rainbow.
Answer:
a) Morning.
b)

Question 14.
Observe the picture and answer the questions.

a) What happens to the air column around the paper core when the voice coil vibrates?
b) Is the voice coil vibrates if d.c. reaches the voice coil?
c) What is the working principle?
d) Mention the energy change taking place.
Answer:
a) Air column also vibrates. As a result sound is produced.
b) No. Because there is no flux change occurs.
c) Motor principle
d) Electrical energy sound energy

Question 15.
Wrap a rubber ball of diameter 12 cm completely with an aluminium foil and make the surfaces smooth. Where will be the image of an object kept 12 cm away from the centre of the ball? Is the image real or virtual?
Answer:
Diameter = 12 cm. R = 6 cm

Section – D

Answer any 4 questions. Each question carries 4 score. [4 × 4 = 16]

Question 16.
A motor cyclist observes a car coming from behind with a magnification 1/6. If the actual distance between the car and the bike is 30 m calculate the radius of curvature of the mirror.
Answer:

Question 17.
Observe the circuit A and B shown below:

a) If current through 40 W bulb in the circuit A is 0.6 A What is the current through 100 W bulb in the same circuit.
b) Which among the above two circuit is suitable for house hold connection?
c) What are the advantages of using above circuit for house hold electric connection?
Answer:
a) 0.6 A
b) Parallel connection.
c)

• Bulbs can be controlled individually, using switches.
• All the appliances works as per the power marked on them.
• The same voltage is available for all the bulbs.
• Total resistance decreases.

Question 18.
a) A bulb of power 40 W is designed to operate at 240 V. Calculate resistance of the filament in the bulb.
b) What are the characteristics required for the material chosen for making filament of incandescent lamp?
Answer:
a) V = 240 V
P = 40 W
R = ?

b)

1. High resistance
2. High melting point
3. High ductility
4. Ability to emit white light in the white hot condition.

Question 19.
Blue colour of sky is due to the phenomenon of scattering
a) What is meant by scattering
b) How is Tyndal effect related to above phenomenon?
c) What are the advantage of using infrared photography?
d) In which colour does sky appear when viewed from moon?
Answer:
a) Irregular and partial reflection of light is scattering.
b) When rays of light pass through a colloidal fluid or suspension, the tiny particles get illuminated due to scattering. Because of this, the path of light is made visible. This phenomenon is Tyndat effect.
c) To take clear photographs of distant objects.
d) The sky is seen dark.

Question 20.
Primary of a transformer has 20,000 turns and the secondary has 30,000 turns. 160 V AC is applied at the primary of the transformer?
a) What is the voltage available at secondary of the above transformer?
b) If the number of turns in the secondary transformer is greater than that in the primary then more voltage is induced in the secondary. Why?
c) How much power must be supplied to the primary of the transformer so that 500 W power is obtained from secondary?
Answer:
a) N_p = 20000
N_s = 30000
V_p = 160 V
V_s = ?

b) Induced emf is directly proportional to number of turns.
c) 500 W