Practicing Physics Question Paper Class 10 Kerala Syllabus Set 5 English Medium helps identify strengths and weaknesses in a subject.
Physics Class 10 Kerala Syllabus Model Question Paper Set 5
General Instructions:
- The first 15 minutes is the cool off time. You may – use the time to read and plan your answers.
- Answer the questions only after reading the instructions and questions thoroughly.
- Questions with marks series 1, 2, 3 and 4 are categorized as sections A, B, C and D respectively.
- Five questions are given in each section. Answer any four from each section.
- Answer each question by keeping the time.
Time: 1½ Hours
Total Score: 40 Marks
Section – A
I. Answer any FOUR questions from 1 to 5. Each question carries 1 score. [4 x 1 = 4]
Question 1.
Using the relation in the first pair complete the second pair.
Electric heater: Heating effect
Washing machine : ……………….
Answer:
Mechanical effect
Question 2.
Which of the following medium has lower optical density?
(diamond, kerosene, Air)
Answer:
Air
Question 3.
Which is the incorrect statement about diamond?
a) High refrective index.
b) Velocity of light is more.
c) The optical density is more.
d) More possibility to occur total internal reflection.
Answer:
The velocity of light is more.
Question 4.
Which part of eye that can be transplanted for donation?
answer:
Cornea
Question 5.
Using the relation in the first pair, complete the second pair.
Colour of setting sun: scattering
Rainbow:……
Answer:
Dispersion
II. Answer any FOUR questions from 6 to 10. Each question carries 2 score. (4 × 2 = 8)
Question 6.
The invention of electric motor made revolutionary developments
a Which principle is behind the working of this?
b. What is the energy transformation?
Answer:
(a) Motor principle
(b) Electrical energy – Mechanical energy
Question 7.
Correct the underlined part of the sentences if there is any error.
a. In India electricity is produced at 230 V in power stations.
b. Main fuse is connected between main switch and MCB distribution board.
Answer:
(a) 11000 V
(b) ELCB
Question 8.
What are the features of images formed on the following devices?
a. Rear view mirror
b. Shaving.mirror
Answer:
(a) Erect, small and virtual
(b) Erect, magnified and virtual
Question 9.
a. Which is the important problem facing when electric power transmitted to distant places?
b. How this will overcome?
Answer:
a) Energy loss in the form of heat
(b) It is rectified by using transformers to increase voltage
Question 10.
Write two properties that a good fuel must have?
Answer:
(i) Should have high calorific value
(ii) Should cause minimum atmospheric pollution on combustion
III. Answer any FOUR question from 11 to 15. Each question carries 3 score. (4 × 3 = 12)
Question 11.
10000 J heat produced when current passes through an electric heating device for 5 minutes. Device works on 120 V supply.
a. What will be the resistance of this device?
b. Find the quantity of electric charge passed through this device.
Answer:
H = 10000J, V = 120 V, t = 5 × 60s
(a) H = \(\frac{v^2}{R}\) × t
∴ R = \(\frac{V^2 \times t}{H}\)
R = \(\frac{120 \times 120 \times 5 \times 80}{10000}\) = 432
(b) l = \(\frac { V }{ R }\) = \(\frac { 120 }{ 432 }\)A
Q = It
= \(\frac { 120 }{ 432 }\) × 5 × 60 = 83.33C
Question 12.
Select the correct option from the box about the statements of moving coil loudspeaker.
a. The part electrical pulses are passing.
b. The part which provide magnetic field for working.
c. The part producing sound by vibrating.
Diaphragm, Amplifier, Voice coil, Field magnet
Answer:
(a) voice coil
(b) Field magnet
(c) Diaphragm
Question 13.
Complete the ray diagram and write the position of image and its featuers.
Answer:
Image is formed beyond 2F
inverted, real and magnified image
Question 14.
Dispersion of light caused by the water droplets in the atmosphere causes rainbow.
a. What are the phenomena does a ray of light undergo when it passes through a water droplet?
b. In which horizon does the rainbow formed when it is formed in morning? In which shape it seen?
c. When will rainbow seen as a circle?
Answer:
(a) Two times refraction and a total internal reflection
(b) west, in the shape of are
(c) when observed from aeroplane
Question 15.
When composite light passes through a glass prism, it undergoes dispersion.
a. What difference in different rays lead to dispersion?
b. What colour is seen nearer to the base of prism after dispersion?
c. Which phenomenon of light leads to dispersion of light?
Answer:
(a) Difference in wavelength
(b) Violet
(c) Refraction
IV. Answer any FOUR questions from 16 to 20. Each question carries 4 score. (4 × 4 = 16)
Question 16.
Two resistors of resistances 4 Ω and 2 Ω connected parallel to a 6 V battery.
a. What will be the effective resistance of circuit?
b. What will be the voltage obtained to 4 Ω resistor?
c. Calculate the current passing through 2 Ω resistor?
d. How much heat will be developed on 4 Ω resistor if current passing through the circuit in 5 minutes?
Answer:
R = 4Ω R = 2 Ω, v = 6V
(a) \(\frac { 1 }{ R }\) = \(\frac{1}{R_1}\) + \(\frac{1}{R_2}\)
R = \(\frac{R_1 R_2}{R_1+R_2}\) = \(\frac{4 \times 2}{4+2}\) = \(\frac{4 \times 2}{6}\) = 1.33
(b) 6V
(c) l = \(\frac { V }{ R }\) = \(\frac { e }{ 2 }\) = 3A
(d) H = \(\frac{v^2}{R}\) × t = \(\frac{6 \times 6}{4}\) × 5 × 60 = 2700 J
Question 17.
a. Which device is used to control current in a circuit without the loss of power?
b. Which phenomenon is making use in this device?
c. Is this device used in DC circuits? Why?
d If resistors are used instead of these devices, what will be the disadvantage?
Answer:
(a) Inductors
(b) Self induction
(c) No. Inductors are coils used to oppose the changes in electric current in a circuit. Changes in the flow of current is the basis of their working. So in DC, which do not have change in current, inductors do not work.
(d) Energy lost in the form of heat.
Question 18.
The magnification of an image formed by a mirror is -1.
a. Which type of mirror is this?
b. Where will be the position of object in this image formation? Where will be the position of image?
c. When will the magnification is positive by using this mirror?
d. Write any two used of this mirror.
Answer:
(a) concave mirror,
(b) object at C , image at C
(c) When the position of object between F and P.
(d) (i) Make up mirror
(ii) Head mirror
Question 19.
Find the reason for the following
a. Red light is used as signal lamps to indicate danger.
b. Blue colour of ocean having high depth.
C. A torch rotated rapidly appears as an illuminated circle.
d The colour seen on the inner edge of rainbow is violet.
Answer:
(a) Red has more wavelength so it travel more distance without undergoing scattering.
(b) Light undergo scattering on water surface. Least wavelength blue part undergo more scattering. Due to the reflection of more scattered light it appear in blue colour.
(c) Presistence of vision of eye. Light from the torch combine together and become in circules shape. Because within \(\frac { 1 }{ 16 }\)second more images are formed. The combined result of this is appeared as circle.
(d) Violet has least wavelength. Therefore when occuring re- fraction and total internal reflection, the deviation is more. It appeared on the outer edge due to it undergo more deviation.
Question 20.
Match the items in the table in proper order.
| Non renewable sources of energy (1) | Natural gas (a) | Lignite (p) |
| Ocean thermal energy (2) | Carbon (b) | Methane (q) |
| Fossil fuel (3) | Brown energy (c) | Ammonia (r) |
| Coal (4) | Difference in temperature(d) | Nuclear energy (s) |
Answer:
1 – c – s
2 – d – r
3 – a – q
4 – b – p