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physics MCQs

Practise multiple-choice questions from physics for competitive examinations and subject revision. Review each marked answer and report any item that may be outdated or unclear.

physics Mcqs
1. When a body moves in a straight line then its displacement coincides with__________________?
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A. distance

B. force

C. acceleration is zero

D. both A and B

2. Which one of the following bulbs has the least resistance ?
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A. 300 watt

B. 200 watt

C. 100 watt

D. 60 watt

3. An immersion heater of 400 watts kept on for 5 hours will consume electrical power of __________________?
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A. 2KWh

B. 12KWh

C. 20KWh

D. 6KWh

4. When light incident normally on thin film the path difference depends upon ________________?
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A. all thickness nature and angle of incidence

B. nature of the film only

C. thickness of the film only

D. angle of indidence only

5. Inertia of an object is quantitative measure of its__________________?
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A. density

B. volume

C. temperature

D. mass
6. The number of beats produced per second is equal to____________________?
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A. the frequency of either of the two tuning forks

B. the ratio of the frequencies of two tuning forks

C. the difference of the frequencies of two tuning forks

D. the sum of the frequencies of two tuning forks

7. When one mirror of a Michelson Interferometer is moved a distance of 0.5 mm we observe 2000 fringes. What will be wavelength of light used ?
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A. 2000um

B. 500m

C. 5000A

D. 5000 nm

8. Three bulbs are rating 40W 60W and 100W designed to work on 220V mains. Which bulb will burn most brightly if they are connected in series across 220 V mains ?
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A. 100 W blub

B. 40 W bulb

C. 60 W blub

D. all will burn equally brightly

9. In an interference pattern______________________?
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A. bright fringes are wider than dark fringes

B. dark fringes are wider than bright fringe

C. both dark and bright fringes are of equal width

D. central fringes are brighter than the outer fringes

10. The dimension of force is____________________?
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A. MLT-2

B. ML-2T-2

C. ML2T-2

D. ML2T2

11. Which of the following is not an example of projectile motion ?
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A. bullet fired from gun

B. a base ball shot

C. a football kicked

D. a gas filled ballon
12. Motorcycle safety helmet extends the time of collision hence decreasing the________________?
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A. chance of collision

B. impulse

C. force acting

D. velocity

13. 3rd law of motion explains______________________?
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A. existence of a force

B. existence of pair of forces in nature

C. existence of two forces

D. effect of force

14. The beats frequency (sensible) for a human car is _____________________?
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A. 256Hz

B. 7 Hz

C. 42Hz

D. 262Hz

15. When collision between the bodies in a system is inelastic in nature then for system ____________________?
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A. momentum changes but K.E remain conserve

B. K.E changes but momentum remain conserve

C. both momentum and K.E changes

D. both momentum and K.E remain conserve

16. The co efficient of linear expansion is equal to__________?
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A. L?T/?L

B. ?L/L?T

C. ?L?T-?L

D. ?L = ?L?T
17. The dimension of elastic modulus is ___________________ ?
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A. ML-2T-2

B. ML-1T-2

C. MLT-2

D. ML2T-2

18. The current through a metallic conductor is due to the motion of _________________?
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A. protons

B. still under controversy

C. free electrons

D. neutrons

19. When body is in motion, ____________ always changes?
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A. its momentum

B. its position vector

C. its acceleration

D. its velocity

20. The first book of Physics was written by__________?
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A. Newton

B. Kelvin

C. Faraday

D. Aristotle