physics MCQs – Page 2

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 Review each marked answer and report any item that may be outdated or unclear.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
21. Taking off rocket can be explained by __________________?
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A. law of conservation of energy

B. Law of conservation of momentum

C. 2nd law of motion

D. 1st law of motion

22. Which one of the following cannot be polarized ?
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A. radio waves

B. X-rays

C. ultraviolot rays

D. sound waves
23. Which one is the best material for making connecting wires ?
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A. silver

B. iron

C. tungsten

D. copper
24. The formula of inter-conversion of centigrade and Fahrenheit scale is___________?
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A. none

B. f -32/9 =c/5

C. c-32/9

D. f-32/9=c/9

25. The speed of stationary waves in a stretched string are independent of___________________?
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A. Number of loops

B. Tension in the string

C. Point where string is plucked

D. both A and C
26. Resistance of a conductor depends upon_________________?
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A. all of above

B. nature of conductor

C. dimension of conductor

D. physical state of the conductor

27. Study of living science relates with________?
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A. Physical science

B. Organ science

C. Just living science

D. Biological science
28. Which law of motion is also called law of inertia ?
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A. 2nd law

B. 1st law

C. all 1st, 2nd and 3rd laws

D. 3rd law

29. Why should a resistance be introduced in a circuit in series deliberately ?
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A. just to give a good look to circuit

B. to increase current

C. to decrease current

D. to control current

30. The range of the projectile at 30 deg and 60 deg are__________________?
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A. equal to 90 deg

B. equal to 45 deg

C. none of the above

D. equal to each other
31. Waves produced at the surface of water by a pencil executing vibrating motion if held vertically at a frequency of 50Hz are__________________?
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A. Longitudinal

B. Transverse

C. Periodic

D. both A and C
32. Which branch of science plays an important role in engineering?
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A. Chemistry

B. Physics

C. Biology

D. All of these

33. Instantaneous and average velocities become equal when body___________________?
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A. moves in a circle

B. has uniform acceleration

C. has variable acceleration

D. has zero acceleration
34. The velocity of light was determined accurately by_______________?
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A. Newton

B. Young

C. Michelson

D. Huygen

35. Why Ballistic missile fails in some circumstances of precision ?
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A. all of these

B. due to their shape

C. due to air resistance

D. due to angle of projection

36. Three equal resistors connected in series with a source of e m f together dissipate 10 W of power each. What will be the power dissipated if the same resistors are connected in parallel across the same source of e m f ?
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A. 100W

B. 40 W

C. 90W

D. 120W

37. The collision between two bodies be elastic if bodies are_________________?
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A. soft and elastic

B. solid and hard

C. hard and elastic

D. solid and soft

38. The velocity of sound in air would become double than its velocity at 0C at temperature ?
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A. 1172C

B. 586C

C. 313C

D. 819C
39. Which one of the following is massless?
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A. Neutron

B. Photon

C. Electron

D. Proton

40. Thermocouples convert___________________?
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A. heat energy into light energy

B. heat energy into mechanical energy

C. heat energy into electrical energy

D. mechanical energy into heat energy