General Science - Physics MCQs

Physics Objective (Multiple Choice) General Knowledge & General Science Questions & Answers for SSC-CGL, UPPSC, UPSC, NDA, CDS and UPSC Civil Services Prelims Examinations.

31. What will be the work done in holding a 25 kg iron plate for 25 seconds?

[A] 25 j
[B] 1 j
[C] 0
[D] 625 j

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32. What is the coefficient of restitution for a perfectly elastic collision?

[A] 0
[B] 1
[C] -1
[D] 100

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33. What is the effect on velocities of the two bodies of equal masses when they undergo elastic collision in one dimension?

[A] remains same
[B] gets interchanged
[C] becomes twice of the original velocity
[D] becomes half of the original velocity

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34. What happens to the velocity of a light body when it undergoes an elastic collision in one dimension with a very heavy body at rest?

[A] its velocity becomes twice
[B] it rebounds with twice of its own velocity
[C] it rebounds with its own velocity
[D] it stops and comes to rest

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35. Which of the following is true about universal gravitational constant in the case of two bodies each of unit mass having their centres placed at unit distance apart?

[A] It is equal to the force of attraction between them
[B] It is equal to twice the force of attraction between them
[C] It is equal to half the force of attraction between them
[D] It is equal to ten times the force of attraction between them

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36. Which of the following represents the dimensional formula of Universal Gravitational Constant?

[A] M1 L2 T-2
[B] M-1 L1 T-2
[C] M-1 L3 T-2
[D] M1 L3 T-2

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37. Which of the following is incorrect:

[A] Gravitational force of attraction is independent of nature of intervening medium
[B] Gravitational forces are central forces
[C] Gravitational forces are non-conservative forces
[D] All of the above

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38. Which of the following is correct about acceleration due to gravity?

[A] it increases with depth
[B] it decreases with depth
[C] it is independent of depth
[D] None of the above

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39. What will be the effect on the value of acceleration due to gravity at the poles if the rate of rotation of earth increases?

[A] No effect
[B] it will increase
[C] it will decrease
[D] it will become zero

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40. Which of the following has an effect on the value of acceleration due to gravity?

[A] Shape of the earth
[B] Height above the earth surface
[C] Axial rotation of the earth
[D] All of the above

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