# 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. Which of the following is NOT correct about Vectors addition?

[A] Vectors addition is associative
[B] Vectors addition is commutative
[C] Vectors of different natures can be added
[D] None of the above

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32. When one body is actually moving over the surface of other body, the friction is known as:

[A] Kinetic friction
[B] Limiting friction
[C] Static friction
[D] Negative friction

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33. The Newton’s third law is applicable when:

[A] bodies are at rest
[B] bodies are in motion
[C] bodies are in the air
[D] bodies are at rest or in motion

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34. Which of the following is correct about the coefficient of limiting friction between any two surfaces in contact?

[A] it is equal to twice the tangent of angle of friction
[B] it is equal to twice the sine of angle of friction
[C] it is equal to the tangent of angle of friction
[D] it is equal to the sine of angle of friction

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35. Which of the following is NOT correct about units of work:

[A] 1 joule = 107 ergs
[B] 1 kg-m = 1 joule
[C] 1 kg-m = 9.8 joule
[D] 1 joule = 1 Nm

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36. 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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37. 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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38. At sea level, what is the difference between the value of acceleration due to gravity at the poles and at the equator?

[A] No difference
[B] 9.8 cm s-2
[C] 1.80 cm s-2
[D] None of the above

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

[A] it is greater at mountains than in plains
[B] it is lesser at mountains than in plains
[C] it is equal for mountains and plains
[D] None of the above

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40. What is the value of Universal Gravitational Constant?

[A] 6.67×10-9 N–m2 kg–2
[B] 6.67×10-10 N–m2 kg–2
[C] 6.67×1011 N–m2 kg–2
[D] 6.67×10-11 N–m2 kg–2

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