Work, Energy and Power MCQ question and answer with solution

91

Assertion (A): A man standing on a completely frictionless surface can propel himself by whistling.
Reason (R): If no external force acts on a system, its momentum cannot change.

A) Both (A) and (R) are true and (R) is the correct explanation of (A) B) Both (A) and (R) are true, but (R) is not the correct explanation of (A) C) (A) is true, but (R) is false D) (A) is false, but (R) is true

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Answer & Solution

Answer: Option B

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92

Which of the following objects will have potential energy?

A) Moving bullet B) Flowing air C) A rolling stone D) Raised hammer

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Answer: Option D

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93

What will be the value of the kinetic energy of an object moving along the mass of 'm' if its speed is changed from 'v' to '2v' ?

A) $$\frac{{{E_k}}}{2}$$ B) 4E_k C) there will be no change in E_k D) 2E_k

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Answer: Option B

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94

If force (F) and acceleration (a) are given, then the formula for finding the mass (m) of an object is . . . . . . . .

A) F - a B) $$\frac{F}{a}$$ C) F × a D) $$\frac{a}{F}$$

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Answer & Solution

Answer: Option B

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95

A moving car faces the wind in the opposite direction. What will be the work done by the wind on the car?

A) Negative B) Zero C) Infinite D) Positive

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Answer & Solution

Answer: Option A

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96

What is the change in the total energy of a body falling freely towards the earth?

A) Does not change B) Initially there will be decrease and after there will be increase C) It will increase D) It will decrease

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Answer & Solution

Answer: Option A

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97

Work can only be done when . . . . . . . . is present.

A) Energy B) Force C) Momentum D) Power

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Answer & Solution

Answer: Option A

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98

The kinetic energy of an object of mass 10kg moving at a speed of 6ms^-1 is-

A) 18J B) 180J C) 1.80J D) 360J

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Answer & Solution

Answer: Option B

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99

When you stretched a rubber band, the energy stored in it?

A) Potential energy B) Muscular energy C) Mechanical energy D) Kinetic energy

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Answer & Solution

Answer: Option A

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100

A boy raises a box with a weight of 120 N through a height of 2 m. The work done by the boy is-

A) 60 J B) 120 J C) 240 J D) 180 J

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Answer & Solution

Answer: Option C

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Work, Energy and Power MCQ question and answer with solution | Physics Gk MCQs