Law of Motion MCQ question and answer with solution

81

Which of the following examples illustrates Newton's first law of motion?

A) When we stop pedaling, the cycle starts to slow down B) While catching a fast approaching cricket ball, the fielder slowly moves his hand backwards with the moving ball C) When a bus starts abruptly, the passengers are jerked backwards D) Rocket launching

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Answer & Solution

Answer: Option C

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82

If we move the tree branch fast then some of the leaves get detached from the tree due to-

A) Acceleration B) Velocity C) Inertia D) Impulse

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Answer & Solution

Answer: Option C

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83

The correct relation of speed, distance and time is . . . . . . . .

A) $$S = \frac{T}{D}$$ B) $$S = \frac{D}{T}$$ C) S = D × T D) S = D - T

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Answer & Solution

Answer: Option B

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84

Among which of the following is the maximum value of inertia?

A) Same size of rubber ball and stone B) Scooter and bus C) Ten rupee coins and five rupee coins D) Trains and aeroplanes

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Answer & Solution

Answer: Option D

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85

Speed of body is

A) the distance covered by a moving body in unit time B) always equal to velocity of body C) a vector quantity D) None of the above

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Answer & Solution

Answer: Option A

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86

At any moment, the acceleration of a rocket is proportional to the n^th power of the velocity of the released gases. The value of 'n' should be-

A) 1 B) 2 C) -1 D) -2

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Answer & Solution

Answer: Option A

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87

The velocity of a car increases uniformly from 18 kmhr^-1 to 72 kmhr^-1 in 10 s. Calculate the acceleration of the car.

A) 1.5 ms^-2 B) 15 ms^-2 C) 1.5 ms² D) 15 ms^-1

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Answer & Solution

Answer: Option A

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88

An athelete runs for some time before the high jump so that the inertia of the . . . . . . . . helps him take the long jump.

A) rest B) direction C) size D) speed

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Answer & Solution

Answer: Option D

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89

Statement I When a gun is fired, i.e. it placing pushes back with much less velocity than the velocity of the bullet.
Statement II Velocity of the recoiling gun is less because the gun is much heavier than bullet.
According to the Principle of conservation of momentum when the gun is fired, momentum of gun and bullet system remains constant.

A) Both the statements are individually true and statement II is the correct explanation of statement I B) Both the statements are individually true but statement II is not the correct explanation of statement I C) Statement I is true, but statement II is false D) Statement I is false, but statement II is true

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Answer & Solution

Answer: Option A

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90

The distance-time graph for the motion of an object moving with a constant speed is a

A) dot B) circle C) straight line D) curve

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Answer & Solution

Answer: Option C

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Law of Motion MCQ question and answer with solution | Physics Gk MCQs