Physics MCQs

Page No. 71

The acceleration in the rocket at any instant is proportional to the nth power of the velocity of the expelled gases. Where the value of n must be ?


a-1

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b1

✓


c2

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d-2

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View Answer 1

When collision between the bodies in a system is inelastic in nature then for system ____________________?


amomentum changes but K.E remain conserve

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bK.E changes but momentum remain conserve

✓


cboth momentum and K.E changes

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dboth momentum and K.E remain conserve

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A body is falling freely under gravity. How much distance it falls during an interval of time between 1st and 2nd seconds of its motion, taking g=10 ?


a14 m

✓


b20 m

✖


c5 m

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d 25 m

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View Answer 14 m

During long jump, athlete runs before taking the jump. By doing so he__________________?


aprovide him a larger inertia

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bdecreases his inertia

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cdecreases his momentum

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dincreases his momentum

✓



Motorcycle safety helmet extends the time of collision hence decreasing the________________?


achance of collision

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bforce acting

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cvelocity

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dimpulse

✓


View Answer impulse

When a body moves in a straight line then its displacement coincides with__________________?


adistance

✓


bforce

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cacceleration is zero

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dboth A and B

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View Answer distance

Momentum depends upon__________________?


aforce acts on the body

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bmass of the body

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c velocity of the body

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dboth mass and velocity of the body

✓



2nd law of motion gives the definition of________________?


aforce

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bacceleration

✓


cvelocity

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dboth force and acceleration

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View Answer acceleration

Newtons laws do not hold good for particles_______________?


aat rest

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bmoving slowly

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cmove with high velocity

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dmove with velocity comparable to velocity of light

✓



Which law of motion is also called law of inertia ?


a1st law

✓


b2nd law

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c3rd law

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dall 1st, 2nd and 3rd laws

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View Answer 1st law

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