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


b1


c2


d-2


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


bK.E changes but momentum remain conserve


cboth momentum and K.E changes


dboth momentum and K.E remain conserve



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


d 25 m


View Answer 14 m

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


aprovide him a larger inertia


bdecreases his inertia


cdecreases his momentum


dincreases his momentum



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


achance of collision


bforce acting


cvelocity


dimpulse


View Answer impulse

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


adistance


bforce


cacceleration is zero


dboth A and B


View Answer distance

Momentum depends upon__________________?


aforce acts on the body


bmass of the body


c velocity of the body


dboth mass and velocity of the body



2nd law of motion gives the definition of________________?


aforce


bacceleration


cvelocity


dboth force and acceleration


View Answer acceleration

Newtons laws do not hold good for particles_______________?


aat rest


bmoving slowly


cmove with high velocity


dmove with velocity comparable to velocity of light



Which law of motion is also called law of inertia ?


a1st law


b2nd law


c3rd law


dall 1st, 2nd and 3rd laws


View Answer 1st law

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