Physics MCQs

Page No. 59

If velocity is doubled then__________________?


amomentum increases 4 times and K.E increases 2 times


bmomentum and K.E. remain same


cmomentum increases 2 times and K.E increases constant


dmomentum increases 2 times and K.E increases 4 time



Work done by the force of friction is____________________?


aalways positive


balways negative


c positive only for small frictional force


d positive only for large frictional force


View Answer always negative

The source of geothermal energy is___________________?


adecay of radioactive element in the earth


b compression of material in the earth


cresidual lost of the earth


dall as said in A – B and C



The escape velocity of a body in gravitational field of earth is independent of__________________?


a its mass


b the angle at which it is thrown


cboth its mass and the angle at which it is thrown


dgravitational field of earth



Light on passing through a Polaroid is ___________________?


a plane polarized


bun-polarized


ccircularly polarized


delliptically polarized


View Answer plane polarized

Proton electron neutron and a particles have same momentum. Which of them have highest K.E ?


aProton


b electron


cneutron


da-particle


View Answer electron

Work done by variable force is determine by dividing____________________?


aforce into small interval


b displacement into small interval


cboth force and displacement into small intervals


dforce into small and displacement into large intervals



The average power and instantaneous power become equal if work is done at __________________?


aany rate


bat variable rate


cat uniform rate


dat high rate


View Answer at uniform rate

If a body a mass of 2 kg is raised vertically through 2m, then the work done will be _________________?


a38.2 J


b392.1 J


c 39.2 J


d3.92 J


View Answer 39.2 J

When a force is parallel to the direction of motion of the body, then work done on the body is_____________________?


azero


bminimum


cinfinity


dmaximum


View Answer maximum

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