# Physics MCQs for Competitive Exams Part 6

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Question:

A lift is supported by a cable that can support . The shortest distance in which the lift can be supported when it is descending with a speed of

Question:

A body is projected up a rough incline. The coefficient of friction is . Then the retardation of the block is

Question:

A body takes n times as much time to slide down as rough incline as it takes to slide down a smooth inclined. The coefficient of friction is

Question:

A ball of mass is thrown upward with a velocity . If air exerts an average resisting force , the velocity with which the ball returns back to the thrower is

Question:

A ball of mass strikes a wall normally with a speed of and rebounds with a speed of . The impulse of the force exerted by the wall on the ball is

Question:

A body kept on a smooth inclined plane having inclination in will remain stationary relative to the inclined plane if the plane is given a horizontal acceleration equal to

Question:

The minimum acceleration with which a fireman can slide down a rope of breaking strength two-third of his weight is

Question:

An elevator is moving vertically up with an acceleration ‘a’ . The force exerted on the floor by a passenger of mass is