set 1 MCQ Questions & Answers Detailed Explanation

Question : 1

The numerical ratio of average velocity to average speed is

a) always more than one

b) always equal to one

c) always less than one

d) equal to or less than one

Question : 2

A spherical body moves with a uniform angular velocity (w) around a circular path of radius r. Which one of the following statements is correct?

a) The body has a radial acceleration 2/5$ω^2$r directed away from the centre of the path

b) The body has no acceleration

c) The body has a radial acceleration $ω^2$r directed toward centre of path

d) The body has an acceleration $ω^2$ tangential to its path

Question : 3

A jet engine works on the principle of conservation of

a) energy

b) angular momentum

c) linear momentum

d) mass

Question : 4

A solid sphere is rotating in free space. If the radius of the sphere is increased keeping mass same which one of the following will not be affected ?

a) Moment of inertia

b) Angular momentum

c) Angular velocity

d) Rotational kinetic energy

Question : 5

A boy has four options to move a body through 3m as indicated. In which case is maximum work done?

a) Push over smooth rollers

b) Lift vertically upwards

c) Push over an inclined plane

d) Push on a plane horizontal surface

Question : 6

Swimming is possible on account of

a) third law of motion

b) second law of motion

c) first law of motion

d) Newton’s law of gravitation