set 1 MCQ Questions & Answers Detailed Explanation

Question : 1

Light year is

a) the distance travelled by light in free space in one year.

b) time taken by light to travel from sun to earth.

c) light emitted by the sun in one year.

d) time taken by earth to go once around the sun.

Question : 2

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 : 3

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 : 4

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 : 5

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

Question : 6

Which of the following is not a vector quantity?

a) Force

b) Velocity

c) Displacement

d) Volume