mechanics (mass, force, acceleration, work, energy, momentum, velocity) - Category wise Question and Answer Practice Test with Solutions

Question : 16

The work done becomes zero if

a) force acting on the body is zero

b) displacement is zero

c) force perpendicular to the displacement

d) All of the above

Question : 17

Match the Column I and Column II.

a) A-Q; B-P; C-T; D-S; E-R

b) A-Q; B-P; C-T; D-T; E-S

c) A-P; B-Q; C-T; D-R; E-S

d) A-Q; B-P; C-T; D-R; E-S

Question : 18

SI unit of pressure is

a) pascal

b) bar

c) atmosphere

d) mm of Hg

Question : 19 [NDA]

A man is at rest in the middle of a horizontal plane of perfectly smooth surface of ice. He can move himself to the shore by making use of Newton’s

a) third law of motion

b) second law of motion

c) first law of motion

d) first, second and third laws of motion

Question : 20

There is no atmosphere on the moon because

a) escape velocity of gas molecules is greater than their root mean square velocity.

b) it is too for from the sun and has very low pressure in its outer surface.

c) it is closer to the earth and also it has the inactive inert gases in it.

d) escape velocity of gas molecules is less than their root mean square velocity.