set 2 MCQ Questions & Answers Detailed Explanation

Question : 1

There is no atmosphere on the Moon because

a) It receives light from the Sun

b) It is near to the Earth

c) It revolves around the Earth

d) The escape velocity of gas molecules on it is less than the root mean square velocity here

Question : 2

A smooth plane inclined at an angle q with the horizontal as shown in the given figure. A body starts from rest and slides down on the inclined surface. The time taken by the body to reach the bottom is

a) $√{2l}/g$

b) $√{2h}/g$

c) $1/{sinϴ}√{{2h}/g}$

d) $sinϴ√{2h}/g$

Question : 3

The time period of a pendulum

a) Depends on its length

b) Depends on the mass

c) Depends on time

d) Depends on temperature

Question : 4

Astronauts in space cannot stand erect. This is because, in space

a) Viscous forces of the atmosphere are very strong

b) There is no gravity

c) Solar wind exert an upward force

d) Atmospheric pressure is very low

Question : 5

If an object is falling from above, its weight remains

a) Same

b) Zero

c) Change

d) None of these