Give two examples from everyday life which show that air exerts pressure.

What is muscular force ? Give one example of muscular force.

Which of the following are non-contact forces ?

Magnetic force, Frictional force, Gravitational force, Muscular force, Electrostatic force.

What is a rubber sucker? How does it work? State any one use of a rubber sucker.

Why do mountaineers usually suffer from nose-bleeding at high altitudes ?