Question

Non-contact forces are involved in:

i) Falling downward of raindrops from clouds.
ii) Hitting a cricket ball.
iii) Attraction of paper pieces by a used comb.
iv) Rubbing sandpaper against a surface.

• A. i, ii and iii
  
• B. ii, iii and iv
  
• C. i and ii
  
• D. i and iii
  

Answer 1

The correct option is D i and iii


Raindrops fall from clouds due to gravity.
Hitting a cricket ball is an example of muscular force.
Attraction of paper pieces by a used comb is an example of electrostatic force.
In rubbing a sandpaper against a surface, frictional force acts.
Gravitational and electrostatic forces are non-contact forces.

Hence in (i) and (iii) non-contact forces are involved.