Question

Pressure exerted by a sharp needle on a surface is

• A. more than the pressure exerted by a blunt needle
• B. less than the pressure exerted by a blunt needle
• C. equal to the pressure exerted by a blunt needle.
• D. None of these

Answer 1

The correct option is A more than the pressure exerted by a blunt needle

Pressure is the force per unit area. so, $P=F/A$

For a sharp needle, area A will be more less than that of a blunt needle (not that much sharp).

Hence, the pressure exerted by a sharp needle is more than the pressure exerted by a blunt needle.