Question

A body weighs $40g$ in air. If its volume is $10cc$ , in water it will weigh :

• A. $30g$
• B. $40g$
• C. $50g$
• D. Data insufficient

Answer 1

The correct option is A $30g$

Loss of weight in water = bouyant force

and bouyant force = weight of water displaced by immersed volume

=$\rho$vg

=$1\times 10\times g$

=10g

Weight in water = weight in air - loss of weight in water

=40g - 10g = 30g

so option (A) is correct