1.  A boat having a length 3 m and breadth 2 m is floating on a lake. The boat sinks by 1 cm when a man gets on it. The mass of the man is:
A. 12 kg
B. 60 kg
C. 72 kg
D. 96 kg

Answer: Option B

Explanation:

Volume of water displaced = (3 x 2 x 0.01) m3
= 0.06 m3.

Mass of man

= Volume of water displaced x Density of water
= (0.06 x 1000) kg
= 60 kg.