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 hollow iron pipe is 21 cm long and its external diameter is 8 cm. If the thickness of the pipe is 1 cm and iron weighs 8 g/cm3, then the weight of the pipe is:

1. A Option A: 3.6 kg
2. B Option B: 3.696 kg
3. C Option C: 36 kg
4. D Option D: 36.9 kg

metres will be:

66 cubic centimetres of silver is drawn into a wire 1 mm in diameter. The length of the wire in

1. A Option A: 84
2. B Option B: 90
3. C Option C: 168
4. D Option D: 336

A hall is 15 m long and 12 m broad. If the sum of the areas of the floor and the ceiling is equal to the sum of the areas of four walls, the volume of the hall is:

1. A Option A: 720
2. B Option B: 900
3. C Option C: 1200
4. D Option D: 1800

A right triangle with sides 3 cm, 4 cm and 5 cm is rotated the side of 3 cm to form a cone. The volume of the cone so formed is:

1. A Option A: 12 cm3
2. B Option B: 15 cm3
3. C Option C: 16 cm3
4. D Option D: 20 cm3