The correct statement is:

1. The buoyant force on a body is equal to the volume of the liquid displaced by it.
2. The buoyant force on a body is equal to the volume of the body.
3. The buoyant force on a body is equal to the weight of the liquid displaced by it.
4. The buoyant force on a body is always equal to the weight of the body.

A piece of wood floats on water. The buoyant force on wood will be:

1. zero
2. more than the weight of the wood piece.
3. equal to the weight of the wood piece.
4. less than the weight of the wood piece.

Assertion (A) : In order to come to surface of water, whales fill their swim bladder with water.

Reason (R) : A body floats when the density of the body is less than the density of the liquid.

1. Both A and R are true and R is the correct explanation of A
2. Both A and R are true and R is not the correct explanation of A
3. Assertion is true but reason is false
4. Assertion is false but reason is true

Fill in the blanks:

(a) 1 kg is the mass of …………… mL of water at 4°C.

(b) Mass = density x …………… .

(c) The S.I. unit of density is …………… .

(d) Density of water is …………… kg m^-3.

(e) 1 g cm^-3 = …………… kg m^-3.

(f) The density of a body which sinks in water is …………… than 1000 kg m^-3.

(g) A body sinks in a liquid A, but floats in a liquid B. The density of liquid A is …………… than the density of liquid B.

(h) A body X sinks in water, but a body Y floats on water. The density of the body X is …………… than the density of body Y.

(i) The buoyant force experienced by a body when floating in salt-water is …………… that when floating in pure water.

(j) The weight of a body floating in a liquid is …………… .