A density bottle has a marking 25 mL on it. It means that:

1. the mass of density bottle is 25 g.
2. the density bottle will store 25 mL of any liquid in it.
3. the density bottle will store 25 mL of water, but more volume of liquid denser than water.
4. the density bottle will store 25 mL of water, but more volume of a liquid lighter than water.

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.

The weight of a body is more than the buoyant force experienced by it, due to a liquid. The body will:

1. sink
2. float with its some part outside the liquid.
3. float just below the surface of liquid.
4. float with whole of its volume above the surface of liquid.

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