Latent Heat of Vaporisation

Q.

During boiling of water, why thermometer does not show any rise in temperature after reaching 100 degree Celsius mark even after heat is provided?

1. Heat provided is used in making the intermolecular forces strong.

2. Heat provided is used in decreasing the pressure.

3. Heat provided is used in breaking the intermolecular forces.

4. Heat provided is used in reducing the volume of vapour.

Q.

Boiling water at 100 degree gives out more heat than an equal amount of steam at 100 degree celsius.

1. True
2. False

Q.

Latent heat of vaporization of water is equal to the latent heat of fusion of ice.

1. True

2. False

Q.

When heat is supplied by a burner to boiling water, then the temperature of the water during vaporization:

1. rises slowly.

2. rises rapidly

3. first rises and then becomes constant.

4. does not rise at all.

Q.

The latent heat of vaporization of a substance is always

1. greater than its latent heat of fusion
2. greater than its latent heat of sublimation
3. equal to its latent heat of sublimation
4. less than its latent heat of fusion

Q.

Which of the following statement is correct?

1. All substances expand on heating

2. All substances contract on cooling

3. Heat energy flows from hot body to the cold body

4. All the above

Q.

Which one is more warmer $100g$water at $100°C$ or $100g$ vapour at$100°C$?