Latent Heat of Fusion

Q.

The amount of heat energy required to change 1 kg of solid into liquid at its melting point is known as ______________

1. crystallisation

2. latent heat of fusion

3. latent heat of vapourisation

4. sublimation

Q.

How does a cube of ice transform itself into liquid water?

1. Temperature increases.

2. Heat is released.

3. Temperature decreases.

4. Heat is absorbed.

Q.

The amount of heat energy required to change 1 kg of solid into liquid at its melting point is known as ______________.

1. crystallisation

2. latent heat of fusion

3. latent heat of vaporisation

4. sublimation

Q.

At the melting point temperature of ice,

1. only ice is present.

2. only water is present.

3. both ice and water are present.

4. none of these is correct.

Q.

The temperature of a substance remains same during the change of state due to __________.

1. latent heat

2. loss of heat

3. less supply of heat

4. lattice energy

Q.

Why do solids melt on heating?

Q. The freezing point of a liquid is same as the ____ point of its solid form.

1. deposition
2. sublimation
3. boiling
4. melting

Q.

How does a cube of ice transform itself into liquid water?

1. Ice transforms itself into liquid water by releasing heat

2. Ice transforms itself into liquid water by absorbing heat

3. Ice transforms itself into liquid water by neither absorbing nor releasing heat

4. Ice transforms itself into liquid water by both absorbing and releasing heat

Q.

The latent heat of fusion of ice is

1. 33.5 X 10⁵ J kg^-1

2. 3.35 X 10⁵ J kg^-1

3. 33.5 X 10⁶ J kg^-1

4. 5.33 X 10⁵ J kg^-1

Q. When ice cubes are heated, the temperature when the melting point is reached.

1. remains constant
2. decreases
3. increases

Q. Which of the following factor is responsible for a change in state of matter?

1. Temperature
2. Shape
3. Volume
4. Colour

Q. Which is more effective in cooling?

1. Ice at $0^{0}C$
2. Water at ${100}^{0}C$
3. Water at $0^{0}C$
4. Ice at ${100}^{0}C$

Q. How does a cube of ice transform itself into liquid water?

1. Heat is absorbed.

2. Heat is released.

3. Temperature increases.

4. Temperature decreases.

Q. The amount of heat energy required to change 1 kg of solid into liquid at its melting point is known as_________.

1. latent heat of vaporisation
2. latent heat of fusion
3. latent heat of sublimation
4. latent heat of condensation