Latent Heat of Vapourisation and Fusion

Q.

What is the latent heat of vaporization?

Q.

What is the Latent heat of ice?

Q.

Is condensation latent heat?

Q.

The amount of heat required to convert unit mass of liquid into its vapour state without a change in its temperature called is latent heat of ___

Q.

Identify the substance that is more effective in cooling.

1. Water at 0°C

2. Water at 100°C

3. Ice at 0°C

4. Steam at 100°C

Q.

What is Latent Heat?

Q.

Give reasons for the following.

Heat supplied/released during a change of state is called latent heat.

Q.

On suffering from fever which will lower down your body temperature, more ice or ice cold water and why?

Q.

Latent heat of fusion of ice is………..

Q.

How will you explain the following observation: Ice at 273 K is more effective in cooling than water at 273 K.

Q.

The weather becomes very pleasant in cold countries when rivers and lakes start melting. Explain as clearly as possible.

Q.

Define latent heat of evaporation.

Q. The amount of heat required to convert unit mass of liquid into its vapour state without a change in its temperature called:

1. latent heat of vaporization.
2. latent heat of fusion.
3. latent heat of condensation.
4. latent heat of water.

Q. A piece of ice of mass $40g$ is added to $200g$ of water at ${50}^{o}C$. Calculate the final temperature of water when all the ice has melted. Specific heat capacity of water $=4200Jk{g}^{-1}{K}^{-1}$ and specific latent heat of fusion of ice $=336\times {10}^{3}Jk{g}^{-1}$

1. ${28.67}^{o}C$
2. ${21.67}^{o}C$
3. ${28.33}^{o}C$
4. ${21.33}^{o}C$

Q. Which of the following statements are correct for latent heat?

1. Latent heat of fusion is the energy absorbed during melting.
2. Latent heat of vaporization is the energy absorbed during boiling.
3. Latent heat of fusion is the energy absorbed during boiling.
4. Latent heat of vaporization is the energy absorbed during melting.

Q.

Identify the substance that is more effective in cooling.

1. Water at 0°C

2. Water at 100°C

3. Ice at 0°C

4. Steam at 100°C

Q.

Give one word or term for the following descriptions:

The amount of heat required to change $1kg$of a solid into a liquid state.

Q.

Heat energy required to melt $10kg$ ice at its melting point will be _____. (The latent heat of fusion of water = $333.55kJk{g}^{-1}$).

1. $4.33\times {10}^{5}J$

2. $4.33\times {10}^{4}J$

3. $2.33\times {10}^{6}J$

4. $3.33\times {10}^{6}J$

Q.

Which of the following processes do not use the concept of Latent heat?

1. Melting of ice
2. Boiling of oil
3. Freezing of nitrogen gas
4. Burning of plastic

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 decreasing the pressure.

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

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

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

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

1. latent heat
2. sensible heat
3. less supply of heat
4. direct heat