Physics [1 Mark Question Answer]

Calculate the heat energy that will be released when 5.0 kg of steam at 100°C condenses to form water at 100°C. Express your answer in S.I. unit. (Specific latent heat of vaporization of steam is 2268 kj/kg.)

Name the substance which has maximum specific heat capacity.

How will rise in sea level affect population in coastal countries?

What is meant by global warming?

Name the greenhouse gases.

The specific latent heat of vaporisation of steam is 2260 J/g. Comment on this.

State the condition for the flow of heat energy from one body to another.

Give one consequence of the high specific latent heat of fusion of ice.

When 1 g of ice at 0 °C melts to form 1 g of water at 0 °C then, is the latent heat absorbed by the ice or given out by it?

What happens to the heat supplied to a substance when the heat supplied causes no change in the temperature of the substance?

Explain the meaning of the term latent heat. State its S. I. unit.

What happens to the average kinetic energy of the molecules as ice melts at 0°C?

1 kg of steam condenses to water at 100°C. How many joules of heat energy is liberated?

1 kg of water freezes to form ice at 0°C. What amount of heat is withdrawn?

If, in a central heating system, steam enters a radiation pipe at 100°C and water leaves the radiation pipe at 100°C, can this radiation pipe heat a room? Give an explanation for your answer.

Some heat is provided to a body to raise its temperature by 25°C. What will be the corresponding rise in temperature of the body as shown on the Kelvin scale?

Define calorimetry ?

Is it possible to condense the water formed, back to ice by adding ice at 0°C. Explain with reason.

An equal quantity of heat is supplied to two substances A and B. The substance A shows a greater rise in temperature. What can you say about the heat capacity of A as compared to that of B?

Name two factors on which the heat absorbed or given out by a body depends.

Name a liquid which has the highest specific heat capacity.

Give one example where high specific heat capacity of water is used as cooling purposes?

Give one example where high specific heat capacity of water is used as heat reservoir ?

If substances A and B are liquids then which one would be more useful in car radiators?
Given: Specific heat capacity’A’ 3.8 J/g /K. Specific heat capacity ‘B’ 0.4 J/g /K.

Name two factors on which the heat absorbed or given out by a body depends.

Define specific latent heat of vaporization of a substance.

Define the term calorie. How is it related to joule(the S.I. unit of heat)?

The specific latent heat of fusion of ice is 336 J g-1. Explain the meaning of its statement.

Write the approximate values of the specific latent heat of vaporization of steam.

Write the approximate values of the specific latent heat of fusion of ice.