Saleha Pervez, Mansi Garg and, Poonam Singh Solutions for Chapter: Heat and its Transmission, Exercise 1: Self Check

Consider the following statements:

Statement I: A piece of copper and a piece of glass is heated to the same temperature when touched, thereafter, the copper piece appears hotter than the glass piece.

Statement Il: The density of copper is more than that of glass.

Which of the statement(s) given above is/are correct?

Consider the following statements:

Statement I: The boiling point of water decreases as the altitude increases.

Statement ll: The atmospheric pressure increases with altitude.

Which of the statement(s) given above is/are correct?

A hollow sphere of radius R, a hollow cube of side R and a thin circular plate of radius R made up of some materials are all heated to above room temperature. When left to cool in the room, which of them will reach the room temperature first? 

Consider the following statements:

$1$. Steam at ${100}^0$C and boiling water at ${100}^0$C contain the same amount of heat.

$2$. The latent heat of the fusion of ice equals the latent heat of the vaporization of water.

$3$. In an air-conditioner, heat is extracted from the room air at the evaporator coils and is rejected at the condenser coils.

Which of the statement(s) given above is/are correct?

Which of the following statements is correct regarding heat?

$1$. Heat is a form of energy.

$2$. A mirror can reflect heat.

$3$. Heat is electromagnetic radiation.

$4$. Heat cannot pass through the vacuum.

Select the correct answer using the codes given below:

Two bodies A and B are of the same mass and the same amount of heat is given to both of them. If the temperature of A increases more than that of B because of heat addition, then _____.

The specific heat of a gas at constant pressure is greater than the specific heat at constant volume because _____.

Consider the following statements:

1. A heat engine is a device which converts heat energy into mechanical energy.

2. A heat engine essentially consists of a source of heat at a higher temperature, working substance and sink of heat at a lower temperature.

3. In a diesel engine, a mixture of fuel vapours and air acts as the working substance.

4. The efficiency of a petrol engine is greater than the diesel engine.

Which of the statements given above is/are correct?