Heat Flow

Q.

Which of the following statement is correct?

1. All the above

2. All substances expand on heating

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

4. All substances contract on cooling

Q. Suppose a body A at a higher temperature is brought into contact with another body B at a lower temperature, then which among the following are true?

1. Molecules of body A becomes less active.
2. The heat flow is from body A to body B.
3. Molecules of body A becomes more active.
4. The heat flow is from body B to body A.

Q.

What is hotness of a body?

1. It is an absolute value

2. It is a relative value

3. It depends on the scale of the temperature used

4. It cannot be measured

Q. Two objects A and B of the same temperature are connected through a pipe. The system is said to be in thermal equilibrium, since there is no heat transfer between them.

1. True

2. False

Q.

Which of the following statement is correct?

1. All substances expand on heating

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

3. All substances contract on cooling

4. Metals do not contract when heat is removed.

Q.

In which direction does heat flow?

1. From a hot area to a cold area

2. From a cold area to a hot area

3. Heat is a stationary phenomenon

4. Heat flows in a random manner

Q. If there is no transfer of energy taking place between two objects, then ___.

1. they are at different temperature
2. they are at the same temperature
3. they are at very high temperature
4. they are at very low temperature

Q.

Himanshu has three buckets as shown below. He puts his right-hand in bucket A and left-hand in bucket B. He then puts both of his hands in normal water. His right-hand feels that the water here is hotter while his left-hand feels that the water here is colder.

What can you conclude from this?

1. Water in bucket A is hotter than water in bucket B.
2. Water in bucket A and B are equally hot.
3. Water in bucket A and B are equally cold.
4. Water in bucket B is hotter than water in bucket A.

Q. Higher temperature always indicates a higher average kinetic energy of the molecules.

1. True
2. False

Q.

The direction of heat flow takes place from hot area to a cold area.

1. True

2. False