Transfer of Heat

Q. What is thermal expansion? Explain the different types of expansions.

Q.

What are the three effects of heat on an object?

Q.

In which methods of heat transfer, gravity does not play any part?

Q. Thermal expansion is the tendency of matter to change its shape, area, and volume in response to a change in temperature.

1. True

2. False

Q. Why does the land warm and cool down faster than the sea
why not otherwise

Q. Heat energy flows from one body to another if there is a difference in between the two bodies.

1. temperature
2. mass
3. height

Q.

Expansion of all liquids and gases are different.

1. True
2. False

Q.

Define the following: thermal expansion.

Q.

(1): when a liquid in a container is heated first the level of the liquid falls down and then rises .

(2): when the liquid in a container is heated first the container undergoes expansion and generally, the expansion of the liquid is greater than that of solid.

1. Both 1 and 2 are true and 2 is the correct explanation of 1
2. Both 1 & 2 are true but 2 is not the correct explanation of 1.
3. 1 is true but 2 is false
4. 1 is false but 2 is true

Q. Heat energy flows from one body to another if there is a difference in between the two bodies.

1. temperature
2. mass
3. height

Q. The initial temperatures of two bodies B and C were ${\text{T}}_1$ and ${\text{T}}_2$ respectively. Now, they are brought into contact and heat starts flowing from C to B until their temperature reaches $\text{T}$, then which of the following are true?

1. $\text{T}>{\text{T}}_1$
2. $\text{T}<{\text{T}}_2$
3. $\text{T}<{\text{T}}_1$
4. $\text{T}>{\text{T}}_2$

Q. Which among 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. Heat energy flows from cold body to the hot body.

Q. In which of the following cases, the heat will flow from body X to body Y?

1. When heat content of body X is greater than that of body Y.
2. When temperature of body X is greater than that of body Y.
3. When heat content of both the bodies are same.
4. When both heat content and temperature of body Y is greater.

Q. The particles in a body become more active when the temperature of the body

1. increases
2. decreases
3. remains same

Q. The particles in a body become more active when the temperature of the body

1. increases
2. decreases
3. remains same

Q. Degree of hotness or coldness of a body is called as the temperature.

1. False
2. True

Q. Heat energy flows from one body to another if there is a difference in between the two bodies.

1. temperature
2. mass
3. height

Q.

When two bodies A and B are brought in contact with each other, heat does not flow between them. When another body C is brought in contact with B, the heat starts flowing from C to B. After the heat flow stops, C is now brought into contact with A, then which of the following is correct?

1. No heat flows between A and C.

2. Heat flows from A to C.

3. Heat flows from C to A.

4. Heat first flows from A to C and then from C to A.

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. Two metallic objects A and B are brought in contact, but there is no heat transfer between them. What is the possible reason for this?

1. Temperature of A > Temperature of B

2. Temperature of B > Temperature of A

3. Temperature of A = Temperature of B

4. Can't be determined

Q.

Thermal expansion is the property due to which, increasing the temperature of an object changes its ___ .

1. colour

2. dimensions or volume

3. weight

4. mass

Q. Flow of heat always takes place from a cold body to a hot body.

1. True
2. False