Transfer of Heat

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

1. increases
2. decreases
3. remains same

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.

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

1. True
2. False

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

1. False
2. True

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. 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. 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.

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. 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