Thermal Equilibrium

Q.

Define zeroth law of thermodynamics.

Q.

State the zeroth law of thermodynamics

Q. What is low melting point ?

Q. State one application of thermal expansion of liquids.

Q.

There are three objects - A, B and C.​

If object A is in thermal equilibrium with objects B and C.​

What can be concluded about them? ​

1. Objects B and C are also in thermal equilibrium.
2. Objects B and C are not in thermal equilibrium.
3. Object B is at a higher temperature than object C.
4. Object B is at a lower temperature than object C.

Q.

What are the difference between thermal expansion and thermal equilibrium

Q. Heat flows from a hot body to a cold body.

1. True
2. False

Q. Consider the following statements:
1. Heat is a form of energy.
2. Heat flows from low temperature to high temperature.
3. Heat flows from high temperature to low temperature.
Which of the above statement(s) is/are correct?

1. 1 and 2 only
2. 2 and 3 only
3. 1 and 3 only
4. 1 only

Q.

An iron ball at temperature of ${45}^{\circ }C$ is dropped in a glass of water. What is the temperature of water, if there is no heat flow between water and the iron ball?

1. $0^{\circ }C$
2. ${100}^{\circ }C$
3. ${45}^{\circ }C$
4. ${54}^{\circ }C$

Q. Match the following based on heat and temperature.

1. Flow of heat
2. Active particles
3. Net heat flow is zero

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 such an observation?

1. Temperature of A > Temperature of B

2. Temperature of B > Temperature of A

3. Can't be determined

4. Temperature of A = Temperature of B

Q. In which of the following cases is thermal equilibrium achieved?

1. One body is at 45-degree Celcius and other at 35-degree Celcius
2. One body is at 0 degree Celcius and other at -5 degree Celcius
3. One body is at 75-degree Celcius and other at 100-degree Celcius
4. Both the bodies are at 55-degree Celcius

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. Temperature of boiling water cannot be measured by a ________ thermometer.

1. Clinical thermometer
2. Laboratory thermometer
3. Both $A and B
4. None of these

Q.

How is the general variation of the core body temperature In humans?

Q. What do you understand by thermal expansion of a substance?

Q.

What do you mean by thermal equilibrium?

Q.

An equal amount of water is taken in two different containers and their temperatures are ${90}^{o}C$ and ${30}^{o}C$, respectively. If the rise in temperature of the cold water is equal to the fall in temperature of the hot water, then the common temperature of the mixture is ____

1. ${45}^{o}C$

2. ${66}^{o}C$

3. ${30}^{o}C$

4. ${60}^{o}C$

Q. Which of the following substances does not always expand on heating?

1. Copper
2. Water
3. Oil
4. Iron

Q.

The specific latent fusion of ice in SI system:

1. 336 Jg^-1

2. 336, 000 J kg^-1

3. 336 Jg^-1 °C^-1

4. 336, 000 Jkg^-1 °C^-1

Q. Write true or false for given statement:
A mercury thermometer makes use of the property of expansion of liquids on heating.

1. False
2. True

Q. Consider the following statements:
1. Heat is a form of energy.
2. Heat flows from low temperature to high temperature.
3. Heat flows from high temperature to low temperature.
Which of the above statement(s) is/are correct?

1. 1 and 2 only
2. 2 and 3 only
3. 1 and 3 only
4. 1 only

Q.

Laboratory thermometer measures the temperature in the range of _______ C to ${110}^o$ C.

Q. When two bodies are brought in contact with each other and no heat flows between them, then the bodies have .

1. equal mass
2. equal temperature
3. equal heat

Q. hot bodies in the universe radiate heat.

1. Some
2. Most
3. All

Q.

When two bodies are brought in contact with each other and no heat flows between them, the bodies can be at different temperatures.

Say True or False.

1. True

2. False

Q. Heat flows from a hot body to a cold body.

1. True
2. False

Q. Difference between Melting point and Freezing point. Examples of substances having separate Melting and Freeing points.

Q.

You are given two cup of coffees. You can determine which one is hotter just by touching it. But is sense of touch reliable measure of hotness and coldness?

1. Never Reliable

2. None of these

3. Sometimes Reliable

4. Always Reliable

Q. When two bodies A and B are brought in contact with each other, heat flows from A to B, then .
(A and B have temperature $T_{A}and{T}_B$ respectively)

1. $T_A<T_B$
2. $T_A=T_B$
3. $T_A>T_B$