# Zeroth Law of Thermodynamics Questions and Answers

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Do you know what the Zeroth law of thermodynamics is? Try out this practice test with the Zeroth law of thermodynamics questions and answers. If you know about this famous principal law of thermodynamics, this quiz will be easy for you. You can use this quiz to test your knowledge as well as enhance it. All the best for a perfect score on this quiz. Do not forget to share it with others interested in practicing thermodynamics.

• 1.

### The Zeroth Law of Thermodynamics deals with which of the following?

• A.

Heat

• B.

Thermal equilibrium

• C.

Thermal energy

• D.

Kinetic energy

B. Thermal equilibrium
Explanation
The Zeroth Law of Thermodynamics deals with thermal equilibrium. This law states that if two systems are separately in thermal equilibrium with a third system, then they are in thermal equilibrium with each other. Thermal equilibrium refers to a state where there is no net flow of heat between two systems, indicating that they have reached the same temperature. This law is fundamental in understanding the behavior of heat and temperature in thermodynamic systems.

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• 2.

### Convert a room temperature of 22ºC to kelvin.

• A.

295

• B.

297

• C.

305

• D.

323

A. 295
Explanation
To convert a temperature from Celsius to Kelvin, you need to add 273. Therefore, to convert 22°C to Kelvin, you add 273 to get 295 K.

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• 3.

### How much heat energy is required to melt 4 kg of ice at its melting point? (lf = 3.35 × 105 J kg-1). Keep scientific notation.

• A.

1 340 000 J

• B.

3.35 × 105 J

• C.

1.34 × 106 J

• D.

13.4 × 10J

D. 13.4 × 10J
Explanation
The correct answer is 13.4 × 105 J. This is the correct answer because it represents the amount of heat energy required to melt 4 kg of ice at its melting point. The specific latent heat of fusion (lf) for ice is given as 3.35 × 105 J kg-1. To find the total heat energy required, we multiply the specific latent heat of fusion by the mass of the ice. In this case, 3.35 × 105 J kg-1 multiplied by 4 kg equals 13.4 × 105 J.

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• 4.

### What is defined as the collection of objects that we examine?

• A.

• B.

Diathermic

• C.

Surrounding

• D.

System

D. System
Explanation
The term "system" refers to the collection of objects that are being examined or studied. It represents the specific set of objects or substances that are the focus of analysis or observation. In scientific or engineering contexts, understanding the properties and behavior of a system is crucial for studying its interactions and making predictions. The other options provided (Adiabatic, Diathermic, and Surrounding) do not accurately define the collection of objects being examined and are therefore incorrect.

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• 5.

### If two systems are in thermal equilibrium with a third system, then those two are also in thermal equilibrium with each other.

• A.

True

• B.

False

A. True
Explanation
If two systems A and B are in thermal equilibrium with a third system C, it means that the temperature of A is the same as the temperature of C, and the temperature of B is also the same as the temperature of C. Therefore, the temperatures of A and B are equal, indicating that they are in thermal equilibrium with each other. Hence, the statement is true.

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• 6.

### Which of the following does not allow heat to flow in and out?

• A.

Surrounding

• B.

• C.

Diabatic

• D.

System

Explanation
Adiabatic refers to a process or system in which there is no transfer of heat between the system and its surroundings. This means that heat cannot flow in or out of an adiabatic system. Therefore, adiabatic is the correct answer as it does not allow heat to flow in and out.

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• 7.

### Convert 50 K to ºC.

• A.

-220

• B.

220

• C.

-223

• D.

223

C. -223
Explanation
To convert from Kelvin (K) to Celsius (ºC), you need to subtract 273.15 from the given temperature in Kelvin. In this case, subtracting 273.15 from 50 K gives us -223.15 ºC. Since temperature is usually rounded to the nearest whole number, the correct answer is -223 ºC.

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• 8.

### A solid A is in thermal equilibrium with solid B. Solid B has the same temperature as solid C. If the three solids have different masses and compositions, which of the following statements is correct?

• A.

There will be no net transfer of energy if A is placed in thermal contact with C

• B.

B may not necessarily be in thermal equilibrium with C

• C.

A and B have the same heat capacity

• D.

A and C have the same latent heat capacity

A. There will be no net transfer of energy if A is placed in thermal contact with C
Explanation
If solid A is in thermal equilibrium with solid B and solid B has the same temperature as solid C, it means that all three solids are at the same temperature. In thermal equilibrium, there is no net transfer of energy between objects, so if solid A is placed in thermal contact with solid C, there will be no net transfer of energy. This is because they are already at the same temperature. Therefore, the statement "There will be no net transfer of energy if A is placed in thermal contact with C" is correct.

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• 9.

### Three thermodynamic systems are at a temperature of 60ºC. Which option is true about them?

• A.

No heat flow occurs between the three systems

• B.

The three systems are in thermal equilibrium with each other

• C.

It obeys zeroth law of thermodynamics

• D.

All of the above

D. All of the above
Explanation
The correct answer is "All of the above." This means that all of the options mentioned in the question are true about the three thermodynamic systems at a temperature of 60°C. This includes the fact that no heat flow occurs between the three systems, the three systems are in thermal equilibrium with each other, and it obeys the zeroth law of thermodynamics.

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• 10.

### A thermometer works on the principle of which of the following

• A.

First law of equilibrium

• B.

Second law of equilibrium

• C.

Zeroth law of equilibrium

• D.

Law of state equilibrium

C. Zeroth law of equilibrium
Explanation
A thermometer works on the principle of the Zeroth law of equilibrium. This law states that if two objects are in thermal equilibrium with a third object, then they are in thermal equilibrium with each other. In the case of a thermometer, it measures the temperature by coming into thermal equilibrium with the object being measured. The Zeroth law of equilibrium allows the thermometer to accurately measure the temperature by comparing its own thermal equilibrium state with that of the object.

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• Current Version
• Aug 16, 2023
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• Nov 22, 2022
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