First Law of Thermodynamics Quiz: Test Your Understanding

Question 1

During an isobaric process experienced by an ideal gas, which of the following remains constant?

Accepted Answer

Pressure

Answer

Volume

Answer

Temperature

Answer

Enthalpy

Question 2

Entropy is a measure of:

Accepted Answer

Order or disorder of a system

Answer

Energy or work of a system

Answer

Heat or temperature of a system

Answer

Mass or volume of a system

Question 3

Which of the following processes involves no heat transfer to or from the system?

Accepted Answer

Expansion of a gas in a vacuum

Answer

Compression of a gas in a cylinder

Answer

Heating of a gas at constant volume

Answer

Cooling of a gas at constant pressure

Question 4

For a given heat engine, efficiency is calculated as:

Accepted Answer

The ratio of the work output to the heat input.

Answer

The ratio of the heat output to the work input.

Answer

The ratio of the heat input to the work output.

Answer

The ratio of the work output to the heat output.

Question 5

Which of the following is **NOT** a form of energy transfer?

Accepted Answer

Mass

Answer

Heat

Answer

Work

Answer

Radiation

Question 6

The First Law of Thermodynamics states that:

Accepted Answer

Energy is always conserved

Answer

Energy can be created or destroyed

Answer

Heat flows from cold to hot objects

Answer

Work is the only form of energy that can be transferred

Question 7

Which of the following is the SI unit of heat?

Accepted Answer

Joule

Answer

Watt

Answer

Calorie

Answer

British Thermal Unit

Question 8

The enthalpy of a system is:

Accepted Answer

The sum of its internal energy and the product of its pressure and volume

Answer

The difference between its internal energy and the product of its pressure and volume

Answer

The amount of heat transferred to the system at constant pressure

Answer

The amount of work done by the system at constant volume

Question 9

Which of the following is a **reversible** process?

Accepted Answer

Isothermal expansion

Answer

Adiabatic compression

Answer

Adiabatic expansion

Answer

Isochoric heating

Question 10

The entropy of a system is a measure of its:

Accepted Answer

Disorder

Answer

Order

Answer

Energy

Answer

Temperature

Question 11

Which of the following is NOT a valid mode of heat transfer?

Accepted Answer

Entropy

Answer

Convection

Answer

Conduction

Answer

Radiation

Question 12

Which of the following is the SI unit of specific heat capacity?

Accepted Answer

J/(kg K)

Answer

J/kg

Answer

kg/(J K)

Answer

J/(K kg)

Question 13

Which of the following is a thermodynamic property?

Accepted Answer

Temperature

Answer

Force

Answer

Gravitational constant

Answer

Velocity

Question 14

A Carnot heat engine has an efficiency of 60%. What is the ratio of the temperature of the hot reservoir to the temperature of the cold reservoir?

Accepted Answer

5/3

Answer

3/5

Answer

2/3

Question 15

A system undergoes a process in which its enthalpy remains constant. Which of the following processes is it?

Accepted Answer

Isoenthalpic process

Answer

Isochoric process

Answer

Isobaric process

Question 16

According to the First Law of Thermodynamics, the sum of heat added to a system and work done by the system is equal to:

Accepted Answer

The change in the system's internal energy

Answer

The change in the system's pressure

Answer

The change in the system's volume

Question 17

Which of the following processes has constant temperature?

Accepted Answer

Isothermal

Answer

Adiabatic

Answer

Isobaric

Answer

Isochoric

Question 18

An adiabatic process is characterized by:

Accepted Answer

No heat transfer between the system and the surroundings

Answer

Constant temperature

Answer

Constant volume

Answer

Constant pressure

Question 19

The internal energy of a system can be changed by:

Accepted Answer

Heat transfer and work

Answer

Work only

Answer

Heat transfer only

Question 20

Which quantity is a measure of energy?

Accepted Answer

Joule

Answer

Pascal

Answer

Newton

Answer

Watt

Question 21

The First Law of Thermodynamics applies to:

Accepted Answer

All closed and open systems

Answer

Only isolated systems

Answer

Only open systems

Answer

Only closed systems

Question 22

Which of the following is NOT a consequence of the First Law of Thermodynamics?

Accepted Answer

Energy can be created or destroyed

Answer

Heat cannot flow spontaneously from a colder to a hotter body

Answer

The total energy of an isolated system remains constant

Answer

Energy can be transferred from one form to another