Thermodynamics

Which of the following is the first law of thermodynamics?

• Energy cannot be created or destroyed, only transformed.

• The total entropy of an isolated system can never decrease.

• No process is possible whose sole result is the transfer of heat from a cooler to a hotter body.

• The entropy of a perfect crystal at absolute zero is exactly zero.

Which of the following statements about entropy is true?

• Entropy is a measure of the disorder of a system.

• Entropy can never decrease in an isolated system.

• Both A and B.

• Entropy is the same as energy.

Which process describes a system that absorbs heat while doing work?

• Isothermal process

• Adiabatic process

• Isobaric process

• Isochoric process

What is the primary unit of heat in the SI system?

• Joule

• Calorie

• Watt

• Newton

In a reversible process, which of the following is true?

• The system is always at equilibrium.

• The process can be reversed by an infinitesimal change.

• It can produce work without any entropy increase.

• All of the above.