GRE Subject 2026 Practice Test Physics Thermodynamics Free Quiz 1

1. What does thermodynamics deal with?

A. Heat, work, and temperature B. Motion of objects C. Electricity and magnetism D. Atomic scale phenomena

2. What law states that two bodies in equilibrium with a third are in equilibrium with each other?

A. First Law B. Second Law C. Zeroth Law D. Third Law

3. What does the Second Law of Thermodynamics state?

A. Energy conservation B. Entropy always increases C. Equilibrium D. Absolute zero

4. What does the Third Law of Thermodynamics state?

A. Entropy approaches zero at absolute zero B. Entropy increases C. Entropy constant D. Entropy infinite

5. What is an adiabatic process?

A. Isothermal B. Isobaric C. Adiabatic D. Isochoric

6. What is an isothermal process?

A. Adiabatic B. Isobaric C. Isochoric D. Isothermal

7. What is entropy?

A. Enthalpy B. Internal energy C. Entropy D. Gibbs free energy

8. What is the definition of enthalpy?

A. H = U - PV B. H = U/T C. H = G + TS D. H = U + PV

9. What is internal energy?

A. Enthalpy B. Internal energy C. Entropy D. Gibbs free energy

10. What is Gibbs free energy?

A. G = H - TS B. G = U + PV C. G = H + TS D. G = U - TS