Thermal Physics II Quiz

What are the thermodynamic variables that specify the state of a system?

• Length, Width, Height

• Pressure, Volume, Temperature

• Mass, Density, Energy

• Velocity, Acceleration, Force

What is the equation of state for an ideal gas?

• V = NkT/P

• P = NkT/V

• P = V/T

• PV = NkT

What is the mathematical expression for the First Law of Thermodynamics?

• ΔE = q + w

• ΔE = q - w

• ΔE = q * w

• ΔE = q / w

What are work and heat referred to as in thermodynamics?

• State variables

• Thermal variables

• Path variables

• Dynamic variables

What is the work done by an expanding gas in adiabatic expansion?

• w = VdP

• w = PdV

• w = -PdV

• w = 0

What is the specific heat at constant volume for a substance?

• Cv = q / ΔV

• Cv = q / ΔT

• Cv = w / ΔT

• Cv = w / ΔV

What is the efficiency of a heat engine working between two temperatures Tc and Th?

• ε = 1 - Tc/Th

• ε = 1 + Tc/Th

• ε = Th/Tc

• ε = Tc/Th

What is the maximum efficiency of a nuclear reactor with core temperature 300K and heat rejection temperature 30K?

• 10.471%

• 20.942%

• 30.213%

• 40.684%

What is the main result of the Second Law of Thermodynamics?

• No process can transfer thermal energy from a cooler object to a hotter object

• Heat always flows from a hotter object to a cooler object

• Energy is always conserved in a closed system

• Work done is always proportional to the change in internal energy

What is a thermal reservoir in the context of thermodynamics?

• A large mass of material at constant temperature

• A small mass of material at variable temperature

• A system that can only absorb heat

• A system that can only do work