Thermodynamics and PV Diagrams Quiz

What does the first law of thermodynamics state?

• Work done by a gas is always positive.

• Heat cannot be converted into work.

• The total energy of an isolated system is constant.

• Energy can be created or destroyed.

If a gas does 8 joules of work after being supplied with 10 joules of heat, what happens to the remaining 2 joules?

• It is converted into potential energy.

• It is used to increase the volume of the gas.

• It is converted into internal energy.

• It is lost to the surroundings.

In an isothermal process, what remains constant?

• Pressure

• Volume

• Internal energy

• Temperature

What is the relationship between pressure and volume in an isothermal process?

• Directly proportional

• Inversely proportional

• Unrelated

• Exponentially proportional

In an adiabatic process, what is the value of heat (Q) exchanged?

• Zero

• Positive

• Depends on the process

• Negative

What is the adiabatic constant for a monatomic gas like argon?

• 1

• 5/3

• 3/2

• 7/5

In a PV diagram, what does the area under the curve represent?

• Change in internal energy

• Work done

• Change in temperature

• Heat supplied

What happens to the pressure and volume in an isothermal compression?

• Pressure increases, volume decreases

• Pressure decreases, volume increases

• Both increase

• Both decrease

During the compression stroke of a four-stroke engine, what happens to the air-fuel mixture?

• It is mixed with exhaust gases.

• It is ignited by a spark plug.

• It is compressed by the piston.

• It is expelled from the cylinder.

What drives the piston down during the power stroke in a four-stroke engine?

• Compression of the air-fuel mixture

• Combustion of the air-fuel mixture

• Exhaust of gases

• Intake of air