First law of thermodynamics

What does it mean by positive work?

• work is done by the system

• work is done in positive direction

• work is done on the system

• work is done in negative direction

What does it mean by negative heat?

• heat enters the system

• heat flows in positive direction

• heat leaves the system

• heat flows in negative direction

What is stated by the first law of thermodynamics?

• The internal energy of a system changes from an initial value to a final value is zero.

• The internal energy of a system changes from an initial value to a final value due to heat and temperature.

• The internal energy of a system changes from an initial value to a final value due to heat and work.

• The internal energy of a system changes from an initial value to a final value is constant.

Which thermodynamics process does no work on its surrounding?

• isochoric process

• isothermal process

• isobaric process

• adiabatic process

Which thermodynamics process with no heat transfer into or out of a system?

• isobaric process

• isothermal process

• isochoric process

• adiabatic process

The internal energy of an ideal gas depends on its ....

• pressure

• temperature

• volume

• pressure, temperature and volume

The following statements are TRUE about free expansion except ....

• no change in internal energy

• no work done by the system

• no change in temperature

• no change in volume

What is the limitation of the first law of thermodynamics?

• it does not mention the quantity of heat

• it does not mention the direction of the flow of heat

• it does not mention the quantity of work

• it does not mention the direction of work

Which is FALSE about the heat capacity of a diatomic ideal gas?

• $\frac{C_p}{C_v}=\frac{7}{5}$

• $\frac{C_v}{C_p}=\frac{7}{5}$

• $C_p=\frac{7}{2}R$

• $C_v=\frac{5}{2}R$

Which is TRUE about heat capacity of a monoatomic ideal gas?

• $C_p=\frac{5}{2}R$

• $C_v=\frac{5}{2}R$

• $C_p=\frac{3}{2}R$

• $C_v=\frac{5}{3}R$