Thermodynamics Quiz

Which of the following is a property of a pure substance?

• it has constant chemical composition throughout its mass

• it is a one-component system

• it may exist in one or more phases

• all of the mentioned

A saturation state is a state from which a change of phase may occur

• without a change of pressure or temperature

• with a change of pressure or temperature

• both of the mentioned

• none of the mentioned

Which of the following exists in a p-V diagram for water?

• saturated solid line

• saturated liquid lines

• saturated vapour line

• all of the mentioned

The triple point is a line on the p-V diagram, where all the three phases, solid, liquid and gas exist.

• TRUE

• FALSE

Which of the following represents the specific volume during phase transition.

• Vf-Vg

• Vg-Vf

• Vf+Vg

• none of the mentioned

At a pressure below the triple point line,

• the substance cannot exist in the liquid phase

• the substance when heated transforms from solid to vapour

• both of the mentioned

• none of the mentioned

Consider the following:

1-Air

2-Gaseous combustion products

3-Steam

Which of these are pure substances, assuming there is no phase change?

• 1 and 2 only

• 1 and 3 only

• 2 and 3 only

• 1, 2 and 3

Which p-v diagram for steam illustrates correctly isothermal process undergone by wet steam till it become superheated?

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Consider the phase diagram of a certain substance as shown in the given figure. Match the process) with the curves/lines and select the correct answer from the lists:

• EF (Vaporization), ED (Fusion) & EG (Sublimation)

• ED (Vaporization), EG (Fusion) & EF (Sublimation)

• EF (Vaporization), EG (Fusion) & ED (Sublimation)

• ED (Vaporization), EF (Fusion) & EG (Sublimation)

Phase change occurs at

• constant pressure

• constant temperature

• constant pressure and temperature

• none of the mentioned