4

0

1

2

3

B. 1

4

# Pick out the correct statement.

A real gas on expansion in vacuum gets heated up

An ideal gas on expansion in vacuum gets cooled

An ideal gas on expansion in vacuum gets heated up

A real gas on expansion in vacuum cools down whereas ideal gas remains unaffected

4

12 P1V1

6 P1 V1

3 P1V1

P1 V1

4

Cv.dT

Cp.dT

∫ Cp.dT

∫ Cv.dT

4

1

< 1

> 1

>> 1

4

Molten sodium

Mercury

Molten potassium

4

# Internal energy is equal to the heat absorbed in case of a/an __________ process.

Constant volume

Polytropic

Constant pressure

4

1

2

3

4

4

# A cylinder contains 640 gm of liquid oxygen. The volume occupied (in litres) by the oxygen, when it is released and brought to standard conditions (0°C, 760 mm Hg) will be __________ litres.

448

224

22.4

Data insufficient; can't be computed

4

Temperature

Pressure

Volume

Entropy

4

# Work done is a

Property of the system

Path function

Point function

State description of a system

4

Free energy

Entropy

Refractive index

None of these

4

# Entropy of an ideal gas depends upon its

Pressure

Temperature

Both (A) & (B)

Neither (A) nor (B)

4

# A refrigeration cycle is the same as a __________ cycle,

Turbine

Heat engine

Reversed heat engine

None of these

4

# The Maxwell relation derived from the differential expression for the Helmholtz free energy (dA) is

(∂T/∂V)S = - (∂P/∂S)V

(∂S/∂P)T = - (∂V/∂T)P

(∂V/∂S)P = (∂T/∂P)S

(∂S/∂V)T = (∂P/∂T)V

4

Zeroth

First

Second

Third

4

Surface tension

Free energy

Specific heat

Refractive index

4

# The expression, nRT ln(P1/P2), is for the __________of an ideal gas.

Compressibility

Work done under isothermal condition

Co-efficient of thermal expansion

4

The same

Less than

Greater than

Different than

4

Zero

Positive

Negative

None of these

4

# For a spontaneous process, free energy

Is zero

Increases

Decreases whereas the entropy increases

And entropy both decrease

4

# Steam undergoes isentropic expansion in a turbine from 5000 kPa and 400°C (entropy = 6.65 kJ/kg K) to 150 kPa) (entropy of saturated liquid = 1.4336 kJ/kg. K, entropy of saturated vapour = 7.2234 kJ/kg. K) The exit condition of steam is

Superheated vapour

Partially condensed vapour with quality of 0.9

Saturated vapour

Partially condensed vapour with quality of 0.1

4

# Clapeyron Equation deals with the

Rate of change of vapour pressure with temperature

Effect of an inert gas on vapour pressure

Calculation of ΔF for spontaneous phase change

Temperature dependence of heat of phase transition

4

# Entropy, which is a measure of the disorder of a system, is:

Independent of pressure

Independent of temperature

Zero at absolute zero temperature for a perfect crystalline substance

All (A), (B) & (C)

4

# Which of the following will increase the volume of a real gas by four times?

Doubling the absolute temperature as well as pressure of the gas

Reducing pressure to one fourth at constant temperature

Reducing temperature to one fourth at constant pressure

Reducing the temperature to half and doubling the pressure

4

Temperature

Mass

Volume

Pressure

4

# Which of the following is Virial equation of state?

(p + a/V2)(V - b) = nRT

PV = nRT

PV = A + B/V + C/V2 + D/V3 + ...

None of these

4

RT ln K

-RT ln K

-R ln K

T ln K

4

-19.4

-30.2

55.2

-55.2

4

0

> 0

< 0

None of these