4

Pressure remains constant

Pressure is increased

Temperature remains constant

None of these

D. None of these

4

Claude gas liquefaction process employs cooling

At constant pressure

By throttling

By expansion in an engine

None of these

4

F = E - TS

F = H - TS

F = H + TS

F = E + TS

4

Pressure

Solubility

Temperature

None of these

4

Pick out the correct statement:

In an isothermal system, irreversible work is more than reversible work

Under reversible conditions, the adiabatic work is less than isothermal work

Heat, work, enthalpy and entropy are all 'state functions'

Matter and energy cannot be exchanged with the surroundings in a closed system

4

The thermodynamic law, PVy = constant, is not applicable in case of

Ideal compression of air

Free expansion of an ideal gas

Adiabatic expansion of steam in a turbine

Adiabatic compression of a perfect gas

4

Temperature

Pressure

Volume

None of these

4

ds = 0

ds < 0

ds > 0

ds = Constant

4

Isochoric

Isobaric

Isothermal

4

72

92

142

192

4

Pick out the correct statement.

Entropy and enthalpy are path functions

In a closed system, the energy can be exchanged with the surrounding, while matter cannot be exchanged

All the natural processes are reversible in nature

Work is a state function

4

Isometric

Isentropic

Isothermal

4

A gas can be liquefied by pressure alone only, when its temperature is __________ its critical temperature.

Less than

More than

Equal to or higher than

Less than or equal to

4

Indeterminate

Zero

Negative

None of these

4

The unit of fugacity is the same as that of the

Pressure

Temperature

Volume

Molar concentration

4

V/T = Constant

V ∝ 1/T

V ∝ 1/P

PV/T = Constant

4

3

2

1

0

4

A change in state involving a decrease in entropy can be spontaneous, only if

It is exothermic

It is isenthalpic

It takes place isothermally

It takes place at constant volume

4

5 & 3

3.987 & 1.987

1.987 & 0.66

0.66 & 1.987

4

PVy = constant, holds good for an isentropic process, which is

Reversible and isothermal

Isothermal and irreversible

4

Which of the following is affected by the temperature?

Fugacity

Activity co-efficient

Free energy

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

4

Consider the process A & B shown in the figure given below: In this case, it is possible that

Both the processes are isothermal

Process A is isothermal while B is adiabatic

Process A is adiabatic while B is isothermal

4

μ = (∂P/∂T)H

μ = (∂T/∂P)H

μ = (∂E/∂T)H

μ = (∂E/∂P)H

4

Clausius-Clapeyron equation is applicable to __________ equilibrium processes.

Solid-vapor

Solid-liquid

Liquid-vapor

All (A), (B) and (C)

4

0

1

2

3

4

The internal energy of an incompressible fluid depends upon its

Pressure

Temperature

Both (A) & (B)

Neither (A) nor (B)

4

The expression for entropy change given by, ΔS = - nR ln (P2/P1), holds good for

Expansion of a real gas

Reversible isothermal volume change

Heating of an ideal gas

Cooling of a real gas

4

What happens in a reversible adiabatic expansion process?

Heating takes place

Cooling takes place

Pressure is constant

Temperature is constant

4

Surface tension

Free energy

Specific heat

Refractive index

4

Enthalpy

Entropy

Pressure

None of these