4

# First law of thermodynamics deals with the

Direction of energy transfer

Reversible processes only

Irreversible processes only

None of these

A. Direction of energy transfer

4

Surface tension

Free energy

Specific heat

Refractive index

4

# Which of the following is not an intensive property?

Chemical potential

Surface tension

Heat capacity

None of these

4

# Pick out the Clausius-Clapeyron equation from the following:

dP/dT = ΔH/TΔV

ln P = - (ΔH/RT) + constant

ΔF = ΔH + T [∂(ΔF)/∂T]P

None of these

4

Temperature

Mass

Volume

Pressure

4

# Entropy is a/an

State function

Macroscopic property

Extensive property

None of these

4

# A refrigeration cycle is a reversed heat engine. Which of the following has the maximum value of the co-efficient of performance (COP) for a given refrigeration effect?

Vapor compression cycle using expansion valve

Air refrigeration cycle

Vapor compression cycle using expansion engine

Carnot refrigeration cycle

4

# In case of a close thermodynamic system, there is __________ across the boundaries.

No heat and mass transfer

No mass transfer but heat transfer

Mass and energy transfer

None of these

4

# At the critical point of a substance

The surface tension vanishes

Liquid and vapour have the same density

There is no distinction between liquid and vapour phases

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

4

# Gibbs free energy per mole for a pure substance is equal to the

Latent heat of vaporisation

Chemical potential

Molal boiling point

Heat capacity

4

# Pick out the wrong statement.

Enthalpies of all elements in their standard states are assumed to be zero

Combustion reactions are never endothermic in nature

Heat of reaction at constant volume is equal to the change in internal energy

Clausius-Clapeyron equation is not applicable to melting process

4

# For an isothermal process, the internal energy of a gas

Increases

Decreases

Remains unchanged

Data insufficient, can't be predicted

4

Gibbs-Duhem

Gibbs-Helmholtz

Maxwell's

None of these

4

# An isentropic process is carried out at constant

Volume

Pressure

Temperature

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

4

# Partial molar free energy of an element A in solution is same as its

Chemical potential

Activity

Fugacity

Activity co-efficient

4

Stirling

Brayton

Rankine

None of these

4

Zero

Unity

Infinity

None of these

4

A = H - TS

A = E - TS

A = H + TS

None of these

4

(∂E/∂T)V

(∂E/∂V)T

(∂E/∂P)V

(∂V/∂T)P

4

Eutectic

Triple

Plait

Critical

4

# Which of the following exemplifies an adiabatic process?

Melting of ice

Condensation of alcohol vapor

Sudden bursting of a cycle tube

Evaporation of water

4

# Free energy changes for two reaction mechanism 'X' and 'Y are respectively - 15 and - 5 units. It implies that X is

Slower than Y

Faster than Y

Three times slower than Y

Three times faster than Y

4

-94 kcal

+94 kcal

> 94 kcal

< -94 kcal

4

# Entropy of a substance remains constant during a/an __________ change.

Reversible isothermal

Irreversible isothermal

None of these

4

(dF)T, p <0

(dF)T, p = 0

(dF)T, p > 0

(dA)T, v >0

4

Only ΔE = 0

Only ΔH =0

ΔE = ΔH = 0

dQ = dE

4

0.5

3.5

4.5

8.5

4

# In an ideal gas mixture, fugacity of a species is equal to its

Vapor pressure

Partial pressure

Chemical potential

None of these

4

# The efficiency of an Otto engine compared to that of a diesel engine, for the same compression ratio will be

More

Less

Same

Data insufficient to predict

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