Q.1

Specific __________ does not change during a phase change (e.g. sublimation, melting, vaporisation etc.).

  • entropy
  • internal energy
  • enthalpy
  • Gibbs free energy
Q.2

Sound waves propagation in air exemplifies an __________ process.

  • adiabatic
  • isothermal
  • isometric
  • none of these
Q.3

In Joule-Thomson porous plug experiment, the

  • enthalpy does not remain constant.
  • entire apparatus is exposed to surroundings.
  • temperature remains constant.
  • none of these.
Q.4

Gibbs free energy of mixing at constant pressure and temperature is always

  • 0
  • ∞
  • + ve
  • - ve
Q.5

Heat of formation of an element in its standard state is

  • 0
  • < 0
  • > 0
  • a function of pressure
Q.6

For equilibrium process (i.e. reversible) in an isolated system

  • ds = 0
  • ds < 0
  • ds > 0
  • ds = Constant
Q.7

The partial molar enthalpy of a component in an ideal binary gas mixture of composition Z, at a temperature T and pressure P, is a function only of

  • T
  • T and P
  • T, P and Z
  • T and Z
Q.8

When liquid and vapour phase of multi-component system are in equilibrium (at a given temperature and pressure), then chemical potential of each component is

  • same in both the phases.
  • zero in both the phases.
  • more in vapour phase.
  • more in liquid phase.
Q.9

4 kg moles of an ideal gas expands in vacuum spontaneously. The work done is

  • 4 J
  • ∞
  • 0
  • 8 J
Q.10

Boiling of liquid is accompanied with increase in the

  • vapor pressure.
  • specific Gibbs free energy.
  • specific entropy.
  • all (a), (b) and (c).
Q.11

Gibbs phase rule finds application, when heat transfer occurs by

  • conduction
  • convection
  • radiation
  • condensation
Q.12

A/an __________ system is exemplified by a vessel containing a volatile liquid in contact with its vapor.

  • isolated
  • closed
  • open
  • none of these
Q.13

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.
Q.14

Change of heat content when one mole of compound is burnt in oxygen at constant pressure is called the

  • calorific value
  • heat of reaction
  • heat of combustion
  • heat of formation
Q.15

The compressibility factor for an ideal gas isIts value for any other real gas is

  • 1
  • < 1
  • > 1
  • either (b) or (c), depends on the nature of the gas
Q.16

For an exothremic reaction

  • only enthalpy change (ΔH) is negative.
  • only internal energy change (ΔE) is negative.
  • both ΔH and ΔE are negative.
  • enthalpy change is zero.
Q.17

With increase in reduced temperature, the fugacity co-efficient of a gas at constant reduced pressure

  • increases
  • decreases
  • remains same
  • decreases linearly
Q.18

COP of a refrigerator drawing 1 kW of power per ton of refrigeration is about

  • 0.5
  • 3.5
  • 4.5
  • 8.5
Q.19

Compressibility factor (i.e., the ratio of actual volume of gas to the volume predicted by ideal gas law) for all gases are

  • always greater than one.
  • same at the same reduced temperature.
  • same at the same reduced pressure.
  • both(b) & (c).
Q.20

Change of state namely evaportation condensation, freezing and melting is an __________ process.

  • isothermal
  • adiabatic
  • isobaric
  • isochoric
Q.21

In a P-V diagram (for an ideal gas), an isothermal curve will coincide withan adiabatic curve (through a point), when

  • Cp < Cv
  • Cp = Cv
  • Cp > Cv
  • C ≥ Cv
Q.22

With increase in temperature, the internal energy of a substance

  • increases
  • decreases
  • remains unchanged
  • may increase or decrease; depends on the substance
Q.23

It is desired to bring about a certain change in the state of a system by performing work on the system under adiabatic conditions.

  • The amount of work needed is path dependent.
  • Work alone can not bring out such a change of state.
  • The amount of work needed is independent of path.
  • More information is needed to conclude anything about the path dependence or otherwise of the work needed.
Q.24

Clausius - Clayperon equation is applicable to __________ equilibrium processes.

  • solid-vapor
  • solid-liquid
  • liquid-vapor
  • all (a), (b) and (c)
Q.25

The intensive properties are

  • molar volume, density, viscosity and boiling point.
  • refractive index and surface tension.
  • both (a) and (b).
  • none of these.
Q.26

A Carnot cycle consists of the following steps :

  • Two isothermals and two isentropics.
  • Two isobarics and two isothermals.
  • Two isochorics and two isobarics.
  • Two isothermals and two isochorics.
Q.27

If two gases have same reduced temperature and reduced pressure, then they will have the same

  • volume
  • mass
  • critical temperature
  • none of these
Q.28

Which of the following is an extensive property of a system ?

  • Heat capacity
  • Molal heat capacity
  • Pressure
  • Concentration
Q.29

Pick out the wrong statement.

  • An ideal liquid or solid solution is defined as one in which each component obeys Raoult's law.
  • If Raoult's law is applied to one component of a binary mixture ; Henry's law or Raoult's law is applied to the other component also.
  • Henry's law is rigorously correct in the limit of infinite dilution.
  • none of these.
Q.30

Gibbs-Duhem equation

  • states that n1dμ1 + n2dμ2 + ....njdμj = 0, for a system of definite composition at constant temperature and pressure.
  • applies only to binary systems.
  • finds no application in gas-liquid equilibria involved in distillation.
  • none of these
Q.31

For an ideal gas, the enthalpy

  • increases with rise in pressure.
  • decreases with rise in pressure.
  • is independent of pressure.
  • is a path function.
Q.32

Entropy change for an irreversible isolated system is

  • ∞
  • 0
  • < 0
  • > 0
Q.33

The Joule-Thomson co-efficient is defined as (∂T/∂P)H. Its value at the inversion point is

  • ∞
  • 1
  • 0
  • -ve
Q.34

The number of degrees of freedom for a mixture of ice and water (liquid) are

  • 0
  • 2
  • 3
  • 1
Q.35

Which of the following is not correct for a reversible adiabatic process ?

  • TVγ-1 = constant
  • p1-γ.TY = constant
  • PVγ = constant
  • none of these
Q.36

The efficiency of a Carnot heat engine operating between absolute temperatures T1 and T2 (when, T1 > T2) is given by (T1 - T2)/T1. The co-efficient of performance (C.O.P.) of a Carnot heat pump operating between T1 and T2 is given by

  • T1/(T1-T2)
  • T2/(T1-T2)
  • T1/T2
  • T2/R1
Q.37

Which of the following is not an equation of state?

  • Bertholet equation
  • Clausius Clayperon equation
  • Beattie-Bridgeman equation
  • None of these
Q.38

A gas shows deviation from ideal behaviour at

  • low pressure and high temperature.
  • low pressure and low temperature.
  • low temperature and high pressure.
  • high temperature and high pressure.
Q.39

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

  • 448
  • 224
  • 22.4
  • data insufficient; can't be computed
Q.40

In the equation PVn = constant, if the value of n = y = Cp/Cv, then it represents a reversible __________ process.

  • isothermal
  • adiabatic
  • isentropic
  • polytropic
Q.41

For an ideal gas, the chemical potential is given by

  • RT dlnP
  • R dlnP
  • R dlnf
  • none of these
Q.42

Variation of equilibrium pressure with temperature for any two phases of a given substances is given by the __________ equation.

  • Gibbs-Duhem
  • Maxwell's
  • Clayperon
  • none of these
Q.43

Degree of freedom of a system consisting of a gaseous mixture of H2 and NH3 will be

  • 0
  • 1
  • 2
  • 3
Q.44

Dryness fraction of wet steam is defined as the ratio of mass of vapour in the mixture to the mass of mixture __________ calorimeter is not used for measuring the dryness fraction of steam.

  • Bomb
  • Separating
  • Bucket
  • Throttling
Q.45

After throttling, gas temperature

  • decreases
  • increases
  • remains same
  • may increase or decrease ; depends on the nature of the gas
Q.46

Minimum number of phases that exists in a system isNumber of chemical species in a colloidal system is

  • 1
  • 4
  • 2
  • 3
Q.47

Cp - Cv = R is valid for __________ gases.

  • ideal
  • all
  • very high pressure
  • very low temperature
Q.48

Fugacity of a component in an ideal gas mixture is euqal to the partial pressure of that component in the mixture. The fugacity of each component in a stable homogeneous solution at contant pressure and temperature __________ as its mole fraction increases.

  • decreases
  • decreases exponentially
  • increases
  • remains constant
Q.49

On opening the door of an operating refrigerator kept in a closed room, the temperature of the room will

  • increase
  • decrease
  • remain same
  • increase in summer and will decrease in winter
Q.50

Throttling (Joule-Thomson effect) process is a constant __________ process.

  • enthalpy
  • entropy
  • pressure
  • none of these
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