Q.1

Pick out the wrong statement.

  • A closed system does not permit exchange of mass with its surroundings but may permit exchange of energy.
  • An open system permits exchange of both mass and energy with its surroundings.
  • The term microstate is used to characterise an individual, whereas macro-state is used to designate a group of micro-states with common characteristics.
  • none of the above.
Q.2

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

  • chemical potential
  • activity
  • fugacity
  • activity co-efficient
Q.3

Compressibility factor of a gas is

  • not a function of its pressure.
  • not a function of its nature.
  • not a function of its temperature.
  • unity, if it follows PV = nRT.
Q.4

A solid metallic block weighing 5 kg has an initial temperature of 500°C.kg of water initially at 25°C is contained in a perfectly insulated tank. The metallic block is brought into contact with water. Both of them come to equilibrium. Specific heat of block material is 0.4 kJ.kg-1. K-1. Ignoring the effect of expansion and contraction and also the heat capacity to tank, the total entropy change in kJ.kg-1 , K-1 is

  • -1.87
  • 0
  • 1.26
  • 3.91
Q.5

dW and dq are not the exact differential, because q and W are

  • state functions
  • path functions
  • intensive properties
  • extensive properties
Q.6

1st law of thermodynamics is nothing but the law of conservation of

  • momentum
  • mass
  • energy
  • none of these
Q.7

The energy of activation of exothermic reaction is

  • zero.
  • negative.
  • very large compared to that for en-dothermic reaction.
  • not possible to predict.
Q.8

Which of the following is an undesirable characteristics of a refrigerant ?

  • It should be non-explosive.
  • It should have a sub-atmospheric vapor pressure at the temperature in refrigerator coils.
  • Its vapor pressure at the condenser temperature should be very high.
  • None of these.
Q.9

Which of the following decreases with increase in pressure ?

  • Melting point of ice
  • Melting point of wax
  • Boiling point of liquids
  • none of these
Q.10

The number of degree of freedom for an azeotropic mixture of ethanol and water in vapour-liquid equilibrium, is

  • 3
  • 1
  • 2
  • 0
Q.11

Trouton's ratio of __________ liquids is calculated using Kistyakowsky equation.

  • polar
  • non-polar
  • both (a) & (b)
  • neither (a) nor (b)
Q.12

The partial pressure of each constituent present in an alloy is __________ the total vapor pressure exerted by the alloy.

  • less than
  • equal to
  • more than
  • either (b) or (c); depends on the type of alloy
Q.13

The unity of Planck's constant 'h' in the equation, E = hv is

  • J/s
  • J.S
  • J/kmol
  • kmol/J
Q.14

Free energy change at equilibrium is

  • zero
  • positive
  • negative
  • indeterminate
Q.15

Kopp's rule is used to calculate the heat capacity of

  • solids
  • liquids
  • gases
  • all (a), (b) & (c)
Q.16

__________ explains the equilibrium constant for any chemical reaction.

  • Henry's law
  • Law of mass action
  • Hess's law
  • none of these
Q.17

Which of the following exemplifies an adiabatic process ?

  • Melting of ice.
  • Condensation of alcohol vapor.
  • Sudden bursting of a cycle tube.
  • Evaporation of water.
Q.18

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)
Q.19

Which of the following is not an extensive property ?

  • Free energy
  • Entropy
  • Refractive index
  • None of these
Q.20

"The rate at which a substance reacts is proportional to its active mass and the rate of a chemical reaction is proportional to the product of active masses of the reacting substances". This is the

  • Lewis-Randall rule.
  • statement of Vant-Hoff equation.
  • Le-Chatelier's principle.
  • none of these.
Q.21

In polytropic process (PVn = constant), if n =it means a/an __________ process.

  • adiabatic
  • reversible
  • isothermal
  • none of these
Q.22

Isentropic process means a constant __________ process.

  • enthalpy
  • pressure
  • entropy .
  • none of these
Q.23

When a gas is subjected to adiabatic expansion, it gets cooled due to

  • decrease in velocity.
  • decrease in temperature.
  • decrease in kinetic energy.
  • energy spent in doing work.
Q.24

Joule-Thomson effect i.e., a throttling process is a constant __________ process.

  • entropy
  • temperature
  • internal energy
  • enthalpy
Q.25

The internal energy of an ideal gas is a function of its __________ only.

  • molecular size
  • volume
  • pressure
  • temperature
Q.26

Activity co-efficient is a measure of the

  • departure from ideal solution behaviour.
  • departure of gas phase from idea] gas law.
  • vapour pressure of liquid.
  • none of these.
Q.27

Heat is added at constant pressure in an ideal __________ cycle.

  • Stirling
  • Brayton
  • Rankine
  • both (b) and (c)
Q.28

Specific/molar Gibbs free energy for a pure substance does not change during

  • sublimation
  • vaporisation
  • melting
  • either (a), (b) or (c)
Q.29

Heat pump

  • accomplishes only space heating in winter.
  • accomplishes only space cooling in summer.
  • accomplishes both (a) and (b).
  • works on Carnot cycle.
Q.30

The temperature at which both liquid and gas phases are identical, is called the __________ point.

  • critical
  • triple
  • freezing
  • boiling
Q.31

Critical temperature is defined as the temperature above which a gas will

  • not liquify (barring exceptions).
  • immediately liquify.
  • never liquify however high the pressure may be.
  • none of these.
Q.32

Enthalpy of a gas depends upon its

  • temperature
  • mass
  • volume
  • pressure
Q.33

Specific heat of a gas for a reversible adiabatic process is

  • negative
  • zero
  • infinity
  • none of these
Q.34

Isentropic process means a constant __________ process.

  • enthalpy
  • pressure
  • entropy .
  • none of these
Q.35

What is the ratio of adiabatic compressibility to isothermal compressibility ?

  • 1
  • < 1
  • > 1
  • >> 1
Q.36

At constant temperature and pressure, for one mole of a pure substance, the ratio of the free energy to the chemical potential is

  • zero
  • one
  • infinity
  • negative
Q.37

While dissolving a gas into a liquid at a constant temperature, the ratio of the concentration of the gas in the solution phase and in the gaseous phase is

  • infinity
  • unity
  • constant
  • negative
Q.38

In polytropic process (PVn = constant), if n =it means a/an __________ process.

  • adiabatic
  • reversible
  • isothermal
  • none of these
Q.39

The absolute entropy for all crystalline substances at absolute zero temperature is

  • zero
  • negative
  • more than zero
  • indeterminate
Q.40

Enthalpy of a gas depends upon its

  • temperature
  • mass
  • volume
  • pressure
Q.41

The change in __________ is equal to the reversible work for compression in steady state flow process under isothermal condition.

  • internal energy
  • enthalpy
  • Gibbs free energy
  • Helmholtz free energy
Q.42

Which of the following units is not present in both the vapor compression refrigeration system and absorption refrigeration system ?

  • Expansion valve
  • Condenser
  • Refrigerator
  • Compressor
Q.43

Charles' law for gases states that

  • = Constant
  • = Constant
Q.44

What is the value of maximum COP in case of absorption refrigeration, if refrigeration provided is at temperature, TR(where, T1 and T2 are source & surrounding temperatures respectively.)?

  • none of these
Q.45

For an isothermal reversible compression of an ideal gas

  • only ΔE = 0
  • only ΔH =0
  • ΔE = ΔH = 0
  • dQ = dE
Q.46

dW and dq are not the exact differential, because q and W are

  • state functions
  • path functions
  • intensive properties
  • extensive properties
Q.47

The absolute entropy for all crystalline substances at absolute zero temperature is

  • zero
  • negative
  • more than zero
  • indeterminate
Q.48

What is the value of maximum COP in case of absorption refrigeration, if refrigeration provided is at temperature, TR(where, T1 and T2 are source & surrounding temperatures respectively.)?

  • none of these
Q.49

Work done is a

  • property of the system
  • path function
  • point function
  • state description of a system
Q.50

The heat capacities for the ideal gas state depend upon the

  • pressure
  • temperature
  • both (a) & (b)
  • neither (a) nor (b)
0 h : 0 m : 1 s