Q.1

If an ideal solution is formed by mixing two pure liquids in any proportion, then the __________ of mixing is zero.

  • enthalpy
  • volume
  • both 'a' & 'b'
  • neither 'a' nor 'b'
Q.2

Internal energy of an element at 1 atm andC is __________ kcal/kg.mole.

  • 0
  • 273
  • 25
  • none of these
Q.3

Number of degrees of freedom for a three phase system in equilibrium comprising of three non-reacting chemical species is

  • 2
  • 0
  • 1
  • 3
Q.4

What is the number of degrees of freedom for liquid water in equilibrium with a mixture of nitrogen and water vapor ?

  • 2
  • 0
  • 3
  • 1
Q.5

The value of gas constant 'R' is

  • 1.987 cal/gm mole °K
  • 1.987 BTU/lb. mole °R
  • both (a) and (b)
  • neither (a) nor (b)
Q.6

The expression, nCv(T2 - T1), is for the __________ of an ideal gas.

  • work done under adiabatic condition
  • co-efficient of thermal expansion
  • compressibility
  • none of these
Q.7

The number of degrees of freedom at the triple point of water is

  • 0
  • 1
  • 2
  • 3
Q.8

In an irreversible process

  • Tds = dE - dW = 0
  • dE - dW - Tds = 0
  • Tds - dE + dW< 0
  • Tds - dT + dW< 0
Q.9

The temperature at which a real gas obeys the ideal gas laws over a wide range of pressure is called the __________ temperature.

  • critical
  • Boyle
  • inversion
  • reduced
Q.10

Critical solution temperature (or the con-solute temperature) for partially miscible liquids (e.g., phenol-water) is the minimum temperature at which

  • a homogeneous solution (say of phenol water) is formed.
  • mutual solubility of the two liquids shows a decreasing trend.
  • two liquids are completely separated into two layers.
  • none of these.
Q.11

Generation of heat by friction is an example of a/an __________ change.

  • isothermal
  • irreversible
  • adiabatic
  • reversible
Q.12

In an ideal refrigeration cycle, the change in internal energy of the fluid is

  • +ve
  • -ve
  • 0
  • either of the above three ; depends on the nature of refrigerant.
Q.13

Which of the following is a widely used refrigerant in vapour compression refrigeration system (using large centrifugal compressor)?

  • Freon
  • Liquid sulphur dioxide
  • Methyl chloride
  • Ammonia
Q.14

Which of the following liquid metals has the highest thermal conductivity ?

  • Molten sodium
  • Molten lead
  • Mercury
  • Molten potassium
Q.15

What is the number of degree of freedom for a system of two miscible non-reacting species in vapor-liquid equilibrium forming an azeotrope ?

  • 3
  • 2
  • 1
  • 0
Q.16

The value of Joule-Thomson co-efficient, in case where cooling occurs after the throttling process is

  • 0
  • ∞
  • +ve
  • -ve
Q.17

If the molar heat capacities (Cp or Cv) of the reactants and products of a chemical reaction are identical, then, with the increase in temperature, the heat of reaction will

  • increase
  • decrease
  • remain unaltered
  • increase or decrease ; depends on the particular reaction
Q.18

Number of components (C), phase (P) and degrees of freedom (F) are related by Gibbs phase rule as

  • P + F - C = 2
  • C = P - F + 2
  • F = C - P - 2
  • P = F - C - 2
Q.19

__________ equation predicts the activity co-efficient from experimental data.

  • Lewis-Randall
  • Margules
  • Van Laar
  • both(b)&(c)
Q.20

A domestic refrigerator has a/an __________ cooled condenser.

  • water
  • air
  • evaporative
  • gas
Q.21

For an irreversible process involving only pressure-volume work

  • (dF)T, p <0
  • (dF)T, p = 0
  • (dF)T, p > 0
  • (dA)T, v >0
Q.22

Free energy

  • decreases in all spontaneous (or irreversible) processes.
  • change during a spontaneous process has a negative value.
  • remains unchanged in reversible processes carried at constant temperature and pressure.
  • all (a), (b) and (c).
Q.23

Gibbs free energy of a pure fluid approaches __________ as the pressure tends to zero at constant temperature.

  • infinity
  • minus infinity
  • zero
  • none of these
Q.24

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

  • constant volume
  • polytropic
  • adiabatic
  • constant pressure
Q.25

The equation, Cp - Cv = R, is true for __________ gas.

  • no
  • any real
  • only ideal
  • both (b) and (c)
Q.26

Gibbs free energy at constant pressure and temperature under equilibrium conditions is

  • ∞
  • 0
  • maximum
  • minimum
Q.27

Critical compressibility factor for all substances

  • are more or less constant (vary from 0.2 to 0.3).
  • vary as square of the absolute temperature.
  • vary as square of the absolute pressure.
  • none of these.
Q.28

Which of the following has the least thermal efficiency ?

  • Steam engine
  • Carnot engine
  • Diesel engine
  • Otto engine
Q.29

The entropy change in a reversible isothermal process, when an ideal gas expands to four times its initial volume is

  • R loge 4
  • R log10 4
  • Cv log10 4
  • Cv loge 4
Q.30

Adiabatic compression of a saturated water vapour makes it

  • supersaturated
  • superheated
  • both (a) and (b)
  • neither (a) nor (b)
Q.31

All gases above its inversion temperature, in a throttling process will show

  • a heating effect.
  • no change in temperature.
  • a cooling effect.
  • either (a) or (c).
Q.32

The value of Cp & Cv respectively for monoatomic gases in Kcal/kg Mole . °K are

  • 5 & 3
  • 3.987 & 1.987
  • 1.987 & 0.66
  • 0.66 & 1.987
Q.33

Enthalpy 'H' is defined as

  • H = E - PV
  • H = F - TS
  • H - E = PV
  • none of these
Q.34

The extensive properties are

  • volume, mass and number of moles.
  • free energy, entropy and enthalpy.
  • both (a) and (b).
  • none of these.
Q.35

Free energy change of mixing two liquid substances is a function of the

  • concentration of the constituents only.
  • quantities of the constituents only.
  • temperature only.
  • all (a), (b) and (c).
Q.36

Ideal refrigeration cycle is

  • same as Carnot cycle.
  • same as reverse Carnot cycle.
  • dependent on the refrigerant's properties.
  • the least efficient of all refrigeration processes.
Q.37

"If different processes are used to bring about the same chemical reaction, the enthalpy change is same for all of them". This is __________ law.

  • Hess's
  • Kirchoff's
  • Lavoisier and Laplace
  • none of these
Q.38

For a given substance at a specified temperature, activity is __________ to fugacity.

  • directly proportional
  • inversely proportional
  • equal
  • none of these
Q.39

A system undergoes a change from a given initial state to a given final state either by an irreversible process or by a reversible process, then(where, Δ S1 and Δ SR are the entropy changes of the system for the irreversible and reversible processes respectively)

  • Δ S1 is always < Δ SR
  • Δ S1 is sometimes > Δ SR
  • Δ S1 is always > Δ SR
  • Δ S1 is always = Δ SR
Q.40

Specific volume of an ideal gas is

  • equal to its density.
  • the reciprocal of its density.
  • proportional to pressure.
  • none of these.
Q.41

As the entropy of the universe is increasing, day by day, the work producing capacity of a heat engine is

  • not changed
  • decreasing
  • increasing
  • data sufficient, can't be predicted
Q.42

The first law of thermodynamics is a restatement of the law of conservation of

  • mass
  • energy
  • momentum
  • none of these
Q.43

In a homogeneous solution, the activity co-efficient of a component depends upon the

  • pressure
  • composition
  • temperature
  • all (a), (b) and (c)
Q.44

With increase in pressure (above atmospheric pressure), the Cp of a gas

  • increases
  • decreases
  • remains unchanged
  • first decreases and then increases
Q.45

What is the degree of freedom for two mis-cible (non-reacting) substances in vapor-liquid equilibrium forming an azeotrope ?

  • 0
  • 1
  • 2
  • 3
Q.46

If the internal energy of an ideal gas decreases by the same amount as the work done by the system, then the

  • process must be isobaric.
  • temperature must decrease.
  • process must be adiabatic.
  • both (b) and (c).
Q.47

Joule-Thomson Co-efficient at any point on the inversion curve is

  • ∞
  • + ve
  • 0
  • -ve
Q.48

PVγ = Constant (where, γ = Cp/Cv) is valid for a/an __________ process.

  • isothermal
  • isentropic
  • isobaric
  • adiabatic
Q.49

Claude gas liquefaction process employs cooling

  • at constant pressure.
  • by throttling.
  • by expansion in an engine.
  • none of these.
Q.50

The specific heat of saturated water vapour at 100°C is

  • ∞
  • -ve
  • 0
  • +ve
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