Practice Test: Question Set - 09
1. Absolute zero temperature signifies the
- (A) Minimum temperature attainable
- (B) Temperature of the heat reservoir to which a
Carnot engine rejects all the heat that is taken in
- (C) Temperature of the heat reservoir to which a Carnot engine rejects
no heat
- (D) None of these
2. Compressibility factor of a gas is
- (A) Not a function of its pressure
- (B) Not a function of its nature
- (C) Not a function of its temperature
- (D) Unity, if it follows PV = nRT
3. A gas performs the maximum work, when it expands
- (A) Non-uniformly
- (B) Adiabatically
- (C) Isobarically
- (D) Isothermally
4. Efficiency of a heat engine working on Carnot cycle between two temperature levels depends upon the
- (A) Two temperatures only
- (B) Pressure of working fluid
- (C) Mass of the working fluid
- (D) Mass and pressure both of the working fluid
5. Pick out the wrong statement.
- (A) The chemical potential of a pure substance depends upon the
temperature and pressure
- (B) The chemical potential of a component in a system is directly
proportional to the escaping tendency of that component
- (C) The chemical potential of ith species (μi)
in an ideal gas mixture approaches zero as the pressure or mole fraction (xi)
tends to be zero at constant temperature
- (D) The chemical potential of species 'i' in the mixture (μi)
is mathematically represented as,µi
= ∂(nG)/∂ni]T,P,nj where, n, ni and nj respectively
denote the total number of moles, moles of ith species and all mole
numbers except ith species. 'G' is Gibbs molar free energy
6. For a thermodynamic system containing 'x' chemical species, the maximum number of phases that can co-exist at equilibrium is
- (A) x
- (B) x + 1
- (C) x + 2
- (D) x + 3
7. Gibbs free energy of mixing at constant pressure and temperature is always
- (A) 0
- (B) ∞
- (C) + ve
- (D) - ve
8. At __________ point, all the three phases (i.e. solid, liquid and gas) co-exist.
- (A) Eutectic
- (B) Triple
- (C) Plait
- (D) Critical
9. For an incompressible fluid, the __________ is a function of both pressure as well as temperature.
- (A) Internal energy
- (B) Enthalpy
- (C) Entropy
- (D) All (a), (b) & (c)
10. Specific __________ does not change during a phase change (e.g. sublimation, melting, vaporization etc.).
- (A) Entropy
- (B) Internal energy
- (C) Enthalpy
- (D) Gibbs free energy
11. When dilute aqueous solutions of two salts are mixed, the process is associated with
- (A) Decrease in temperature
- (B) Increase in temperature
- (C) No change in temperature
- (D) Change in temperature which is a function of composition
12. Which of the following is Virial equation of state?
- (A) (p + a/V2)(V - b)
= nRT
- (B) PV = nRT
- (C) PV = A + B/V + C/V2 + D/V3 +
...
- (D) None of these
13. For a cyclic process, a fixed ratio between heat and work
- (A) Always exists
- (B) May exist
- (C) Never exists
- (D) Is difficult to predict
14. Joule-Thomson effect i.e., a throttling process is a constant __________ process.
- (A) Entropy
- (B) Temperature
- (C) Internal energy
- (D) Enthalpy
15. Equilibrium constant of a reaction varies with the
- (A) Initial concentration of the reactant
- (B) Pressure
- (C) Temperature
- (D) None of these
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