# Practice Test: Question Set - 25

1. Those substances which have so far not been resolved by any means into other substances of simpler form are called
(A) Elements
(B) Compounds
(C) Atoms
(D) Molecules

2. The most probable velocity of the gas molecules is given by
(A) √(KT/m)
(B) √(2KT/m)
(C) √(3KT/m)
(D) √(5KT/m)

3. The sum of internal energy (U) and the product of pressure and volume (p.v) is known as
(A) Work-done
(B) Entropy
(C) Enthalpy
(D) None of these

4. The state of a substance whose evaporation from its liquid state is complete, is known as
(A) Vapour
(B) Perfect gas
(C) Air
(D) Steam

5. The root mean square velocity of the gas molecules is given by (where k = Boltzmann's constant, T = Absolute temperature, and m = Mass of one molecule of a gas)
(A) √(KT/m)
(B) √(2KT/m)
(C) √(3KT/m)
(D) √(5KT/m)

6. When a perfect gas is expanded through an aperture of minute dimensions, the process is known as
(A) Isothermal process
(C) Free expansion process
(D) Throttling process

7. A process, in which the working substance neither receives nor gives out heat to its surroundings during its expansion or compression, is called
(A) Isothermal process
(B) Hyperbolic process
(D) Polytropic process

8. The ratio of specific heat at constant pressure (cp) and specific heat at constant volume (cv) is always __________ one.
(A) Equal to
(B) Less than
(C) Greater than
(D) None of these

9. Select the correct statement as per Charles' law
(A) p.v = constant, if T is kept constant
(B) v/T = constant, if p is kept constant
(C) p/T = constant, if v is kept constant
(D) T/p = constant, if v is kept constant

10. A close cycle gas turbine gives __________ efficiency as compared to an open cycle gas turbine.
(A) Same
(B) Lower
(C) Higher
(D) None of these

11. According to Avogadro's law, the density of any two gases is __________ their molecular masses, if the gases are at the same temperature and pressure.
(A) Equal to
(B) Directly proportional to
(C) Inversely proportional to
(D) None of these

12. During which of the following process does heat rejection takes place in Carnot cycle?
(A) Isothermal expansion
(B) Isentropic expansion
(C) Isothermal compression
(D) Isentropic compression

13. A tri-atomic molecule consists of __________ atoms.
(A) One
(B) Two
(C) Three
(D) Four

14. Which of the following has the minimum atomic mass?
(A) Oxygen
(B) Sulphur
(C) Nitrogen
(D) Carbon

15. The mass of carbon per kg of flue gas is given by
(A) (11/3) CO2 + (3/7) CO
(B) (3/7) CO2 + (11/3) CO
(C) (7/3) CO2 + (3/11) CO
(D) (3/11) CO2 + (7/3) CO

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