# Practice Test: Question Set - 06

1. In an isothermal process, the internal energy of gas molecules
(A) Increases
(B) Decreases
(C) Remain constant
(D) May increase/decrease depending on the properties of gas

2. When cut-off ratio is ________; the efficiency of Diesel cycle approaches to Otto cycle efficiency
(A) 1/4
(B) Zero
(C) 1/5
(D) 2

3. Zeroth law of thermodynamics
(A) Deals with conversion of mass and energy
(B) Deals with reversibility and irreversibility of process
(C) States that if two systems are both in equilibrium with a third system, they are in thermal equilibrium with each other
(D) Deals with heat engines

4. If a certain amount of dry ice is mixed with same amount of water at 80°C, the final temperature of mixture will be
(A) 80°C
(B) 0°C
(C) 40°C
(D) 20°C

5. The basis for measuring thermodynamic property of temperature is given by
(A) Zeroth law of thermodynamics
(B) First law of thermodynamics
(C) Second law of thermodynamics
(D) Third law of thermodynamics

6. An open cycle gas turbine works on
(A) Otto cycle
(B) Carnot cycle
(C) Joule's cycle
(D) Stirling cycle

7. Which of the following has the highest calorific value?
(A) Anthracite coal
(B) Bituminous coal
(C) Peat
(D) Lignite

8. One watt is equal to
(A) 1 Nm/s
(B) 1 N/m
(C) 1 Nm/hr
(D) 1 kNm/hr

9. Work done is zero for the following process
(A) Constant volume
(B) Free expansion
(C) Throttling
(D) All of the above

10. For which of the following substances, the gas laws can be used with minimum error
(A) Dry steam
(B) Wet steam
(C) Saturated steam
(D) Superheated steam

11. In a no flow reversible process for which p = (3V + 15) × 105 N/m², V changes from 1 m3 to 2 m3. The work done will be about
(A) 100 × 10⁵ joules
(B) 1 × 10⁵ joules
(C) 10 × 10⁵ joules
(D) 10 × 10⁵ kilo joules

12. An isothermal process is governed by
(A) Gay-Lussac law
(B) Charles' law
(C) Boyle's law

13. One kg of carbon requires 4/3 kg of oxygen and produces ________ kg of carbon monoxide gas.
(A) 8/3
(B) 7/3
(C) 11/7
(D) 11/3

14. The value of the product of molecular weight and the gas characteristic constant for all the gases in M.K.S. unit is
(A) 29.27 kgfm/mol °K
(B) 8314 kgfm/mol °K
(C) 848 kgfm/mol °K
(D) 427 kgfm/mol °K

15. On volume basis, air contains following parts of oxygen
(A) 21
(B) 23
(C) 25
(D) 77

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