31. Which of the following gas is mostly used in town for street and domestic lighting and heating?
A. Producer gas
B. Coal gas
C. Mond gas
D. Coke oven gas
32. The value of the gas constant (R) in S. I. units is
A. 0.287 J/kgK
B. 2.87 J/kgK
C. 28.7 J/kgK
D. 287 J/kgK
33. In the first law of thermodynamics, the total energy of the system remains constant.
A. True
B. False
34. The efficiency of the Diesel cycle increases with
A. decrease in cut-off
B. increase in cut-off
C. constant cut-off
D. none of these
35. Coal gas is obtained by mixing coal and gas at ambient conditions.
A. Yes
B. No
36. 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
37. The kinetic energy of molecules of a gas becomes zero at absolute zero temperature.
A. Agree
B. Disagree
38. One kg of carbon monoxide requires __________ kg of oxygen to produce 11/7 kg of carbon dioxide gas.
A. All
B. 4/7
C. 11/4
D. 9/7
39. The absolute zero temperature is taken as
A. -273°C
B. 273°C
C. 237°F
D. -237°F
40. The specific heat of water is
A. 1.817
B. 2512
C. 4.187
D. none of these