61. The isothermal and isentropic processes are reversible non-flow processes.
Agree
Disagree
✅ The correct answer is option A.
Thermodynamics MCQs
62. When a fluid is allowed to expand suddenly into a vaccum chamber through an orifice of large dimensions, the process is known as free expansion process.
TRUE
FALSE
✅ The correct answer is option A.
63. All perfect gases change in volume by 1 / 273th of its original volume at 0°C for every 1°C change in temperature, when the pressure remains constant. This statement is called
Boyle’s law
Charles’ law
Gay-Lussac law
Joule’s law
✅ The correct answer is option B.
64. When a perfect gas is expanded through an aperture of minute dimensions, the process is known as
isothermal process
adiabatic process
free expansion process
throttling process
✅ The correct answer is option D.
65. The heat flows from a cold body to a hot body with the aid of an external source. This statement is given by
Kelvin
Joule
Clausis
Gay-Lussac
✅ The correct answer is option C.
67. The specific heat at constant volume is
the amount of heat required to raise the temperature of unit mass of gas through one degree, at constant pressure
the amount of heat required to raise the temperature of unit mass of gas through one degree, at constant volume
the amount of heat required to raise the temperature of 1 kg of water through one degree
any one of the above
✅ The correct answer is option B.
68. The increase in entropy of a system represents
increase in availability of energy
increase in temperature
decrease in pressure
degradation of energy
✅ The correct answer is option D.
69. The throttling process is __________ process.
reversible
irreversible
reversible or irreversible
✅ The correct answer is option B.
70. The heating of a gas at constant pressure is governed by Charles’ law.
TRUE
FALSE
✅ The correct answer is option A.