Mechanical Engineering - Thermodynamics Questions and Answers

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Thermodynamics - Mechanical Engineering Multiple Choice Questions and Answers for Competitive exams, Interview and entrance exams.
1) Which of the following variables controls the physical properties of a perfect gas
  1. pressure
  2. temperature
  3. volume
  4. all of the above
  5. atomic mass
Show Answer
Answer = all of the above
2) Which qf the following laws is applicable for the behavior of a perfect gas
  1. Boyle's law
  2. Charles'law
  3. Gay-Lussac law
  4. all of the above
  5. Joule's law
Show Answer
Answer = all of the above
3) The unit of temperature in S.I. units is
  1. Centigrade
  2. Celsius
  3. Fahrenheit
  4. Kelvin
  5. Rankine
Show Answer
Answer = Kelvin
4) The unit of mass in S.I. units is
  1. kilogram
  2. gram
  3. tonne
  4. quintal
  5. newton
Show Answer
Answer = kilogram
5) The unit of time in S.I. units is
  1. second
  2. minute
  3. hour
  4. day
  5. year
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Answer = second
6) The unit of length in S.I. units is
  1. meter
  2. centimeter
  3. kilometer
  4. millimeter
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Answer = meter
7) The unit of energy in S.I. units is
  1. watt
  2. joule
  3. joule/s
  4. joule/m
  5. joule m
Show Answer
Answer = joule
8) According to GayLussac law for a perfect gas, the absolute pressure of given mass varies directly as
  1. temperature
  2. absolute
  3. absolute temperature, if volume is kept constant
  4. volume, if temperature is kept constant
  5. remains constant,if volume and temperature are kept constant
Show Answer
Answer = absolute temperature, if volume is kept constant
9) An ideal gas as compared to a real gas at very high pressure occupies
  1. more volume
  2. less volume
  3. same volume
  4. unpredictable behavior
  5. no such correlation
Show Answer
Answer = more volume
10) General gas equation is
  1. PV=nRT
  2. PV=mRT
  3. PV = C
  4. PV=KiRT
  5. Cp-Cv = Wj
Show Answer
Answer = PV=mRT

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