Thermodynamics - Mechanical Engineering Multiple Choice Questions and Answers

1.    Which of the following variables controls the physical properties of a perfect gas
(a) pressure
(b) temperature
(c) volume  
(d) all of the above
(e) atomic mass.
Ans: d

2.    Which qf the following laws is applicable for the behavior of a perfect gas
(a) Boyle's law    
(b) Charles'law
(c) Gay-Lussac law
(d) all of the above
(e) Joule's law.
Ans: d

3.    The unit of temperature in S.I. units is
(a) Centigrade    
(b) Celsius
(c) Fahrenheit      
(d) Kelvin
(e) Rankine.
Ans: d

4.    The unit of mass in S.I. units is
(a) kilogram  
(b) gram
(c) tonne              
(d) quintal
(e) newton.
Ans: a

5.    The unit of time in S.I. units is
(a) second  
(b) minute
(c) hour              
(d) day
(e) year.
Ans: a

6.    The unit of length in S.I. units is
(a) meter  
(b) centimeter
(c) kilometer      
(d) millimeter.
Ans: a

7.    The unit of energy in S.I. units is
(a) watt  
(b) joule
(c) joule/s  
(d) joule/m
(e) joule m.
Ans: b

8.    According to GayLussac law for a perfect gas, the absolute pressure of given mass varies directly as
(a)     temperature    
(b)     absolute
(c)    absolute temperature, if volume is kept constant
(d)    volume, if temperature is kept constant
(e)    remains constant,if volume and temperature are kept constant.
Ans: c

9.    An ideal gas as compared to a real gas at very high pressure occupies
(a)     more volume  
(b)     less volume
(c)    same volume
(d)    unpredictable behavior
(e)    no such correlation.
Ans: a

10.    General gas equation is
(a) PV=nRT      
(b) PV=mRT
(d) PV = C
(c) PV=KiRT
(e) Cp-Cv = Wj
Ans: b

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