# Thermodynamics : Important MCQs | set 1 – Mechanicaltalks

Thermodynamics : Important MCQs

Here are top 20 important MCQs of Thermodynamics. Read the questions carefully and try to answer all of them from your own.

Q1. A definite area or a space where some thermodynamic process takes place is known as

a) thermodynamic system

b) thermodynamic cycle

c) thermodynamic process

d) thermodynamic law

Q2. Which of the following is the extensive property of a thermodynamic system

a) pressure

b) volume

c) temperature

d) density

Q3. Which of the following is an intensive property of a thermodynamic system

a) volume

b) temperature

c) mass

d) energy

Q4. The absolute zero temperature is taken as

a) 273°C

b) -273°C

c) 100°C

d) 0°C

Q5. The standard value of atmospheric pressure taken at sea level is

a) 1.013 bar

b) 760 mm of Hg

c) 1013 × 10^2 N/m^2

d) all of these

Q6. 1 kilowatt (kw) is equal to

a) 1 Nm/s

b) 100 Nm

c) 1000 Nm/s

d) 10000 Nm/s

Q7. The specific heat of water is

a) 1.817

b) 2.512

c) 4.187

d) none of these

Q8. The heat and mechanical work are mutually convertible. This statement was established by

a) Boyle

b) Charles

c) Joule

d) none of these

Q9. First law of thermodynamics deals with

a) conservation of heat

b) conservation of momentum

c) conservation of mass

d) conservation of energy

Q10. Kelvin – Planck’s law deals with

a) conservation of work

b) conservation of heat

c) conservation of heat into work

d) conservation of work into heat

Q11. The heat flows from a cold body to a hot body with the aid of an external source. This statement is given by

a) Kelvin

b) Joule

c) Clausius

d) Gay – Lussac

Q12. Second law of thermodynamics defines

a) heat

b) work

c) internal energy

d) entropy

Q13. The state of a substance whose evaporation from its liquid state is complete is known as

a) vapour

b) perfect gas

c) air

d) steam

Q14. The behaviour of super heated vapour is similar to that of

a) perfect gas

b) air

c) steam

d) ordinary gas

Q15. The molecular mass expressed in gram of all gases, at N.T.P., occupies a volume of

a) 0.224 litres

b) 2.24 litres

c) 22.4 litres

d) 224 litres

Q16. Which of the following gas has a minimum molecular mass

a) Oxygen

b) Nitrogen

c) Hydrogen

d) Methane

Q17. The sum of internal energy and the product of pressure and volume is known as

a) workdone

b) entropy

c) enthalpy

d) none of these

Q18. The process occuring in open system which permit the transfer of mass to and from the system, are known as

a) flow processes

b) non – flow processes

d) none of these

Q19. Which of the following is a reversible non – flow process

a) Isochoric process

b) Isobaric process

c) Hyperbolic process

d) all of these

Q20. The heat energy stored in the gas and used for raising the temperature of the gas is known as

a) external energy

b) internal energy

c) kinetic energy

d) molecular energy

That was the set 1 of top important MCQs of Thermodynamics. This will help a lot for the competitive examinations. If you like this content then do share this with your well wishers. If you have any doubts regarding any mechanical engineering then let us know in comment section or contact us through email.