# Mechanical Engineering Thermodynamics mcq – Set 01

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(A) watt
(B) Joule
(C) joule/s
(D) joule/m

## Q2. According to Dalton’s law, the total pressure of the mixture of gases is equal to

(A) Greater of the partial pressures of all
(B) Average of the partial pressures of all
(C) Sum of the partial pressures of all
(D) Sum of the partial pressures of all divided by average molecular weight

## Q3. Superheated vapour behaves

(A) Exactly as gas
(B) As steam
(C) As ordinary vapour
(D) Approximately as a gas

## Q4. The specific heat of water is

(A) 2.512
(B) 1.817
(C) 4.187
(D) None of these

## Q5. The total energy of a molecule is shared equally by the various degrees of freedom possessed by it. This law is known as

(A) Law of equipartition of energy
(B) Law of degradation of energy
(C) Law of conservation of energy
(D) None of these

## Q6. The main cause for the irreversibility is

(A) Unrestricted expansion
(B) Mechanical and fluid friction
(C) Heat transfer with a finite temperature difference
(D) All of the above

## Q7. Which of the following can be regarded as gas so that gas laws could be applicable, within the commonly encountered temperature limits?

(A) O₂, N₂, steam, CO₂
(B) O₂, N₂, water vapour
(C) SO₂, NH₃, CO₂, moisture
(D) O₂, N₂, H₂, air

## Q8. Absolute zero pressure will occur

(A) At sea level
(B) When molecular momentum of the system becomes zero
(C) Under vacuum conditions
(D) At a temperature of 273°K

## Q9. According to which law, all perfect gases change in volume by 1/273th of their original volume at 0°C for every 1°C change in temperature when pressure remains constant

(A) Joule’s law
(B) Boyle’s law
(C) Gay Lussac’s law
(D) Charles’ law

(A) Volume
(B) Pressure
(C) Temperature
(D) Enthalpy

## Q11. Mond gas is obtained by

(A) Partial combustion of coal, coke, anthracite coal or charcoal in a mixed air steam blast
(B) Carbonisation of bituminous coal
(C) Passing steam over incandescent coke
(D) Passing air and a large amount of steam over waste coal at about 650°C

## Q12. The measurement of a thermodynamic property known as temperature is based on

(A) First law of thermodynamics
(B) Second law of thermodynamics
(C) Zeroth law of thermodynamics
(D) None of these

## Q13. No liquid can exist as liquid at

(A) 273°K
(B) Vacuum
(C) Zero pressure
(D) Centre of earth

## Q14. Gases have

(A) Only one value of specific heat
(B) Two values of specific heat
(C) No value of specific heat
(D) Under some conditions one value and sometimes two values of specific heat

## Q15. A perfect gas at 27°C is heated at constant pressure till its volume is double. The final temperature is

(A) 54°C
(B) 327°C
(C) 108°C
(D) 654°C

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