# Thermodynamics Mcqs

This set of Engineering Multiple Choice Questions & Answers (MCQs) focuses on “ Thermodynamics ”. These Mcqs are chosen from a collection of most authoritative and best reference books on Chemical Engineering. Our aim is to prepare an individual for competitive exams like NTS, GAT, ECAT, University and College entrance exams, Jobs and interviews. One should practice our MCQS to assimilate Thermodynamics comprehensively.

Power

Work

Entropy

Pressure

W only

J/s only

J/s and W both

J

3.6 x 108 J

3.6 x 106 J

3.6 x 107 J

3.6 x 105 J

J/s

J

W

N

1 N/m2

105 N/m2

133.32 N/m2

104 N/m2

## 6. Torr is equal to the pressure of

0.1 mm of Hg at 0?C in a standard gravitational field

1 mm of Hg at 0?C in a standard gravitational field

0.01 mm of Hg at 0?C in a standard gravitational field

0.001 mm of Hg at 0?C in a standard gravitational field

## 7. Which of the following is / are thermometric property (ies)?

Pressure of a gas kept at constant-volume

Volume of a gas kept at constant-pressure

Thermal emf of a thermocouple

All of the above

## 8. First law of thermodynamics is based on the

Law of conservation of mass

Law of conservation of energy

Law of equipartion of energy

Law of conservation of momentum

DU = ?dQ + dW

DU = dQ + dW

DU = dQ-dW

DU = Q + W

? H = Q + Ws

?H = Q-Ws

?U = Q-Ws

?U = Q + Ws

## 11. A control volume refers to

Fixed region is space

A difinite mass

A closed system

An isolated system

Open system

Closed system

Isolated system

Insulated system

## 13. An open system implies

The use of a control volume

No interchange between system and surroundings

The presence of free surface

That a definite mass of material is considered

## 14. A system is called open system if

Only the energy crosses the system boundary

Both energy and mass cross the system boundary

Neither energy nor mass crosses the system boundary

Only the mass crosses the system boundary

## 15. A system is said to be an isolated system if

Only the mass crosses the system boundary

Only the energy crosses the system boundary

Both energy and mass crosses the system boundary

Neither energy nor mass crosses the system boundary

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