# Thermodynamics Questions and Answers – Work Transfer

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This set of Thermodynamics Multiple Choice Questions & Answers (MCQs) focuses on “Work Transfer”.

1. The magnitude of mechanical work is the
a) product of the force and distance travelled perpendicular to the force
b) product of the force and distance travelled parallel to the force
c) sum of the force and distance travelled perpendicular to the force
d) sum of the force and distance travelled parallel to the force

Explanation: The work is done by a force as it acts upon a body moving in the direction of the force.

2. Work done by a system is taken to be
a) positive
b) negative
c) zero
d) varies according to situation

Explanation: In thermodynamics, work done by a system is take to be positive.

3. Work done on a system is taken to be
a) positive
b) negative
c) zero
d) varies according to situation

Explanation: In thermodynamics, work done on a system is take to be negative.
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4. Work is a
a) point function
b) path function
c) depends on the state
d) none of the mentioned

Explanation: Amount of work done depends on the path the system follows.

5. Thermodynamic properties are
a) point function
b) path function
c) depends on the state
d) none of the mentioned

Explanation: For a given state there is a definite value for each property.

6. The differentials of point functions are
a) perfect differentials
b) exact differentials
c) all of the mentioned
d) none of the mentioned

Explanation: Change in thermodynamic property is independent of path and depends only on initial and final states of the system.

7. In the equation dV=(1/p)dW, (1/p) is known as
a) volume factor
b) pressure factor
c) differential factor
d) integration factor

Explanation: Used to convert inexact differential dW into exact differential dV.

8. Cyclic integral of a property is always
a) zero
b) one
c) infinite value
d) none of the mentioned

Explanation: The initial and final states of the system for a cyclic process are the same.

9. Constant pressure process is also known as
a) isopiestic process
b) isobaric process
c) all of the mentioned
d) none of the mentioned

Explanation: Isobaric and isopiestic means pressure being constant.

10. Work done in a quasi-static process
a) depends on the path followed
b) independent of the path followed
c) depends only on the initial and final states
d) none of the mentioned

Explanation: This is because work done is a path function.

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