Engineering Thermodynamics (3131905) MCQs

MCQs of First Law of Thermodynamics

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1.

The first law of thermodynamics furnishes the relation between

(a)

heat and work
(b)

heat, work, and property of the system
(c)

various properties of the system
(d)

various thermodynamic processes
Answer:

Option (b)

2.

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

(a)

Boyle
(b)

Charles
(c)

Joule
(d)

none of these
Answer:

Option (c)

3.

Which of the following is true for a steady flow system?

(a)

Mass entering = mass leaving
(b)

Mass does not enter or leave the system
(c)

Mass entering can be more or less than the mass leaving
(d)

None of the mentioned
Answer:

Option (a)

4.

During the throttling process enthalpy

(a)

remains constant
(b)

decreases
(c)

increases
(d)

may increase or decrease
Answer:

Option (a)

5.

A device that violates the conservation law of energy is called a 

(a)

Perpetual Motion Machine of the second kind
(b)

Perpetual Motion Machine of the first kind
(c)

Perpetual Motion Machine of the third kind
(d)

None of these
Answer:

Option (b)

6.

The first law of thermodynamics deals with

(a)

conservation of heat
(b)

conservation of momentum
(c)

conservation of mass
(d)

conservation of energy
Answer:

Option (d)

7.

According to First law of thermodynamics,

(a)

total internal energy of a system during a process remains constant
(b)

total energy of a system remains constant
(c)

workdone by a system is equal to the heat transferred by the system
(d)

internal energy, enthalpy and entropy during a process remains constant
Answer:

Option (b)

8.

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

(a)

Boyle
(b)

Charles
(c)

Joule
(d)

none of these
Answer:

Option (c)

9.

A mixture of gas expands from 0.03 m3 to 0.06 m3 at a constant pressure of 1 MPa and absorbs 84 kJ of heat during the process. The change in internal energy of the mixture is

(a)

30 kJ
(b)

54 kJ
(c)

84 kJ
(d)

114 kJ
Answer:

Option (b)

10.

When a gas is heated at a constant volume

(a)

its temperature will increase
(b)

its pressure will increase
(c)

both temperature and pressure will increase
(d)

neither temperature nor pressure will increase
Answer:

Option (c)

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