Engineering Thermodynamics (3131905) MCQs

MCQs of First Law of Thermodynamics

Showing 11 to 20 out of 38 Questions
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11.

When the gas is cooled at constant pressure

(a)

its temperature increases but volume decreases
(b)

its volume increases but temperature decreases
(c)

both temperature and volume increases
(d)

both temperature and volume decreases
Answer:

Option (d)

12.

When gas is heated at constant pressure, the heat supplied is utilized in

(a)

increasing the internal energy of the gas
(b)

doing some external work
(c)

increasing the internal energy of gas and also for doing some external work
(d)

none of the above
Answer:

Option (c)

13.

An isothermal process is governed by

(a)

Boyle's law
(b)

Charles' law
(c)

Gay-Lussac law
(d)

Avogadro's law
Answer:

Option (a)

14.

A process, in which the temperature of the working substance remains constant during its expansion or compression, is called

(a)

isothermal process
(b)

hyperbolic process
(c)

adiabatic process
(d)

polytropic process
Answer:

Option (a)

15.

In an isothermal process

(a)

there is no change in temperature
(b)

there is no change in enthalpy
(c)

there is no change in internal energy
(d)

all of these
Answer:

Option (d)

16.

If in the equation pvn = C, the value of n = ∝ , then the process is called

(a)

constant volume process
(b)

adiabatic process
(c)

constant pressure process
(d)

isothermal process
Answer:

Option (a)

17.

When the expansion or compression takes place according to the law pvn = C, the process is known as

(a)

isothermal process
(b)

adiabatic process
(c)

hyperbolic process
(d)

polytropic process
Answer:

Option (d)

18.

The process is adiabatic, the value of n in the equation pvn = C is

(a)

0
(b)

1
(c)

γ
(d)

∝
Answer:

Option (c)

19.

If the value of n = 0 in the equation pvn = C, then the process is called

(a)

constant volume process
(b)

adiabatic process
(c)

constant pressure process
(d)

isothermal process
Answer:

Option (c)

20.

The general law of expansion or compression is pvn = C, the process is said to be isothermal, n is equal to

(a)

0
(b)

1
(c)

γ
(d)

∝
Answer:

Option (b)

Showing 11 to 20 out of 38 Questions
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