### Mcq on properties of pure substance - Questions and answers

Hello friends welcome in mechanical engineering mcq website. In this lecture we solveing the Thermodynamics (som) subject multiple choice questions Mcq on properties of pure substance - Questions and answers (objectives questions).

# Multiple choice questions Mcq on properties of pure substance - Questions and answers

 Mcq on properties of pure substance - Questions and answers

MCQ - 1
The mollier diagram between

A) Stress vs strain
B) Pressure vs  volume
C) Temperature vs entropy
D) Enthalpy vs entropy

MCQ - 2
Due to sensible heat temperature is ............

A) Change
B) Does not change
C) Can't say
D) None of these

MCQ - 3
Due to Laten heat temperature is ............

A) Change
B) Does not change
C) Can't say
D) None of these

MCQ - 4
Latent heat of steam with decreased in pressure

A) Decreased
B) Increased
C) Same
D) None of these

MCQ - 5
The Triple point point temperature of water is

A) 270.16 k
B) 273.16 k
C) 275.16 k
D) 277.16 k

MCQ - 6
The critical pressure of water is

A) 20 Mpa
B) 22.12 Mpa
C) 24.12 Mpa
D) 26.12 Mpa

MCQ - 7
The degree of freedom at critical point is

A) Zero
B) 0.5
C) One
D) Two

MCQ - 8
The critical temperature water is

A) 274.15 °c
B) 374.15 °c
C) 174.15 °c
D) 474.15 °c

MCQ - 9
When water is heated with rise (change) in temperature that heat is called  as.......

A) Sensible heat
B) Latent heat
C) Entropy
D) Enthalpy

MCQ - 10
When water is heated without rise (change) in temperature that heat is called  as.......

A) Sensible heat
B) Latent heat
C) Entropy
D) Enthalpy

MCQ - 11
At triple point for water which of the following properties does not equal to zero.

A) Entropy
B) Enthalpy
C) Pressure
D) internal energy

MCQ - 12
Triple point of pure substance is a point at which

A) liquid and vapour exist together
B) Solid and vapour exist together
C) Solid and vapour exist together
D) Solid ,liquid and vapor exist together

MCQ - 13
At a critical point saturated liquid line and saturated vapour line meet

A) True
B) False

MCQ - 14
The joule Thompson coefficient for aan ideal gas is ..........

A) Less than zero
B) zero
C) More than zero
D) one

Solution
The for a ideal gas joule Thompson coefficient value is zero because ideal gas is neither expanding at cooled or warm conditions

MCQ - 15
At triple point internal energy becomes............

A) zero
B) 0.5
C) one
D) Two

MCQ - 16
At Critical point of  value of Vg - Vf is

A) zero
B) one
C) Two
D) Infinite

MCQ - 17
The process of sublimation occurs in case of

A) Solid oxygen
B) Solid carbon dioxide
C) Liquid Nitrogen
D) Air

MCQ - 18
The dryness fraction of superheater steam is takes as

A) x = 0
B) x = 0.5
C) x = 1
D) x = 2

MCQ - 19
At triple point entropy becomes............

A) zero
B) 0.5
C) one
D) Two

MCQ - 20
The dryness fraction at saturated vapours line is takes as

A) x = 0
B) x = 0.5
C) x = 1
D) x = 2

MCQ - 21
The dryness fraction on saturated liquid line is takes as

A) x = 0
B) x = 0.5
C) x = 1
D) x = 2

MCQ - 22
The critical specific volume  of water is

A) 0.317 m³ / kg
B) 0.0317 m³ / kg
C) 0.00317 m³ / kg
D) 0.000317 m³ / kg

MCQ - 23
The degree of freedom at Tripple point is

A) Zero
B) 0.5
C) One
D) Two

MCQ - 24
The Tripple point temperature water is

A) 273.15 °c
B) 373.15 °c
C) 173.15 °c
D) 473.15 °c

MCQ - 25
Triple point on t-s diagram is

A) liquid and vapour exist together
B) Solid and vapour exist together
C) Solid and vapour exist together
D) Solid ,liquid and vapor exist together