# Mcq on properties of pure substances

The Mechanical engineering, is plays very important trade in today's Technology that Assist you to do much things with ease, so let's learn about Concept Mcq on properties of pure substances that would helps to standardized our society with great knowledge. Mcq on properties of pure substances

1. Pure substances is one that having homogeneous and invariable chemical composition.
A. True
B. False

2. The point at which the slope changes from positive to negative at this point the slope is....
A. Maximum
B. Minimum
C. Zero
D. Can't be determined

3. Air is best example of pure substance.
A. True
B. False

4. All thermodynamic properties of liquid and vapour phases are identical at the critical point.
A. True
B. False

5. The value of pressure at a critical point is in bar...
A. 223.5 bar
B. 212.15 bar
C. 221.2 bar
D. 235.5 bar

6. At the critical point the temperature of water is in °C
A. 234.8 °C
B. 374.15 °C
C. 342.5 °C
D. 354.2 °C

7. The Gibbs phase rule providing a relationship between the degree of freedom of a system, the number of phases and the number of component of system.
A. True
B. False

8. Which of the following is a correct representation of Gibbs phase rule.
A. F+P-C = 2
B. F+C = P+2
C. F+P = C+2
D. P+F = C-2

9. The dryness fraction is defined as mass of vapour divided by mass of mixture.
A. True
B. False

10. The wetness fraction is which of the following..
A. 1+ dryness fraction
B. 1- dryness fraction
C. 1÷ dryness fraction
D. None of the above

11. What is the value of volume at critical point in cubic meter per kilogram.
A. 0.000317 m3/kg
B. 0.00317 m3/kg
C. 0.0317 m3/kg
D. 0.317 m3/ kg

12. The point which exists in solid, liquid and vapour phase is called as triple point.
A. True
B. False

13. The value of a specific entropy at a triple point is...
A. Maximum
B. Minimum
C. Zero
D. Can't be determined

14. The only water antimony and Bismuth substances having negative (-ve) slope of fusion line and all the remaining substances having positive(+) slope.
A. True
B. False

15. With the decrease in pressure the latent heat of steam is....
A. Decreases
B. Increase
C. Constant
D. Increases or decreases

16. The internal energy is zero at the triple point.
A. True
B. False

17. With  increases in pressure, there is a decrease in Vg-Vf and at critical point its value becomes zero is true or false
A. True
B. False

18. For a triple point of water the degree of freedom is...
A. 0
B. 1
C. 2
D. 3

19. For a triple point the entropy is non zero.
A. True
B. False

20. Beyond the critical temperature it is called as........ Gas
A. Subheated
B. Superheated
C. Critical
D. None of the above

21. Constant pressure lines in the superheated region in the mollier diagram will having...
A. Positive slope
B. Negative slope
C. Zero slope
D. Both A and B

22. In mollier diagram the lines of constant dryness fraction are parallel to saturation lines.
A. True
B. False

23. In mollier diagram the constant volume lines are steeper than constant pressure lines.
A. True
B. False

24. Throttling calorimeter is a device can used to measure the quality of wet steam.
A. True
B. False

25. Throttling calorimeter is based on the principle of.....
A. Joule curve expansion
B. Joule - Thomson expansion
C. Constant volume expansion
D. None of the above

Here we concluding, If you have any queries about the Mcq on properties of pure substances then feel free to comment below.

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