Hydraulics Fluid Mechanics top Mcq

 

1. The mass per unit volume of a liquid at a standard temperature and pressure is called ?

A) Specific weight
B) mass density
C) specific gravity
D) none of these

ANSWER= (b) mass density
Explain:-

 

2. The volume per unit mass of liquid is called specific volume ?

A) Yes
B) No

ANSWER= (A) Yes
Explain:-

 

3. The weight per unit volume of liquid at a standard temperature and pressure is called?

A) Specific weight
B) mass density
C) specific gravity
D) none of these

ANSWER= (A) Specific weight

 

4. The ratio of specific weight of liquid to the specific weight of water at a standard temperature is called ?

A) density of liquid
B) specific gravity of liquid
C) compressibility of liquid
D) surface tension of liquid

ANSWER= (B) specific gravity of liquid

 

5. The specific gravity has no unit is?

A) Agree
B) Disagree

ANSWER= (A) Agree

 

6. The specific gravity of water is taken as ?

A) 0.001
B) 0.01
C) 0.1
D) 1

ANSWER= (D) 1

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7. The specific weight of sea water ------ that of pure water is ?

A) same as
B) less than
C) more than

ANSWER= (C) more than

 

8. They density of a liquid in kg/m3 is numerically equal to its specific gravity ?

A) True
B) False

ANSWER= (A) True

 

9. The specific weight is also known as weight density ?

A) True
B) False

ANSWER= (A) True

 

10. The mass of 2.5 m3 of a certain liquid is 2 tonnes.Its mass density is ?

A) 200 kg/m3
B) 400 kg/m3
C) 600 kg/m3
D) 800 kg/m3

ANSWER= (A) 800 kg/m3

 

11. The specific gravity of an oil whose specific weight is 7.85 KN2 /m3, is ?

A) 0.8
B) 1
C) 1.2
D) 1.6

ANSWER= (A) 0.8

 

12. The vessel of 4 m3 contains an oil which weights 30KN. The specific weight of the oil is ?

A) 4.5kN/m3
B) 6kN/m3
C) 7.5kN/m3
D) 10KN/m3

ANSWER= (C) 7.5kN/m3

 

13. The property of liquid which offers resistance to the movement of one layer of liquid over another adjacent layer of liquid, is called?

A) surface tension
B) compressibility
C) capillarity
D) viscosity

ANSWER= (D) viscosity
Explain:-

 

14. Kinematic viscosity is the product of dynamic viscosity and the density of the liquid?

A) Yes
B) No
C) Unknown
D) none of the mentioned

ANSWER= (B) No
Explain:-

 

15. The force per unit length is the unit of ?

A) Surface tension
B) compressibility
C) capillary
D) viscosity

ANSWER= (A) Surface tension
Explain:-

 

16. The variation in volume of a liquid with the variation of pressure is called its ?

A) Surface tension
B) Compressibility
C) Capillarity
D) Viscosity

ANSWER= B) Compressibility
Explain:-

 

17. The property of a fluid which enables it to resist tensile stress is known as?

A) Surface tension
B) Compressibility
C) cohesion
D) Viscosity

ANSWER= C) cohesion
Explain:-

 

18. When a tube of smaller diameter is dipped in water, the water rises in the tube due to viscosity of water ?

A) True
B) False

ANSWER= False
Explain:-

 

19. When a tube of smaller diameter is dipped in water, the water rises in the tube with an upward ?

A) concave
B) convex

ANSWER= A) concave
Explain:-

 

20. A glass tube of smaller diameter is used while performing an experiment for the capillary rise of water because?

A) It is easier to see through the glass tube
B) Glass tube is cheaper than a metallic tube
C) It is not possible to conduct this experiment with any other tube
D) All of the above

ANSWER= A) It is easier to see through the glass tube
Explain:-