Fluid Mechanics MCQ
Unit 1 - Fluids and Their Properties
1. The branch of Engineering-science, which deals with water at rest or in
motion is called
(a) hydraulics
(b) Fluid mechanics
(c) Applied mechanics
(d) Kinematics.
Answer A
2. A solid can resist which of the following stresses?
(a) Tensile
(b) Compressive
(c) Shear
(d) All of the above.
Answer D
3. .......... possesses no definite volume and is compressible.
(a) Solid
(b) Liquid
(c) Gas
(d) Vapour.
Answer C
4. A real practical fluid possesses which of the following?
(a) Viscosity
(b) Surface tension
(c) Compressibility
(d) Density
(e) All of the above
Answer E
5. The ratio of the specific weight of the liquid to the specific weight of a standard fluid
is known as
(a) Specific volume
(b) Weight density
(c) Specific gravity
(d) Viscosity.
Answer C
6. The property of a fluid which determines its resistance to shearing
stress is called
(a) Viscosity
(b) Surface tension
(c) Compressibility
(d) None of the
above.
Answer A
8. Fluids which do not follow the linear relationship between shear stress and rate of
deformation are termed as.... fluids.
(a) Newtonian
(b) Non-Newtonian
(c) Dilatant
(d) ideal
Answer B
9. The printer’s ink is an example of
(a) Newtonian fluid
(b) Non-Newtonian
(c) Thixotropic substance
(d) Elastic solid.
Answer C
10. The viscosity of liquids ..... with increase in temperature.
(a) Decreases
(b) Increases
(c) First decreases and then increases
(d) First increases and then decreases.
Answer A
11. Surface tension is caused by the force of ..... at the free surface.
(a) Cohesion
(b) Adhesion
(c) Both (a) and (b)
(d) None of the above.
Answer A
12. Which of the following is an example of phenomenon of surface tension?
(a) Rain drops
(b) Rise of sap in a tree
(c) Break up of liquid jets
(d) All of the above.
Answer D
13. Surface tension is expressed in
(a) N/m
(b) N/m2
(c) N2/m
(d) N/m3.
Answer A
14. Pressure
inside a water droplet is given by the relation
(a) p = 4𝜎/d
(b) p = 3𝜎/d
(c) p = 8𝜎/d
(d) p = 16𝜎/d
Answer A
15. . ...... is a phenomenon by which a liquid rises into a thin glass tube above or below
its general level.
(a) Surface tension
(b) Capillarity
(c) Cohesion
(d) Adhesion.
Answer B
16. The capillary rise of water in the glass tube is given by
(a) h = 2σ/wd
(b) h = 3σ/wd
(c) h = 4σ/wd
(d) h = 6σ/wd
Answer C
17. Elasticity of fluids is measured in terms of
(a) Young’s modulus of elasticity
(b) Shear modulus of elasticity
(c) Bulk modulus of elasticity
(d) None of the above.
Answer C
18. Compressibility is the reciprocal of
(a) Bulk modulus of elasticity
(b) Shear modulus of elasticity
(c) Young’s modulus of elasticity
(d) Any of the above.
Answer A
19. Bulk modulus of elasticity is the ratio of
(a) Tensile stress to tensile strain
(b) Compressive stress to compressive strain
(c) Compressive stress to volumetric strain
(d) None of the above.
Answer C
20. The value of bulk modulus of elasticity .......... with increase of
pressure.
(a) Increases
(b) Decreases
(c) Either of the above
(d) None of the above.
Answer A
21. The force per unit area is called
(a) Pressure
(b) Strain
(c) Surface tension
(d) None of the above.
Answer A
22. The pressure of a liquid on a surface will always act ...... to the
surface.
(a) Parallel
(b) Normal
(c) 45°
(d) 60°.
Answer B
23. The pressure ....... as the depth of the liquid increases.
(a) Increases
(b) Decreases
(c) Remain unchanged
(d) None of the above.
Answer A
24. The intensity of pressure in a liquid due to its depth will vary ....
with depth.
(a) Directly
(b) Indirectly
(c) Either of the above
(d) None of the above.
Answer A
25. The height of the free surface above any point is known as
(a) Static head
(b) Intensity of pressure
(c) Either of the above
(d) None of the above.
Answer A
26. “The intensity of pressure at any point in a liquid at rest is the same in all
directions.” The above statement is known as
(a) Kirchhoff’s law
(b) Pascal’s law
(c) Either of the above
(d) None of the above.
Answer B
27. Any pressure measured above the absolute zero of pressure is termed as
(a) Atmospheric pressure
(b) Gauge pressure
(c) Either of the above
(d) None of the above
Answer C
28. The fundamental S.I. unit of pressure is N/m2 this is also known as
......
(a) Pascal
(b) Stoke
(c) Poise
Answer A
0 comments: