Fluid Mechanics

Fluid Mechanics MCQs
Fluid Mechanics Objectives

Fluid Mechanics Previous Year MCQs

Topic :-  Fluid Properties, Hydrostatic Forces, Buoyancy and Floatation

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Fluid Mechanics MCQs
Fluid Mechanics Objectives

Fluid Mechanics Previous Year MCQs

Topic :-  Fluid Properties, Hydrostatic Forces, Buoyancy and Floatation

Q.1. The pressure intensity in kg/cm² at any point in a liquid is (where w is unit weight of liquid in kg/cm³, h is the depth of the point from liquid surface)  [SSC : JE : 2011]

a) w

b) w/h

c) h/w

d) wh  ✔

Q.2. The characteristic of an ideal fluid is ? [SSC : JE :  2012, DMRC : JE : 2017]

a) one which satisfies continuity equation

b) one which flows with least friction

c) one which obeys Newton's law of Viscosity

d) frictionless and incompressible ✔

Q.3. A rectangular plate 1.25 m x 2.4 m is immersed in a liquid of relative density 0.85 with its 1.25 m side horizontal and just at the water surface. If the plane of the plate makes an angle of 60° with the horizontal, the pressure force on one side of the plate of  [SSC : JE : 2012]

a) 30.6 kN  ✔

b) 26.0 kN

c) 15.0 kN

d) 30.0 kN

Q.4. The ratio of specific weight of a liquid to the specific weight of pure water at a standard temperature is called  [SSC : JE : 2012]

a) Compressibility of liquid

b) Surface tension of liquid

c) Density of liquid

d) Specific gravity of liquid ✔

Q.5. Bulk modulus of fluid is the ratio of  [SSC : JE : 2014]

a) shear stress to shear strain

b) increase in volume to the viscosity of fluid

c) increase in pressure to the volumetric strain ✔

d) critical velocity to the velocity of fluid

Q.6. The buoyancy depends upon the [SSC : JE : 2013]

a) pressure with which the liquid is displaced

b) weight of the liquid displaced ✔

c) viscosity of the liquid

d) compressibility of the liquid

Q.7. Manometer is a device used for measuring [SSC : JE : 2014, WRD : 2015]

a) Velocity

b) Density

c) Pressure ✔

d) Discharge

Q.8.Capillarity is due to (I) surface tension (II) cohesion (III) viscosity (IV) weight density of liquid  [SSC : JE : 2014]

a) II, III

b) III

c) I  ✔

d) II, III, V

Q.9. Pressure in terms of metres of oil (specific gravity 0.9) equivalent to 4.5 m of water is   [SSC : JE : 2014]

a) 4.05

b) 3.6

c) 5.0  ✔

d) 0.298

Pressure is terms of metres of oil = 4.5/0.9 = 5 m

Q.10. Capillary rise is a phenomenon that is attributed to the following property of fluid  [SSC : JE : 2014]

a) vapour pressure

b) viscosity

c) density

d) surface tension ✔

Q.11. Specific gravity has a unit  [SSC : JE : 2014, DMRC : JE : 2017]

a) g/cc

b) kg/m³

c) N/m³

d) No unit i.e.. dimensionless  ✔

Q.12. The total energy line lies above the hydraulic gradient line by an amount equal to  [SSC : JE : 2014]

a) sum of pressure, velocity and datum heads

b) Pressure head, P/γ

c) Velocity head,  v²/2g ✔

d) datum head, z

Q.13. A fluid, which is incompressible and is having no viscosity is [SSC : JE : 2014]

a) Ideal fluid  ✔

b) Real fluid

c) Newtonian fluid

d) Non Newtonian fluid

Q.14. For stability of floating bodies, the metacentre should be: [SSC : JE : 2015]

a) above the centre of gravity ✔

b) below the centre of gravity

c) above the centre of buoyancy

d) below the centre of buoyancy

Q.15. The volumetric change of the fluid cause by resistance is ______ [DMRC : JE : 2017]

a) volumetric strain

b) adhesion

c) compressibility ✔

d) volumetric index

Q.16. The property by which the molecules of fluid are attracted by their own is called as _______ ? [DMRC : JE : 2017]

a) Surface Tension

b) cohesion ✔

c) adhesion

d) viscosity

Q.17. Mercury is used in Manometer because [WRD : 2016]

a) Its volume changes with temperature

b) It is liquid metal

c) It gives less height of column for high pressure ✔

d) It is perfect Fluid

Q.18. A differential manometer is used to measure [WRD : 2016]

a) Atmospheric pressure

b) Pressure at a point in a pipe

c) Velocity of liquid

d) Pressure difference between two points in a pipe ✔

Q.19. The center of gravity of the volume of the liquid displaced by an immersed body is called_______ [PWD : 2018]

a) center of gravity

b) center of pressure

c) metacentre

d) center of buoyancy ✔

Q.20. The unit kg/m³ is used for [PWD : 2018]

a) force

b) density  ✔

c) volume

d) pressure

Q.21. The specific volume of a liquid is the reciprocal of

a) weight density

b) mass density ✔

c) specific weight

d) specific volume

Q.22. If a person studies about a fluid which is at rest, what will you call his domain of study?

a) Fluid Mechanics

b) Fluid Statics ✔

c) Fluid Kinematics

d) Fluid Dynamics

Q.23. The value of the compressibility of an ideal fluid is

a) zero ✔

b) unity

c) infinity

d) more than that of a real fluid

Q.24. Which of the following contribute to the reason behind the origin of surface tension?

a) only cohesive forces

b) only adhesive forces

c) neither cohesive forces nor adhesive forces

d) both cohesive forces and adhesive forces ✔

Q.25. A manometric liquid should suitably have ______

a) Low density & Low Vapour pressure

b) Low density & High Vapour pressure

c) High density & Low Vapour pressure ✔

d) High density & High Vapour pressure