Hydraulics And Fluid Mechanics MCQs

Option A: Viscosity of a fluid is that property which determines the amount of its resistance to a shearing force

Option B: Viscosity is due primarily to interaction between fluid molecules

Option C: Viscosity of liquids decreases with in-crease in temperature

Option D: Viscosity of liquids is appreciably affected by change in pressure

Correct Answer: Viscosity of liquids is appreciably affected by change in pressure ✔

Option A: fluids are capable of flowing

Option B: fluids conform to the shape of the con-taining vessels

Option C: when in equilibrium, fluids cannot sustain tangential forces

Option D: when in equilibrium, fluids can sustain shear forces

Correct Answer: when in equilibrium, fluids can sustain shear forces ✔

Option A: any weight, floating or immersed in a liquid, is acted upon by a buoyant force

Option B: Buoyant force is equal to the weight of the liquid displaced

Option C: The point through which buoyant force acts, is called the center of buoyancy

Option D: Center of buoyancy is located above the center of gravity of the displaced liquid v

Correct Answer: Center of buoyancy is located above the center of gravity of the displaced liquid v ✔

Option A: The center of buoyancy is located at the center of gravity of the displaced liquid

Option B: For stability of a submerged body, the center of gravity of body must lie directly below the center of buoyancy

Option C: If e.g. and center of buoyancy coincide, the submerged body must lie at neutral equilibrium for all positions

Option D: For stability of floating cylinders or spheres, the e.g. of body must lie below the center of buoyancy

Correct Answer: All floating bodies are stable ✔

Option A: Local atmospheric pressure depends upon elevation of locality only

Option B: Standard atmospheric pressure is the mean local atmospheric pressure a* sea level

Option C: Local atmospheric pressure is always below standard atmospheric pressure

Option D: A barometer reads the difference be-tween local and standard atmospheric pressure

Correct Answer: Standard atmospheric pressure is the mean local atmospheric pressure a* sea level ✔

Option A: maximum

Option B: minimum

Option C: zero

Option D: non-zero finite

Correct Answer: zero ✔

Option A: friction loss and flow

Option B: length and diameter

Option C: flow and length

Option D: friction factor and diameter

Correct Answer: friction loss and flow ✔

Option A: minimum

Option B: maximum

Option C: zero

Option D: negative value

Correct Answer: could be any value ✔

Option A: less than 2000

Option B: between 2000 and 4000

Option C: more than 4000

Option D: less than 4000

Correct Answer: less than 2000 ✔

Option A: gravity, pressure and viscous

Option B: gravity, pressure and turbulent

Option C: pressure, viscous and turbulent

Option D: gravity, viscous and turbulent

Correct Answer: gravity, pressure and viscous ✔

Option A: energy

Option B: work

Option C: mass

Option D: length

Correct Answer: length ✔

Option A: the direction and magnitude of the velocity at all points are identical

Option B: the velocity of successive fluid par-ticles, at any point, is the same at suc-cessive periods of time

Option C: the magnitude and direction of the velocity do not change from point to point in the fluid

Option D: the fluid particles move in plane or parallel planes and the streamline pat-terns are identical in each plane

Correct Answer: the fluid particles move in plane or parallel planes and the streamline pat-terns are identical in each plane ✔

Option A: unity

Option B: greater than unity

Option C: greater than 2

Option D: greater than 4

Correct Answer: greater than 4 ✔

Option A: steady flow

Option B: unsteady flow

Option C: laminar flow

Option D: uniform flow

Correct Answer: uniform flow ✔

Option A: pressure

Option B: flow

Option C: velocity

Option D: dsscharge

Correct Answer: velocity ✔

Option A: keeps on increasing

Option B: keeps on decreasing

Option C: remains constant

Option D: may increase/decrease

Correct Answer: remains constant ✔

Option A: supersonics, as with projectiles and jet propulsion

Option B: full immersion or completely enclosed flow, as with pipes, aircraft wings, nozzles etc.

Option C: simultaneous motion through two fluids where there is a surface of dis-continuity, gravity force, and wave making effects, as with ship’s hulls

Option D: all of fhe above

Correct Answer: supersonics, as with projectiles and jet propulsion ✔

Option A: principle of conservation of mass holds

Option B: velocity and pressure are inversely proportional

Option C: total energy is constant throughout

Option D: the energy is constant along a stream-line but may vary across streamlines

Correct Answer: the energy is constant along a stream-line but may vary across streamlines ✔

Option A: is steady

Option B: is one dimensional

Option C: velocity is uniform at all the cross sec-tions

Option D: all of the above

Correct Answer: all of the above ✔

Option A: supersonics, as with projectile and jet propulsion

Option B: full immersion or completely enclosed flow, as with pipes, aircraft wings, nozzles etc.

Option C: simultaneous motion through two fluids where there is a surface of dis-continuity, gravity forces, and wave making effect, as with ship’s hulls

Option D: all of the above

Correct Answer: simultaneous motion through two fluids where there is a surface of dis-continuity, gravity forces, and wave making effect, as with ship’s hulls ✔

Option A: supersonics, as with projectile and jet propulsion

Option B: full immersion or completely enclosed flow, as with pipes, aircraft wings, nozzles etc

Option C: simultaneous motion through two fluids where there is a surface of dis-continuity, gravity forces, and wave making effect, as with ship’s hulls

Option D: all of the above

Correct Answer: full immersion or completely enclosed flow, as with pipes, aircraft wings, nozzles etc ✔

Option A: smooth and streamline flow

Option B: laminar flow

Option C: steady flow

Option D: turbulent flow

Correct Answer: turbulent flow ✔

Option A: frictional force

Option B: viscosity

Option C: surface friction

Option D: all of the above

Correct Answer: all of the above ✔

Option A: 1 Pa

Option B: 91Pa

Option C: 981 Pa

Option D: 9810 Pa

Correct Answer: 9810 Pa ✔

Option A: less than 2000

Option B: between 2000 and 4000

Option C: more than 4000

Option D: less than 4000

Correct Answer: more than 4000 ✔

Option A: 10 kg

Option B: 100 kg

Option C: 1000 kg

Option D: 1 kg

Correct Answer: 10 kg ✔

Option A: mass

Option B: momentum

Option C: energy

Option D: work

Correct Answer: energy ✔

Option A: high velocity

Option B: high pressure

Option C: weak material

Option D: low pressure

Correct Answer: low pressure ✔

Option A: comparing two identical equipments

Option B: designing models so that the result can be converted to prototypes

Option C: comparing similarity between design and actual equipment

Option D: hydraulic designs

Correct Answer: designing models so that the result can be converted to prototypes ✔

Option A: the pressure at any location reaches an absolute pressure equal to the saturated vapour pressure of the liquid

Option B: pressure becomes more than critical pressure

Option C: flow is increased

Option D: pressure is increased

Correct Answer: the pressure at any location reaches an absolute pressure equal to the saturated vapour pressure of the liquid ✔

Option A: ratio of inertial force to force due to viscosity

Option B: ratio of inertial force to force due to gravitation

Option C: ratio of inertial force to force due to surface tension

Option D: all the four ratios of inertial force to force due to viscosity, gravitation, surface tension, and elasticity

Correct Answer: all the four ratios of inertial force to force due to viscosity, gravitation, surface tension, and elasticity ✔

Option A: specific gravity of liquids

Option B: specific gravity of solids

Option C: specific gravity of gases

Option D: relative humidity

Correct Answer: specific gravity of liquids ✔

Option A: the direction and magnitude of the velocity at all points are identical

Option B: the velocity of successive fluid pai-ticles, at any point, is the same at suc¬cessive periods of time

Option C: the magnitude and direction of the velocity do not change from point to point in the fluid

Option D: the fluid particles move in plane or parallel planes and the streamline pat-terns are identical in each plsr.e

Correct Answer: the magnitude and direction of the velocity do not change from point to point in the fluid ✔

Option A: crest

Option B: nappe

Option C: sill

Option D: weir top

Correct Answer: sill ✔

Option A: wake

Option B: drag

Option C: lift

Option D: boundary layer

Correct Answer: wake ✔

Option A: 0.83

Option B: 0.6

Option C: 0.4

Option D: 0.3

Correct Answer: 0.6 ✔

Option A: maximum

Option B: minimum

Option C: zero

Option D: non-zero and finite

Correct Answer: zero ✔

Option A: head of water (h)

Option B: h2

Option C: V/T

Option D: h2

Correct Answer: V/T ✔

Option A: 0.5

Option B: 0.4

Option C: 0.515

Option D: 0.5

Correct Answer: 0.5 ✔

Option A: parallel to central axis flow

Option B: parallel to outer surface of pipe

Option C: of equal yelocity in a flow

Option D: along which the pressure drop is uniform

Correct Answer: of equal yelocity in a flow ✔

Option A: steady flow

Option B: turbulent flow

Option C: laminar flow

Option D: non-uniform flow

Correct Answer: non-uniform flow ✔

Option A: one dimensional flow

Option B: uniform flow

Option C: steady flow

Option D: turbulent flow

Correct Answer: turbulent flow ✔

Option A: one dimensional flow

Option B: uniform flow

Option C: steady flow

Option D: turbulent flow

Correct Answer: one dimensional flow ✔

Option A: one dimensional flow

Option B: uniform flow

Option C: steady flow

Option D: turbulent flow

Correct Answer: steady flow ✔

Option A: steady

Option B: unsteady

Option C: laminar

Option D: vortex

Correct Answer: steady ✔

Option A: one dimensional flow

Option B: uniform flow

Option C: steady flow

Option D: turbulent flow

Correct Answer: uniform flow ✔

Option A: one dimensional flow

Option B: uniform flow

Option C: steady flow

Option D: turbulent flow

Correct Answer: streamline flow ✔

Option A: the direction and magnitude of the velocity at all points are identical

Option B: the velocity of successive fluid par-ticles, at any point, is the same at suc-cessive periods of time

Option C: the magnitude and direction of the velocity do not change from point to point in the fluid

Option D: the fluid particles move in plane or parallel planes and the streamline pat-terns are identical in each plane

Correct Answer: the velocity of successive fluid par-ticles, at any point, is the same at suc-cessive periods of time ✔

Option A: the flow is steady

Option B: the flow is streamline

Option C: size and shape of the cross section in a particular length remain constant

Option D: size and cross section change uniform¬ly along length

Correct Answer: size and shape of the cross section in a particular length remain constant ✔

Option A: vertical line

Option B: horizontal line

Option C: inclined line with flow downward

Option D: inclined line with upward flow

Correct Answer: in any direction and in any location ✔

Option A: Pascal law

Option B: Newton’s law of viscosity

Option C: boundary layer theory

Option D: continuity equation

Correct Answer: continuity equation ✔

Option A: the direction and magnitude of the velocity at all points are identical

Option B: the velocity of successive fluid par-ticles, at any point, is the same at suc-cessive periods of time

Option C: the magnitude aricf direction of the velocity do not change from point to point in the fluid

Option D: the fluid particles move in plane or parallel planes and the streamline pat-terns are identical in each plane

Correct Answer: velocity, depth, pressure, etc. change from point to point in the fluid flow ✔

Option A: steady uniform

Option B: non-steady non-uniform

Option C: non-steady uniform

Option D: steady non-uniform

Correct Answer: steady non-uniform ✔

Option A: steady

Option B: unsteady

Option C: uniform

Option D: laminar

Correct Answer: steady ✔

Option A: constant

Option B: variable

Option C: zero

Option D: zero under limiting conditions

Correct Answer: zero ✔

Option A: the direction and magnitude of the veiocity at all points are identical

Option B: the velocity of successive fluid par-ticles, at any point, is the same at suc-cessive periods of time

Option C: the magnitude and direction of the velocity do not change from point to point in the fluid

Option D: the fluid particles move in plane or parallel planes and the streamline pat-terns are identical in each plane

Correct Answer: the direction and magnitude of the veiocity at all points are identical ✔

Option A: orifice plate

Option B: venturi

Option C: rotameter

Option D: pitot tube

Correct Answer: pitot tube ✔

Option A: absolute pressure

Option B: velocity of fluid

Option C: flow

Option D: rotation

Correct Answer: flow ✔

Option A: 1000 kg

Option B: 4000 kg

Option C: 2000 kg

Option D: 8000 kg

Correct Answer: 1000 kg ✔

Option A: only when the fluid is frictionless

Option B: only when the fluid is incompressible and has zero viscosity

Option C: when there is no motion of one fluid layer relative to an adjacent layer

Option D: irrespective of the motion of one fluid layer relative to an adjacent layer

Correct Answer: when there is no motion of one fluid layer relative to an adjacent layer ✔

Option A: same

Option B: higher

Option C: lower

Option D: lower/higher depending on weight of body

Correct Answer: lower ✔

Option A: at the center of gravity

Option B: above the center of gravity

Option C: below be center of gravity

Option D: could be above or below e.g. depending on density of body and liquid

Correct Answer: below be center of gravity ✔

Option A: 2 meters of water column

Option B: 3 meters of water column

Option C: 3.5 meters of water column

Option D: 4 m of water column

Correct Answer: 3 meters of water column ✔

Option A: submerged body

Option B: volume of the floating body

Option C: volume of the fluid vertically above the body

Option D: displaced volume of the fluid

Correct Answer: displaced volume of the fluid ✔

Option A: pressure in pipes, channels etc.

Option B: atmospheric pressure

Option C: very low pressure

Option D: difference of pressure between two points

Correct Answer: difference of pressure between two points ✔

Option A: center of gravity

Option B: center of pressure

Option C: metacentre

Option D: center of buoyancy

Correct Answer: center of pressure ✔

Option A: buoyancy, gravity

Option B: buoyancy, pressure

Option C: buoyancy, inertial

Option D: inertial, gravity

Correct Answer: buoyancy, gravity ✔

Option A: at the centroid

Option B: above the centroid

Option C: below the centroid

Option D: at metacentre

Correct Answer: below the centroid ✔

Option A: be horizontal

Option B: make an angle in direction of inclination of inclined plane

Option C: make an angle in opposite direction to inclination of inclined plane

Option D: any one of above is possible

Correct Answer: make an angle in opposite direction to inclination of inclined plane ✔

Option A: meta center should be above e.g.

Option B: center of buoyancy and e.g. must lie on same vertical plane

Option C: a righting couple should be formed

Option D: all of the above

Correct Answer: all of the above ✔

Option A: Mach number

Option B: Froude number

Option C: Reynold’s number

Option D: Weber’s number

Correct Answer: Mach number ✔

Option A: 10 m/sec

Option B: 25 m/sec

Option C: 2 m/sec

Option D: 50 m/sec

Correct Answer: 2 m/sec ✔

Option A: 1 : 5

Option B: 1 : 2.5

Option C: 1 :25

Option D: 1:V5″

Correct Answer: 1 : 5 ✔

Option A: below the center of gravity

Option B: below the center of buoyancy

Option C: above the center of buoyancy

Option D: between e.g. and center of pressure

Correct Answer: above the center of gravity ✔

Option A: 900 minutes

Option B: 4 minutes

Option C: 4 x (225)3/2 minutes

Option D: 4 (225)1/3 minutes

Correct Answer: 4 x V225 minutes ✔

Option A: e.g. of body

Option B: center of pressure

Option C: center of buoyancy

Option D: metacentre

Correct Answer: metacentre ✔

Option A: Mach number

Option B: Froude number

Option C: Reynold’s number

Option D: Weber’s number

Correct Answer: Weber’s number ✔

Option A: resultant force acting on a floating body

Option B: equal to the volume of liquid displaced

Option C: force necessary to keep a body in equilibrium

Option D: the resultant force on a body due to the fluid surrounding it

Correct Answer: the resultant force on a body due to the fluid surrounding it ✔

Option A: the weight of the body

Option B: more than the weight of the body

Option C: less than the weight of the body

Option D: weight of the fluid displaced by the body

Correct Answer: weight of the fluid displaced by the body ✔

Option A: bottom surface of the body

Option B: e.g. of the body

Option C: metacentre

Option D: all points on the surface of the body

Correct Answer: all points on the surface of the body ✔

Option A: vertical upward force through e.g. of body and center line of body

Option B: buoyant force and the center line of body

Option C: mid point between e.g. and center of buoyancy

Option D: all of the above

Correct Answer: buoyant force and the center line of body ✔

Option A: 2.4 m

Option B: 3.0 m

Option C: 4.0 m

Option D: 5.0 m

Correct Answer: 3.0 m ✔

Option A: The horizontal component of the hydro-static force on any surface is equal to the normal force on the vertical projection of the surface

Option B: The horizontal component acts through the center of pressure for the vertical projection

Option C: The vertical component of the hydrostatic force on any surface is equal to the weight of the volume of the liquid above the area

Option D: he vertical component passes through the center of pressure of the volume

Correct Answer: he vertical component passes through the center of pressure of the volume ✔

Option A: 2 meters of water column

Option B: 3 meters of water column

Option C: 5 meters of water column

Option D: 6 meters of water Column

Correct Answer: 6 meters of water Column ✔

Option A: 9,000 kg

Option B: 13,500 kg

Option C: 18,000 kg

Option D: 27,000 kg

Correct Answer: 13,500 kg ✔

Option A: the area is horizontal

Option B: the area is vertical

Option C: the area is inclined

Option D: all of the above

Correct Answer: all of the above ✔

Option A: when its meatcentric height is zero

Option B: when the metancentre is above e.g

Option C: when its e.g. is below it’s center of buoyancy

Option D: metacentre has nothing to do with position of e.g. for determining stability

Correct Answer: when the metancentre is above e.g ✔

Option A: negligible

Option B: same as buoyant force

Option C: zero

Option D: non of these

Correct Answer: zero ✔

Option A: centroid of the displaced volume of fluid

Option B: center of pressure of displaced volume

Option C: e.g. of floating ‘body

Option D: does not exist

Correct Answer: centroid of the displaced volume of fluid ✔

Option A: 1

Option B: 5

Option C: 7

Option D: 6

Correct Answer: 6 ✔

Option A: upthrust

Option B: reaction

Option C: buoyancy

Option D: metacentre

Correct Answer: buoyancy ✔

Option A: above it

Option B: below it

Option C: at same point

Option D: above or below depending on area of body

Correct Answer: below it ✔

Option A: on the surface at which resultant pres-sure acts

Option B: on the surface at which gravitational force acis

Option C: at which all hydraulic forces meet

Option D: similar to metacentre

Correct Answer: on the surface at which resultant pres-sure acts ✔

Option A: water surface

Option B: center of pressure

Option C: center of gravity

Option D: center of buoyancy

Correct Answer: center of gravity ✔

Option A: at e.g. of body

Option B: at center of pressure

Option C: vertically upwards

Option D: at metacentre

Correct Answer: vertically upwards ✔

Option A: sin 9

Option B: sin 9

Option C: casS

Option D: cos 9

Correct Answer: sin 9 ✔

Option A: Pascal’s law

Option B: Dalton’s law of partial pressure

Option C: Newton’s law of viscosity .

Option D: Avogadro’s hypothesis

Correct Answer: Pascal’s law ✔

Option A: U-tube with water

Option B: inclined U-tube

Option C: U-tube with mercury

Option D: micro-manometer with water

Correct Answer: micro-manometer with water ✔

Option A: inertial force and gravity

Option B: viscous force and inertial force

Option C: viscous force and buoyancy force

Option D: pressure force and inertial force

Correct Answer: pressure force and inertial force ✔

Option A: increases

Option B: decreases

Option C: remains unaffected

Option D: unpredictable

Correct Answer: increases ✔