# Hydraulics and Fluid Mechanics MCQ – Set 16

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## Q1. Euler’s equation in the differential form for the motion of liquids is given by

(A) dp/ρ + g.dz + v.dv = 0
(B) dp/ρ – g.dz + v.dv = 0
(C) ρ.dp + g.dz + v.dv = 0
(D) ρ.dp – g.dz + v.dv = 0

Answer: (A) dp/ρ + g.dz + v.dv = 0

## Q2. A nozzle placed at the end of a water pipe line discharges water at a

(A) Low pressure
(B) High pressure
(C) Low velocity
(D) High velocity

## Q3. The discharge over a rectangular notch is (where b = Width of notch, and H = Height of liquid, above the sill of the notch)

(A) (2/3) Cd × b × √(2gH)
(B) (2/3) Cd × b × √(2g) × H
(C) (2/3) Cd × b × √(2g) × H3/2
(D) (2/3) Cd × b × √(2g) × H2

Answer: (C) (2/3) Cd × b × √(2g) × H3/2

(A) v²/2g
(B) 0.5v²/2g
(C) 0.375v²/2g
(D) 0.75v²/2g

(A) 1/16 to 1/8
(B) 1/8 to 1/4
(C) 1/4 to 1/3
(D) 1/3 to 1/2

(A) Triangular
(B) Rectangular
(C) Square
(D) Trapezoidal

(A) Pressure
(B) Discharge
(C) Velocity
(D) Volume

## Q8. At the center line of a pipe flowing under pressure where the velocity gradient is zero, the shear stress will be

(A) Minimum
(B) Maximum
(C) Zero
(D) Could be any value

Answer: (D) Could be any value

## Q9. A weir is said to be broad crested weir, if the width of the crest of the weir is __ half the height of water above the weir crest.

(A) Equal to
(B) Less than
(C) More than
(D) None of these

## Q10. Which of the following instrument can be used for measuring speed of an aeroplane?

(A) Venturimeter
(B) Orifice plate
(C) Pitot tube
(D) Rotameter

## Q11. A hemispherical tank of radius (R) has an orifice of cross-sectional area (a) at its bottom and is full of liquid. The time required to empty the tank completely is

(A) 14π R1/2/15Cd × a √(2g)
(B) 14π R3/2/15Cd × a √(2g)
(C) 14π R5/2/15Cd × a √(2g)
(D) 14π R7/2/15Cd × a √(2g)

Answer: (C) 14π R5/2/15Cd × a √(2g)

(A) Pascal
(B) Poise
(C) Stoke

## Q13. A uniform body 3 m long, 2 m wide and 1 m deep floats in water. If the depth of immersion is 0.6 m, then the weight of the body is

(A) 3.53 kN
(B) 33.3 kN
(C) 35.3 kN
(D) None of these

## Q14. The flow in which the velocity vector is identical in magnitude and direction at every point, for any given instant, is known as

(A) One dimensional flow
(B) Uniform flow
(D) Turbulent flow

## Q15. Mercury does not wet glass. This is due to property of liquid known as

(B) Cohesion
(C) Surface tension
(D) Viscosity

## Q16. The siphon will work satisfactorily, if the minimum pressure in the pipe is __ vapour pressure of liquid.

(A) Equal to
(B) Less than
(C) More than
(D) None of these

## Q17. The sheet of water flowing over a notch or a weir is known as

(A) Sill or crest
(B) Nappe or vein
(C) Orifice
(D) None of these

(A) tanθ = a/g
(B) tanθ = 2 a/g
(C) tanθ = a/2g
(D) tanθ = a2/2g

## Q19. The pressure of fluid due to hammer blow is

(A) Directly proportional to density of fluid
(B) Inversely proportional to density of fluid
(C) Directly proportional to (density)1/2 of fluid
(D) Inversely proportional to (density)1/2 of fluid

Answer: (C) Directly proportional to (density)1/2 of fluid

## Q20. A metal with specific gravity of ‘a’ floating in a fluid of same specific gravity ‘a’ will

(A) Sink to bottom
(B) Float over fluid
(C) Partly immersed
(D) Be fully immersed with top surface at fluid surface

Answer: (D) Be fully immersed with top surface at fluid surface

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