# Hydraulics and Fluid Mechanics MCQ – Set 21

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(A) 1.84 LH1/2
(B) 1.84 LH
(C) 1.84 LH3/2
(D) 1.84 LH5/2

## Q2. The pressure at a point in a fluid will not be same in all the directions when the fluid is

(A) Moving
(B) Viscous
(C) Viscous and static
(D) Viscous and moving

## Q3. The meatcentric height is the distance between the

(A) Centre of gravity of the floating body and the centre of buoyancy
(B) Centre of gravity of the floating body and the metacentre
(C) Metacentre and centre of buoyancy
(D) Original centre of buoyancy and new centre of buoyancy

Answer: (B) Centre of gravity of the floating body and the metacentre

## Q4. A structure, whose width is __ the width of the channel, is called a flumed structure.

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

## Q5. Falling drops of water become spheres due to the property of

(A) Surface tension of water
(B) Compressibility of water
(C) Capillarity of water
(D) Viscosity of water

Answer: (A) Surface tension of water

## Q6. The flow of water through the hole in the bottom of a wash basin is an example of

(B) Uniform flow
(C) Free vortex
(D) Forced vortex

## Q7. The pressure in the air space above an oil (sp. gr. 0.8) surface in a tank is 0.1 kg/cm”. The pressure at 2.5 m below the oil surface will be

(A) 2 metres of water column
(B) 3 metres of water column
(C) 3.5 metres of water column
(D) 4 m of water column

Answer: (B) 3 metres of water column

## Q8. 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

## Q9. When a body, floating in a liquid, is given a small angular displacement, it starts oscillating about a point known as

(A) Centre of pressure
(B) Centre of gravity
(C) Centre of buoyancy
(D) Metacentre

(A) 0.34 times
(B) 0.67 times
(C) 0.81 times
(D) 0.95 times

(A) p/sinα
(B) 2p/sinα
(C) p/2sinα
(D) 2p/sin (α/2)

## Q12. The discharge through a large rectangular orifice is given by (where H1 = Height of the liquid above the top of the orifice, H2 = Height of the liquid above the bottom of the orifice, b = Breadth of the orifice, and Cd = Coefficient of discharge)

(A) Q = (2/3) Cd × b × √(2g) × (H2 – H1)
(B) Q = (2/3) Cd × b × √(2g) × (H21/2 – H11/2)
(C) Q = (2/3) Cd × b × √(2g) × (H23/2 – H13/2)
(D) Q = (2/3) Cd × b × √(2g) × (H22 – H12)

Answer: (C) Q = (2/3) Cd × b × √(2g) × (H23/2 – H13/2)

(A) 500 kg
(B) 1000 kg
(C) 1500 kg
(D) 2000 kg

## Q14. For measuring flow by a Venturimeter, if should be installed in

(A) Vertical line
(B) Horizontal line
(C) Inclined line with flow downward
(D) In any direction and in any location

Answer: (D) In any direction and in any location

## Q15. In a free vortex motion, the radial component of velocity everywhere is

(A) Maximum
(B) Minimum
(C) Zero
(D) Nonzero and finite

## Q16. The Reynold’s number of a ship is __ to its velocity and length.

(A) Directly proportional
(B) Inversely proportional
(C) Square root of velocity
(D) None of these

## Q17. The angle of contact in case of a liquid depends upon

(A) The nature of the liquid and the solid
(B) The material which exists above the free surface of the liquid
(C) Both of die above
(D) Any one of the above

Answer: (C) Both of die above

(A) 0.1 N-s/m2
(B) 1 N-s/m2
(C) 10 N-s/m2
(D) 100 N-s/m2

## Q19. The pressure of air __ with the increase of height from the surface of the earth.

(A) Does not change
(B) Decreases
(C) Increases
(D) None of these