# Hydraulics and Fluid Mechanics MCQ – Set 15

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## Q1. Which of the following is dimensionless?

(A) Specific weight
(B) Specific volume
(C) Specific speed
(D) Specific gravity

## Q2. Poise is the unit of

(A) Surface tension
(B) Capillarity
(C) Viscosity
(D) Shear stress in fluids

## Q3. The discharge over the trapezoidal notch is equal to the discharge over the rectangular notch __ the discharge over the triangular notch.

(A) Plus
(B) Minus
(C) Divide
(D) None of these

(A) wH/2
(B) wH
(C) wH2/2
(D) wH2/4

## Q5. The flow in which conditions do not change with time at any point, is known as

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

## Q6. If 850 kg liquid occupies volume of one cubic meter, men 0.85 represents its

(A) Specific weight
(B) Specific mass
(C) Specific gravity
(D) Specific density

(A) 4.5 kN/m3
(B) 6 kN/m3
(C) 7.5 kN/m3
(D) 10 kN/m3

## Q8. A fluid having no viscosity is known as

(A) Real fluid
(B) Ideal fluid
(C) Newtonian fluid
(D) Non-Newtonian fluid

(A) 0.417 H5/2
(B) 1.417 H5/2
(C) 4.171 H5/2
(D) 7.141 H5/2

## Q10. The units of dynamic or absolute viscosity are

(A) Metres² per sec
(B) kg sec/meter
(C) Newton-sec per meter
(D) Newton-sec² per meter

(A) (q/g)1/2
(B) (q²/g)1/3
(C) (q³/g)1/4
(D) (q⁴/g)1/5

(A) 0° C
(B) 0° K
(C) 4° C
(D) 100° C

## Q13. The liquid used in manometers should have

(A) Low density
(B) High density
(C) Low surface tension
(D) High surface tension

## Q14. Falling drops of water become spheres due to the property of

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

## Q15. According to Bazin’s formula, the discharge over a rectangular weir is mL2g x H3/2where m is equal to

(A) 0.405 + (0.003/H)
(B) 0.003 + (0.405/H)
(C) 0.405 + (H/0.003)
(D) 0.003 + (H/0.405)

## Q16. When an internal mouthpiece is running free, the discharge through the mouthpiece is (where a = Area of mouthpiece, and H = Height of liquid above the mouthpiece)

(A) 0.5 a. √2gH
(B) 0.707 a. √2gH
(C) 0.855 a. √2gH
(D) a. √2gH

## Q17. The pressure of liquid at throat in a Venturimeter is __ than that at inlet.

(A) Higher
(B) Lower
(C) Same
(D) None of these

## Q18. Coefficient of resistance is the ratio of

(A) Actual velocity of jet at vena-contracta to the theoretical velocity
(B) Area of jet at vena-contracta to the area of orifice
(C) Loss of head in the orifice to the head of water available at the exit of the orifice
(D) Actual discharge through an orifice to the theoretical discharge

Answer: (C) Loss of head in the orifice to the head of water available at the exit of the orifice

(A) Sum
(B) Different
(C) Product
(D) Ratio