# Hydraulics and Fluid Mechanics MCQ – Set 24

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(A) 1 Pa
(B) 91 Pa
(C) 981 Pa
(D) 9810 Pa

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

## Q3. The ratio of the inertia force to the viscous force is called

(A) Reynold’s number
(B) Froude’s number
(C) Weber’s number
(D) Euler’s number

## Q4. The buoyancy depends upon the

(A) Weight of the liquid displaced
(B) Pressure with which the liquid is displaced
(C) Viscosity of the liquid
(D) Compressibility of the liquid

Answer: (A) Weight of the liquid displaced

(A) 19.24 kPa
(B) 29.24 kPa
(C) 39.24 kPa
(D) 49.24 kPa

## Q6. The flow in a pipe is turbulent when Reynold number is

(A) Less than 2000
(B) Between 2000 and 2800
(C) More than 2800
(D) None of these

## Q7. The dynamic viscosity of gases __ with rise in temperature.

(A) Remain unaffected
(B) Increases
(C) Decreases
(D) None of these

## Q8. Water is _ liquid.

(A) A compressible
(B) An incompressible
(C) Both A and B
(D) None of these

## Q9. A channel is said to be of most economical cross-section, if

(A) It gives maximum discharge for a given cross-sectional area and bed slope
(B) It has minimum wetted perimeter
(C) It involves lesser excavation for the designed amount of discharge
(D) All of the above

Answer: (D) All of the above

## Q11. A manometer is used to measure

(A) Low pressure
(B) Moderate pressure
(C) High pressure
(D) Atmospheric pressure

## Q12. The coefficient of viscosity may be determined by

(A) Capillary tube method
(B) Orifice type viscometer
(C) Rotating cylinder method
(D) All of these

(A) Linear
(B) Parabolic
(C) Hyperbolic
(D) Inverse type

## Q14. The value of coefficient of discharge is __ the value of coefficient of velocity.

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

(C) Laminar flow
(D) Uniform flow

## Q16. The pressure of a liquid measured with the help of a Piezometer tube is

(A) Vacuum pressure
(B) Gauge pressure
(C) Absolute pressure
(D) Atmospheric pressure

(A) 1
(B) 1000
(C) 100.9
(D) 101.9

(A) 0.62
(B) 0.76
(C) 0.84
(D) 0.97

(A) wH
(B) wH/2
(C) wH2/2
(D) wH2/3