# Hydraulics and Fluid Mechanics MCQ – Set 22

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## Q1. The force of buoyancy is always __ the weight of the liquid displaced by the body.

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

(A) 0.8
(B) 1
(C) 1.2
(D) 1.6

## Q3. A flow in which the viscosity of fluid is dominating over the inertia force is called

(C) Laminar flow
(D) Turbulent flow

## Q5. To avoid an interruption in the flow of a siphon, an air vessel is provided

(A) At the inlet
(B) At the outlet
(C) At the summit
(D) At any point between inlet and outlet

## Q6. A nozzle is generally made of

(A) Cylindrical shape
(B) Convergent shape
(C) Divergent shape
(D) Convergent-divergent shape

## Q7. Uniform flow occurs when

(B) The flow is streamline
(C) Size and shape of the cross section in a particular length remain constant
(D) Size and cross section change uniformly along length

Answer: (C) Size and shape of the cross section in a particular length remain constant

## Q8. In a venturi-flume, the flow takes place at

(A) Atmospheric pressure
(B) Gauge pressure
(C) Absolute pressure
(D) None of these

(A) 1 %
(B) 1.5 %
(C) 2 %
(D) 2.5 %

## Q10. The velocity at which the laminar flow stops, is known as

(A) Velocity of approach
(B) Lower critical velocity
(C) Higher critical velocity
(D) None of these

## Q11. The ratio of the inertia force to the elastic force is called

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

## Q12. Coefficient of contraction is the ratio of

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

Answer: (D) Area of jet at vena-contracta to the area of orifice

## Q13. With an increase in size of tube, the rise or depression of liquid in the tube due to surface tension will

(A) Decrease
(B) Increase
(C) Remain unchanged
(D) Depend upon the characteristics of liquid

## Q14. A flow in which each liquid particle has a definite path, and the paths of individual particles do not cross each other, is called

(B) Uniform flow
(C) Streamline flow
(D) Turbulent flow

## Q15. When a vertical wall is subjected to pressures due to liquid on both sides, the resultant pressure is the __ of the two pressures.

(A) Sum
(B) Difference
(C) Arithmetic mean
(D) Geometric mean

## Q16. Froude’s number is the ratio of inertia force to

(A) Pressure force
(B) Elastic force
(C) Gravity force
(D) Surface tension force

## Q17. The property of a liquid which offers resistance to the movement of one layer of liquid over another adjacent layer of liquid, is called

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

(A) 0° C
(B) 0° K
(C) 4° C
(D) 20° C

## Q19. The length of the divergent cone in a Venturimeter is __ that of the convergent cone.

(A) Equal to
(B) Double
(C) Three to four times
(D) Five to six times

Answer: (C) Three to four times

## Q20. The hydraulic mean depth or the hydraulic radius is the ratio of

(A) Area of flow and wetted perimeter
(B) Wetted perimeter and diameter of pipe
(C) Velocity of flow and area of flow
(D) None of these

Answer: (A) Area of flow and wetted perimeter

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