Hydraulics Objective Questions with Answers - Set 25 - ObjectiveBooks

# Practice Test: Question Set - 25

1. Whenever a plate is held immersed at some angle with the direction of flow of the liquid, it is subjected to some pressure. The component of this pressure, in the direction of flow of the liquid, is known as
(A) Lift
(B) Drag
(C) Stagnation pressure
(D) Bulk modulus

2. Which of the following is dimensionless?
(A) Specific weight
(B) Specific volume
(C) Specific speed
(D) Specific gravity

3. 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

4. Mercury does not wet glass. This is due to property of liquid known as
(B) Cohesion
(C) Surface tension
(D) Viscosity

5. A flow in which __________ force is dominating over the viscosity is called turbulent flow.
(A) Elastic
(B) Surface tension
(C) Viscous
(D) Inertia

6. Specific weight of sea water is more that of pure water because it contains
(A) Dissolved air
(B) Dissolved salt
(C) Suspended matter
(D) All of the above

7. In an internal mouthpiece, the absolute pressure head at vena contracta is __________ the atmospheric pressure head by an amount equal to height of the liquid above the vena contracta.
(A) Less than
(B) More than
(C) Equal to
(D) None of these

8. An odd shaped body weighing 7.5 kg and occupying 0.01 m3 volume will be completely submerged in a fluid having specific gravity of
(A) 1
(B) 1.2
(C) 0.8
(D) 0.75

9. The factional resistance of a pipe varies approximately with __________ of the liquid.
(A) Pressure
(B) Velocity
(C) Square of velocity
(D) Cube of velocity

10. 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

11. 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

12. All the terms of energy in Bernoulli's equation have dimension of
(A) Energy
(B) Work
(C) Mass
(D) Length

13. The pressure at a point 4 m below the free surface of water is
(A) 19.24 kPa
(B) 29.24 kPa
(C) 39.24 kPa
(D) 49.24 kPa

14. Specific weight of water in S.I. units is equal to
(A) 1000 N/m3
(B) 10000 N/m3
(C) 9.81 × 103 N/m3
(D) 9.81 × 10⁶ N/m3

15. The length AB of a pipe ABC in which the liquid is flowing has diameter (d1) and is suddenly enlarged to diameter (d2) at B which is constant for the length BC. The loss of head due to sudden enlargement is
(A) (v₁ - v₂)²/g
(B) (v₁² - v₂²)/g
(C) (v₁ - v₂)²/2g
(D) (v₁² - v₂²)/2g

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