Hydraulics and Fluid Mechanics Objective Questions with Answers - Set 06 - ObjectiveBooks
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# Practice Test: Question Set - 06

1. Stoke is the unit of
(A) Kinematic viscosity in C. G. S. units
(B) Kinematic viscosity in M. K. S. units
(C) Dynamic viscosity in M. K. S. units
(D) Dynamic viscosity in S. I. units

2. The vapour pressure over the concave surface is
(A) Less man the vapour pressure over the plane surface
(B) Equal to the vapour pressure over the plane surface
(C) Greater than the vapour pressure over the plane surface
(D) Zero

3. The velocity at which the flow changes from laminar flow to turbulent flow is called
(A) Critical velocity
(B) Velocity of approach
(C) Sub-sonic velocity
(D) Super-sonic velocity

4. Mercury is often used in barometer because
(A) It is the best liquid
(B) The height of barometer will be less
(C) Its vapour pressure is so low that it may be neglected
(D) Both (B) and (C)

5. A vertical wall is subjected to a pressure due to one kind of liquid, on one of its sides. Which of the following statement is correct?
(A) The pressure on the wall at the liquid level is minimum
(B) The pressure on the bottom of the wall is maximum
(C) The pressure on the wall at the liquid level is zero, and on the bottom of the wall is maximum
(D) The pressure on the bottom of the wall is zero

6. Center of pressure compared to e.g. is
(A) Above it
(B) Below it
(C) At same point
(D) Above or below depending on area of body

7. The center of gravity of the volume of the liquid displaced by an immersed body is called
(A) Center of gravity
(B) Center of pressure
(C) Metacenter
(D) Center of buoyancy

8. A tank of uniform cross-sectional area (A) containing liquid upto height (H1) has an orifice of cross-sectional area (a) at its bottom. The time required to bring the liquid level from H1 to H2 will be
(A) 2A × √H₁/Cd × a × √(2g)
(B) 2A × √H₂/Cd × a × √(2g)
(C) 2A × (√H₁ - √H₂)/Cd × a × √(2g)
(D) 2A × (√H3/2 - √H3/2)/Cd × a × √(2g)

10. The viscosity of water at 20°C is
(A) One stoke
(B) One centistoke
(C) One poise
(D) One centipoise

11. The velocity of jet of water traveling out of opening in a tank filled with water is proportional to
(B)
(C) V/T
(D) h/2

12. According to Darcy's formula, the loss of head due to friction in the pipe is (where f = Darcy's coefficient, l = Length of pipe, v = Velocity of liquid in pipe, and d = Diameter of pipe)
(A) flv²/2gd
(B) flv²/gd
(C) 3flv²/2gd
(D) 4flv²/2gd

13. According to Bernoulli's equation for steady ideal fluid flow
(A) Principle of conservation of mass holds
(B) Velocity and pressure are inversely proportional
(C) Total energy is constant throughout
(D) The energy is constant along a streamline but may vary across streamlines

14. The discharge through a convergent mouthpiece is __________ the discharge through an internal mouthpiece of the same diameter and head of water.
(A) Equal to
(B) One-half
(C) Three fourth
(D) Double

15. Bernoulli equation deals with the law of conservation of
(A) Mass
(B) Momentum
(C) Energy
(D) Work

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