MCQ practice Test Hydraulics and Fluid Mechanics - Set 10 - ObjectiveBooks
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# Practice Test: Question Set - 10

1. True one-dimensional flow occurs when
(A) The direction and magnitude of the velocity at all points are identical
(B) The velocity of successive fluid particles, at any point, is the same at successive periods of time
(C) The magnitude and direction of the velocity do not change from point to point in the fluid
(D) The fluid particles move in plane or parallel planes and the streamline patterns are identical in each plane

2. The discharge in an open channel corresponding to critical depth is
(A) Zero
(B) Minimum
(C) Maximum
(D) None of these

3. A piece of wood having weight 5 kg floats in water with 60% of its volume under the liquid. The specific gravity of wood is
(A) 0.83
(B) 0.6
(C) 0.4
(D) 0.3

4. A pitot tube is used to measure the
(A) Velocity of flow at the required point in a pipe
(B) Pressure difference between two points in a pipe
(C) Total pressure of liquid flowing in a pipe
(D) Discharge through a pipe

5. The total energy of each particle at various places in the case of perfect incompressible fluid flowing in continuous stream
(A) Keeps on increasing
(B) Keeps on decreasing
(C) Remain constant
(D) May increase/decrease

6. The critical depth meter is used to measure
(A) Velocity of flow in an open channel
(B) Depth of flow in an open channel
(C) Hydraulic jump
(D) Depth of channel

7. Two pipe systems can be said to be equivalent, when the following quantities are same
(A) Friction loss and flow
(B) Length and diameter
(C) Flow and length
(D) Friction factor and diameter

8. In a footstep bearing, if the radius of the shaft is doubled, then the torque required to overcome the viscous resistance will be
(A) Double
(B) Four times
(C) Eight times
(D) Sixteen times

9. Surface tension has the units of
(A) Newton-sec/m
(B) Newton-m/sec
(C) Newton/m
(D) Newton

10. The value of bulk modulus of a fluid is required to determine
(A) Reynold's number
(B) Froude's number
(C) Mach number
(D) Euler's number

11. Fluid is a substance which offers no resistance to change of
(A) Pressure
(B) Flow
(C) Shape
(D) Volume

12. The pressure less than atmospheric pressure is known as
(A) Suction pressure
(B) Vacuum pressure
(C) Negative gauge pressure
(D) All of these

13. The normal stress in a fluid will be constant in all directions at a point only if
(A) It is incompressible
(B) It has uniform viscosity
(C) It has zero viscosity
(D) It is at rest

14. The power transmitted through a pipe is (where w = Specific weight in N/m3, and Q = Discharge in m3/s)
(A) w × Q × H
(B) w × Q × hf
(C) w × Q (H - hf)
(D) w × Q (H + hf)

15. If ‘w’ is the specific weight of liquid and ‘k’ the depth of any point from the surface, then pressure intensity at that point will be
(A) h
(B) wh
(C) w/h
(D) h/w

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