# 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/m^{3}, and*Q*= Discharge in m^{3}/s)- (A)

*w*×

*Q*×

*H*

- (B)

*w*×

*Q*×

*h*

_{f}- (C)

*w*×

*Q*(

*H*-

*h*)

_{f}- (D)

*w*×

*Q*(

*H*+

*h*)

_{f}**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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