# Practice Test: Question Set - 34

1. The unit of surface tension is
(A) N/m
(B) N/m2
(C) N/m3
(D) N-m

2. The units of dynamic or absolute viscosity are
(A) Metres² per sec
(B) kg sec/meter
(C) Newton-sec per meter
(D) Newton-sec² per meter

3. A notch is used to measure __________ of liquids.
(A) Pressure
(B) Discharge
(C) Velocity
(D) Volume

4. Euler's number is the ratio of __________ force to pressure force.
(A) Inertia
(B) Gravity
(C) Viscous
(D) None of these

5. A flow in which the volume of a fluid and its density does not change during the flow is called _________ flow.
(A) Incompressible
(B) Compressible
(C) Viscous
(D) None of these

6. The weight per unit volume of a liquid at a standard temperature and pressure is called
(A) Specific weight
(B) Mass density
(C) Specific gravity
(D) None of these

7. The efficiency of power transmission through pipe is (where H = Total supply head, and hf = Head lost due to friction in the pipe)
(A) (H - hf )/H
(B) H/(H - hf )
(C) (H + hf )/H
(D) H/(H + hf )

8. The error in discharge (dQ/Q) to the error in measurement of head (dH/H) over a rectangular notch is given by
(A) dQ/Q = (1/2) × (dH/H)
(B) dQ/Q = (3/4) × (dH/H)
(C) dQ/Q = (dH/H)
(D) dQ/Q = (3/2) × (dH/H)

9. The flow of water through the hole in the bottom of a wash basin is an example of
(B) Uniform flow
(C) Free vortex
(D) Forced vortex

10. A flow in which the viscosity of fluid is dominating over the inertia force is called
(C) Laminar flow
(D) Turbulent flow

11. 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

12. A flow whose streamline is represented by a curve, is called
(A) One-dimensional flow
(B) Two-dimensional flow
(C) Three-dimensional flow
(D) Four-dimensional flow

13. The value of coefficient of discharge is __________ the value of coefficient of velocity.
(A) Less than
(B) Same as
(C) More than
(D) None of these

14. The hydraulic mean depth for a circular pipe of diameter (d) is
(A) d/6
(B) d/4
(C) d/2
(D) d

15. A fluid whose viscosity does not change with the rate of deformation or shear strain is known as
(A) Real fluid
(B) Ideal fluid
(C) Newtonian fluid
(D) Non-Newtonian fluid

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