Hydraulics and Fluid Mechanics - Set 02 - ObjectiveBooks
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# Practice Test: Question Set - 02

1. A fluid which obeys the Newton's law of viscosity is termed as
(A) Real fluid
(B) Ideal fluid
(C) Newtonian fluid
(D) Non-Newtonian fluid

2. In order that flow takes place between two points in a pipeline, the differential pressure between these points must be more than
(A) Frictional force
(B) Viscosity
(C) Surface friction
(D) All of the above

3. The error in discharge (dQ/Q) to the error in measurement of head (dH/H) over a triangular notch is given by
(A) dQ/Q = 3/2 × (dH/H)
(B) dQ/Q = 2 × (dH/H)
(C) dQ/Q = 5/2 × (dH/H)
(D) dQ/Q = 3 × (dH/H)

4. For similarity, in addition to models being geometrically similar to prototype, the following in both cases should also be equal
(A) Ratio of inertial force to force due to viscosity
(B) Ratio of inertial force to force due to gravitation
(C) Ratio of inertial force to force due to surface tension
(D) All the four ratios of inertial force to force due to viscosity, gravitation, surface tension, and elasticity

5. The value of coefficient of velocity for a sharp edged orifice __________ with the head of water.
(A) Decreases
(B) Increases
(C) Remain same
(D) None of these

6. If cohesion between molecules of a fluid is greater than adhesion between fluid and glass, then the free level of fluid in a dipped glass tube will be
(A) Higher than the surface of liquid
(B) The same as the surface of liquid
(C) Lower than the surface of liquid
(D) Unpredictable

7. The ratio of the inertia force to the __________ is called Euler's number.
(A) Pressure force
(B) Elastic force
(C) Surface tension force
(D) Viscous force

8. A one dimensional flow is one which
(A) Is uniform flow
(C) Takes place in straight lines
(D) Involves zero transverse component of flow

9. According to Manning's formula, the discharge through an open channel is (where M = Manning's constant)
(A) A × M × m1/2 × i2/3
(B) A × M × m2/3 × i1/2
(C) A1/2 × M2/3 × m × i
(D) A2/3 × M1/3 × m × i

10. Dimensions of surface tension are
(A) ML°T⁻²
(B) ML°T
(C) ML r²
(D) ML²T²

11. An opening in the side of a tank or vessel such that the liquid surface with the tank is below the top edge of the opening, is called
(A) Weir
(B) Notch
(C) Orifice
(D) None of these

12. The property of fluid by virtue of which it offers resistance to shear is called
(A) Surface tension
(D) Viscosity

13. Coefficient of velocity is defined as 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) Actual discharge through an orifice to the theoretical discharge
(D) None of the above

14. A liquid compressed in cylinder has a volume of 0.04 m3 at 50 kg/cm² and a volume of 0.039 m3 at 150 kg/cm². The bulk modulus of elasticity of liquid is
(A) 400 kg/cm²
(B) 4000 kg/cm²
(C) 40 × 10⁵ kg/cm²
(D) 40 × 10⁶ kg/cm²

15. The mass of 2.5 m3 of a certain liquid is 2 tonnes. Its mass density is
(A) 200 kg/m3
(B) 400 kg/m3
(C) 600 kg/m3
(D) 800 kg/m3

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