Fluid Mechanics online Practice Tests - Set 16

Practice Test: Question Set - 16

1. In an internal mouthpiece, if the jet after contraction does not touch the sides of the mouthpiece, then the mouthpiece is said to be
    (A) Running full
    (B) Running free
    (C) Partially running full
    (D) Partially running free

2. The units of kinematic viscosity are
    (A) Metres² per sec
    (B) kg sec/metre
    (C) Newton-sec per metre
    (D) Newton-sec per metre

3. The length of a liquid stream while flowing over a weir __________ at the ends of the sill.
    (A) Expands
    (B) Does not change
    (C) Contracts
    (D) None of these

4. Newton's law of viscosity is a relationship between
    (A) Shear stress and the rate of angular distortion
    (B) Shear stress and viscosity
    (C) Shear stress, velocity and viscosity
    (D) Pressure, velocity and viscosity

5. The total energy line lies over the hydraulic gradient line by an amount equal to the
    (A) Pressure head
    (B) Velocity head
    (C) Pressure head + velocity head
    (D) Pressure head - velocity head

6. Choose the wrong statement
    (A) The horizontal component of the hydrostatic force on any surface is equal to the normal force on the vertical projection of the surface
    (B) The horizontal component acts through the center of pressure for the vertical projection
    (C) The vertical component of the hydrostatic force on any surface is equal to the weight of the volume of the liquid above the area
    (D) The vertical component passes through the center of pressure of the volume

7. In open channels, the specific energy is the
    (A) Total energy per unit discharge
    (B) Total energy measured with respect to the datum passing through the bottom of the channel
    (C) Total energy measured above the horizontal datum
    (D) Kinetic energy plotted above the free surface of water

8. For a floating body to be in stable equilibrium, its metacentre should be
    (A) Below the center of gravity
    (B) Below the center of buoyancy
    (C) Above the center of buoyancy
    (D) Above the center of gravity

9. A water tank contains 1.3 m deep water. The pressure exerted by the water per metre length of the tank is
    (A) 2.89 kN
    (B) 8.29 kN
    (C) 9.28 kN
    (D) 28.9 kN

10. Total pressure on a lmxlm gate immersed vertically at a depth of 2 m below the free water surface will be
    (A) 1000 kg
    (B) 4000 kg
    (C) 2000 kg
    (D) 8000 kg

11. If a body floating in a liquid occupies a new position and remains at rest in this new position, when given a small angular displacement, the body is said to be in __________ equilibrium.
    (A) Neutral
    (B) Stable
    (C) Unstable
    (D) None of these

12. A streamline is defined as the line
    (A) Parallel to central axis flow
    (B) Parallel to outer surface of pipe
    (C) Of equal velocity in a flow
    (D) Along which the pressure drop is uniform

13. The flow in a pipe or channel is said to be non-uniform when
    (A) The liquid particles at all sections have the same velocities
    (B) The liquid particles at different sections have different velocities
    (C) The quantity of liquid flowing per second is constant
    (D) Each liquid particle has a definite path

14. Hydrometer is used to determine
    (A) Specific gravity of liquids
    (B) Specific gravity of solids
    (C) Specific gravity of gases
    (D) Relative humidity

15. The dynamic viscosity of the liquid __________ with rise in temperature.
    (A) Remain unaffected
    (B) Increases
    (C) Decreases
    (D) None of these

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Hydraulics and Fluid Mechanics:
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