Fluid Mechanics Objective Type Questions - Set 13 - ObjectiveBooks

# Practice Test: Question Set - 13

1. The fluid forces considered in the Navier Stokes equation are
(A) Gravity, pressure and viscous
(B) Gravity, pressure and turbulent
(C) Pressure, viscous and turbulent
(D) Gravity, viscous and turbulent

2. When the Venturimeter is inclined, then for a given flow it will show __________ reading.
(A) Same
(B) More
(C) Less
(D) None of these

3. Cavitation is caused by
(A) High velocity
(B) High pressure
(C) Weak material
(D) Low pressure

4. A vertical wall is subjected to a pressure due to one kind of liquid, on one of its sides. The total pressure on the wall acts at a distance __________ from the liquid surface.
(A) H/3
(B) H/2
(C) 2H/3
(D) 3H/4

5. An ideal flow of any fluid must fulfill the following
(A) Newton's law of motion
(B) Newton's law of viscosity
(C) Pascal' law
(D) Continuity equation

6. The flow in a pipe or channel is said to be 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

7. Surface tension
(A) Acts in the plane of the interface normal to any line in the surface
(B) Is also known as capillarity
(C) Is a function of the curvature of the interface
(D) Decreases with fall in temperature

8. Select the wrong statement
(A) An equivalent pipe is treated as an ordinary pipe for all calculations
(B) The length of an equivalent pipe is equal to that of a compound pipe
(C) The discharge through an equivalent pipe is equal to that of a compound pipe
(D) The diameter of an equivalent pipe is equal to that of a compound pipe

9. Alcohol is used in manometers because
(A) It has low vapour pressure
(B) It is clearly visible
(C) It has low surface tension
(D) It can provide longer column due to low density

10. The discharge through a wholly drowned orifice is given by (where H1 = Height of water (on the upstream side) above the top of the orifice, H2 = Height of water (on the downstream side) above the bottom of the orifice, and H = Difference between two water levels on either side of the orifice)
(A) Q = Cd × bH₁ × √(2gh)
(B) Q = Cd × bH2 × √(2gh)
(C) Q = Cd × b (H2 - H1) × √(2gh)
(D) Q = Cd × bH × √(2gh)

11. If no resistance is encountered by displacement, such a substance is known as
(A) Fluid
(B) Water
(C) Gas
(D) Ideal fluid

12. The kinematic viscosity is the
(A) Ratio of absolute viscosity to the density of the liquid
(B) Ratio of density of the liquid to the absolute viscosity
(C) Product of absolute viscosity and density of the liquid
(D) Product of absolute viscosity and mass of the liquid

13. Choose the correct relationship
(A) Specific gravity = gravity × density
(B) Dynamic viscosity = kinematic viscosity × density
(C) Gravity = specific gravity × density
(D) Kinematic viscosity = dynamic viscosity × density

14. The viscosity of water is __________ than that of mercury.
(A) Higher
(B) Lower
(C) Same as
(D) None of these

15. Surface energy per unit area of a surface is numerically equal to
(A) Atmospheric pressure
(B) Surface tension