Hydraulics and Fluid Mechanics MCQ – Set 13

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(A) 200 kg/m3
(B) 400 kg/m3
(C) 600 kg/m3
(D) 800 kg/m3

Q2. Choose the wrong statement. Alcohol is used in manometer, because

(A) Its vapour pressure is low
(B) It provides suitable meniscus for the inclined tube
(C) Its density is less
(D) It provides longer length for a given pressure difference

Answer: (A) Its vapour pressure is low

Q3. Newton’s law of viscosity is a relationship between

(A) Pressure, velocity and temperature
(B) Shear stress and rate of shear strain
(C) Shear stress and velocity
(D) Rate of shear strain and temperature

Answer: (B) Shear stress and rate of shear strain

Q4. The point in the immersed body through which the resultant pressure of the liquid may be taken to act is known as

(A) Meta center
(B) Center of pressure
(C) Center of buoyancy
(D) Center of gravity

(A) Mass
(B) Momentum
(C) Energy
(D) Work

Q6. The intensity of pressure on an immersed surface __ with the increase in depth.

(A) Does not change
(B) Increases
(C) Decreases
(D) None of these

Q7. Meta-centric height is given as the distance between

(A) The center of gravity of the body and the metacenter
(B) The center of gravity of the body and the center of buoyancy
(C) The center of gravity of the body and the center of pressure
(D) Center of buoyancy and metacenter

Answer: (A) The center of gravity of the body and the metacenter

Q8. The intensity of pressure at any point, in a liquid, is __ to the depth of liquid from the surface.

(A) Equal
(B) Directly proportional
(C) Inversely proportional
(D) None of these

(A) h
(B) wh
(C) w/h
(D) h/w

Q10. When a liquid is flowing through a pipe, the velocity of the liquid is

(A) Maximum at the centre and minimum near the walls
(B) Minimum at the centre and maximum near the walls
(C) Zero at the centre and maximum near the walls
(D) Maximum at the centre and zero near the walls

Answer: (A) Maximum at the centre and minimum near the walls

Q11. The magnitude of water hammer depends upon the

(A) Elastic properties of the pipe material
(B) Elastic properties of the liquid flowing through the pipe
(C) Speed at which the valve is closed
(D) All of the above

Answer: (D) All of the above

Q12. Surface energy per unit area of a surface is numerically equal to

(A) Atmospheric pressure
(B) Surface tension
(D) Force of cohesion

Q13. The diameter of the nozzle (d) for maximum transmission of power is given by (where D = Diameter of pipe, f = Darcy’s coefficient of friction for pipe, and l = Length of pipe)

(A) d = (D⁵/8fl)1/2
(B) d = (D⁵/8fl)1/3
(C) d = (D⁵/8fl)1/4
(D) d = (D⁵/8fl)1/5

Q14. Property of a fluid by which molecules of different kinds of fluids are attracted to each other is called

(B) Cohesion
(C) Viscosity
(D) Compressibility

Q15. The dynamic viscosity of the liquid __ with rise in temperature.

(A) Remain unaffected
(B) Increases
(C) Decreases
(D) None of these

Q16. The flow in which the particles of a fluid attain such velocities that varies from point to point in magnitude and direction as well as from instant to instant, is known as

(A) One dimensional flow
(B) Uniform flow
(D) Turbulent flow

Q17. For a perfect incompressible liquid, flowing in a continuous stream, the total energy of a particle remains the same, while the particle moves from one point to another. This statement is called

(A) Continuity equation
(B) Bernoulli’s equation
(C) Pascal’s law
(D) Archimedes’s principle

Q18. A large Reynold number is indication of

(A) Smooth and streamline flow
(B) Laminar flow
(D) Highly turbulent flow

(A) w
(B) wh
(C) w/h
(D) h/w