Hydraulics and Fluid Mechanics MCQ – Set 19

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Q1. Working principle of dead weight pressure gauge tester is based on

(A) Pascal’s law
(B) Dalton’s law of partial pressure
(C) Newton’s law of viscosity
(D) Avogadro’s hypothesis

Answer: (A) Pascal’s law

Q2. Reynold’s number is the ratio of the inertia force to the

(A) Surface tension force
(B) Viscous force
(C) Gravity force
(D) Elastic force

Answer: (B) Viscous force

Q3. The upper surface of a weir over which water flows is known is

(A) Crest
(B) Nappy
(C) Sill
(D) Weir top

Answer: (C) Sill

Q4. If the depth of water in an open channel is greater than the critical depth, the flow is called

(A) Critical flow
(B) Turbulent flow
(C) Tranquil flow
(D) Torrential flow

Answer: (C) Tranquil flow

Q5. In an internal mouthpiece, the absolute pressure head at vena contracta is __ the atmospheric pressure head by an amount equal to height of the liquid above the vena contracta.

(A) Less than
(B) More than
(C) Equal to
(D) None of these

Answer: (A) Less than

Q6. A flow in which the quantity of liquid flowing per second is constant, is called __ flow.

(A) Steady
(B) Streamline
(C) Turbulent
(D) Unsteady

Answer: (A) Steady

Q7. A point, in a compressible flow where the velocity of fluid is zero, is called

(A) Critical point
(B) Vena contracta
(C) Stagnation point
(D) None of these

Answer: (C) Stagnation point

Q8. According to equation of continuity,

(A) w1a1 = w2a2
(B) w1v1 = w2v2
(C) a1v1 = a2v2
(D) a1/v1 = a2/v2

Answer: (C) a1v1 = a2v2

Q9. The power transmitted through the nozzle is maximum when the head lost due to friction in the pipe is __ of the total supply head.

(A) One-half
(B) One-third
(C) Two-third
(D) None of these

Answer: (B) One-third

Q10. The product of mass and acceleration of flowing liquid is called

(A) Inertia force
(B) Viscous force
(C) Gravity force
(D) Pressure force

Answer: (A) Inertia force

Q11. The body will float if the force of buoyancy is __ the weight of the liquid displaced.

(A) Equal to
(B) Less than
(C) More than
(D) None of these

Answer: (C) More than

Q12. The process of diffusion of one liquid into the other through a semi permeable membrane is called

(A) Viscosity
(B) Osmosis
(C) Surface tension
(D) Cohesion

Answer: (B) Osmosis

Q13. Choose the wrong statement

(A) Any weight, floating or immersed in a liquid, is acted upon by a buoyant force
(B) Buoyant force is equal to the weight of the liquid displaced
(C) The point through which buoyant force acts, is called the center of buoyancy
(D) Center of buoyancy is located above the center of gravity of the displaced liquid

Answer: (D) Center of buoyancy is located above the center of gravity of the displaced liquid

Q14. The atmospheric pressure at sea level is

(A) 103 kN/m2
(B) 10.3 m of water
(C) 760 mm of mercury
(D) All of these

Answer: (D) All of these

Q15. Rotameter is a device used to measure

(A) Absolute pressure
(B) Velocity of fluid
(C) Flow
(D) Rotation

Answer: (C) Flow

Q16. The meatcentric height of a ship is 0.6 m and the radius of gyration is 4 m. The time of rolling of a ship is

(A) 4.1 sec
(B) 5.2 sec
(C) 10.4 sec
(D) 14.1 sec

Answer: (C) 10.4 sec

Q17. A piece weighing 3 kg in air was found to weigh 2.5 kg when submerged in water. Its specific gravity is

(A) 1
(B) 5
(C) 7
(D) 6

Answer: (D) 6

Q18. One cubic metre of water weighs

(A) 100 liters
(B) 250 liters
(C) 500 liters
(D) 1000 liters

Answer: (D) 1000 liters

Q19. When a cylindrical vessel, containing some liquid, is rotated about its vertical axis, the liquid surface is depressed down at the axis of its rotation and rises up near the walls of the vessel on all sides. This type of flow is known as

(A) Steady flow
(B) Turbulent flow
(C) Vortex flow
(D) Uniform flow

Answer: (C) Vortex flow

Q20. An odd shaped body weighing 7.5 kg and occupying 0.01 m3 volume will be completely submerged in a fluid having specific gravity of

(A) 1
(B) 1.2
(C) 0.8
(D) 0.75

Answer: (D) 0.75

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