## Hydraulics and Fluid Mechanics Part 1

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Attempt Free Hydraulics and Fluid Mechanics Part 1 Here. Read The Important Civil MCQ From Below.

Q1. The horse power transmitted through a pipe is maximum when the ratio of loss of head due to friction and total head supplied is

A. 1/3

B. 1/4

C. 1/2

D. 2/3

Answer : A

Q2. The correct relationship among displacement thickness d, momentum thickness m and energy thickness e is

A. d > m > e

B. d > e > m

C. e > m > d

D. e > d > m

Answer : D

Hydraulics and Fluid Mechanics Part 1

Q3. For laminar flow in circular pipes, the Darcy’s friction factor f is equal to

A. 16/Re

B. 32/ Re

C. 64/ Re

D. none of the above where R,, is Reynolds number.

Answer : C

Q4. The position of center of pressure on a plane surface immersed vertically in a static mass of fluid is.

A. at the centroid of the submerged area

B. always above the centroid of the area

C. always below the centroid of the area

D. none of the above

Answer : C

Q5. Two pieces of metal when immersed in a liquid have equal outthrust on them, then

A. Both pieces must have equal weights

B. Both pieces must have equal densities

C. Both pieces must have equal volumes

D. Both are floating to the same depth

Answer : C

Hydraulics and Fluid Mechanics Part 1

Q6. The point in the immersed body through which the resultant pressure of the liquid may be taken to act is known as.

A. center of gravity

B. center of buoyancy

C. center of pressure

D. metacentre

Answer : C

Q7. A wooden cylinder floats vertically in water with half of its length immersed. The density of wood is

A. Equal to that of water

B. Half the density of water

C. Double the density of water

D. The question is incomplete

Answer : B

Q8. The horizontal component of force on a curved surface is equal to the.

A. product of pressure intensity at its centroid and area

B. force on a vertical projection of the curved surface

C. weight of liquid vertically above the curved surface

D. force on the horizontal projection of the curved surface

Answer : B

Hydraulics and Fluid Mechanics Part 1

Q9. If in a satellite orbiting the earth, a cork is immersed in a jar of water and released, it will

A. Rise

B. Sink

C. Remain where left

D. None of the above

Answer : C

Q10. Stream lines and path lines always coincide in case of.

A. steady flow

B. steady flow

C. uniform flow

D. turbulent flow

Answer : A

Q11. As ideal fluid is

A. One which obeys Newton’s law of viscosity

B. One which satisfies continuity equation

C. One which flows through pipes with least friction

D. Frictionless and incompressible

Answer : D

Hydraulics and Fluid Mechanics Part 1

Q12. Due to each end contraction, the discharge of rectangular sharp crested weir is reduced by.

A. 5%

B. 10%

C. 15%

D. 20%

Answer : A

Q13. The relationship dp/dx = dz/dy is valid for

A. Irrotational flow

B. Non-uniform flow

C. Uniform flow

D. Unsteady flow

Answer : A

Q14. Coefficient of contraction for an external cylindrical mouthpiece is.

A. 1.00

B. 0.855

C. 0.7H

D. 0.611

Answer : A

Hydraulics and Fluid Mechanics Part 1

Q15. The ratio between inertia force and viscous force is called

A. Reynold’s number

B. Froude’s number

C. Weber’s number

D. Euler’s number

Answer : A