# FLUID MECHANICS AND HYDRAULICS MCQ PART 4- IES, RRB, GATE AND PSC

## FLUID MECHANICS AND HYDRAULICS MCQ PART 4 Questions

Question No. 1
When a cylindrical vessel containing liquid is resolved, the surface of the liquid takes the shape of
(A) A triangle
(B) A paraboloid
(C) An ellipse
(D) None of these

Question No. 2
Fluid is a substance that
(A) Cannot be subjected to shear forces
(B) Always expands until it fills any container
(C) Has the same shear stress at a point regardless of its motion
(D) Cannot remain at rest under action of any shear force

Question No. 3
The force exerted by a moving fluid on an immersed body is directly proportional to the rate of change of momentum due to the presence of the body. This statement is called
(A) Newton’s law of motion
(B) Newton’s law of cooling
(C) Newton’s law of viscosity
(D) Newton’s law of resistance

Question No. 4
The property of a fluid which enables it to resist tensile stress is known as
(A) Compressibility
(B) Surface tension
(C) Cohesion

Question No. 5
The loss of pressure head in case of laminar flow is proportional to
(A) Velocity
(B) (Velocity)2
(C) (Velocity)3
(D) (Velocity)4
Question No. 6
The surface tension of mercury at normal temperature compared to that of water is
(A) More
(B) Less
(C) Same
(D) More or less depending on size of glass tube

Question No. 7
An air vessel is provided at the summit in a siphon to
(A) Avoid interruption in the flow
(B) Increase discharge
(C) Increase velocity
(D) Maintain pressure difference

Question No. 8
The unit of viscosity is
(A) Metres² per sec
(B) kg-sec/metre
(C) Newton-sec per metre²
(D) Newton-sec per meter

Question No. 9
Select the correct statement
(A) Weber’s number is the ratio of inertia force to elastic force.
(B) Weber’s number is the ratio of gravity force to surface tension force.
(C) Weber’s number is the ratio of viscous force to pressure force.
(D) Weber’s number is the ratio of inertia force to surface tension force.

Question No. 10
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

## FLUID MECHANICS AND HYDRAULICS MCQ PART 4 Answers

Question No 1:   B

Question No 2:   D

Question No 3:   D

Question No 4:  C

Question No 5:  A

Question No 6:  A

Question No 7:  A

Question No 8:  B

Question No 9:  D

Question No 10: A

Read More: Fluid mechanics MCQ PART 1

Read More: Fluid Mechanics MCQ PART 2

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