# Hydraulics MCQ Questions & Answers

Hydraulics MCQs : This section focuses on the "Hydraulics". These Multiple Choice Questions (MCQs) should be practiced to improve the Hydraulics skills required for various interviews (campus interview, walk-in interview, company interview), placement, entrance exam and other competitive examinations.

Question 1

If the atmospheric pressure on the surface of an oil tank (sp. gr. 0.8) is 0.1 kg/cm2, the pressure at a depth of 2.5 m, is

A. 1 metre of water
B. 2 metres of water
C. 3 metres of water
D. 3.5 metres of water

Question 2

An ideal flow of a liquid obeys

A. Continuity equation
B. Newton's law of viscosity
C. Newton's second law of motion
D. dynamic viscosity law,

Question 3

Unit of kinematic viscosity is

A. m2/sec
B. Newton sec/m2
C. Newton sec/m3
D. Kg sec/m2.

Question 4

A short tube mouthpiece will not run full at its outlet if the head under which the orifice works, is

A. less than 12.2 m of the water
B. more than 12.2 m of the water
C. equal of 12.2 m of water
D. none of these.

Question 5

The side slope of Cipolletti weir is generally kept

A. 1 to 4
B. 1 to 3
C. 1 to 2
D. 01:05

Question 6

An independent mass of a fluid does not posses

A. elevation energy
B. kinetic energy
C. pressure energy
D. none of these.

Question 7

Differential manometers are used to measure

A. pressure in water channels, pipes, etc.
B. difference in pressure at two points
C. atmospheric pressure
D. very low pressure.

Question 8

The ratio of maximum velocity to average velocity of viscous fluid through a circular pipe is

A. 0.5
B. 0.75
C. 1.25
D. 2

Question 9

A tank 4m x 3m x 2m containing an oil of specific gravity 0.83 is moved with an acceleration g/2 m sec2. The ratio of the pressures at its bottom when it is moving vertically up and down, is

A. 2
B. 3
C. 01-Feb
D. 01-Mar

Question 10

If the volume of a liquid weighing 3000 kg is 4 cubic metres, 0.75 is its

A. specific weight
B. specific mass
C. specific gravity
D. none of these.

Question 11

A pipe of 0.1 m2 cross sectional area suddenly enlarges to 0.3 m2 cross-sectional area. If the discharge of the pipe is 0.3 m3 /sec, the head loss is

A. 2/g m of water
B. g/2 m of water
C. 1g m of water
D. g m of water.

Question 12

Pick up the correct statement from the following :

A. For tranquil flow h > 2g or v <
B. For critical flow
C. For torrential flow h > or v < gh
D. None of these.

Question 13

A pitot tube is used to measure

A. pressure
B. difference in pressure
C. velocity of flow
D. none of these.

Question 14

The maximum vacuum created at the summit of a syphon is

A. 2.7 m of water
B. 7.4 m of water
C. 5.5 m of water
D. none.

Question 15

A syphon is used

A. to connect water reservoirs at different levels intervened by a hill
B. to supply water to a town from higher level to lower level
C. to fill up a tank with water at higher level from a lower level
D. none of these.

Question 16

Reynold number is the ratio of initial force and

A. viscosity
B. elasticity
C. gravitational force
D. surface tension.

Question 17

The total pressure force on a plane area is equal to the area multiplied by the intensity of pressure at its centroid, if

A. area is horizontal
B. area is vertical
C. area is inclined
D. all the above.

Question 18

The phenomenon occuring in an open channel when a rapidly flowing stream abruptly changes to a slowly flowing stream causing a distinct rise of liquid surface, is

A. water hammer
B. hydraulic jump
C. critical discharge
D. none of these.

Question 19

The radius of gyration of the water line of a floating ship is 4 m and its metacentric height is 72.5 cm. The period of oscillation of the ship, is

A. π
B. 2π
C. 3π
D. 4π

Question 20

The thickness of a sharp crested weir is kept less than

A. one-third of the height of water on the sill
B. one-half of the height of water on the sill
C. one-fourth of the height of water on the sill
D. two-third of the height of water on the sill

Question 21

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

A. weight of liquid vertically below the curved surface
B. force on a vetical projection of the curved surface
C. product of pressure at its centroid and the area
D. weight of liquid retained by the curved area.

Question 22

If the total head of the nozzle of a pipe is 37.5 m and discharge is 1 cumec, the power generated is

A. 400 H.P.
B. 450 H.P.
C. 500 H.P.
D. 550 H.P.

Question 23

When a body is totally or partially immersed in a fluid, it is buoyed up by a force equal to

A. weight of the body
B. weight of the fluid displaced by the body
C. weight of the body and fluild displaced by the body
D. difference of weights of the fluid displaced and that of the body

Question 24

Highest dam in India, is

A. Bhakra dam
B. Hirakund dam
C. Nagarjuna Sagar dam
D. Iddiki dam.

Question 25

The shear stress distribution in viscous fluid through a circular pipe is :

A. maximum at the centre
B. maximum at the inside of surface
C. same throughout the section
D. none of these.

Question 26

A piezometer opening in pipes measures

B. static pressure
C. total pressure
D. negative static pressure.

Question 27

The momentum correction factor (β) for the viscous flow through a circular pipe is

A. 1.25
B. 1.33
C. 1.5
D. 1.66