Hydraulics previous year solved MCQs (As per New Syllabus of SBTE Bihar 4th Semester Diploma in Civil Engineering)

Table of Contents

1. Hydraulics 2018 previous year solved MCQs

2. Hydraulics 2019 previous year solved MCQs

3. Hydraulics 2020 previous year solved MCQs

4. Hydraulics 2021 previous year solved MCQs

5. Hydraulics 2022(New) previous year solved MCQs

6. Hydraulics 2022 previous year solved MCQs

1. Hydraulics 2018 previous year solved MCQs

1. water attains its maximum density at :

a. 0°c

b. 100°c

c. 4°c

d. 114°c

c. 4°c

2. Capillary rise takes place when :

a. adhesion is more than cohesion

b. cohesion is more than adhesion

c. adhesion and cohesion are equal

d. none of the above

a. adhesion is more than cohesion

3. Which of the following relationship is correct ?

a. ν=µ/ρ

b. µ =ν/ρ

c. ν=ρ/µ

d. ν=µρ

4. Hydrostatic pressure intensity at a point inside a fluid at rest depends upon :

a. specific weight of the fluid

b. depth of point from the free surface

c. both a & b

d. viscosity of the fluid

both a & b

5. The pressure diagram for a submerged horizontal plane surface will be:

a. Rectangular

b. Triangular

c. Trapezoidal

d. Circular

b. traingular

6. According to the Pascal's law pressure is same :

a. in all direction

b. only in upward direction

c. only in horizontal direction

b. only in downward direction

a. in all directionr

7. Pressure difference in two pipes is measured by means of:

a. piezometer

b. simple manometer

c. differential manometer

d. Bourdon's pressure gauge

c. differential manomete

8. In a steady state of flow which of the following do not change with time at a particular point :

a. velocity

b. pressure

c. density

d. all of the above

9. The ratio of inertia force to viscous force is known as:

a. Euler's number

b. Froude's number

c. Mach number

d. Reynold's number

10. A grid obtained by drawing a series of stream-lines and equipotential lines is known as:

a. stream tube

b. path line

c. flow lines

d. flow net

11. Bernoulli's theorem is based on the principle of conservation of :

a. Mass

b. Energy

c. Force

d. Momentum

b. energy

12. According to Darcy-Weisbach formula, the loss of head due to friction in a pipe is :

a. flV²/2gD

b. flV/2gD

c. flV²/gD

d. flV/gD

13. Moody's diagram can be used to determine :

a. length of pipe

b. diameter of the pipe

c. velocity of the flow

d. friction factor

14. The loss of head at the exit from a pipe is given as :

a. V²/2g

b. 0.5V²/2g

c. 2V²/g

d. V/2g

15. Total Energy Line (TEL) represents the sum of :

a. pressure head and kinetic head

b. pressure head and velocity head

c. pressure head and datum head

d. pressure head, datum head, and kinetic head

16. Water hammer is a phenomenon which is caused by :

a. sudden opening of a valve in a pipe line

b. gradual opening of a valve in a pipe line

c. sudden closure of a valve in a pipe line

d. the pipe material

c. sudden closure of a valve in a pipe line

17. According to Chezy's equation the velocity of flow in an open channel is :

a. V=C√RS

b. V=CRS

c. V= R√CS

d. V=S√RC

a. V=C√RS

18. A hydraulic jump formed when :

a. the flow changes from subcritical state to supercritical state

b. the flow changes from supercritical state to subcritical state

c. the flow remains in critical state

d. the flow remain in subcritical state

b. the flow changes from supercritical state to subcritical state

19. Pitot tube is used to measure :

a. The velocity of flow

b. The discharge

c. Rate of flow

d. The energy of flow

a. The velocity of flow

20. The discharge of an open channel can be measured by a :

a. Notch

b. Venturimeter

c. Pitot tube

d. Piezometer

a. Notch

2. Hydraulics 2019 previous year solved MCQs

1. Poise is the unit of :

a. velocity

b. Mass density

c. Kinematic viscosity

d. Viscosity

2. The points of applications of resultant pressure on the surface is called :

a. Intensity of pressure

b. Centroid

c. Centre of pressure

d. None of these

c. Centre of pressure

3. Real fluid is one which is :

a. Compressible and has viscosity & surface tension

b. Compressible and has no viscosity & surface tension

c. Incompressible and has no viscosity & surface tension

d. Incompressible and has viscosity & surface tension

a. Compressible and has viscosity & surface tension

4. A pressure of 10m of head of oil (Sp. gr 0.85) is equal to :

a. 83385 KN/m2

b. 83.385 KN/m2

c. 833.85 KN/m2

d. 8.3385 KN/m2

c. 833.85 KN/m2

5. Piezometer can not be used to measure :

a. Pressure of a liquid

b. Pressure of a gas

c. Negative pressure

d. Both b & c

6. Manometer is suitable for measuring:

a. Only low pressure

b. Only high pressure

c. Both high & low pressure

d. Only negative pressure

c. Both high & low pressure

7. Which of the following equation is based on conservation of mass?

a. Momentum equation

b. Continuity equation

c. Bernaulli's equation

d. All of the above

b. Continuity equation

8. Reynold's number is the ratio of

a. Viscous force to inertia force

b. Inertia force to elastic force

c. Gravity force to inertia force

d. Inertia force to viscous force

9. Venturimeter is used for measurement of :

a. Average velocity

b. Discharge

c. Velocity at a point

d. Pressure at a pointe

b. Discharge

10. An orifice is said to be large if :

a. Size of orifice is large

b. Velocity of flow is large

c. Available head of liquid is less than 5 times the height of orifice

d. Available head of liquid is more than 5 times the height of orifice

c. Available head of liquid is less than 5 times the height of orifice

11. Notch is a device used for measuring :

a. Rate of flow through a small channel

b. Rate of flow through a pipe

c. Velocity through a small channel

d. Velocity through a pipe

a. Rate of flow through a small channel

12. In order to avoid tendency of separation at the throat in a Venturimeter, the ratio of diameter at throat to that of pipe should be.

a. 1/16 to 1/8

b. 1/14 to 1/7

c. 1/12 to 1/6

d. 1/3 to 1/2

13. Loss due to friction in a pipe is :

a. Directly proportional to the diameter of pipe

b. Directly proportional to the square of the velocity

c. Directly proportional to the length of pipe

d. Inversely proportional to the velocity

b. Directly proportional to the square of the velocity

15. If V=velocity of pipe acceleration due to gravity, V²/2g is the measure of head loss at the

a. Bend of pipe

b. Sudden enlargement of pipe

c. Entrance to a pipe

d. Exit from a pipe

16. The total energy line lies over the hydraulic gradient line by an amount equal to :

a. V²/g

b. V²/2g

c. V/g

d. V/2g

b. V²/2g

17. In open channel water is flow under :

a. Atmospheric pressure

b. Static pressure

c. Atmospheric pressure & Static pressure

d. None of these

a. Atmospheric pressure

18. If fraude's number is more than 1, the flow is :

a. subcritical flow

b. critical flow

c. stream flow

d. shooting flow

19. Reaction turbine is used for :

a. Low pressure

b. High pressure

c. High pressure and high discharge

d. Low pressure and high discharge

20. Piston or plunger is a part of :

a. Impulse turbine

b. Reaction turbine

c. Reciprocating pump

d. Centrifugal pump

c. Reciprocating pump

3. Hydraulics 2020 previous year solved MCQs

1. Fluid is a substance which does not resist the change of :

a. Pressure

b. Shape

c. Volume

d. Flow

2. The falling drop of water becomes spherical due to :

a. Viscosity of water

b. Capillarity of water

c. Compressibility of water

d. Surface tension of water

3. By increasing temperature, the kinematic viscosity of liquid :

a. Increase

b. Decrease

c. Remains unchanged

d. none of the above

b. Decrease

4. The mass per unit volume of a liquid at standard temperature and pressure is called :

a. Specific weight

b. Specific gravity

c. Specific density

d. Mass density

5. The distance between the centre of pressure and centre of gravity of a vertically immersed surface is :

a. IG/x̅

b. IG/A

c. IG/Ax̅

d. Ax̅/IG

c. IG/Ax̅

6. If at 4°C, the pressure head of water is 80m, the pressure head of oil relative density of 0.8 is :

a. 10m

b. 80m

c. 64m

d. 100m

a. 10m

7. The pressure diagram for a submerged horizontal plane surface will be :

a. Rectangular

b. Triangular

c. Circular

d. Square

b. Triangular

8. A vertical wall is subjected to a pressure due to one kind of liquid for a depth H on one of its side. The total pressure acts at a distance of :

a. H/3 from liquid surface

b. H/2 from liquid surface

c. 2H/3 from liquid surface

d. 3H/4 from liquid surface

c. 2H/3 from liquid surface

9. The numerical value of 1Pa of pressure is equal to :

a. 1 N/m²

b. 1 N/cm²

c. 1KN/m²

d. 1MN/m²

a. 1 N/m²

10. A manometer is used to measure :

a. Positive pressure

b. Negative pressure

c. Gauge pressure

d. All of the above

11. The velocity of liquid flowing through the divergent portion of Venturimeter :

a. Remains constant

b. Increase

c. Decrease

d. None of the above

c. Decrease

12. Hydraulic coefficient of an orifice means :

a. Coefficient of velocity

b. Coefficient of contraction

c. Coefficient of discharge

d. All of the above

13. Bernoulli's equation is applied for :

a. Venturimeter

b. Orifice meter

c. Pitot tube

d. All of the above

14. The equation of continuity of flow is true when the flow is :

a. Unsteady

b. Compressible

c. One dimensional

d. All of the above

c. One dimensional

15. In case of flow through parallel pipes :

a. Loss of head for all pipes is same

b. Total discharge is equal to the suddenly dischargeable for all pipes

c. Total loss of head is equal to sum of loss of head in all pipes

d. Both a & b

16. Head loss in friction is governed by :

a. Darcy's law

b. French's law

c. Chezy's law

d. None of the above

a. Darcy's law

17. The critical depth is the depth of flow at which specific energy is :

a. Maximum

b. Minimum

c. More

d. None of the above

b. Minimum

18. A channel is said to be most economical section, if for a given cross sectional area and bed slope, it :

a. Involves less excavation

b. Given maximum discharge

c. Has minimum wetted perimeter

d. All of the above

19. In centrifugal pump, the liquid enters :

a. At the centre

b. At the top

c. At the bottom

d. From sides

a. At the centre

20. An impulse turbine is used for :

a. Low head of water

b. Medium head of water

c. High head of water

d. None of the above

c. High head of water

4. Hydraulics 2021 previous year solved MCQs

1. The mass per unit volume of a liquid at STP is called:

a. Specific weight

b. Specific gravity

c. Specific volume

d. Specific mass

2. The fluid which is incompressible and non- viscous is termed as :

a. Real fluid

b. Ideal fluid

c. Practical fluid

d. Non-Newtonian fluid

b. Ideal fluid

3. Vacuum pressure means pressure :

a. Above atmospheric pressure

b. Below atmospheric pressure

c. Above gauge pressure

d. none of the above

b. Below atmospheric pressure

4. The centre of pressure of an inclined immersed surface is.. :

a. Above the centre of gravity

b. At the centre of gravity

c. Below the centre of gravity

d. none of the above

c. Below the centre of gravity

5. Dimension of Pressure is :

a. [M²L^-1T^-2]

b. [ML^-2T^-2

c. [MLT^-2]

d. [ML^-1T^-2]

6. For shooting flow, the Froude number is..

a. Zero

b. Less than one

c. One

d. Greater than one

7. In most economical trapezoidal channel section, half the top width is equal to :

a. Bottom width of channel

b. Depth of channel

c. Sloping side of channel

d. None of the above

c. Sloping side of channel

8. Bernoulli's equation is based on the principle of conservastion of :

a. Momentum

b. Energy

c. Mass

d. Force

b. Energy

9. The total energy line (TEL) lies over the hydraulic gradient line(HGL) by an amount equal to :

a. Pressure head

b. Velocity head

c. Half of pressure head

d. Half of velocity head

b. Velocity head

10. An impeller is a part of :

a. Centrifugal pump

b. Reciprocating pump

c. Impulse turbine

d. Reaction turbine

a. Centrifugal pump

11. Which of the following is used to raise the level of water in upstream side ?

a. Notch

b. Orifice

c. Mouthpiece

d. Weir

12. A jet of water discharging from a 40mm diameter orifice has a diameter of 32mm at the vena contracta. The coefficient of contraction will be

a. 0.46

b. 0.64

c. 0.78

d. 0.87

b. 0.64

13. The pressure of liquid at throat in a Venturimeter is :

a. Less than the pressure at the convergent cone

b. Equal to the pressure at the convergent cone

c. Greater than the pressure at the convergent cone

d. Greater than the pressure at the divergent cone

a. Less than the pressure at the convergent cone

14. When the entire outlet side of an orifice is under the liquid, it is known as :

a. Orifice discharging force

b. Wholly drowned orifice

c. Partially drowned orifice

d. Notch

b. Wholly drowned orifice

15. The Discharge over a rectangular notch is directly proportional to :

a. H^1/2

b. H

c. H^3/2

d. H^5/2

c. H^3/2

16. The type of flow in which fluid characteristic like velocity, pressure,density etc. do not change with time at a point is called :

a. Steady flow

b. Unsteady flow

c. Uniform flow

d. Non-uniform flow

a. Steady flow

17. Which type of manometer is more sensitive ?

a. Simple manometer

b. Inclined single column manometer

c. Piezometer

d. none of the above

b. Inclined single column manometer

18. 10m of water will produce a pressure intensity of:

a. 9.81 KN/m²

b. 98.1 KN/m²

c. 981 KN/m²

d. 9810 KN/m²

b. 98.1 KN/m²

19. The effective length of a rectangular weir due to both contraction is :

a. L

b. L - 0.2H

c. L - 2H

d. L - 0.1H

b. L - 0.2H

20. Formation of hydraulic jump takes place when flow changes from :

a. Supercritical state to subcritical state

b. Subcritical state to supercritical state

c. Tranquil state to rapid state

d. None of these

a. Supercritical state to subcritical state

5. Hydraulics 2022(New) previous year solved MCQs

1. Fluid is defined one which is

a. is solid like when there is no motion

b. Deforms continuously when subjected to shear stress

c. can not withstand shear

d. none of the above

b. Deforms continuously when subjected to shear stress

2. The ratio of dynamic viscosity to density of fluid is called :

a. kinematic viscosity

b. capillarity

c. surface tenstion

d. none of the above

a. kinematic viscosity

3. The velocity at which the laminar flow stops is known as:

a. velocity of approach

b. high critical velocity

c. lower critical velocity

d. none of the above

c. lower critical velocity

4. Gauge pressure at a point is equal to the absolute pressure……………. the atmospheric pressure :

a. plus

b. minus

c. divided by

d. none of the above

b. minus

5. Which of the following represents steady uniform flow ?

a. flow through a long pipe at constant rate

b. flow through a long time at decreasing rate

c. flow through expanding tube at constant rate

d. none of the above

a. flow through a long pipe at constant rate

6. What is the area of a pipe line which carries 100 m3/s of water with a velocity of 0.25 m/s ?

a. 200 m²

b. 400m²

c. 300m²

d. 100m²

b. 400m²

7. When a highly viscous fluid flows at a very slow rate the flow becomes :

a. turbulent

b. laminar

c. steady

d. uniform

b. laminar

8. Venturimeter works on the basis of

a. Pascal's law

b. Bernoulli's principle

c. Newton's Law

d. Archimedes law

b. Bernoulli's principle

9. Which of the following is a minor loss for flow through pipes :

a. sudden contraction

b. loss at exit

c. loss at entrance

d. all of the above

10. The hydraulic gradient line indicates the variation of which of the following :

a. velocity head in flow direction

b. piezometric head in the direction of flow

c. total energy of flow in the direction of flow

d. none of the above

b. piezometric head in the direction of flow

11. What is the main function of a surge tank :

a. it causes water hammers

b. relieves water hammer

c. supplies water at constant pressure

d. none of the above

b. relieves water hammer

12. In an orifice the coefficient of contraction is defined as the ratio of :

a. theoretical velocity to area of jet at vena contracta

b. velocity of Jet at Vena contracta to area of orifice

c. area of orifice to area of Jet at Vena contracta

d. area of Jet at Vena contracta to area of orifice

13. What will be the hydraulic mean depth for a rectangular section if b is width of section and d is depth of water

a. bd / (2d+b)

b. bd / (d+b)

c. 2bd / (d+b)

d. bd / 2(d+b)

a. bd / (2d+b)

14. Fraude number is the ratio of :

a. inertia force to viscous force

b. inertia force to gravity force

c. bouyancy force to inertia force

d. none of the above

b. inertia force to gravity force

15. For a most economical trapezoidal channel the half of the top width must be equal to :

a. the bed width

b. one sloping side

c. the depth of flow

d. none of the above

b. one sloping side

16. The relation between Manning constant and Chezy constant is given by (Where R= hydraulics mean depth) :

a. C=R^1/6 / N

b. C=R^2/3 / N

c. C=R^1/3 / N

d. none of the above

a. C=R^1/6 / N

17. Reciprocating pump is divided into how many types, based on its cylinders :

a. 0

b. 5

c. 2

d. 3

b. 5

18. The difference in total head of the pump is called :

a. pressure head

b. shaft head

c. manometric head

d. none of these

c. manometric head

19. A centrifugal pump act as a reverse of :

a. outward radial flow reaction turbine

b. pelton turbine

c. inward radial flow reaction turbine

d. none of the above

c. inward radial flow reaction turbine

20. Which type of turbine is a Francis turbine :

a. reaction turbine

b. impulse turbine

c. screw turbine

d. none of the above

a. reaction turbine

6. Hydraulics 2022 previous year solved MCQs

1. An ideal fluid is :

a. Compressible

b. Viscous

c. Incompressible

d. Incompressible and non-viscous

2. Poise is the unit of :

a. Mass density

b. Viscosity

c. Kinematic viscosity

d. Velocity gradient

b. Viscosity

3. Surface tension is defined as :

a. Force per unit area

b. Force per unit length

c. Force per unit volume

d. None of the above

b. Force per unit length

4. Pascal's law states that pressure at a point is equal in all direction :

a. In fluid at rest

b. In a laminar flow

c. In a turbulent flow

d. All of the above

a. In fluid at rest

5. Manometer is used to measure :

a. Velocity of fluid

b. Pressure of fluid

c. Discharge of fluid

d. None of the above

b. Pressure of fluid

6. The coefficient of discharge (C_d) in terms of C_c & C_v is :

a. C_d = C_c x C_v

b. C_d = C_c / C_v

c. C_d = C_v / C_c

d. None of the above

a. C_d = C_c x C_v

7. Orifice are used to measure :

a. Velocity of liquid

b. Discharge of fluid

c. Pressure of fluid

d. None of the above

b. Discharge of fluid

8. Positive gauge pressure is :

a. More than atmospheric pressure

b. Less than atmospheric pressure

c. Equal to the atmospheric pressure

d. None of the above

a. More than atmospheric pressure

9. A weir is a structure used to measure :

a. Discharge of fluid

b. Rate of flow of fluid

c. Volume of fluid passing per second

d. All of the above

10. Hydraulic Gradient Line (HGL) represents the sum of :

a. Pressure head and kinetic head

b. Kinetic head and datum head

c. Pressure head and datum head

d. Kinetic head, pressure head and datum head

c. Pressure head and datum head

11. Froude's number is the ratio of square root of :

a. Inertia force to viscous force

b. Inertia force to gravity force

c. Inertia force to elastic force

d. None of the above

b. Inertia force to gravity force

12. Impeller is a part of :

a. Centrifugal pump

b. Reciprocating pump

c. Reaction turbine

d. Impulse turbine

a. Centrifugal pump

13. Which of the following machine is run by the impact of the free jet of water ?

a. Reaction turbine

b. Impulse turbine

c. Centrifugal pump

d. None of the above

b. Impulse turbine

14. Venturimeter is used to measure :

a. Discharge of flowing fluid through pipe

b. Discharge of flowing fluid through open channel

c. Energy of flowing fluid through pipe

d. Momentum of flowing fluid through pipe

a. Discharge of flowing fluid through pipe

15. According to Chezy's formula, velocity (v) through a channel for a given bed slope (S), hydraulic radius (R) and Chezy's coefficient (C) is :

a. V = C√RS

b. V = R√CS

c. V = S√RC

d. V = √RSC

a. V = C√RS

16. Specific energy of flowing water through an open channel is measured :

a. From the bed of the channel

b. From the free water surface

c. Just below the free water surface

d. None of the above

a. From the bed of the channel

17. The side of a Cipolletti weir have a slope of :

a. 1 horizontal to 4 vertical

b. 4 horizontal to 1 vertical

c. 1 horizontal to 5 vertical

d. 1 horizontal to 3 vertical

a. 1 horizontal to 4 vertical

18. Condition for the most efficient channel section :

a. Wetted perimeter should be maximum

b. Wetted perimeter should be minimum

c. Wetted area should be maximum

d. Wetted area should be minimum

b. Wetted perimeter should be minimum

19. The intensity of pressure at the point in the fluid at rest :

a. Different in different direction

b. Maximum in upward direction

c. Maximum in downward direction

d. Same in all direction

20. Piston or plunger is a part of :

a. Centrifugal pump

b. Impulse turbine

c. Reaction turbine

d. Reciprocating pump

1. Reciprocating pump is divided into how many types, based on its cylinders :

a. 0

b. 5

c. 2

d. 3

b. 5