### Civil Engineering - Hydraulics MCQs Part 6

1. In flowing liquids pitot tubes are used measure

A.

discharge

discharge

B.

pressure

pressure

C.

velocity

velocity

D.

depth.

depth.

**Answer Option C**

2. Capillary rise of water is

A.

directly proportional to surface tension

directly proportional to surface tension

B.

inversely proportional to water density

inversely proportional to water density

C.

inversely proportional to diameter of the tube

inversely proportional to diameter of the tube

D.

All of these.

All of these.

**Answer Option D**

3. A water tank partially filled with water is being carried on a truck moving with a constant horizontal acceleration. The level of the water

A.

rises on the front side of the tank

rises on the front side of the tank

B.

falls on the back side of the tank

falls on the back side of the tank

C.

remains the same at both sides of the tank

remains the same at both sides of the tank

D.

rises on the back side and falls on the front side

rises on the back side and falls on the front side

E.

none of these.

none of these.

**Answer Option D**

4. The dimensional formula of force is

A.

MLT-2

MLT-2

B.

M-1LT2

M-1LT2

C.

ML-2T

ML-2T

D.

M-1L2T-2

M-1L2T-2

E.

none of these.

none of these.

**Answer Option A**

5. An error of 1% in measuring the head of water over the crest of a rectangular weir, produces an error in the discharge which is equal to

A.

1.25%

1.25%

B.

1.5%

1.5%

C.

1.75%

1.75%

D.

2.25%

2.25%

**Answer Option B**

6. Orifice-meter is used to measure

A. pressure at the point

B. discharge

C. average speed

D. velocity.

**Answer Option B**

7. Pick up the correct statement from the following :

A. Dimensional homogeneity means the dimensions of each term in an equation on both sides are equal

B. Dimensionally homogeneous equations are independent of the system of units

C. In dimensionally homogeneous equation, the powers of fundamental dimensions on either side of the equation are identical

D. All the above.

**Answer Option D**

8. The ratio of inertia force of a flowing fluid and the viscous force of the liquid is called :

A. Renold's number

B. Froude's number

C. Euler's number

D. Weber's number.

**Answer Option A**

9. For an irrotational flow, the equation is given by

A. Cauchy-Riemann

B. Reynold

C. Laplaces

D. Bernoulli.

**Answer Option C**

10. Water belongs to

A. Newtonian fluids

B. non-Newtonian fluids

C. compressible fluid

D. none of these.

**Answer Option A**

11. Hydraulic radius is equal to

A. area divided by the square of wetted perimeter

B. area divided by wetted perimeter

C. wetted perimeter divided by area

D. square root of the area.

**Answer Option B**

12. The discharg formula Q = Cd 2gH x A is used for rectangular

A. small orifices only

B. large orifices only

C. small and large orifices only

D. for all types of orifices.

**Answer Option B**

13. Chezy's constant is suggested by

A. Bazin

B. Kutter

C. Manning

D. Powell.

**Answer Option A**

14. The acceleration f required to accelerate a rectangular tank containing water horizontally so that the slope of its free surface is 45°, is

A. g/2

B. g

C. 2 g

D. 2.5 g

E. 3 g.

**Answer Option B**

15. Pick up the correct statement from the following :

A. The fluids which follow are known as Newtonian fluids

B. The fluids which do not follow the linear relationship between shear and rate of strain are known as non Newtonian fluids

C. The substances which flow after yield strains, are known as plastics

D. all the above.

**Answer Option D**

16. For solving network problems of pipes, necessary condition is

A. continuity equation

B. energy equation

C. Darcy-Weisbach equation

D. all the above.

**Answer Option D**

17. In a fluid flow a particle may posses

A. elevation energy

B. kinetic energy

C. pressure energy

D. initial energy

E. all the above.

**Answer Option E**

18. In two dimensional flow the components of velocity are given by u = ax; v = by. The stream lines will be

A. circular

B. parabolic

C. hyperbolic

D. elliptical.

**Answer Option C**

19. The discharge through a V-notch weir varies as

A. H

B. 1/H

C. H3/2

D. H7/2

E. H5/2.

**Answer Option D**

20. For a most economical rectangular channel, the hydraulic mean depth, is equal to

A. the depth of flow

B. half the depth of flow

C. one-third depth of flow

D. None of these.

**Answer Option B**

21. The instrument used for measuring the velocity of flow, is known as

A. venturimeter

B. orifice meter

C. pitot tube

D. none of these.

**Answer Option C**

22. For a long pipe, the head loss

A. at the entrance is ignored

B. at the outlet is ignored

C. at the entrance and outlet both are ignored

D. due to friction is ignored.

**Answer Option C**

23. On a flow net diagram, the distance between two consecutive steam lines at two successive sections are 1 cm and 0.5 cm respectively. If the velocity at the first section is 1 m/sec, the velocity at the second is

A. 1.0 m/sec

B. 0.5 m/sec

C. 2.0 m/sec

D. 2.5 m/sec

E. 3 m/sec.

**Answer Option C**

24. If L, D and f are the length, diameter and coefficient of friction of a pipe, the ratio of the areas of the pipe A and nozzle a, to transmit maximum power, is

A.

B.

C.

D.

**Answer Option D**

25. The flow is called rotational if its velocity normal to the plane of area is equal to

A. angular velocity vector

B. twice the angular velocity vector

C. thrice the angular velocity vector

D. none of these.

**Answer Option B**

26. Flow of water in pipes of diameter more than 3 metres, can be measured by

A. pitot tube

B. venturimeter

C. orifice plate

D. rotameter.

**Answer Option D**

27. The pressure variation along the radial direction for vortex flow along a horizontal plane is related by

A.

B.

C.

D.

**Answer Option B**

28. Hydraulic grade line

A. remains above the centre line of conduit

B. remains below the centre line of conduit

C. remains parallel to the centre line of conduit

D. may be above or below the centre line of conduit.

**Answer Option D**

29. If the Mach number for a fluid flow is less than 1, the flow is

A. sonic

B. supersonic

C. sub-sonic

D. none of these.

**Answer Option C**

30. Hydraulic coefficient of an orifice means the coefficient of

A. velocity

B. contraction

C. resistance

D. all the above.

**Answer Option D**

31. The minimum specific energy of flow of water in open channel is : (where hc is the critical depth)

A. hc

B.

C.

D. hc

**Answer Option C**

32. In a venturimeter, the divergent cone is kept

A. shorter than convergent cone

B. equal to covergent cone

C. longer than convergent cone

D. none of these.

**Answer Option C**

33. Specific weight of sea water is more than that of pure water because of

A. dissolved air

B. dissolved salts

C. suspended matter

D. all the above.

**Answer Option D**

34. Total pressure on the top of a closed cylindrical vessesl completely filled with liquid, is directly proportional to

A. radius

B. (radius)2

C. (radius)3

D. (radius)4

E. none of these.

**Answer Option D**

35. Energy equation is usually applicable to

A. non-uniform flow

B. turbulent flow

C. laminar flow

D. steady flow.

**Answer Option D**

36. Poise is the unit of

A. viscosity

B. velocity gradient

C. mass density

D. kinematic viscous.

**Answer Option A**

37. For mountaneous regions having steep slope, wagons for carrying liquid are made with bottom

A. parallel to the road surface

B. parallel to the horizontal surface

C. inclined upward while moving upwards

D. inclined downward while moving downwards.

**Answer Option B**

38. Specific energy of a flowing fluid per unit weight is

A.

B.

C.

D.

**Answer Option C**

39. The upper surface of the weir over which water flows, is known as

A. vein

B. nappe

C. sill

D. none of these.

**Answer Option C**

40. The ratio of the inertia and viscous forces acting in any flow, ignoring other forces, is called

A. Euler number

B. Frode number

C. Reynold number

D. Weber number.

**Answer Option C**

41. Discharge with velocity of approach, over a rectangular weir is

A. Cd x L x 2g [(H + ha)3/2 + ha3/2]

B. Cd x L x 2g [(H + ha)3/2 - ha3/2]

C. Cd x L x 2g [(H - ha)3/2 + ha3/2]

D. Cd x L x 2g [(H - ha)3/2 - ha3/2]

**Answer Option B**

42. To avoid the tendency of separation of liquid flow, the most suitable ratio of the diameters of the throat and the pipe, is

A. 1/4 to 1/8

B. 1/3 to 1/2

C. 1/2 to 3/4.

D. none of these.

**Answer Option B**

6. Orifice-meter is used to measure

A. pressure at the point

B. discharge

C. average speed

D. velocity.

**Answer Option B**

7. Pick up the correct statement from the following :

A. Dimensional homogeneity means the dimensions of each term in an equation on both sides are equal

B. Dimensionally homogeneous equations are independent of the system of units

C. In dimensionally homogeneous equation, the powers of fundamental dimensions on either side of the equation are identical

D. All the above.

**Answer Option D**

8. The ratio of inertia force of a flowing fluid and the viscous force of the liquid is called :

A. Renold's number

B. Froude's number

C. Euler's number

D. Weber's number.

**Answer Option A**

9. For an irrotational flow, the equation is given by

A. Cauchy-Riemann

B. Reynold

C. Laplaces

D. Bernoulli.

**Answer Option C**

10. Water belongs to

A. Newtonian fluids

B. non-Newtonian fluids

C. compressible fluid

D. none of these.

**Answer Option A**

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