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Essential Hydraulics MCQs for JDO Exam Success

1. If the diameter of a capillary tube is doubled, the capillary rise will be:

(a) Unaffected

(b) Doubled

(c) Halved

(d) None of the above

Answer: c

2. The rotation of a bucket containing water and rotating about its vertical axis at constant speed shall produce:

(a) Free vortex

(b) Forced vortex

(c) Both of the above depending on the speed of rotation

(d) None of the above

Answer: b

3. The hydraulic grade line is:

(a) Always above the center line of pipe

(b) Never above the energy grade line

(c) Always sloping downward in the direction of flow

(d) All of the above

Answer: b

4. In defining the Froude number applicable to channels of any shape, the length parameter used is the:

(a) Depth of flow

(b) Hydraulic radius

(c) Wetted perimeter

(d) Ratio of area to top width

Answer: d

5. The flow in open channel is turbulent if the Reynolds number is:

(a) 2000

(b) More than 2000

(c) More than 4000

(d) 4000

Answer: b

6. The term 'alternate depths' in open channel flow refers to the:

(a) Depths having the same specific energy for a given discharge.

(b) Depth before and after the passage of the surge.

(c) Depth having the same kinetic energy for a given discharge.

(d) Depth on either side of a hydraulic jump.

Answer: a

7. In open channels, maximum velocity occurs:

(a) Just below the free surface

(b) At the surface

(c) Near the channel bottom

(d) In the mid-depth of flow

Answer: a

8. Flow of water through a passage under atmosphere pressure is called:

(a) Pipe flow

(b) Uniform flow

(c) Open channel flow

(d) Non uniform flow

Answer: c

9. The dimensions of Chezy's C is:

(a) Non-dimensional

(b) L/T

(c) LT

(d) [L/T-2]1/2

Answer: d

10. The hydraulic radius is given by:

(a) Wetted perimeter divided by area

(b) Area divided by square of wetted perimeter

(c) Area divided by wetted perimeter

(d) Square root of area

Answer: c