Civil Engineering - Water Resources Engineering MCQs Part 3

1. Water is useful for

A.
running hydroelectric turbines

B.
floating the boats and ships

C.
providing steam for running locomotives

D.
warming dwelling units

E.
all the above.

 Answer Option E

2. Knowledge of hydrology is necessary for civil engineers for

A.
designing and construction of irrigation structures

B.
designing and construction of bridges and culverts

C.
flood control works

D.
all the above.

 Answer Option D

3. Pick up the correct statement from the following :

A.
Run off and surface run off are the same

B.
Run off includes the water flowing over the surface

C.
Run off is sometimes called discharge of the river

D.
Surface run off is sometimes called stream flow.

 Answer Option C

4. Pick up the correct statement from the following :

A.
Yield of a drainage basin is the run off at any time

B.
Yield of a drainage basin is the run off over long periods

C.
Yield of a drainage basin is expressed as surface run off per year

D.
Run off is expressed as total volume per day

E.
None of these.

 Answer Option B

5. Run off includes

A.
precipitation over catchment area of the stream and its attributaries

B.
surface run off

C.
ground water flow

D.
all the above.

 Answer Option D

6. Pick up the correct statement from the following :

A. Hydrograph is a plot of discharge and time

B. In hydrographs, time is plotted on X-axis

C. The maximum flow in the river due to rainfall, is called peak flow

D. Peak flows are different for rainfalls

E. All the above.

 Answer Option E

7. A soil strata may consist of

A. soil zone

B. intermediate zone

C. capillary zone

D. ground water zone

E. all the above.

 Answer Option E

8. Pick up the correct statement from the following :

A. The amount of water retained on the surface of soil grains by molecular attraction, is known as pellicular water

B. The degree of resistance to movement of the pellicular water generally expressed by the surface tension

C. The pellicular water held in any soil, is called field capacity

D. The portion of the pellicular water absorbed by the root action of the vegetation, is called available moisture

E. All the above.

 Answer Option E

9. If the slope of a line for infiltration capacity curve is , the value of constant k in Horton's equation of infiltration capacity curve, is

A. 2.0

B. 2.5

C. 3.0

D. 3.5

E. 4.0.

 Answer Option E

10. The equation P - Q = Te φindex for determining the infiltration capacity, was suggested by

A. Horton

B. Horner

C. Llyod

D. Bernard.

 Answer Option A

11. Pick up the correct statement from the following :

A. If ground water enters the channel, the channel is known as effulent channel

B. If water goes out of channel to meet ground water, the channel is said to be influent stream

C. If the water table is at higher level than the water level in channel, ground water flows to the stream

D. If the water level in stream is higher than the water table level, water from the channel enters into ground water

E. All the above.

 Answer Option E

12. Pressure exerted by fully saturated air, is known

A. partial pressure

B. vapour pressure

C. saturation vapour pressure

D. saturation pressure

E. (c) and (d) of the above.

 Answer Option E

13. A volume of air at constant barometric pressure may be brought to dew point by

A. increasing the temperature

B. decreasing the temperature

C. neither (a) nor (b)

D. both (a) and (b).

 Answer Option B

14. If the dew point is greater than 0°C

A. dew will be formed

B. frost will be formed

C. vapours will be formed

D. neither of these.

 Answer Option A

15. Humidity refers to

A. temperature of the air

B. pressure of the air

C. moisture content of the air

D. volume of the air.

 Answer Option C

16. Relative humidity is the ratio of actual vapour pressure to the saturation vapour pressure

A. at the same temperature

B. at the same pressure

C. in the same volume

D. in the atmosphere.

 Answer Option A

17. Pick up correct statement from the following :

A. The air from outer portion of cyclones gets lifted for causing precipitation

B. The air from central portion of cyclone's gets lifted for causing precipitation

C. The air from entire surface of the cyclones gets lifted for causing precipitation

D. None of those.

 Answer Option B

18. Precipitation caused due to upward movement of warmer air as compared to surrounding air, is called

A. cyclonic precipitation

B. convective precipitation

C. orographic precipitation

D. none of these.

 Answer Option B

19. Precipitation caused due to striking of air masses with a topographical feature, is called

A. orographic precipitation

B. convective precipitation

C. cyclonic precipitation

D. none of these.

 Answer Option A

20. The specifications of most commonly used standard gauges in India, are

A. 200 sq. cm collector and 4 litres bottle

B. 100 sq. cm collector and 2 litres bottle

C. 200 sq. cm collector and 10 litres bottle

D. 100 sq. cm collector and 4 litres bottle.

 Answer Option A

21. Pick up the correct statement from the following :

A. Higher the gauge, more deficient will be the rain catch

B. Heavier the rain, lesser will be the rain catch

C. The trees serving as wind brakes in the vicinity of the gauge, should not subtend angles greater than 45°

D. Coniferrous forest is idealy suited for installing the gauge

E. All the above.

 Answer Option E

22. The respective storm totals at three surrounding stations A, B and C are 110, 90 and 70 mm. If the normal annual precipitation amounts at stations X, A, B and C are respectively 1000, 1100, 1200 and 1250 mm, the estimated storm precipitation at X is

A. 75 mm

B. 77 mm

C. 79 mm

D. 81 mm.

 Answer Option B

23. The area enclosed by the adjacent isohyets of a catchment basin are shown under : The average depth of annual precipitation in the catchment basin will be

A. 60.0 cm

B. 60.5 cm

C. 61.5 cm

D. 62.5 cm

E. 63.5 cm.

 Answer Option E

24. The recurrence interval (R.I.) of 20 cm rain storm at a place is 5 years.

A. The place will definitely have 20 cm rain storm after every five years

B. The place may have 20 cm rain storm after every five years

C. The place may have 20 cm rain storm within a set of 5 years twice

D. None of these.

 Answer Option B

25. Sharp crested weirs are generally used

A. for large flows

B. for small flows

C. for streams carrying high sediment loads

D. for rivers carrying floating debris

E. none of these.

 Answer Option A

26. For efficient working of a control meter, its throat length is approximately kept

A. equal to the critical depth

B. twice the critical depth

C. three times the critical depth

D. four times the critical depth.

 Answer Option C

27. A control meter is preferred to a weir because

A. it measures the discharge even in silt laiden streams

B. the velocity of approach of the channel increases above the control, and thus removes the silt completely

C. it is not damaged by floating debris

D. all the above.

 Answer Option D

28. A river is said to be of uniform section if in its section

A. a segment of a circle can be fitted

B. a parabolic section can be fitted

C. a rectangular section can be fitted

D. a trapezoidal section can be fitted

E. all the above.

 Answer Option E

29. The run off is affected by

A. size of the basin

B. shape of the basin

C. elevation of the water shed

D. all the above.

 Answer Option D

30. The form factor of a drainage basin is obtained by dividing

A. area of the basin by the axial length

B. average width of the basin by the axial basin

C. area of the basin by the square of the axial length

D. both (a) an (b)

E. both (b) and (c).

 Answer Option E

31. The area of a drainage basin whose axial length is 100 km is 2500 sq. km. Its form factor is

A. 0.10

B. 0.20

C. 0.25

D. 0.30

E. 0.35

 Answer Option C

32. If the axial length of a drainage basin is 35 km and its form factor is 0.2, the total area of the basin is

A. 205 sq. km.

B. 215 sq. km.

C. 225 sq. km.

D. 235 sq. km.

E. 245 sq. km.

 Answer Option E

33. The elevation Z of the watershed is : (where letters carry their usual meanings)

A. reduced level of the top most point of the basin

B. reduced level of the lower most point of the basin

C. average elevation of the highest and lowest point of the drainage basin

D. obtained by the formula

 Answer Option D

34. Run off is measured in

A. cubic metres

B. cubic metres per sec.

C. cubic metres per minute

D. cubic metres per hour.

 Answer Option B

35. The rational formula for calculating the discharge, is (where A is the area of basin and Po is one hour rainfall)

A.

B.

C.

D.

 Answer Option C

36. The formula for calculating the overland flow time (To) in hours for any basin, is (where Lo is the distance of the critical point and H is the difference in elevation)

A.

B.

C.

D.

 Answer Option D

37. Pick up the correct statement from the following :

A. The unit hydrograph of a specified unit duration obtained from the past data can be used to obtain the hydrograph of future storms of like duration

B. To obtain the ordinates of storm hydrograph, the ordinates of unit hydrograph are multiplied by the multiplying factor

C. The multiplying factor for storm hydrograph may be obtained by dividing the run off in mm by 25 mm

D. A tolerance of about 25% of specified duration of unit hydrograph may be accepted without any serious error

E. All the above.

 Answer Option E

38. Bernard's distribution graph is a plot of time on X-axis and

A. run off on the y-axis

B. total run off on the y-axis

C. percentage of total surface run off on y-axis

D. percentage of total surface run off during uniform time intervals on y-axis

E. none of these.

 Answer Option D

39. An intense rain is falling at a uniform rate of 7.5 cm/hour for a period of 60 minutes on a basin whose areas is 500 hectares. If the average infiltration capacity during the entire rain period is assumed to be 1.5 cm/hr, the maximum run-off rate based on 10 minute peak percentage of 16% from distributing graph of the basin, is

A. 40 cumecs

B. 60 cumecs

C. 80 cumecs

D. 100 cumecs.

 Answer Option C

40. Pick up the correct statement from the following :

A. The ratio of total volume of voids in soil aggregates to the total volume of aggregate, is called Porosity

B. Water retained by the interstices due to molecular attraction, is called pellicular water

C. The ratio of volume of water obtained by gravity drainage to the total volume of the materials drained, is called 'yield'

D. Sum of the percentage of specific yield and specific retention is 100

E. All the above.

 Answer Option E

41. Isopiastic lines are the contours

A. drawn to represent water table

B. drawn to represent piezometric heads

C. drawn to piezometric surface

D. none of these.

 Answer Option C

42. The coefficients of permeability of soils of an unconfined aquifer and another confined aquifer were determined by pumping water from the wells and observing the effect of water table in two test wells at equal distances was found to be equal. The total height of confined aquifer H is given by

A. H = h2 - h1

B. H = h1 - h2

C. H = h2 + h1

D. (h1 + h2)

 Answer Option D

43. The radius of influence is

A. radius of the main well

B. distance from the wall of main well to the point of zero draw down

C. distance from the centre of main well to the point of zero draw down

D. none of these.

 Answer Option C

44. When a constant discharge 2.91 litres/sec. was obtained in a pumping test, the draw downs in the test wells at 3 m and 6.184 m were 2.6 m and 0.3 m respectively. If over-all depth of the pumping well was 16 m, the permeability of the soil, is

A. 0.0005 cm/sec

B. 0.001 cm/sec

C. 0.002 cm/sec

D. 0.01 cm/sec.

 Answer Option B

45. If ω is unit weight of water, Q the discharge in cumecs, H the total head lift and η, the efficiency of the pump, the H.P. of the motor is

A.

B.

C.

D.

 Answer Option A

46. If h is the loss due to friction in a pipe. Total losses in strainer and bends may be taken as

A. 0.01 h

B. 0.45 h

C. 0.20 h

D. 0.25 h

E. 0.3 h.

 Answer Option D

47. If the loss due to friction in pipes is 4 m, the total losses in strainer and bends may be taken as

A. 0.10 m

B. 0.20 m

C. 0.5 m

D. 1.0 m.

 Answer Option D

48. The rate of evaporation from reservoirs may be determined by

A. pan-measurement method

B. empirical formulae

C. storage equation method

D. energy budget method

E. all the above.

 Answer Option E

49. In estimating the rate of evaporation from the reservoir surface, a pan 1.5 metres in diameter, was filled upto 8.0 cm. During a specified period of time, the rainfall recorded was 5 cm. 3 cm of water was removed from the pan to keep the depth of water. At the end of the time, the depth was 9 cm. If the pan coefficient is 0.6, the evaporation loss is

A. 2 mm

B. 4 mm

C. 6 mm

D. 6 mm.

 Answer Option C

50. Dicken's formula for high flood estimate, is useful only for the catchments in

A. Southern India

B. Northern India

C. Eastern India

D. Western India.

 Answer Option B