Online Civil Engineering Test - Water Resources Engineering Test

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Total number of questions: 20.
Time allotted: 30 minutes.
Each question carries 1 mark; there are no negative marks.
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Pick up the correct statement from the following :

The portion of pellicular water which remains unutilised, is called hygroscopic water

The moisture content at which permanent wilting of plants takes place, is called the wilting point

The path of the water required to bring the soil moisture content of a soil up to its field capacity is called soil moisture deficiency

The moisture deficiency will be different at different points

All the above.

[#]

According to Robert E. Horton, the equation of infiltration capacity curve, is (where letters carry their usual meanings)

f = f_c (f_o - f_c) e^kt

f = f_t - (f_o - f_c) e^-kt

f = f_t + (f_o - f_c) e^-kt

f = f + (f_o - f_c) e_kt

[#]

Precipitation caused by lifting of an air mass due to the pressure difference, is called

cyclonic precipitation

convective precipitation

orographic precipitation

none of these.

[#]

A recording type rain gauge

produces a mass curve of rain fall

records the cumulative rain

is sometimes called integrating rain gauge or continuous rain gauge

all the above.

[#]

For determination of average annual precipitation in a catchment basin, the best method is

Arithmetical method

Thiessen's mean method

Isohyetal method

None of these.

[#]

While calculating the average depth of annual precipitation in a catchment basin, importance to individual raingauge station is given in

Arithmetical method

Thiessen's mean method

Isohyetal method

both (a) and (b)

both (b) and (c).

[#]

If y is the depth of water at any section, then the mean velocity is

0.1 y

0.2 y

0.3 y

0.5 y

0.6 y.

[#]

With the usual meanings ofletters, the equation

is used for determining the velocity of ground water flow in metres per day. It is known as

Meinzer's formula

Slichter's formula

Darcy's formula

Hazen's formula.

[#]

In the derivation of Thiem's formula

, the following assumption is not applicable

The aquifer is homogeneous and isotropic

Flow lines are radial and horizontal

The slope of the water surface is too small

The well has been sunk up to the surface of the unconfined aquifer

None of these.

[#]

10.

Consumptive use of a crop during growth, is the amount of

interception

transpiration

evaporation

all the above.

[#]

11.

The best instrument for measuring the velocity of a stream flow is

pitot tube

Price's current meter

surface float

sub-surface float.

[#]

12.

The average mean velocity of a stream having depth h, may be obtained by taking the average of the readings of a current meter at a depth of

0.1 h and 0.9 h

0.2 h and 0.8 h

0.3 h and 0.7 h

0.4 h and 0.6 h.

[#]

13.

The best unit period of a unit hydrograph, is equal to basin lag divided by

[#]

14.

While determining the yield of a gravity well by pumping, the depth of water table in two tests wells at distances r₁ and r₂ from the centre of the main well were found to be s₁ and s₂ respectively. Assuming the coefficient of transmissibility of the soil as T, the discharge Q may be given by

[#]

15.

For high flood estimates the average value of the constant C in Dicken's formula Q = CA^3/4, is

6.5

8.5

9.5

10.5

11.5

[#]

16.

Pick up the correct statement from the following :

Higher the gauge, more deficient will be the rain catch

Heavier the rain, lesser will be the rain catch

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

Coniferrous forest is idealy suited for installing the gauge

All the above.

[#]

17.

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

75 mm

77 mm

79 mm

81 mm.

[#]

18.

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

205 sq. km.

215 sq. km.

225 sq. km.

235 sq. km.

245 sq. km.

[#]

19.

Pick up the correct statement from the following :

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

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

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

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

All the above.

[#]

20.

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

0.10 m

0.20 m

0.5 m

1.0 m.

[#]

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