Water is pumped from a well tapping an unconfined aquifer at a certain discharge rate and the steady state drawdown (X) in an observation well is monitored. Subsequently, the pumping discharge is doubled and the steady state drawdown in the same observation well is found to be more than double (i.e., more than 2X). This disproportionate drawdown is caused by

1.  well losses

2.  decrease in the saturated thickness of the aquifer

3.  nonlinear flow

4.  delayed gravity yield

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4
Correct Answer :

nonlinear flow


Explanation :
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The total irrigation depth of water, required by a certain crop in its entire growing period (150 days), is 25.92cm. The culturable command area for a distributary channel is 100,000 hectares. The distributary channel shall be designed for a discharge.

1.  less than 2 cumecs

2.  2 cumecs

3.  20 cumecs

4.  more than 20 cumecs

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4
Correct Answer :

2 cumecs


Explanation :
No Explanation available for this question

The moisture content of soil in the root zone of an agricultural crop at certain stage is found to be 0.05. The field capacity of the soil is 0.15. The root zone depth is 1.1m. The consumptive use of crop at this stage is 2.5 mm/day and there is no precipitation during this period. Irrigation efficiency is 65%. It is intended to raise the moisture content to the field capacity in 8 days through irrigation. The necessary depth of irrigation is

1.  115 mm

2.  169 mm

3.  200 mm

4.  285 mm

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4
Correct Answer :

200 mm


Explanation :
No Explanation available for this question

The results of analysis of a raw water sample are given below Turbidity 5 mg/1 pH 7.4 Fluorides 2.5 mg/1 Total Hardness 300 mg/1 Iron 3.0 mg/1 MPN 50 per 100 ml From the data given above, it can be inferred that water needs removal of

1.  Turbidity followed by disinfection

2.  Fluorides and Hardness

3.  Iron, followed by disinfection

4.  Both (b) and (c)

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4
Correct Answer :

Both (b) and (c)


Explanation :
No Explanation available for this question

Which of the following sewage treatment methods has inherent problem of odour, ponding, and fly nuisance

1.  UASB system

2.  Activated sludge process

3.  Trickling filters

4.  Stabilization ponds

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4
Correct Answer :

Trickling filters


Explanation :
No Explanation available for this question

From amongst the following sewage treatment options, largest land requirements for a given discharge will be needed for

1.  trickling filter

2.   anaerobic pond

3.   oxidation ditch

4.  oxidation pond

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4
Correct Answer :

oxidation pond


Explanation :
No Explanation available for this question

Zero hardness of water is achieved by

1.  lime soda process

2.  excess lime treatment

3.   iron exchange treatment

4.  excess alum and lime treatment

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4
Correct Answer :

iron exchange treatment


Explanation :
No Explanation available for this question

The speed and delay studies on a defined section of highway are conducted by

1.  radar gun

2.  traffic counters

3.  moving car method

4.  enoscope

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4
Correct Answer :

moving car method


Explanation :
No Explanation available for this question

If L defines the Laplace Transform of a function, L [sin (at)] will be equal to

1.  a/(s2-a2)

2.  a/(s2+a2)

3.  s/(s2+a2)

4.   s/(s2-a2)

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4
Correct Answer :

a/(s2+a2)


Explanation :
No Explanation available for this question

The Fourier series expansion of a symmetric and even function, ƒ(x) where ƒ(x) = 1+ (2x/π), – π < x < 0 and = 1-(2x/ π), 0 < x < π will be

1.  

2.  

3.  

4.  

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4
Correct Answer :


Explanation :
No Explanation available for this question
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