20 Nos. of Environment Engineering – water supply MCQ are given below:

##### Q1. The specific retention is least in

(a) coarse gravel

(b) sand

(c) clay

(d) silt

Ans: (a) coarse gravel

##### Q2. To determine the velocity of flow of ground water, the most commonly used non-empirical formula is

(a) Darcy’s formula

(b) Slichter’s formula

(c) Hazen’s formula

(d) Lacy’s formula

Ans: (a) Darcy’s formula

##### Q3. The location of a well is considered to be good, if it is suck into

(a) coarse gravel

(b) silt

(c) sand

(d) clay

Ans: (a) coarse gravel

##### Q4.  Water to the consumers may be supplied from

(a) rainy wells sunk to the water level

(b) infiltration well dug out on the banks of rivers

(c) infiltration galleries connected to sump well

(d) All of the above.

Ans: (a) rainy wells sunk to the water level

##### Q5. The most widely used tube well in India, is

(a) strainer well

(b) cavity well

(d) perforated well

(c) slotted well

Ans: (a) strainer well

##### Q6. For insignificant effect on the water table as a thumb rule, the tube wells should be spaced as one in every

(a) 0.5 sq km

(b) 1.0 sq km

(c) 1.5 sq km

(d) 2.0 sq km

Ans: (c) 1.5 sq km

##### Q7. “Shrouding” is provided

(a) Slotted type wells

(b) strainer wells

(c) cavity wells

(d) all the above

Ans: (a) Slotted type wells

##### Q8. Generally the maximum discharge from dugwell ranges

(a) 10 cu. m/hour

(b) 15 cu. m/hour

(c) 20 cu. m/hour

(d) 50 cu. m/hour

Ans: (c) 20 cu. m/hour

##### Q9. The maximum yield from a tube well is generally about

(a) 50 litres/sec

(b) 30 litres/sec

(c) 20 litres/sec

(d) 10 litres/sec

Ans: (a) 50 litres/sec

##### Q10. The suitable method for boring in hard rock, hard soil and boulder region is

(a) Percussion method

(b) rotary method

(c) core drilling

(d) jetting method

Ans: (a) Percussion method

##### Q11. Strainer type tube wells are considered unsuitable for

(a) coarse gravel

(b) fine sand strata

(c) clean gravel

(d) all the above

Ans: (b) fine sand strata

##### Q12. Per capita water demand is calculated in litres

(a) per person per day

(b) per person per month

(c) per person per year

(d) none of the above

Ans: (a) per person per day

##### Q13. Water demand of a city includes

(a) domestic water demand

(b) commercial and industrial demand

(c) fire and public-use demand

(d) all the above

Ans: (d) all the above

(a) 105

(b) 135

(c) 180

(d) 215

Ans: (b) 135

(a) 20%

(b) 30%

(c) 60%

(d) 75%

Ans: (c) 60%

##### Q16. Industrial and commercial water demand in a city as compared to total demand of the city is

(a) 10 to 15%

(b) 15 to 20%

(c) 20 to 25%

(d) 30 to 40%

Ans: (c) 20 to 25%

##### Q17. As per norms, 45 litres of water per person per day is provided in case of

(a) hotels

(b) hospitals

(c) office buildings

(d) public places

Ans: (c) office buildings

##### Q18. In a city having population approximately as 8 lakhs, the per capita demand of water will be

(a) 200 to 250 litres

(b) 180 to 200 litres

(c) 160 to 180 litres

(d) 100 to 120 litres

Ans: (b) 180 to 200 litres

##### Q19. Per capita consumption will be higher if

(a) pressure in distribution system will be more

(b) quality of water will be good

(c) the living standard of people is higher

(d) all the above are correct

Ans: (d) all the above are correct

##### Q20. Per capita consumption is highest in

(a) schools

(b) hospitals

(c) offices

(d) factories

Ans: (b) hospitals

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