1 >>The hourly variation factor is usually taken as ?
- (A) 1.5
- (B) 1.8
- (C) 2
- (D) 2.7
2 >>The population of a town in three consecutive years are 5000, 7000 and 8400 respectively. The population of the town in the fourth consecutive year according to geometrical increase method is ?
- (A) 9500
- (B) 9800
- (C) 10100
- (D) 10920
3 >>The suitable method of forecasting population for a young and rapidly increasing city is ?
- (A) arithmetical increase method
- (B) geometrical increase method
- (C) incremental increase method
- (D) graphical method
4 >>The devices which are installed for drawing water from the sources are called ?
- (A) aquifers
- (B) aquiclude
- (C) filters
- (D) intakes
5 >>The type of valve, which is provided on the suction pipe in a tubewell, is ?
- (A) air relief valve
- (B) reflux valve
- (C) pressure relief valve
- (D) sluice valve
6 >>The maximum discharge of a tubewell is about ?
- (A) 5 litres/sec
- (B) 50 litres/sec
- (C) 500 litres/sec
- (D) 1000 litres/see
7 >>As compared to shallowwells, deep wells have ?
- (A) more depth
- (B) less depth
- (C) more discharge
- (D) less discharge
8 >>The polluted water is one which ?
- (A) contains pathogenic bacteria
- (B) consists of undesirable substances rendering it unfit for drinking and domestic use
- (C) is safe and suitable for drinking and domestic use
- (D) is contaminated
9 >>Ground water is usually free from ?
- (A) suspended impurities
- (B) dissolved impurities
- (C) both suspended and dissolved impuri�ties
- (D) none of the above
10 >>An egg shaped section of sewer ?
- (A) is economical than circular section
- (B) provides self cleansing velocity at low discharges
- (C) is more stable than circular section
- (D) is easy to construct
11 >>Which of the following is not a water borne disease ? ?
- (A) dysentery
- (B) cholera
- (C) typhoid
- (D) malaria
12 >>The most common cause of acidity in water is ?
- (A) carbon dioxide
- (B) oxygen
- (C) hydrogen
- (D) nitrogen
13 >>The phenolic compounds in public water supply should not be more than ?
- (A) 0.1 ppm
- (B) 0.01 ppm
- (C) 0.001 ppm
- (D) 0.0001 ppm
14 >>Standard EDTA (ethylene diamine tetra acetic acid) solution is used to determine the ?
- (A) hardness in water
- (B) turbidity in water
- (C) dissolved oxygen in water
- (D) residual chlorine in water
15 >>Alkalinity in water is expressed as milligrams per litre in terms of equivalent ?
- (A) calcium carbonate
- (B) magnesium carbonate
- (C) sodium carbonate
- (D) calcium hydroxide
16 >>Which of the following values of pH represents a stronger acid? ?
- (A) 2
- (B) 5
- (C) 7
- (D) 10
17 >>Turbidity is measured on ?
- (A) standard silica scale
- (B) standard cobalt scale
- (C) standard platinum scale
- (D) platinum cobalt scale
18 >>On standard silica scale, the turbidity in drinking water should be limited to ?
- (A) 10 ppm
- (B) 20 ppm
- (C) 30 ppm
- (D) 50 ppm
19 >>Residual chlorine in water is determined by ?
- (A) starch iodide method
- (B) orthotolidine method
- (C) both (a) and (b)
- (D) none of the above
20 >>Orthotolidine test is used for determination of ?
- (A) dissolved oxygen
- (B) residual chlorine
- (C) biochemical oxygen demand
- (D) dose of coagulant
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