A. 1.5
B. 1.8
C. 2.0
D. 2.7
A. maximum daily demand
B. maximum hourly demand
C. average daily demand
D. maximum hourly demand on maxi¬mum day
A. at a distance R from the well
B. close to the well
C. at a distance R/2 from the well
D. none of the above
where R is the radius of influence
A. air relief valve
B. reflux valve
C. pressure relief valve
D. sluice valve
A. more depth
B. less depth
C. more discharge
D. less discharge
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
A. carbon dioxide
B. oxygen
C. hydrogen
D. nitrogen
A. calcium carbonate
B. magnesium carbonate
C. sodium carbonate
D. calcium hydroxide
A. 0.1 mg/litre
B. 1.5 mg/litre
C. 5 mg/litre
D. 10 mg/litre