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Engineering :: Environmental Engineering


21.  Lead poisoning occurs when the lead content in water is
A. 300 - 500 ppm B. 30 - 50 ppm
C. 10 - 15 ppm D. 3 - 5 ppm
E. 0.3 - 0.5 ppm    

22.  Water with least contamination can be be obtained from
A. Rivers B. Lakes
C. Wells D. Reservoirs
E. Spring along the hill slope    

23.  A hard water may contain
A. Calcium carbonate B. Magnesium sulphate
C. Magnesium bicarbonate D. Any of the above
E. None of the above    

24.  Per capita consumption of water is usually taken as
A. 50 - 100 litres B. 150 - 300 litres
C. 400 - 500 litres D. 500 - 750 litres
E. 750 - 1000 litres    

25.  Which of the following industry will usually have the highest concumption of water for processing?
A. Foundry B. Steel plant
C. Automobile industry D. Paper mill
E. Aluminium industry    

26.  The process of removal of permanent hardness of water is
A. Zeolite process B. Sedimentation process
C. Filtration process D. Boiling process
E. Lime process    

27.  The odour of water is expressed in terms of threshold number. The maximum threshold number permitted for public supplies is
A. 10 B. 5
C. 3 D. 2
E. 1    

28.  For the maximum alkalinity of water, the pH value would be
A. Zero B. 7
C. 8 D. 14
E. 20    

29.  For the maximum acidity of water, pH value would be
A. 0.01 B. 0.1
C. 1 D. 10
E. 11    

30.  If with minimum quantity of potassium permanganate, the pink colour of water disappears soon, then it shows that
A. Water is hard B. Water is acidic
C. Water is alkaline D. Organic matter is present in water
E. Chlorine content is high in water    




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