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Engineering :: Environmental Engineering


1.  Disinfection of drinking water means removal of
A. Turbidity B. Colour
C. Odour D. Oxygen
E. Bacteria    

2.  Disinfection of water is done by
A. Filtration B. Alum
C. Ozone D. Heating and cooling
E. Passing chlorine    

3.  The aeration of water is done for the removal of
A. Colour B. Turbidity
C. Bacteria D. Odour
E. Hardness    

4.  For controlling the growth of algae, the chemical generally used is
A. Alum B. Lime
C. Bleaching powder D. Copper sulphate
E. Ozone    

5.  For removal of temporary hardness of water
A. Water is filtered B. Water is boiled
C. Alum is added to water D. Lime is added to water
E. Chlorine is passed through water    

6.  The presence of algae in water indicates that the water is
A. Hard B. Soft
C. Acidic D. Pune
E. Free from turbidity    

7.  For portable water the permissible pH value is
A. 1 - 4.5 B. 4.5 - 7
C. 7 - 8.5 D. 9 -- 11
E. 11 -- 14    

8.  The desirable temperature of portable water is
A. zero degree centigrade B. 10?C
C. 20?C D. 27?C
E. 37?C    

9.  The hardness limit for portable water ranges between
A. 10 - 50 ppm B. 50 - 65 ppm
C. 75 - 117 ppm D. 150 - 250 ppm
E. 300 - 700 ppm    

10.  The maximum permissible turbidity for drinking water
A. Zero B. 1 - 4 ppm
C. 15 - 25 ppm D. 3 - 50 ppm
E. 30 - 50 ppm    




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