Engineering :: Environmental Engineering

11.  In case of public supplies, the maximum permissible nitrite content is
A. 250 ppm B. 200 ppm
C. 100 ppm D. 50 ppm
E. zero ppm    

12.  The chloride content in the water for public supplies should not exceed
A. 250 mg/litre B. 100 mg/litre
C. 50 mg/litre D. 20 mg/litre
E. 1 mg/litre    

13.  The flouride content in the drinking water should not exceed
A. 200 mg/litre B. 150 mg/litre
C. 100 mg/litre50 mg/litre D. 50 mg/litre
E. 1 mg/litre    

14.  The total count of bacteria in portable water should not exceed
A. 10,000 per c.c. B. 5000 per c.c.
C. 998 per c.c. D. 10 per c.c.

15.  In one litre sample of drinking water the coliform organism should not exceed
A. 1000 B. 500
C. 100 D. 10
E. 1    

16.  Turbidity in water is due to
A. Algae B. Fungi
C. Organic salts D. Finely divided particles of clay, silt and organic matter
E. None of the above    

17.  The main disadvantage of hard water is
A. Higher density B. More turbidity
C. Foul smell D. Bad taste
E. Increased soap consumption    

18.  Plants that grow in absence of sublight in water, are called
A. Algae B. Shrubs
C. Fungi D. Any of the above
E. All of the above    

19.  The becteria that can survive without oxygen is called
A. Facultative bacteria B. Anerobic bacteria
C. Aerobic bacteria D. Furobic bacteria
E. All of the above    

20.  The presence of which of the following material in water is not considered to be dangerous?
A. Lead B. Copper
C. Mercury D. Calcium
E. Zinc    

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