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Engineering :: Environmental Engineering

51.  Bleaching power is
A. Lime B. Stacked lime
C. Chloride of lime D. Hypo-chloride of lime
E. Hypo-chlorite of lime    
52.  The process used for the removal of dissolved carbondioxide from the water, is known as
A. Coagulation B. Agitation
C. Aeration D. Sedimentation
E. Zeolitc    
53.  Ultra-violet rays are used for the treatment of water known as
A. Dechlorination B. Disinfection
C. Aeration D. Filtration
E. Bleaching    
54.  The method used for the removal of fine suspended particle is
A. Filtration B. Agitation
C. Flotation D. Aeration
E. Screening    
55.  Turbidity in water may be removed by
A. Sedimentation B. Filtration
C. Agitation D. Aeration
E. Oxidation    
56.  The permissible level of HCN in drinking water is
A. Less than 0.01 mg/litre B. Around 1 mg/litre
C. Around 5 mg/litre D. Between 10 to 20 mg/litre
E. More than 50 mg/litre    
57.  The presence of fluorides in drinking water helps in
A. Purification of water B. Preventing decaying of teeth
C. Deodourisation of water D. Reduces fungi formation
E. Killing aerobic bacteria    
58.  The maximum concentration of lead in drinking water should not exceed.
A. 0.0005 mg/litre B. 0.005 mg/litre
C. 0.05 mg/litre D. 0.5 mg/litre
E. 5 mg/litre    
59.  Which of the following is pesticide?
A. Endrin B. Aldrin
C. Toxaphone D. DDT
E. All of the above    
60.  The maximum permissible level or pesticides, in general, in drinking water is nearly
A. 1 to 50 ppm B. 50 to 100 ppm
C. 100 to 250 ppm D. 250 to 500 ppm
E. 500 to 1000 ppm    

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