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.Management Sciences
Category: Environmental Chemistry
The percentage of suspended solid waste in raw water is removed by coagulation is__________________?
0
A. 60
B. 70
C. 80
D. 90
The yellow colour in photochemical smog is due to presence of__________________?
A. dinitrogen oxide
B. nitrogen dioxide
C. chlorine gas
D. chlorine dioxide
Three elements needed for the healthy growth of plants are_________________?
A. N P K
B. N K C
C. N S P
D. N Ca P
Which of the following is not a secondary pollutant_________________?
A. ozone
B. carbonic acid
C. sulphuric acid
D. carbon dioxide
Chlorination of water may be harmful if the water contains_________________?
A. Ammonia
B. Dissolved oxygen
C. Carbon dixide
D. All
Residence time of methane in the atmosphere is___________________?
A. 3 – 7 days
B. 2 -3 days
C. 3 – 7 years
D. 2 – 3 years
Ozone hole is substantial depletion of ozone in every year during__________________?
A. Aug – Nov
B. Sep – Nov
C. Nov – Dec
D. Dec – Jan
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