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Measuring BOD (biological oxygen demand) is primarily used for?

AEstimating the types of microbes

BDetermine the level of dissolved oxygen

CEstimating the quantity of organic matter in sewage water

DNone of the above

Answer:

C. Estimating the quantity of organic matter in sewage water


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The main sources of Arsenic in water are ________?
പുനർനിർമ്മിക്കാൻ കഴിയുന്ന ഊർജ്ജ സ്രോതസ്സ് :
Wold Environment Day is on
Coldest layer of Atmosphere is?

Which of the following statements are wrong ?

1.In India cyclones occur usually in April-May, and also between October and December.

2.The worst hitting cyclones have been in Andhra Pradesh cyclone of November 1977 and super cyclone Odisha in the year 1999.