In which of the following layer of atmosphere there is more thickness of ozone layer ?

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Which of the following is a macro nutrient ?

A. boron B. iron C. copper D. carbon...

Newspaper can be recycled again and again how many times ?

A. 2 B. 3 C. 4 D. 5...

The main pollutant of leather tanneries in the waste water is____________________?

A. chromium III B. chromium IV C. chromium V D. chromium VI...

The yellow colour in photochemical smog is due to presence of__________________?

A. dinitrogen oxide B. nitrogen dioxide C. chlorine gas D. chlorine dioxide...

Which of the following is not primary pollutant__________________?

A. SO3 B. CO C. NO D. H2SO4...