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1.
Desertification has become a major problem due to
2.
Why CNG is considered as good fuel over diesel/petrol?
I. CNG burns most efficiently without leaving any unburnt remnant behind
II. CNG is cheaper than petrol or diesel
III. CNG cannot be siphoned off by thieves and adulterated like petrol or diesel
Which of the statements given above are correct?
I. CNG burns most efficiently without leaving any unburnt remnant behind
II. CNG is cheaper than petrol or diesel
III. CNG cannot be siphoned off by thieves and adulterated like petrol or diesel
Which of the statements given above are correct?
3.
Eutrophicated lake has BOD
4.
A sewage treatment process, in which a portion of the decomposer bacteria present in the waste is recycled into the beginning of the process, is called
5.
Consider the following statements about harmful effects of radioactive pollution
I. Radiations from nuclear wastes causes mutation at a very high rate
II. At high doses, nuclear radiations are lethal
III. At low doses, radiations cause disorders and cancer
Which of the statements given above are correct?
I. Radiations from nuclear wastes causes mutation at a very high rate
II. At high doses, nuclear radiations are lethal
III. At low doses, radiations cause disorders and cancer
Which of the statements given above are correct?