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?
 
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?
 
6.
In 2002 AD, according to research, the concentration of reached to
7.
Photochemical smog formed in congested metropolitan cities mainly consist of
8.
If there is no greenhouse effect, the average temperature at the surface of earth would have been
9.
A disease caused by eating fish contaminated by industrial waste containing mercury compounds is known as
10.
The cause of decline in the population of reptiles and birds is