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Depletion of which gas in the atmosphere can lead to an increased incidence of skin cancers?CorrectIncorrect
In which one of the following the BOD (Biochemical Oxygen Demand) of sewage (S), distillery effluent (DE), paper mill effluent (PE) and sugar mill effluent (SE) have been arranged in ascending order?CorrectIncorrect
Kyoto protocol was endorsed atCorrectIncorrect
Rachel Carson’s famous book “Silent Spring” is related toCorrectIncorrect
Which of the following are most suitable indicators of SO 2 pollution in the environment?CorrectIncorrect
Euro II norms stipulate that sulphur be controlled at _______ ppm in diesel and _______ ppm in petrol.CorrectIncorrect
Two lakes, A and B are identical in all aspects except that lake A has higher temperature. Which of the following is true ?CorrectIncorrect
The two gases making the highest relative contribution to the greenhouse gases areCorrectIncorrect
Which one of the following statements is not valid for aerosols?CorrectIncorrect
A lake near a village suffered heavy mortality of fishes within a few days. Consider the following reasons for this:
1.Lots of urea and phosphate fertilizer were used in the crops in the vicinity
2.The area was sprayed with DDT by an aircraft
3.The lake water turned green and stinky
4.Phytoplankton populations in the lake declined initially thereby greatly reducing photosynthesis.
Which two of the above were the main causes of fish mortality in the lake?CorrectIncorrect
Biomagnification refers to increase in concentration of the toxicant at successive trophic levels, this happens becauseCorrectIncorrect
Which of the following statements about Eutrophication are TRUE ?
(i)It can be naturally occurring process.
(ii)It is commonly found in standing rather than running water.
(iii)It can lead to oxygen depletion.
(iv)It is commonly assoicated with high levels of phosphates and nitrates.CorrectIncorrect
The polyblend isCorrectIncorrect
To improve the quality of environment (air, water and soil) the Govt. of India passed the ‘Environment (Protection) Act’ in yearCorrectIncorrect