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CSS :: Pollution


71.  In the polluted water, the values of:
A. BOD much higher than COD B. BOD slightly higher than COD
C. COD slightly higher than BOD D. COD much higher than BOD

72.  COD stands for:
A. Caesium oxide deposition B. Control of diesel
C. Chemistry of depositions D. Chemical oxygen demand

73.  The Escherichia cells in a human excreta number in:
A. Thousands B. Hundreds
C. Billion D. Millions

74.  Prolonged liberal irrigation of agricultural fields is likely to create the problem of:
A. Acidity B. Metal toxicity
C. Aridity D. Salinity

75.  Pollution is:
A. Always an unfavourble alteration B. Always a favourable change
C. Rarely a favoruable alteration D. Usually an unfavourable change

76.  Which of the following is generally used for induced mutagenesis in crop plants?
A. Gamma rays (from cobalt 60) B. X-rays
C. UV (260 nm) D. Alpha particles

77.  The percentage of water found in oceans is:
A. 89% B. 93%
C. 97% D. 86%

78.  Greenhouse effect refers to:
A. Production of cereals B. Trapping of UV rays
C. Cooling of earth D. Warming of earth

79.  PAN stands for:
A. Peroxy acetyl nitrate B. Peroxy acyl nitrite
C. Pyridine aceto-nitrite D. Peroxy aceto-nitrile

80.  The sea water gets pollution mainly due to:
A. Industrial waste B. Oil spills
C. Death of marine fauna D. None of these




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