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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 |
Answer: Option D
Explanation:
|
72. |
COD stands for: |
A. |
Caesium oxide deposition |
B. |
Control of diesel |
C. |
Chemistry of depositions |
D. |
Chemical oxygen demand |
Answer: Option D
Explanation:
|
73. |
The Escherichia cells in a human excreta number in: |
A. |
Thousands |
B. |
Hundreds |
C. |
Billion |
D. |
Millions |
Answer: Option C
Explanation:
|
74. |
Prolonged liberal irrigation of agricultural fields is likely to create the problem of: |
A. |
Acidity |
B. |
Metal toxicity |
C. |
Aridity |
D. |
Salinity |
Answer: Option D
Explanation:
|
75. |
Pollution is: |
A. |
Always an unfavourble alteration |
B. |
Always a favourable change |
C. |
Rarely a favoruable alteration |
D. |
Usually an unfavourable change |
Answer: Option A
Explanation:
|
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 |
Answer: Option A
Explanation:
|
77. |
The percentage of water found in oceans is: |
Answer: Option C
Explanation:
|
78. |
Greenhouse effect refers to: |
A. |
Production of cereals |
B. |
Trapping of UV rays |
C. |
Cooling of earth |
D. |
Warming of earth |
Answer: Option D
Explanation:
|
79. |
PAN stands for: |
A. |
Peroxy acetyl nitrate |
B. |
Peroxy acyl nitrite |
C. |
Pyridine aceto-nitrite |
D. |
Peroxy aceto-nitrile |
Answer: Option A
Explanation:
|
80. |
The sea water gets pollution mainly due to: |
A. |
Industrial waste |
B. |
Oil spills |
C. |
Death of marine fauna |
D. |
None of these |
Answer: Option B
Explanation:
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