Consequence(s) of ozone hole is/are:

1. They cause death of many phytoplanktons.
2. Excess exposure may even cause mutation in plants. 
3. It leads to the ageing of skin, cataracts, skin cancer, and sunburns.
4. All of the above.

Subtopic:  Air Pollution - Ozone |
 95%
From NCERT
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The major pollutant(s) of water pollution is/are:

1. Pathogens.

2. Organic waste.

3. Chemical components.

4. All of the above.

Subtopic:  Water Pollution - Causes |
 89%
From NCERT
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Biochemical Oxygen Demand (BOD) is-

1. Amount of oxygen required by bacteria to decompose organic matter in a certain volume of a sample of water.
2. Amount of CO2 required by bacteria to decompose organic matter in a certain volume of a sample of water.
3. Amount of O3 required by bacteria to decompose organic matter in a certain volume of a sample of water.
4.  None of the above

Subtopic:  Water Pollution - Biological Oxygen Demand |
 92%
From NCERT
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The major source(s) of soil pollution is/are:

1. Industrial waste.

2. Fertilizers and pesticides.

3. Organic compost.

4. Both (1) are (2)

Subtopic:  Soil Pollution & Waste Management |
 87%
From NCERT
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The example(s) of pesticide is/are-

1. Aldrin

2. Sodium chlorate

3. Dieldrin

4. Both (1) and (3)

Subtopic:  Soil Pollution & Waste Management |
 90%
From NCERT
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The correct statement(s) regarding green chemistry is/are:

1. It helps in decreasing environmental pollution.
2. It prevents or limits chemical pollutants from being introduced into the environment.
3. It reduces the use and generation of substances hazardous to the environment.
4. All of the above.

Subtopic:  Green Chemistry |
 95%
From NCERT
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The best measure(s) to control water pollution is/are:

1. Compost should be preferred over chemical fertilizers.
2. The concentration of pollutants in the industrial plants should be checked regularly.
3. All industrial and chemical discharges should be made free from toxic metals before allowing them to enter a water body.
4. All of the above.

Subtopic:  Water Pollution - Causes |
 96%
From NCERT
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The reaction(s) involved in ozone layer depletion in the stratosphere is/are:

1.
2.
3.
4. All of the above


 

Subtopic:  Air Pollution - Ozone |
 93%
From NCERT
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The reaction/s involved during the formation of photochemical smog are:

\(1. \space NO_2(g) \rightarrow NO(g) + \stackrel{\cdot}{O(g)}\)

\(2. \stackrel{\cdot}{O(g)} + O_2(g) \rightarrow O_3(g)\)

\(3.\space O_3(g) + NO(g) \rightarrow NO_2(g) + O_2(g)\)

4. All of the above

Subtopic:  Air Pollution - Smog |
 89%
From NCERT
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The correct statement(s) regarding photochemical smog is/are:

1. It occurs in a dry, sunny climate.
2. It is oxidizing in nature.
3. It is composed of  PAN, acrolein, formaldehyde, nitrogen oxide, and ozone.
4. All of the above.

Subtopic:  Air Pollution - Smog |
 93%
From NCERT
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