MCQ Effects of Pollution, Class 11 Chemistry

1. There will be total 10  MCQ in this test.
2. Please keep a pen and paper ready for rough work but keep your books away.
3. The test will consist of only objective type multiple choice questions requiring students to mouse-click their correct choice of the options against the related question number.
4. No negative marking for incorrect choice.
5. Please click on “Finish the Test” when you want to exit.
6. All the best – Happy Studying.

1. Ozone in the stratosphere is a product of UV radiations acting on:

CFCs

Chlorine atoms

Dioxygen molecule

Free oxygen atoms

Your comments:

Question 1 of 10

2. The main reason of ozone layer depletion is the release of:

Smoke and fog

fire

Chlorofluorocarbons

water

Your comments:

Question 2 of 10

3. Human excreta contains bacteria which causes gastrointestinal diseases are:

Staphylococcus

Lactic acid bacillus

Escherichia coli

Listeria

Your comments:

Question 3 of 10

4. Earth is protected from UV radiation by a layer of:

Oxygen

Ozone

Carbon dioxide

Nitrogen

Your comments:

Question 4 of 10

5. Clean water and highly polluted water have BOD:

7ppm and 6ppm respectively

5ppm and 17ppm respectively

6ppm and 12ppm respectively

7ppm and 5ppm respectively

Your comments:

Question 5 of 10

6. The amount of oxygen required by bacteria to break down the organic matter present in a certain volume of a sample of water is called:

Sulphur

Ammonia

BOD

Iron

Your comments:

Question 6 of 10

7. A synthetic toxic chemical with ecological repercussions is:

Protium

Tritium

SO₂ and NO₂

Pesticides

Your comments:

Question 7 of 10

8. Oxidation of ethene in the presence of ionic catalyst in aqueous medium produces:

Ethanal

Methanal

Hydrogen peroxide

Ethyne

Your comments:

Question 8 of 10

9. Industrial solid wastes are sorted out as:

Classified and non-classified wastes

Proportion ans improportion wastes

Chemical and non-chemical wastes

Biodegradable and non-degradable wastes

Your comments:

Question 9 of 10

10. In winter polar Stratospheric clouds provide surface on which chlorine nitrate formed get hydrolysed to form:

Molecular chlorine

Nitrate free radical

Chlorine free radical

Hypochlorous acid

Your comments:

Question 10 of 10

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