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Olympiad Test: Pollution of Air & Water


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20 Questions MCQ Test Science Class 8 | Olympiad Test: Pollution of Air & Water

Olympiad Test: Pollution of Air & Water for Class 8 2022 is part of Science Class 8 preparation. The Olympiad Test: Pollution of Air & Water questions and answers have been prepared according to the Class 8 exam syllabus.The Olympiad Test: Pollution of Air & Water MCQs are made for Class 8 2022 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Olympiad Test: Pollution of Air & Water below.
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Olympiad Test: Pollution of Air & Water - Question 1

Which of the following air pollutants is wrongly matched with the effect it causes?

Detailed Solution for Olympiad Test: Pollution of Air & Water - Question 1

Which of the following air pollutants is wrongly matched with the effect it causes?

A) Dust - reduces photosynthesis in green plants.

B) Carbon monoxide - reduces oxygen in the blood.

C) Chlorofluorocarbons - lead to the depletion of ozone layer.

D) Nicotine - hardens and narrows blood vessels

Olympiad Test: Pollution of Air & Water - Question 2

Which of the following does NOT cause air pollution?

Detailed Solution for Olympiad Test: Pollution of Air & Water - Question 2

Air pollution is not caused by increasing forest reserves.

Olympiad Test: Pollution of Air & Water - Question 3

Which of the following is NOT a general pollutant of atmosphere?

Detailed Solution for Olympiad Test: Pollution of Air & Water - Question 3

Carbon dioxide is normally not an atmospheric pollutant. It is required by green plants to carry on photosynthesis. Green plants, use carbon dioxide to synthesize carbohydrates. However, excessive release of carbon dioxide by automobiles, industries and other anthropogenic activities leads to atmospheric pollution. This is because carbon dioxide is a green house gas and is a major gas contributing in global warming.

Olympiad Test: Pollution of Air & Water - Question 4

Identify the gas associated with greenhouse effect.

Detailed Solution for Olympiad Test: Pollution of Air & Water - Question 4

Carbon dioxide causes global warming, which is the same as greenhouse effect. Hence, the gas is called greenhouse gas

Olympiad Test: Pollution of Air & Water - Question 5

What is the outcome of the release of carbon particles and smoke from factories?

Detailed Solution for Olympiad Test: Pollution of Air & Water - Question 5

The release of carbon particles and smoke from factories decreases the rate of photosynthesis in plants.

Olympiad Test: Pollution of Air & Water - Question 6

A Which of the following gases can result in the formation of acid rain?

Detailed Solution for Olympiad Test: Pollution of Air & Water - Question 6

Oxides of sulphur i.e., sulphur dioxide and sulphur trioxide gases present in air combine with moisture and form acids, which come down along with rain water. This is called acid rain. 

Olympiad Test: Pollution of Air & Water - Question 7

Heat is reflected from the earth's surface and trapped in the atmosphere. Which phenomena is being referred to?

Detailed Solution for Olympiad Test: Pollution of Air & Water - Question 7

Heat reflected from the earth's surface is trapped in the atmosphere. This is referred to as the greenhouse effect. 

Olympiad Test: Pollution of Air & Water - Question 8

Which of the water pollutants is INCORRECTLY paired with the source?

Detailed Solution for Olympiad Test: Pollution of Air & Water - Question 8

Sewage comes from the houses not from factories. Poisonous chemicals come from factories. 

Olympiad Test: Pollution of Air & Water - Question 9

Which of the following gases is regarded as an atmospheric pollutant?

Detailed Solution for Olympiad Test: Pollution of Air & Water - Question 9

SO2 is regarded as an air pollutant.

Olympiad Test: Pollution of Air & Water - Question 10

What is the effect of sulphur dioxide present in air on human beings?

Detailed Solution for Olympiad Test: Pollution of Air & Water - Question 10

Sulphur dioxide in air affects the skin and the lungs of human beings

Olympiad Test: Pollution of Air & Water - Question 11

How are lead particles released into the air?

Detailed Solution for Olympiad Test: Pollution of Air & Water - Question 11

Burning of leaded petrol in automobiles releases lead particles into the air and causes pollution.

Olympiad Test: Pollution of Air & Water - Question 12

From which of the following bad effects does the ozone layer in our atmosphere protect us?

Detailed Solution for Olympiad Test: Pollution of Air & Water - Question 12

Ozone layer present in the atmosphere protects us from UV rays by preventing them from reaching the earth.

Olympiad Test: Pollution of Air & Water - Question 13

How are monuments of marble destroyed?

Detailed Solution for Olympiad Test: Pollution of Air & Water - Question 13

Monuments of marble can be destroyed by acid rain because acid corrodes calcium carbonate (marble). The pollutants in air that cause acid rain are oxides of sulphur and nitrogen.

Olympiad Test: Pollution of Air & Water - Question 14

Which of the major sources of air pollution contributes pollutants like chlorofluorohydrocarbons?

Detailed Solution for Olympiad Test: Pollution of Air & Water - Question 14

Aerosols are the sources of major pollutants like CFC?s. 

Olympiad Test: Pollution of Air & Water - Question 15

Which of these is the major air pollutant in cities like Delhi and Kolkata?

Detailed Solution for Olympiad Test: Pollution of Air & Water - Question 15

A major air pollutant in cities like Delhi and Kolkata is suspended particulate matter.

Olympiad Test: Pollution of Air & Water - Question 16

Which of the following applications use catalytic converters?

Detailed Solution for Olympiad Test: Pollution of Air & Water - Question 16

Automobiles use catalytic converters like platinum. These acts as catalysts to convert CO to CO2.

Olympiad Test: Pollution of Air & Water - Question 17

What is smog?

Detailed Solution for Olympiad Test: Pollution of Air & Water - Question 17

A combination of smoke and fog is smog.

Olympiad Test: Pollution of Air & Water - Question 18

If there is no CO2 in the atmosphere, what would happen to the earth's temperature?

Detailed Solution for Olympiad Test: Pollution of Air & Water - Question 18

CO2 traps heat and does not allow it to escape into space. Hence, if there is no CO2 in the atmosphere, the earth's Temperature would be less than the present.   

Olympiad Test: Pollution of Air & Water - Question 19

Which of the following is NOT a feature of potable water?

Detailed Solution for Olympiad Test: Pollution of Air & Water - Question 19

Potable water should be free from sodium, calcium and magnesium. Potable water should be clean, colourless and odourless, free from bacteria and must contain dissolved oxygen and carbon dioxide.

Olympiad Test: Pollution of Air & Water - Question 20

Which of the following pollutants is NOT present in the vehicular exhaust emissions?

Detailed Solution for Olympiad Test: Pollution of Air & Water - Question 20

Ammonia is not present in vehicular exhaust emissions. 

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