Use app×
Join Bloom Tuition
One on One Online Tuition
JEE MAIN 2025 Foundation Course
NEET 2025 Foundation Course
CLASS 12 FOUNDATION COURSE
CLASS 10 FOUNDATION COURSE
CLASS 9 FOUNDATION COURSE
CLASS 8 FOUNDATION COURSE
0 votes
1.3k views
in Biology by (10.7k points)
closed by

Class 8 Science MCQ Questions of Pollution of Air and Water with Answers

2 Answers

+1 vote
by (14.5k points)
selected by
 
Best answer

Students can resolve Class 8 Science MCQ Questions of Pollution of Air and Water with Answers sooner than the assessment to understand their preparation level. We coordinated those MCQ Questions on the thought the present exams Pattern and syllabus. Important MCQ Questions for class 8 Science with Answers had been coordinated through the method of expert educators from the present adaptation of NCERT books. 

Solve Class 8 Science MCQ Questions of Pollution of Air and Water with Answers to secure and update the section and to accomplish top with inside the assessment. At Sarthaks eConnect, you might get Multiple Choice Questions for Class 8 Science of all Chapters with definite Answers. 

Solving the Pollution of Air and Water MCQ Questions of Class 8 Science. MCQ Questions can be of outrageous assistance as you will know about every one of the ideas. Start your training now and score high in exams Class 8 Science MCQ Questions of Pollution of Air and Water with answers.

Practice Class 8 Science MCQ Questions chapter-wise

1. Which gas is the major pollutant of air?

(a) Carbon monoxide
(b) Nitrogen
(c) Oxygen
(d) Propane

2. The increase in the concentration of which gas is not responsible for Global Warming?

(a) Sulphur dioxide
(b) Nitrogen
(c) Carbon dioxide
(d) Methane

3. In which year Ganga Action Plan was launched?

(a) 1980
(b) 1984
(c) 1982
(d) 1985

4. Name the radiation which are absorbed by the green house gases.

(a) Ultrared radiations
(b) Infrared radiations
(c) Ultraviolet radiations
(d) None of these

5. Which element is present in the exhaust of automobiles?

(a) Lead
(b) Calcium
(c) Chromium
(d) Magnesium

6. The phenomenon of marble cancer is due to

(a) soil particles
(b) fog
(c) CFCs
(d) acid rain

7. The solid or liquid particles dispersed in the air are called

(a) oxides
(b) acids
(c) hydrocarbons
(d) aerosols

8. The type of pollution which is likely to affect Taj Mahal in Agra to a greater extent is

(a) air pollution
(b) soil pollution
(c) water pollution
(d) noise pollution

9. Bhopal tragedy was caused due to

(a) air pollution
(b) emission of poisonous gas
(c) water pollution
(d) leakage of poisonous gas

10. Water containing high salt concentration can be purified by

(a) boiling
(b) UV irradiation
(c) filtration
(d) reverse osmosis

11. Which of the following is a non-biodegradable pollutant?

(a) Sulphur dioxide
(b) DDT
(c) Nitrogen oxide
(d) Hydrogen oxide

12. Which of the following is major source of water pollution?

(a) Industrial waste
(b) Untreated sewage
(c) Agricultural waste
(d) All of the above

13. Which of the following techniques of irrigation should be used to save water?

(a) Water wheel
(b) Canal irrigation
(c) Drip irrigation
(d) Lift irrigation

14. Carbon monoxide in vehicle exhaust causes

(a) Increased oxygen carrying capacity of RBCs
(b) Reduced Nitrogen carrying capacity of RBCs
(c) Reduced oxygen carrying capacity of RBCs
(d) Reduced carbon carrying capacity of RBCs.

15. Smog =

(a) Smoke in dog’s stomach
(b) Smoke + fog
(c) Smoke dog
(d) frog in fog

16. The gas used in refrigerating appliances causing serious damage to ozone is

(a) MFCs
(b) CFCs
(c) LPCs
(d) DPCs

17. Greenhouse effect is

(a) Painting house green in colour
(b) Wearing green colour dress
(c) Having green room in the house
(d) Sun’s heat is trapped and not allowed to escape

18. ............... is a commonly used chemical method for purifying water.

(a) Brominization
(b) Flourination
(c) Filtration
(d) Chlorination

19. Ganga Action Plan is associated with

(a) Increase of fish culture in the Ganges
(b) Reduce Ganga water pollution
(c) Construct more bridges over the Ganges
(d) Increase water transport on the Ganges

20. Van Mahotsav is

(a) Planting trees in January
(b) Cutting trees in January
(c) Cutting trees in July
(d) Planting trees in July

21. Which of the following is not a source of air pollution?

(a) automobile exhaust
(b) burning of firewood
(c) windmill
(d) power plant

22. Which of the following is not a way to conserve water?

(a) replace
(b) reduce
(c) reuse
(d) recycle

23. The percentage of nitrogen is

(a) 21%
(b) 78%
(c) 12%
(d) 87%

24. Which of the following diseases are transmitted through air?

(a) Typhoid, cholera and pneumonia
(b) AIDS, tuberculosis and pneumonia
(c) Tuberculosis and pneumonia
(d) All of the above diseases

25. The water that is purified and fit for drinking is called

(a) Potable water
(b) Pure water
(c) Hard water
(d) Saline water

+1 vote
by (14.5k points)

Answer:

1. Answer: (a) Carbon monoxide

Explanation: Carbon monoxide (CO)—a colorless, odorless, tasteless, and toxic air pollutant—is produced in the incomplete combustion of carbon-containing fuels, such as gasoline, natural gas, oil, coal, and wood.

2. Answer: (b) Nitrogen

Explanation:  Nitrogen is not a greenhouse gas because it is not able to absorb infrared radiation and trap heat in the atmosphere.

3. Answer: (d) 1985

Explanation:  The works of started with the launching of the Ganga Action Plan (GAP) Phase-I in the year 1985. Subsequently, GAP Phase-II was initiated which included the works on the major tributaries of the river Ganga, namely, Yamuna, Gomti and Damodar.

4. Answer: (b) Infrared radiations

Explanation: The short wavelength (high frequency) infrared radiations  come from sun to earth's surface and after reflection from surface , turn into long wavelength infrared radiations , these long wavelength radiations are absorbed by green house gases .

5. Answer: (a) Lead

Explanation: Lead is present in the exhaust of automobiles.The exhaust also contains carbon monoxide and nitrogen oxides.

6. Answer: (d) acid rain

Explanation: Pollutants like sulphur dioxide and nitrogen dioxide in air react with water vapour present in the atmosphere to form sulphuric acid and nitric acid. These acids mix with rain, making it acidic. This acid rain corrodes building material like marble, and the phenomenon is called marble cancer.

7. Answer: (d) aerosols

Explanation: An aerosol is a suspension of fine solid particles or liquid droplets, in air or another gas. Aerosols can be natural or anthropogenic.Colloidal solutions can be classified on the physical state of dispersed phase and dispersion medium. If the dispersion medium is air then the sol is called aerosol.

8. Answer: (a) air pollution

Explanation: The type of pollution which is likely to affect Taj Mahal in Agra to a greater extent is air pollution. It is affecting'Taj Mahal by corroding it and yellowing its marble.

9. Answer: (d) leakage of poisonous gas

Explanation: The Bhopal tragedy, a 1984 chemical spill in Bhopal District, Madhya Pradesh State, India. Approximately 45 tonnes of the toxic gas methyl isocyanate leaked from an insecticide plant operated by the Indian affiliate of the American firm Union Carbide Company on December 3, 1984.

10. Answer: (d) reverse osmosis

Explanation: Water containing high salt concentration can be purified by the process of reverse osmosis. Reverse osmosis is an effective way to remove some unwanted molecules from the water. In the reverse osmosis process, water is let to pass through a membrane, which leads to the separation of water and salt.

11. Answer: (b) DDT

Explanation: DDT, plastics, polythene, lead vapour, silver foils, etc. are non-biodegradable pollutants.

12. Answer: (d) All of the above

Explanation: When a harmful chemical substance, toxic waste, sewage, etc. gets mixed with water the water becomes polluted. It has been found that many industries discharge harmful chemicals into rivers and streams causes water pollution.Untreated sewage and agricultural waste also have similar discharges into water, which results in water pollution.And these are major sources of water pollution.

13. Answer: (c) Drip irrigation

Explanation: In Drip system,water is delivered at or near the roots of plants, drop by drop. This is the most efficient method of irrigation as there is no wastage of water at all.

14. Answer: (c) Reduced oxygen carrying capacity of RBCs

Explanation: This is because when carbon monoxide and oxygen both are available to rbcs then the rbcs will bind 200 times faster with carbon monoxide than oxygen, thus forming carboxyhaemoglobin rather than oxyhaemoglobin.

15. Answer: (b) Smoke + fog

Explanation: A yellowish or blackish fog is named smog. Smoke and fog combine to make smog. It's mainly formed by a mix of pollutants within the atmosphere which consists of fine particles and ground level ozone. Smog occurs mainly due to pollution.

16. Answer: (b) CFCs

Explanation: The gas used in refrigerating appliance causing serious damage to ozone is CFCs.

17. Answer: (d) Sun’s heat is trapped and not allowed to escape

Explanation: Green house effect is a phenomena in which a part of sunlight is trapped by the atmosphere of earth and a part is reflected back to the space. Further, the trapped radiation starts warming the temperature. This is similar to the green house present in a nursery.

18. Answer: (d) Chlorination

Explanation: Chlorination is a commonly used chemical method for purifying water. It kills germs in the water.

19. Answer: (b) Reduce Ganga water pollution

Explanation: The Ganga Action plan was launched in India on 14th January 1986 by Rajiv Gandhi. Its main objective was to protect the river from the hazards of pollution. It aims at improving the quality of its water and preventing further pollution. It acts by preventing the industrial waste from being dumped into the waters.

20. Answer: (d) Planting trees in July

Explanation: Van Mahotsav or Forest Festival is an annual tree-planting festival celebrated in the month of July in which thousands of trees are planted all over the country. Van Mahotsav week is celebrated from 1 July to 7 July to spread awareness of forest conservation and to save the environment.

21. Answer: (c) windmill

Explanation: Windmill will not release any sort of gas into atmosphere hence it is not considered as a source of air pollution.

22. Answer: (a) replace

Explanation: Reduce, reuse and recycle is the formula to conserve natural resource. Replace is not the way to conserve water.

23. Answer: (b) 78%

Explanation:Nitrogen is a colourless, odorless, tasteless and inert gas that accounts for 78 percent of the Earth's atmosphere. So, 78% of Nitrogen is present in the atmosphere.

24. Answer: (c) Tuberculosis and pneumonia

Explanation:  Airborne diseases are characterized by diseases that are transmitted through the air via the presence of a pathogen. These pathogens can include both viruses and bacteria that are spread by coughing, sneezing, laughing, or through personal contact. Many types of infections can be a result of airborne transmission- common cold, Pneumonia, Tuberculosis, etc.Cholera and typhoid are waterborne diseases. AIDS is a sexually transmitted disease.

25. Answer: (a) Potable water

Explanation: Water that has a high amount of dissolved salt is called saline water. Water to which air is added is called aerated water. Mineral water contains minerals like magnesium, calcium, sodium, etc. But potable water is the term used for water that is purified and fit to drink.

 Click here for Practice MCQ Questions for Pollution of Air and Water Class 8

Welcome to Sarthaks eConnect: A unique platform where students can interact with teachers/experts/students to get solutions to their queries. Students (upto class 10+2) preparing for All Government Exams, CBSE Board Exam, ICSE Board Exam, State Board Exam, JEE (Mains+Advance) and NEET can ask questions from any subject and get quick answers by subject teachers/ experts/mentors/students.

Categories

...