Pollution of Air and Water MCQ Questions for Class 8 Science Chapter 18 with Answers

We have completed the NCERT/CBSE chapter-wise Multiple Choice Questions for Class 8 Science book Chapter 18 Pollution of Air and Water with Answers by expert subject teacher for latest syllabus and examination. You can Prepare effectively for the exam taking the help of the Class 8 Science Objective Questions PDF free of cost from here. Students can take a free test of the Multiple Choice Questions of Pollution of Air and Water. Each Questions has four options followed by the right answer. Download the Science Quiz Questions with Answers for Class 8 free Pdf and prepare to exam and help students understand the concept very well.

MCQ Questions for Class 8 Science with Answers

Q1. The gas depleting ozone layer is:

(i) Nitrogen.
(ii) Oxygen
(iii) CFC
(iv) Carbon dioxide

(ii) Oxygen

Q2. The phenomenon of marble cancer is due to

(i) soil particles
(ii) fog
(iii) CFCs
(iv) acid rain

(iv) acid rain

Q3. Last stage in treatment of sewage is

(i) Sterilization
(ii) Evaporate
(iii) Chlorination
(iv) Aeration

(iii) Chlorination

Q4. The increase in concentration of which gas is not responsible for Global Warming?

(i) Sulphur dioxide
(ii) Nitrogen
(iii) Carbon dioxide
(iv) Methane

(ii) Nitrogen

Q5. What causes pollution

(i) Human activities
(ii) Trees
(iii) Human activities and trees
(iv) None of the options

(i) Human activities

Q6. The percentage of nitrogen in air is

(i) 21%
(ii) 78%
(iii) 12%
(iv) 87%

(i) 78%

Q7. Better fuel is:

(i) Peton
(ii) Diesel
(iii) Coal
(iv) CNG

(iv) CNG

Q8. The solid or liquid particles dispersed in the air are called

(i) oxides
(ii) acids
(iii) hydrocarbons
(iv) aerosols

(iv) aerosols

Q9. Which of the following is not a green house gas?

(i) Water vapour
(ii) Nitrogen gas
(iii) Methane gas
(iv) Carbon dioxide

(ii) Nitrogen gas

Q10. What radiations are absorbed by CO2?

(i) Ultrared radiations
(ii) Infrared radiations
(iii) Ultraviolet radiations
(iv) None of these

(ii) Infrared radiations

Q11. Air pollution causes

(i) Respiratory problems
(ii) Global warming
(iii) Soil erosion
(iv) None of the options

(i) Respiratory problems

Q12. Addition of harmful substance in water to make it unfit for human consumption is called

(i) Water pollution
(ii) Biomagnifications
(iii) Decomposition
(iv) Retardation

(i) Water pollution

Q13. Which of the following Is not a pollutant unless present in excess:

(i) Nitrogen dioxide
(ii) Carbon dioxide
(iii) Carbon monoxide
(iv) Sulphur dioxide

(ii) Carbon dioxide

Q14. The Taj Mahal is being affected due to

(i) noise pollution
(ii) air pollution
(iii) water pollution
(iv) soil pollution

(ii) air pollution

Q15. Finer hair inside the nose

(i) Filter the microbes
(ii) Prevent the water vapour
(iii) Filter the dust particle
(iv) Prevent the carbon dioxide gas

(iii) Filter the dust particle

Q16. The type of pollution which is likely to affect Taj Mahal in Agra to a greater extent is

(i) air pollution
(ii) soil pollution
(iii) water pollution
(iv) noise pollution

(i) air pollution

Q17. Highest percentage of air consists of

(i) Nitrogen
(ii) Oxygen
(iii) Carbon dioxide
(iv) Argon

(i) Nitrogen

Q18. What is the effect of sulphur dioxide present in air on human beings?

(i) Harms the skin and the lungs
(ii) Mixes with the blood and prevents it from carrying oxygen
(iii) Affects the heart and the liver
(iv) Raises the air temperature

(i) Harms the skin and the lungs

Q19. Smog is made up of:

(i) Smog and oxygen
(ii) Sulphur dioxide and fog
(iii) Smog and fog
(iv) None of these

(iii) Smog and fog

Q20. Pollution of water is due to

(i) oil refineries
(ii) paper factories
(iii) sugar mills
(iv) all of these

(iv) all of these

Q21. Which of these is the major air pollutant in cities like Delhi and Kolkata?

(i) Carbon monoxide
(ii) Hydrocarbons
(iii) Suspended particulate matter
(iv) Oxides of nitrogen

(iii) Suspended particulate matter

Q22. Bhopal tragedy was caused due to

(i) air pollution
(ii) emission of poisonous gas
(iii) water pollution
(iv) leakage of poisonous gas

(iv) leakage of poisonous gas

Q23. Most polluted river in the world is:

(i) Yamuna
(ii) Cavery
(iii) Chenab
(iv) Ganga

(iv) Ganga

Q24. We cannot survive a few minutes without

(i) Water
(ii) Food
(iii) Air
(iv) Medicine

(iii) Air

Q25. Ozone layer protect us from:

(i) Infrared rays
(ii) Ultraviolet rays
(iii) White light of sun
(iv) None of these

(ii) Ultraviolet rays

Q26. Which of the following is not a way to conserve water?

(i) Replace
(ii) Reuse
(iii) Reduce
(iv) Recycle

(i) Replace

Q27. Which of the following is major source of water pollution?

(i) Industrial wastes
(ii) Untreated sewage
(iii) Use of fertilisers
(iv) Toxic metals

(ii) Untreated sewage

Q28. The water that is purified and fit for drinking is called

(i) Potable water
(ii) Pure water
(iii) Hard water
(iv) Saline water

(i) Potable water

Q29. Highest percentage of air consists of:

(i) Oxygen
(ii) Carbon dioxide
(iii) Nitrogen
(iv) Argon

(iii) Nitrogen

Q30. Greenhouse effect is

(i) Painting house green in colour
(ii) Wearing green colour dress
(iii) Having green room in the house
(iv) Sun’s heat is trapped and not allowed to escape

(iv) Sun’s heat is trapped and not allowed to escape

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