MCQ Questions for Class 8 Science Chapter 18 : NCERT CBSE RBSE other Board MCQ Questions for Class 8 Science Chapter 18 Pollution of Air and Water with Answers Pdf free download. MCQ Questions for Class 8 Science with Answers were prepared based on the latest exam pattern.
MCQ Questions for Class 8 Science Chapter 18 Pollution of Air and Water with Answers
Q1. Which gas is the major pollutant of air?
(a) Carbon monoxide
(b) Nitrogen
(c) Oxygen
(d) Propane
Answer: (a) Carbon monoxide
Q2. CFC is:
(a) Chloro fluoro carbon
(b) Carbon fluo ro carbon
(c) Carbon fourme carbon
(d) Carbon fluoro chloro.
Answer: (a) Chloro fluoro carbon
Q3. The increase in concentration of which gas is not responsible for Global Warming?
(a) Sulphur dioxide
(b) Nitrogen
(c) Carbon dioxide
(d) Methane
Answer: (b) Nitrogen
Q4. The reason for greenhouse effect is:
(a) Decrease in quantity of CO2 in atmosphere
(b) Increase in quantity of CO2 in atmosphere
(c) Decrease in quantity of oxygen in atmosphere
(d) Increase in quantity of oxygen in atmosphere
Answer: (b) Increase in quantity of CO2 in atmosphere
Q5. In which year Ganga Action Plan was launched?
(a) 1980
(b) 1984
(c) 1982
(d) 1985
Answer: (d) 1985
Q6. The gas depleting ozone layer is:
(a) Nitrogen.
(b) Oxygen
(c) CFC
(d) Carbon dioxide
Answer: (b) Oxygen
Q7. What radiations are absorbed by CO2?
(a) Ultrared radiations
(b) Infrared radiations
(c) Ultraviolet radiations
(d) None of these
Answer: (b) Infrared radiations
Q8. The greenhouse effect gas is:
(a) CO2
(b) Methane
(c) CFC
(d) All of these
Answer: (d) All of these
Q9. Which element is present in the exhaust of automobiles?
(a) Lead
(b) Calcium
(c) Chromium
(d) Magnesium
Answer: (a) Lead
Q10. Better fuel is:
(a) Peton
(b) Diesel
(c) Coal
(d) CNG
Answer: (d) CNG
Q11. The phenomenon of marble cancer is due to
(a) soil particles
(b) fog
(c) CFCs
(d) acid rain
Answer: (d) acid rain
Q12. The following gas is not an air pollutant:
(a) Carbon dioxide
(b) Oxides of nitrogen
(c) Sulphur dioxide
(d) Oxygen
Answer: (d) Oxygen
Q13. The solid or liquid particles dispersed in the air are called
(a) oxides
(b) acids
(c) hydrocarbons
(d) aerosols
Answer: (d) aerosols
Q14. The following gas forms acid rain:
(a) Carbandioxide
(b) Ozone
(c) Sulphur dioxide
(d) Carbon monoxide
Answer: (c) Sulphur dioxide
Q15. 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
Answer: (a) air pollution
Question 16.
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
Answer: (c) Reduced oxygen carrying capacity of RBCs
Question 17.
Smog =
(a) Smoke in dog’s stomach
(b) Smoke + fog
(c) Smoke dog
(d) frog in fog
Answer: (b) Smoke + fog
Question 18.
The gas used in refrigerating appliance causing serious damage to ozone is
(a) MFCs
(b) CFCs
(c) LPCs
(d) DPCs
Answer: (b) CFCs
Question 19.
Acid rain mainly contains
(a) Sodium chloride
(b) Sulphur dioxide and Nitrogen dioxide
(c) Hydrochloric acid
(d) Carbon tetra chloride
Answer: (b) Sulphur dioxide and Nitrogen dioxide
Question 20.
Marble cancer is caused by
(a) bacteria
(b) virus
(c) Acid rain
(d) Alkali rain
Answer: (c) Acid rain
Question 21.
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
Answer: (d) Sun’s heat is trapped and not allowed to escape
Question 22.
Greenhouse gases includes
(a) CO2, Methane, Nitrous oxide
(b) CO2, Argon, Nitrous oxide
(c) CO2, Methane, Chlorine
(d) CO2, Methane, Flourine
Answer: (a) CO2, Methane, Nitrous oxide
Question 23.
_____ is a commonly used chemical method for purifying water.
(a) Brominization
(b) Flourination
(c) Filtration
(d) Chlorination
Answer: (d) Chlorination
Question 24.
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
Answer: (b) Reduce Ganga water pollution
Question 25.
Van Mahotsav is
(a) Planting trees in January
(b) Cutting trees in January
(c) Cutting trees in July
(d) Planting trees in July
Answer: (d) Planting trees in July
Match the following items given in Column ‘A’ with that in Column ‘B’:
| Column A | Column B |
| (i) Greenhouse gas | (a) Absorbed by CO2 |
| (ii) Infrared radiations | (b) Polluting gas |
| (iii) Oxides which affect vegetation | (c) Fog |
| (iv) Sulphur dioxide | (d) Caused by smog |
| (v) Condensed wider vapour in air | (e) Smoke + fog + fumes |
| (vi) Asthma | (f) Carbon dioxide |
| (vii) Smog | (g) Nitrogen oxides |
Answer:
| Column A | Column B |
| (i) Greenhouse gas | (f) Carbon dioxide |
| (ii) Infrared radiations | (a) Absorbed by CO2 |
| (iii) Oxides which affect vegetation | (g) Nitrogen oxides |
| (iv) Sulphur dioxide | (b) Polluting gas |
| (v) Condensed wider vapour in air | (c) Fog |
| (vi) Asthma | (d) Caused by smog |
| (vii) Smog | (e) Smoke + fog + fumes |
