Unit 4. class 8th General Science

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Preparation quiz for etea and other competitive exams. Class 8th General Science, Unit4 Pollution and their effects on the environment.

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General Science

Unit 4. Class 8th General Science

Unit 4. pollution and their effect on the environment. Class 8th General Science

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1. Atmosphere consist of 78% nitrogen, 21% oxygen, 1% argon and 0.03%......

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2. The addition of certain contaminants or pollutants to the environment is called

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3. Pollution began to be recognized as a serious threat during the industrial revolution of the

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4. CNCS means

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5. Sulphur dioxide is produced as a result of various

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6. The key source of sulphur dioxide include

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7. Smoke release from thermal power plants contains

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8. Oxidation of SO2 forms

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9. Lungs cancer is caused by

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10. Cardiovascular diseases are caused by

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11. Destroys chloroplast in plants

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12. ..... can be observed as a brown haze above the cities

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13. Coal and oil are burnt at high temperature in industries and engines of vehicles.

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14. can caused heart failure.

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15. is a colorless, odourless, non-irritating but very poisonous gas.

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16. is produced by the incomplete combustion of coal and other fossil fuels.

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17. Smoke released from motor vehicles and industries is the main source of

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18. Damage to the central nervous system

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19. Reducting in the oxygen-carrying capacity of hemoglobin.

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20. are the main cause of Skin cancer.

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21. Compound of chlorine, fluorine, and carbon atoms.

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22. Major cause breaks down of ozone layer.

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23. are used in aerosol spray, as a cooling agent in refrigerators, AC, and foam packing.

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24. Chemical reactions involving air pollutants can  create acidic rain compounds

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25. can cause damage to vegetation and buildings.

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26. can destroy leaves of plants.

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27. the result of excessive oxides of carbon, sulphur, nitrogen, and smoke in the atmosphere.

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28. Stone buildings are corroded called stone cancer by

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29. Kill aquatic life, destroy leaves and bark, corrodes the metals and stones of buildings, damage the Crops by

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30. Ozone is a Greek word which means

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31. Ozone made of ... oxygen atoms O3

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32. The upper part of the atmosphere has a high concentration of ozone molecules, known as the ozone layer or

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33. One .... molecule from CFCs can destroy up to 100,000 ozone molecules.

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34. At least 25% of the total area of a country must be covered by forest but in Pakistan, only ..... of the total area is covered

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35. Oxygen, freshwater, solar energy, timber, and biomass  are

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36. Fossil fuels, metal ores, and groundwater are

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37. Rain can Carry oxides of nitrogen to rivers and soil, which can lead to abnormal growth of algae, this is called

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38. Greenhouse gases are Carbon (Co2), methane, oxides of nitrogen, water vapors, ozone and oxygen

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39. Global warming and climate change is due to

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40. which of the following is not a greenhouse gas:

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The average score is 94%

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