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1) The large number of organisms can die if there is a. low level of oxygen b. low level of carbon dioxide c. low level of methane d. low level of ethane
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2) The waste which takes 3 to 4 weeks to be decomposed in landfill is a. banana peel b. wooden log c. disposable diaper d. leather shoe
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3) The waste which takes 80 to 100 years to be decomposed in landfill is a. paper bag b. plastic bag c. aluminum can d. disposable diaper
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4) The layer of atmosphere that absorbs ultraviolet rays from Sun is called a. troposphere b. ozone layer c. thermosphere d. mesosphere
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5) The air condition equipment, leaking refrigerators, spray cans and burning of plastic foams release a. carob-oxides b. herbicides c. pesticides d. chlorofluorocarbon
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6) The Chlorofluorocarbon (CFC) remains in atmosphere for a. 22 to 111 years b. 30 to 50 years c. 80 to 90 years d. 10 to 20 years
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7) The waste which takes 1 month to be decomposed in landfill is a. leather shoe b. banana peel c. plastic bag d. paper bag
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8) The continent whose rivers are most polluted in world is a. Africa b. Asia c. North America d. South America
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9) The causes of air pollution includes a. chlorofluorocarbon b. cars and motor vehicles c. power plants and industries d. all of above
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10) According to World Health Organization, the percentage of the deaths due to environmental factors is a. 85% b. 25% c. 50% d. 65%
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