1) Percentage of hydrogen in the air is a. 0.99 b. 0.8 c. 0.5 d. 0.25
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2) Which of the following have an impact on brain development in human beings especially among children? a. chlorofluorocarbons (CFCs) b. methane c. carbon monoxide d. lead compounds
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3) Which of the following is true about ozone? a. light blue in colour b. odourless c. not harmful d. not a pollutant
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4) Which of the following is a powerful irritant which can aggravate the symptoms of people who suffer from respiratory disorders? a. sulphur dioxide b. carbon monoxide c. carbon dioxide d. oxides of nitrogen
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5) What is meant by the term 'meso'? a. top b. middle c. turning d. changing
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6) Which of the following is further divided into two layers? a. troposphere b. stratosphere c. mesosphere d. thermosphere
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7) Group of chemically unreactive compounds that are commonly used as solvents are called a. chlorofluorocarbons (CFCs) b. functional groups c. alkyl groups d. lead compounds
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8) Which of the following is produced when dead plant material decays in the absence of air? a. chlorofluorocarbons (CFCs) b. methane c. carbon monoxide d. lead compounds
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9) Which two main gases are produced when you burn a piece of wood? a. oxygen and nitrogen b. carbon dioxide and oxygen c. carbon dioxide and carbon monoxide d. carbon dioxide and nitrogen
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10) The occurrence of weather is in a. troposphere b. stratosphere c. mesosphere d. thermosphere
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