1) Nitrogen constitutes nearly______ % of the atmosphere. a) 21% b) 79% c) 55 % d) 5% 2) Air is a) An element b) A mixture c) A compound d) None of these 3) Carbon dioxide is lighter than air. a) True b) False c) Some are light and some are r heavy 4) The most important layer of the atmosphere is a) Troposphere b) Mexoxsphere c) Thermosphere d) Exosphere 5) A barometer is used for measuring a) Atmospheric pressure b) Annual rainfall c) humidity d) Temperature 6) Exosphere is the fifth and last layer of the earth's atmosphere. As this layer has very thin air, what is different in this layer? a) Earth can be seen b) Humans can never go here c) Hydrogen and helium don't float d) Light gas is float here 7) Identify the gas known as greenhouse gas a) Oxygen b) Nitrogen c) Carbon dioxide d) Argon 8) What is the standard unit of measuring temperature? a) Calorie b) Joules c) Watt d) Degree Celsius 9) Which of these is not a permanent wind a) Westerlies b) Polar winds c) Trade winds d) Monsoon winds

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