1) Light gas of atmosphere a) helium b) hydrogen c) Oxygen d) None Both A and B e) Both B and C 2) Important layer of Atmosphere a) Stratosphere b) Troposphere c) Mesosphere d) Thermosphere 3) Heaviest Gas of Atmosphere a) Nitrogen b) Oxegyen c) Carbon Dioxide d) Ozone 4) Neon has how much Volume(%) a) 0.0005 b) 0.0018 c) 0.93 d) 20.94 5) _____________ is the second most gas in the Atmosphere a) Neon b) Ozone c) Oxygen d) Argon 6) Airplane fly in _____________ layer. a) Troposphere b) Saratosphere c) Mesosphere d) Ionosphere 7) Which one of the following phenomena is the greenhouse effect. a) Air on the earth b) Ozone layer in atmosphere c) Global warming d) None of these 8) In which of the following gas is protect us from the harmful ways of the Sun. a) Oxygen b) Carbon dioxide c) Ozone d) Argon

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