1) Moving air is called _________ . a) Mass b) Wind 2) Air occupies __________ . a) Space b) Water 3) The amount of matter an object contains is its __________ . a) Mass b) Matter 4) The force exerted on us by the weight of tiny particles of air is its air __________ . a) objects b) Pressure 5) Winds blow from _______ pressure area to _______ pressure area. a) high , low b) low , high 6) Identify this instrument. a) hygrometer b) barometer 7) ______ % of air is nitrogen. a) 78 b) 76 8) 21% of air is __________. a) Carbon dioxide b) Oxygen 9) 1% of air is combination of carbon dioxide, ________ and dust particles a) mud b) Water vapour 10) Which gas helps in burning ? a) Nitrogen  b) Oxygen 11) Which gas is used in fire extinguisher ?  a) Nitrogen b) Carbon dioxide 12) Which gas help plants in making food ?  a) Nitrogen b) Carbon dioxide 13) Which gas is useful in making fertilizers? a) Nitrogen b) Carbon dioxide 14) Breathing in is called ___________ and breathing out is called _______ . a) Inhalation /exhalation b) Inhale/exhale 15) Which balloon is inflated. a) b)

AIR

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