Class X

Amount of Nitrogen (N2) present in dry air is
  1. 20%
  2. 78%
  3. 48%
  4. 68%
Layer which protects earth from being hit by meteoroids is
  1. Troposphere
  2. Mesosphere
  3. Thermosphere
  4. Stratosphere
Atmosphere consists of
  1. gases
  2. water vapors
  3. chemicals
  4. both A and B
Gas responsible for global warming is
  1. oxygen
  2. carbon dioxide
  3. carbon monoxide
  4. oxygen
Ozone gas (O3) has
  1. pleasant odor
  2. unpleasant odor
  3. no odor
  4. orange color
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