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
Temperature of thermosphere is up to
  1. 120°C
  2. 1200°C
  3. 1800°C
  4. 1000°C
Maximum amount of ozone (O3) is present in
  1. troposphere
  2. stratosphere
  3. thermosphere
  4. mesosphere
PH of acid rain is
  1. more than 5.6
  2. less than 5.6
  3. 10
  4. 7
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