1.
The layer of the atmosphere in which air travel is most convenient is
mesosphere.
stratosphere.
thermosphere.
troposphere.
2.
The weather on earth is determined by changes in temperature, pressure and winds that take place in the
thermosphere.
strastosphere.
mesophere.
troposphere.
3.
The gas in the stratosphere that absorbs ultraviolet rays to minimize the heat reaching the earth's surface is
carbon (IV) dioxide.
chlorofluorocarbons.
oxygen.
ozone.
4.
Which of the following substances contribute(s) to the depletion of the ozone layer?
I. Carbon (II) oxide
II. Chlorofluorocarbon
III. Carbon (IV) oxide
I only
II only
I and II only
II and III only
5.
The following substance are air pollutants except
fertilizer.
sulphur(Iv) oxide.
dust.
exhaust fumes
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