Q15 of 20 Page 287

Answer the following question:

The small ozone layer on top of the stratosphere is crucial for human survival. Why?

The small ozone layer on top of the stratosphere is crucial for human survival because ozone layer present on top of the stratosphere helps in preventing the harmful UV radiation from reaching the Earth’s surface and absorbs it. If it reaches the Earth’s surface it can cause many serious harms to the people.


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15

Answer the following question:

It is necessary to use satellites for long distance TV transmission. Why?

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Answer the following question:

Optical and radio telescopes are built on the ground but X-ray astronomy is possible only from satellites orbiting the earth. Why?

 15

Answer the following question:

If the earth did not have an atmosphere, would its average surface temperature be higher or lower than what it is now?

 15

Answer the following question:

Some scientists have predicted that a global nuclear war on the earth would be followed by a severe ‘nuclear winter’ with a devastating effect on life on earth. What might be the basis of this prediction?