Question

Choose the correct answer .
1. Which of the following energy transfer is in the form of short waves ?
a. Insolation b. Terrestrial radiation c. Nuclear radiation d. Ionisation
2. The zone marking change in composition and temperature is called ________
a. Pause b. Tropopause c. Atmosphere d. Ion.
3. The troposphere has the largest concentration of ________
a. Oxygen b. Nitrogen c. Water Vapour d. Atom.
4. In the normal lapse rate of temperature , __________
a. temperature increases with altitude.
b. temperature decreases with altitude.
c. temperature remains constant everywhere.
d. temperature keeps fluctuating every moment .
5. Clouds in the mesosphere are formed due to the presence of __________
a. Moisture b. Smoke c. Cosmic dust d. Ultraviolet rays
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Answer 1

Answer:

Everyone is exposed to UV radiation from the sun and an increasing number of people are exposed to artificial sources used in industry, commerce and recreation. The sun is by far the strongest source of ultraviolet radiation in our environment. Solar emissions include visible light, heat and ultraviolet (UV) radiation. Just as visible light consists of different colours that become apparent in a rainbow, the UV radiation spectrum is divided into three regions called UVA, UVB and UVC. As sunlight passes through the atmosphere, all UVC and most UVB is absorbed by ozone, water vapour, oxygen and carbon dioxide. UVA is not filtered as significantly by the atmosphere.