Tuesday , July 5 2022
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NCERT 7th Class (CBSE) Social Science: Humidity and Rainfall

Question: What do you understand by dew point.

Answer: The temperature at which condensation takes place is called the dew point.

Question: What is sleet?

Answer: Sleet is a form of precipitation which is a combination of snow flakes and rain falling together.

Question: What is fog? How is it different from mist?

Answer: During winters humid air comes into contact with the cold surface of the earth due to which condensation takes around floating dust particles forming a cloud at ground level. This is called fog. Thin fog is termed as mist. Fog reduces visibility and often causes accidents.

Question: Explain relief rainfall.

Answer: Relief or orographic rainfall is the type of rainfall that takes place when moisture-laden wind from the sea is forced to rise above a hill or a mountain range. On rising, the wind cools and drops most of its moisture on the mountain side facing the wind. The other side remains relatively dry. For example, Mumbai on the west coast being on the wind facing side or the windward side of the Western Ghats receives more rain during monsoons than Pune which is on the opposite or the leeward side.

Question: Differentiate between relief rainfall and convectional rainfall.

Answer: Difference between relief rainfall and convectional rainfall is:

Relief Rainfall
Convectional Rainfall
1. Relief rainfall takes place due to the relief or height of a place.
1. Convectional rainfall, on the other hand, is caused by local heating due to which air rises vertically.
2. When moisture-laden wind from the sea is forced to rise above a hill or a mountain range, the wind cools and drops most of its moisture on the mountain side facing the wind.
2. On reaching a certain height, condensation takes place, which is followed by precipitation at the same place. Such rainfall occurs mainly in equatorial areas.

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