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Geography [3 Mark Question Answer]

Humidity · ICSE STD 9 (ICSE - English Medium). 4 questions.

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[3 Mark Question Answer]

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4 questions · timed · auto-graded

Question 13 Marks
State the three types of rainfall.
Answer
  • Relief Rainfall – It occurs from the cooling of warm moist air which ascends above the mountain barrier lying in the direction of the prevailing winds.
  • Cyclonic or Frontal Rainfall – It occurs when warm and cold air masses confront each other, the warmer air generally climbs above the colder air.
  • Convectional Rainfall – Ascending currents of hot and humid air causes condensation of the clouds, resulting in heavy rainfall.
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Question 23 Marks
Describe the three chief ways in which condensation occurs.
Answer
Three chief ways to assist condensation are :
  1. High amount of moisture present in the atmosphere.
  2. The elements providing the nuclei for it should be present in the atmosphere, e.g., dust particles, salt, and smoke, etc.
  3. The air should be saturated i.e. the relative humidity must be 100% to create dew point or the temperature should be below the dew point.
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Question 33 Marks
With reference to condensation, define the following : Atmospheric conditions that favour condensation.
Answer
The atmospheric conditions that favour condensation are :
  1. There should be a high amount of water vapour present in the atmosphere.
  2. Minuscule particles of dust, salt, and even smoke act as condensation nuclei.
  3. The temperature of air must be below dew point temperature so as to encourage condensation
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Question 43 Marks
The windward sides of mountains receive more rainfall than the leeward sides.
Answer
The windward sides of mountainous slopes get ample rainfall by striking with the rain-bearing winds first, while the leeward sides cannot get sufficient rainfall due to being on other side where the winds become almost dry due to imparting rainfall in windward due to loss of major part of moisture and water drops.
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[3 Mark Question Answer] - Geography STD 9 Questions - Vidyadip