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Precipitation Forms and types of Rain fall — Syllabus

Telangana Open School (TOSS) · Class 12 · Geography

What Precipitation Forms and types of Rain fall covers in Telangana Open School (TOSS) Class 12 Geography: 4 topics, for the 2026-27 session.

45 questions30 flashcards5 concepts

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4 Topics · Telangana Open School (TOSS) Class 12 Geography · 2026-27

Topics in Precipitation Forms and types of Rain fall

1

Humidity and Its Measurement

  • Humidity refers to the amount of water vapour present in the air.
  • There are three ways to measure humidity: Absolute, Specific, and Relative Humidity.
  • Absolute Humidity is the actual amount of water vapour in grams per cubic metre of air.
2

Evaporation and Condensation

  • Evaporation is the process by which water changes from liquid to vapour due to heat from the Sun.
  • Latent heat of vaporisation is absorbed during evaporation and released during condensation.
  • Condensation occurs when moist air cools down to its dew point.
3

Forms of Precipitation

  • Precipitation is any form of water — liquid or solid — that falls from clouds to the Earth’s surface.
  • Main forms include rain, drizzle, snow, sleet, and hail.
  • Rain consists of water droplets larger than 0.5 mm in diameter.
4

Types of Rainfall

  • There are three main types of rainfall: Convectional, Orographic, and Cyclonic.
  • Convectional Rainfall occurs in equatorial regions due to intense heating causing air to rise, cool, and condense — often daily afternoon thunderstorms.
  • Orographic Rainfall happens when moist wind rises over mountains — heavy rain on windward side, dry leeward side (rain shadow).

Key Concepts

Central concept: Precipitation

HumidityEvaporation and CondensationForms of PrecipitationTypes of RainfallCloudsFactors Affecting RainfallWorld Distribution of Rainfall

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Frequently Asked Questions

What are the important topics in Precipitation Forms and types of Rain fall for Telangana Open School (TOSS) Class 12 Geography?
Key topics in Precipitation Forms and types of Rain fall include Humidity and Its Measurement, Evaporation and Condensation, Forms of Precipitation, Types of Rainfall. Study these first, then practise questions on each for the Telangana Open School (TOSS) Class 12 board exam.
How should I revise Precipitation Forms and types of Rain fall for the Telangana Open School (TOSS) Class 12 board exam?
Learn the core ideas first, then work through the 45 practice questions on Precipitation Forms and types of Rain fall. Revise definitions regularly and use flashcards for quick recall before the exam.

Sources & Official References

Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.

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