TNPSC Group II · Bite-size lessons
Geography of India
About 5 min · General Studies · English
Time worked out from the lesson's 272 words at 150 words a minute, plus a minute for each question.
The questions test factual recall (rivers, passes, states) as well as conceptual understanding (monsoon mechanism, soil formation, population patterns).
Key ideas
- Physiographic Divisions: India has six major divisions—Northern Mountains (Himalayas), Northern Plains (Indo-Gangetic), Peninsular Plateau (Deccan), Coastal Plains (Eastern & Western), Desert (Thar), and Islands (Andaman-Nicobar, Lakshadweep).
- Monsoon Mechanism: The Indian monsoon is driven by differential heating of land and sea, causing pressure reversals. Southwest monsoon (June–September) brings 75% of annual rainfall; Northeast monsoon (October–December) is crucial for Tamil Nadu.
- Drainage Systems: Himalayan rivers are perennial (snow-fed); Peninsular rivers are seasonal (rain-fed). West-flowing rivers (Narmada, Tapi) form estuaries; east-flowing rivers (Godavari, Krishna, Kaveri) form deltas.
- Soil Types: Six major soils—Alluvial (most fertile, Northern Plains), Black/Regur (cotton, Deccan), Red (Tamil Nadu, Odisha), Laterite (Kerala, heavy rainfall areas), Desert (sandy, saline), Mountain (thin, acidic).
- Natural Vegetation Zones: Tropical Evergreen (Western Ghats), Tropical Deciduous (largest area), Thorn Forests (Rajasthan), Montane Forests (Himalayas), Mangroves (Sundarbans).
Quick reference
- 7 border countries: Pakistan, Afghanistan, China, Nepal, Bhutan, Bangladesh, Myanmar (Mnemonic: PAC-NBB-M)
- Standard Meridian: 82°30'E passes through Mirzapur (UP); IST = GMT + 5:30
- Tropic of Cancer: Passes through 8 states—Gujarat, Rajasthan, MP, Chhattisgarh, Jharkhand, West Bengal, Tripura, Mizoram
- Black soil = Regur = Cotton soil → Maharashtra, MP, Gujarat
- Tamil Nadu rivers: Kaveri, Vaigai, Tamiraparani, Palar, Pennar
Check yourself: 3 questions
1. The Deccan Plateau is bordered by which two mountain ranges on its eastern and western sides?
2. Which of the following rivers does NOT originate in the Western Ghats?
3. According to Census 2011, which state in India has the highest population density?
This lesson is cut from the topic's note, not rewritten. Fact-checked on 17 Oct 2026: an AI-assisted check of this note against cited sources; the errors it found were corrected that day. Some errors may remain. The questions are from Shishya's validated question bank.
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