Core5 mapped NDA questions
Build the idea
Build exam-ready understanding by connecting the core idea, formulas or facts, worked example and previous NDA questions. Focus on why each rule works, then test it under timed conditions.
Concept
India has diverse physical regions: the northern Himalayas, the northern plains, the peninsular plateau, the coastal plains and the islands. Each has distinct relief, rivers, climate and resources.
The Himalayas are the source of major north-Indian rivers.
Key Points & Formulas
- Physical divisions: Himalayas, Northern Plains, Peninsular Plateau, Coastal Plains, Islands.
- Himalayan rivers (Ganga, Brahmaputra) are perennial (snow-fed).
- Peninsular rivers (Godavari, Krishna) are rain-fed.
- The Deccan Plateau is rich in minerals.
Worked Example
Q. Why are Himalayan rivers perennial while peninsular rivers are seasonal?
Himalayan rivers are fed by both rainfall and melting snow/glaciers.
So they flow throughout the year (perennial).
Peninsular rivers depend only on rainfall, so they shrink in the dry season.