Geography (World, India and Kerala)
Geography (World, India and Kerala) tests location, climate, drainage, soils, population and map-based reasoning. Kerala questions usually focus on the Western Ghats, monsoon, rivers, backwaters and districts.
Core rules
- Latitude controls temperature; longitude controls local time. Rotation causes day and night; revolution and axial tilt cause seasons.
- India's monsoon: southwest monsoon June–September; northeast monsoon October–December, important for Tamil Nadu and parts of Kerala.
- Kerala: 14 districts; Western Ghats in the east; Palakkad Gap is a low mountain pass, not a river; west-flowing rivers are short and fast.
- Kerala rivers: Periyar is the longest (about 244 km); Bharathappuzha is second; Vembanad is the largest backwater/lake.
- Districts: Idukki is the largest by area; Malappuram is the most populous; Kasaragod is northernmost; Thiruvananthapuram is southernmost.
Worked example
Why does Kerala receive heavy June–September rain? Reasoning: moist southwest monsoon winds from the Arabian Sea strike the Western Ghats; air is forced to rise, cools and condenses; orographic rainfall follows. The coast is the first barrier, so Kerala gets early and heavy rain.
Traps
Do not call Bharathappuzha the longest Kerala river. Do not confuse the Palakkad Gap with a river valley. Kerala borders only Karnataka and Tamil Nadu; it has no land border with Andhra Pradesh or Goa.