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Topic Drainage System
Asked 4 times across 2 UPSC exams over 5 years (2018–2023), peaking in 2018.
Key insights
- Most tested in CDS — 3 of 4 PYQs
- Most asked in 2018
- Recurs across 2 years (2018–2023)
How it travelled across exams
First appearance in each exam — the same idea, reframed.
CDS 2018 → CISF 2023
How the concept evolved
Rising — more than half its appearances (4 of 4) are since 2016.
Related concepts
Ideas UPSC tests alongside this one — keep exploring.
Sample questions
You've seen the pattern — here are a few of the actual PYQs.
CDS2023
Indus river basin is extended up to
- A Ladakh, Jammu and Kashmir, Himachal Pradesh, Punjab
- B Ladakh, Jammu and Kashmir, Punjab, Haryana
- C Ladakh, Jammu and Kashmir, Punjab, Haryana, Rajasthan
- D Ladakh, Jammu and Kashmir, Himachal Pradesh, Punjab, Haryana, Rajasthan ✓
✓ Correct answer: (D)
Geography › Physical Geography of India
CISF2023
Which one of the following states is part of the Ganga Basin?
- A Himachal Pradesh ✓
- B Sikkim
- C Assam
- D Odisha
✓ Correct answer: (A)
Geography › Physical Geography of India
CDS2018
Which one of the following is a west-flowing river?
- A Mahanadi
- B Godavari
- C Krishna
- D Narmada ✓
✓ Correct answer: (D)
Geography › Physical Geography of India
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