Sample questions
You've seen the pattern — here are a few of the actual PYQs.
CDS2020
Which one of the following acids is produced in human stomach?
- A Formic acid
- B Sulphuric acid
- C Nitric acid
- D Hydrochloric acid ✓
✓ Correct answer: (D)
Science & Technology › Biology & Health
CDS2020
Which one of the following is the first enzyme to mix with food in the digestive tract?
- A Trypsin
- B Cellulase
- C Pepsin
- D Amylase ✓
✓ Correct answer: (D)
Science & Technology › Biology & Health
CDS2015
In human digestive system, the process of digestion starts in
- A Oesophagus
- B Buccal cavity ✓
- C Duodenum
- D Stomach
✓ Correct answer: (B)
Science & Technology › Biology & Health
Study how UPSC repeats — not just the papers
₹199 / 1 year · Founding Member
Full access unlocks the three things no PYQ PDF gives you:
① Cross-exam learning — see the same idea recur across CSE, CAPF, CDS and NDA.
② Topic evolution — how each idea is framed, year by year.
③ Question intelligence — every PYQ + answer, linked to related concepts and similar questions.
e.g. Round Table Conference: CDS 2017 → CSE 2017 → … → CAPF 2024
15 days free, no card required — then ₹199 for 1 year.
Start your 15-day free trial →