Questions (120)
Q1CDS2023
A sprinter feels cramps and pain in the thigh muscles after a run. This is due to accumulation of
- A lactic acid ✓
- B CO2
- C pyruvic acid
- D ethanol
✓ Correct answer: (A)
Science & Technology › Biology & Health
Q2CDS2023
A leaf was plucked from a plant on a sunny day and kept for 2 minutes in boiling water. It was subsequently immersed in boiling alcohol and treated with iodine solution. What will be the final colour of the leaf after the test?
- A Colourless
- B Green
- C Blue ✓
- D White
✓ Correct answer: (C)
Science & Technology › Biology & Health
Q3CDS2023
If the red blood cells (RBCs) of human blood are isolated and are diluted in normal saline (an isotonic solution to blood), what will happen to the RBCs?
- A The RBCs will swell
- B The RBCs will swell and burst
- C The RBCs will shrink
- D No change in the diameters of the RBCs ✓
✓ Correct answer: (D)
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 →