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Topic Tyndall effect
Asked 4 times across 3 UPSC exams over 7 years (2019–2026), peaking in 2019.
Key insights
- Most tested in NDA — 2 of 4 PYQs
- Most asked in 2019
- Recurs across 4 years (2019–2026)
How it travelled across exams
First appearance in each exam — the same idea, reframed.
CAPF 2019 → EPFO 2020 → NDA 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.
NDA2026
Consider the following statements
- A colloid and a suspension are heterogeneous mixtures
- Colloids can be separated from the mixture by the process of centrifugation
- Particles of colloids and suspensions can be seen by naked eye
- The aqueous solution of copper sulphate does not show Tyndall effect; however, the mixture of milk and water shows Tyndall effect
Which of the statements given above is/are correct?
- A I only
- B II and III only
- C I, II and III
- D I, II and IV ✓
✓ Correct answer: (D)
Science & Technology › Physics & Chemistry
NDA2023
Which among the following is NOT true with respect to colloidal solution ?
- A Particles are uniformly distributed throughout the solution
- B Colloidal solution is homogenous in nature ✓
- C They show Tyndal effect
- D They do not settle down when kept undisturbed
✓ Correct answer: (B)
Science & Technology › Physics & Chemistry
EPFO2020
Which one of the following, on adding to water, will not scatter a beam of light ?
- A Copper sulphate ✓
- B Chalk powder
- C Milk
- D Ink
✓ Correct answer: (A)
Science & Technology › Physics & Chemistry
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