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UPSC 2001: Assertion (A): A stick is dipped in water in a slanting position. If observed sideways, the stick appears short and bent at the surface of water. Reason (R): The light coming from the stick undergoes scattering from water molecules giving the stick a short and bent appearance.
(a)Both A and R are individually true and R is the correct explanation of A
(b)Both A and R are individually true but R is NOT a correct explanation of A
(c)A is true but R is false
(d)A is false but R is true
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Not attemptedCorrect Answer: (c) A is true but R is false
A partially immersed stick looks shorter and bent because light rays bend (refract) when they pass from water to air; the assertion is therefore correct. The reason given talks about scattering by water molecules, which is not the phenomenon responsible for the visual effect, so it is false. Hence, A is true but R is false. ([britannica.com](https://www.britannica.com/science/refraction?utm_source=openai))
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Frequently Asked Questions
What is the correct answer to this UPSC 2001 Science & Technology question?▼
The correct answer is option (c): A is true but R is false. Watch the detailed video explanation in our Sherlocking Prelims course on UnlockIAS.
Which year was this Physics question asked in UPSC Prelims?▼
This question was asked in UPSC CSE Prelims 2001, GS Paper 1, as Question 101. It falls under Science & Technology > Physics.
What is the difficulty level of this UPSC question?▼
This question is rated "moderate". It requires sound conceptual understanding of the topic.
How many UPSC Prelims questions have been asked from Physics?▼
UPSC has asked 104 questions from Physics (under Science & Technology) across multiple years. Visit the topic page to see the full list and year-wise trends.