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Science — CBSE Class 10 board question

Q1. [1]
When a beam of white light passes through a region having very fine dust particles, the colour of light mainly scattered in that region is :
  1. A Red
  2. B Orange
  3. C Blue
  4. D Yellow
Previously asked in CBSE board exam
2024 31/4/1 Q12
Generated by claude-sonnet-4-6 · 2026-06-15 06:52 · grounding rag
Model Answer

Answer: C — Blue

Very fine dust particles scatter mainly blue light (shorter wavelength) more strongly than light of longer wavelengths, as per the Tyndall effect.

Source: Chapter 10, Section 10.6.1 – Scattering of Light / Tyndall Effect

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Explanation

The key line from the textbook is: "Very fine particles scatter mainly blue light while particles of larger size scatter light of longer wavelengths." Since the question specifies very fine dust particles, the answer is blue. For MCQs, no explanation is needed in the exam — just the correct option letter and a one-line reason to be safe.

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Previous-year CBSE Grade 10 board exam questions, organised by subject and chapter, each with a model answer — free to read and print.