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Choose the correct… (Class 10 Science SQP 2025-26, Q31)

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ScienceCBSE Class 10 · Sample paper, session 2025-26 · 1 mark · MCQ

CBSE Class 10 Science sample paper 2025-26: question 31

From the official CBSE sample question paper for 2025-26, section C, question 31, for 1 mark. Try it first; the hints and our step-by-step solution are below.

Q31 · 1 mark · MCQThe Human Eye and the Colourful World

Choose the correct option from the below which explains the reason for us to perceive the day sky as blue.

  1. (A)As sunlight passes through the atmosphere, shorter wavelengths, such as blue are scattered more than other colors.
  2. (B)The sky appears blue because all colors are scattered equally, but blue light is stronger and more visible to the human eye.
  3. (C)The blue color of the sky is due to longer wavelengths like red and orange scattering more than shorter wavelengths, making blue stand out more.
  4. (D)The atmosphere contains blue-colored particles that give the sky its blue appearance.

Source: official sample paper from cbseacademic.nic.in (PDF). See it in the full Sample paper 2025-26.

Hints

Open one hint at a time and try again before the next.

Hint 1

Which phenomenon of light explains the colour of the sky?

Hint 2

Do small particles scatter shorter or longer wavelengths more?

Step-by-step solution

Each step shows the marks it earns, as an examiner would award them. Checked by an independent re-solve from the question paper.

  1. Air molecules are much smaller than the wavelength of visible light. They scatter shorter wavelengths (blue end) much more strongly than longer ones (red end).

  2. This scattered blue light reaches our eyes from all directions, so the sky looks blue. Our eyes are also more sensitive to blue than to violet. Option (A).

    1 mark

Answer: Option (A)

Where the marks are

  • Chooses scattering of shorter (blue) wavelengths, option (A) (1 mark)

Revise the chapter

Practise this chapterBoard-style questions from The Human Eye and the Colourful World, one at a time, marked against the answer key and marking points.Back to the full paperSample paper 2025-26: every question, by section.

The question is transcribed from the official paper; figures are described in words. The solution, hints and chapter tag are ours. Spotted an error? Write tosupport@questionbuddy.in.