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Consider the following… (Science 2024 31/2/1 Q13)

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ScienceCBSE Class 10 · Board exam 2024, set 31/2/1 · 1 mark · MCQ

CBSE Class 10 Science 2024: question 13

Set in the CBSE Class 10 board exam of 2024, paper 31/2/1, section A, question 13, for 1 mark. Try it first; the hints and our step-by-step solution are below.

Q13 · 1 mark · MCQThe Human Eye and the Colourful World

Consider the following statements in the context of human eye :
(a) The diameter of the eye ball is about 2.3 cm.
(b) Iris is a dark muscular diaphragm that controls the size of the pupil.
(c) Most of the refraction for the light rays entering the eye occurs at the crystalline lens.
(d) While focusing on the objects at different distances the distance between the crystalline lens and the retina is adjusted by ciliary muscles.

The correct statements are –

  1. (A)(a) and (b)
  2. (B)(a), (b) and (c)
  3. (C)(b), (c) and (d)
  4. (D)(a), (c) and (d)

Source: official question paper from cbse.gov.in (PDF). See it in the full 2024 board paper, set 31/2/1.

Hints

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

Hint 1

Where does most of the bending of light occur in the eye?

Hint 2

Does the lens move, or does its shape change?

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. (a) is true: the eyeball is about 2.3 cm in diameter. (b) is true: the iris controls the size of the pupil.

    ½ mark

  2. (c) is false: most refraction happens at the outer surface of the cornea. (d) is false: ciliary muscles change the focal length of the lens, not its distance from the retina. Option (A) is correct.

    ½ mark

Answer: (a) and (b): option (A)

Where the marks are

  • Selects 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 paper2024 board paper, set 31/2/1: 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.