Skip to content

Which are the correct… (Class 10 Science SQP 2025-26, Q6)

questionbuddy.in/q/cbse-10-science-2025-26-sqp-q6-related-ozone-ozone-layer-helps

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

CBSE Class 10 Science sample paper 2025-26: question 6

From the official CBSE sample question paper for 2025-26, section A, question 6, for 1 mark. Try it first; the hints and our step-by-step solution are below.

Q6 · 1 mark · MCQOur Environment

Which are the correct statements related to ozone?
(i) Ozone layer helps in increasing the UV radiations reaching earth.
(ii) Ozone is a deadly poison.
(iii) Ozone layer shields the earth from UV radiations.
(iv) Ozone layer prevents UV rays which cause skin cancer.
(v) Ozone is formed with the help of Chloroflurocarbons.

  1. (A)(i), (ii), (iii)
  2. (B)(ii), (iii), (iv)
  3. (C)(iii), (iv), (v)
  4. (D)(i), (iv), (v)

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

Does ozone increase or decrease the UV reaching us?

Hint 2

Do CFCs make ozone or destroy it?

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. (i) is wrong, because the ozone layer reduces the UV radiation reaching the earth. (v) is wrong, because CFCs deplete ozone. Ozone is formed when UV light acts on O.

  2. (ii) is correct: at ground level ozone is a deadly poison. (iii) and (iv) are correct: the layer shields the earth from UV rays, which cause skin cancer. So the answer is (B) (ii), (iii), (iv).

    1 mark

Answer: Option (B): (ii), (iii), (iv)

Where the marks are

  • Rejects (i) and (v) and selects (B) (1 mark)

Revise the chapter

Practise this chapterBoard-style questions from Our Environment, 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.