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Science — CBSE Class 10 board question

Q1. [1]
Consider the following statements about ozone : (a) Ozone is poisonous gas. (b) Ozone shields the earth's surface from the infrared radiation from the sun. (c) Ozone is a product of UV radiations acting on oxygen molecule. (d) At the lower level of the earth's atmosphere, ozone performs most essential function. The correct statements are
  1. A (a) and (b)
  2. B (a) and (c)
  3. C (b) and (c)
  4. D (b) and (d)
Previously asked in CBSE board exam
2024 31/3/1 Q16
Generated by claude-sonnet-4-6 · 2026-06-15 06:44 · grounding rag
Model Answer

Option B: (a) and (c)

Ozone is a deadly poison (a) ✓, and it is a product of UV radiation acting on oxygen molecules (c) ✓. Ozone shields Earth from UV radiation (not infrared), and it performs its essential function at higher levels of the atmosphere (not lower level).

Explanation

The passage clearly states: "Ozone is a deadly poison" → (a) correct. "Ozone…is a product of UV radiation acting on oxygen (O₂) molecule" → (c) correct. Statement (b) is wrong because ozone shields from UV, not infrared. Statement (d) is wrong because ozone's essential function is at higher atmospheric levels, not lower. Examiners expect students to carefully distinguish UV vs infrared and higher vs lower atmosphere.

Source: Chapter 13, Section 13.2.1

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