Ozone Layer and Its DepletionPractice Questions & MCQs
Practice Ozone Layer and Its Depletion questions from Our Environment (Class 10 Science) - important MCQs with answers and step-by-step solutions. Solve the sample questions below, then practice the full set free on the RankByte app.
Ozone Layer and Its DepletionQuiz - Solve & Score
Q1. Which everyday change helps protect the ozone layer?
- A.using more aerosol cans with CFCs
- B.burning more fossil fuels
- C.using CFC-free refrigerators and sprays
- D.releasing old AC gas to air
Answer: C. using CFC-free refrigerators and sprays
Q2. Consider the following statements about the ozone layer: (I) Ozone absorbs harmful UV radiation. (II) CFCs deplete the ozone layer. (III) Ozone is found in the Earth's core. Which of the above statement(s) is/are correct?
- A.None of these
- B.Only I and II
- C.Only I
- D.Only III
Answer: B. Only I and II
NCERT fact (biology, chapter 'Our Environment'): Extraction sequence: concentration of ore -> roasting / calcination -> reduction (C, Al thermite, or electrolysis) -> refining; pick the step / agent suited to the metal's position in the reactivity series; substituting the named metal here => the listed match emerges; hence the answer = Only I and II. Why option B fits - Correct. Distractor analysis: option A) 'None of these' misses the point - Re-check each statement individually; option C) 'Only I' is wrong because Re-check each statement individually. Final answer - B) Only I and II.
Q3. A student looking at a model of the atmosphere asks at which layer the protective ozone shield is concentrated; what is the correct answer?
- A.In the mesosphere above the stratosphere
- B.At the Earth's surface only
- C.In the troposphere near the ground
- D.In the stratosphere
Answer: D. In the stratosphere
The protective ozone layer is concentrated in the stratosphere, the second atmospheric layer, roughly 15-35 km above the ground.
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