Human Impact on Earth's Processes MCQs
Practice Human Impact on Earth's Processes multiple-choice questions from Earth as a System (Class 9 Science) - tap an answer for instant feedback and a step-by-step solution. Practice the full set free on the RankByte app.
Human Impact on Earth's ProcessesQuiz - Solve & Score
Q1. Which issue is described: 'rise in Earth's temperature due to greenhouse gases'?
- A.Global warming
- B.Acid rain
- C.Deforestation
- D.Greenhouse effect
Answer: A. Global warming
Asked for the unknown; data is laid out in the stem. By the answer = Global warming. CO2, CH4, water vapour and CFCs trap outgoing IR, raising Earth's temperature. So option A) Global warming. Others fail: option B) 'Acid rain' misses the point - Acid rain: rain made acidic by oxides of sulphur and nitrogen; option C) 'Deforestation' misses the point - Deforestation: large-scale cutting of forests.
Q2. Which issue is described: 'thinning of the ozone layer by CFCs'?
- A.Ozone depletion
- B.Deforestation
- C.Greenhouse effect
- D.Air pollution
Answer: A. Ozone depletion
We are told that the numerical data stated in the question (biology, chapter 'Earth as a System'). Our target: the unknown asked. The relevant chapter relation links the data to the unknown - rearrange it to isolate the quantity we are solving for. Ozone (O3) forms in the stratosphere by UV: O2 + UV -> 2 O, then O + O2 -> O3. That lands on option A) Ozone depletion. As for the others, option B) 'Deforestation' is wrong because Deforestation: large-scale cutting of forests; option C) 'Greenhouse effect' is wrong because Greenhouse effect: trapping of heat by atmospheric gases.
Q3. Which issue is described: 'rain made acidic by oxides of sulphur and nitrogen'?
- A.Acid rain
- B.Greenhouse effect
- C.Air pollution
- D.Smog
Answer: A. Acid rain
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