Chapter 16: Environment and Us – Important MCQs
1. The major cause of environmental pollution is:
A. Natural calamities
B. Human activities
C. Forests
D. Wildlife
✔️ Answer: B. Human activities
2. Which of the following gases is a greenhouse gas?
A. Nitrogen
B. Oxygen
C. Carbon dioxide
D. Hydrogen
✔️ Answer: C. Carbon dioxide
3. Which is the main cause of global warming?
A. Deforestation
B. Soil erosion
C. Water pollution
D. Acid rain
✔️ Answer: A. Deforestation
4. The depletion of the ozone layer is mainly due to:
A. CO₂
B. CFCs (chlorofluorocarbons)
C. NO₂
D. CH₄
✔️ Answer: B. CFCs (chlorofluorocarbons)
5. Which of these is a biodegradable waste?
A. Plastic
B. Glass
C. Vegetable peel
D. Metal
✔️ Answer: C. Vegetable peel
