Imp Questions For All Chapters – General Science Class 7
Natural Resources
Short Questions
1. What are natural resources?
→ Natural resources are materials from nature like water, minerals, forests, and fossil fuels that humans use.
2. What are fossil fuels?
→ Fossil fuels are energy-rich substances like coal, oil, and natural gas formed from dead plants and animals over millions of years.
3. Give two examples of metallic minerals.
→ Iron (Fe) and Copper (Cu).
4. What are non-metallic minerals?
→ Non-metallic minerals are minerals that do not contain metals, like mica, gypsum, and limestone.
5. Why is coal an important resource?
→ Coal is used for electricity generation, heating, and making steel.
6. What is petroleum used for?
→ Petroleum is used to make petrol, diesel, kerosene, LPG, and plastics.
7. What are renewable resources?
→ Renewable resources are resources that can be replaced naturally, like sunlight, wind, and forests.
8. What are non-renewable resources?
→ Non-renewable resources cannot be replaced quickly and may run out, like coal, oil, and natural gas.
9. Why are forests important?
→ Forests provide wood, oxygen, medicines, food, and prevent soil erosion.
10. Give two examples of ocean resources.
→ Fish and petroleum.
11. What is the main component of cement?
→ Limestone (Calcium Carbonate – CaCO₃).
12. What is deforestation?
→ Cutting down of large numbers of trees, leading to loss of biodiversity and soil erosion.
13. What is the main use of gypsum?
→ Gypsum is used to make Plaster of Paris (POP) and cement.
14. Why is conservation of natural resources important?
→ To ensure future generations have enough resources and to protect the environment.
15. What is biodiversity?
→ Biodiversity means the variety of plants and animals in an ecosystem.
Long Questions
1. Why should we use fuels carefully?
→ Fuels like petrol and diesel are limited, and their overuse causes air pollution and climate change. Conserving fuel helps protect the environment.
2. How do forests help in maintaining ecological balance?
→ Forests provide oxygen, absorb carbon dioxide, prevent floods, and protect wildlife. Cutting forests disturbs rainfall and biodiversity.
3. What are the effects of deforestation?
→ Deforestation leads to loss of habitat, climate change, soil erosion, and less oxygen production, affecting both humans and animals.
4. How is sea salt obtained from ocean water?
→ Seawater is stored in shallow ponds and allowed to evaporate under the sun, leaving behind crystals of salt.
5. Why are minerals important to humans?
→ Minerals like iron, copper, and aluminium are used in making tools, machinery, electrical wires, and buildings.
6. What is the difference between renewable and non-renewable resources?
→ Renewable resources (like wind and sunlight) can be replaced, but non-renewable resources (like coal and petroleum) take millions of years to form.
7. How can we conserve water resources?
→ We can save water by rainwater harvesting, fixing leaks, reusing water, and avoiding wastage in daily activities.
8. What happens if we keep using fossil fuels without control?
→ Fossil fuels will run out, causing energy shortages, and their excessive use will increase pollution and global warming.
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