Imp Questions For All Chapters – General Science Class 8
Short Questions
1. What is pollution?
- Pollution is the contamination of air, water, and land, making them harmful for living beings.
2. What are pollutants?
- Pollutants are harmful substances that cause pollution, such as smoke, chemicals, and plastic waste.
3. What are the main types of pollution?
- Air pollution, water pollution, soil pollution, and noise pollution.
4. What causes air pollution?
- Smoke from vehicles, factories, burning of fuels, and deforestation.
5. What are the effects of air pollution?
- Causes breathing problems, lung diseases, acid rain, and ozone layer depletion.
6. What is water pollution?
- When harmful substances mix with water, making it unsafe for drinking and aquatic life.
7. What causes water pollution?
- Dumping sewage, chemicals, plastics, and industrial waste into water bodies.
8. What are the effects of water pollution?
- Causes diseases like cholera, kills aquatic animals, and affects drinking water quality.
9. What is soil pollution?
- When harmful substances like pesticides, plastics, and waste damage the soil’s quality.
10. What are the effects of soil pollution?
- Reduces soil fertility, affects plant growth, and pollutes groundwater.
11. What is acid rain?
- Rain that contains harmful acids due to air pollution from industries and vehicles.
12. What are the effects of acid rain?
- Damages crops, buildings, and harms aquatic life in lakes and rivers.
13. What is the greenhouse effect?
- The trapping of heat in the Earth’s atmosphere by gases like carbon dioxide, causing global warming.
14. What causes global warming?
- Increased pollution, deforestation, burning of fossil fuels, and industrial waste.
15. What is the ozone layer?
- A protective layer in the atmosphere that absorbs harmful ultraviolet (UV) rays from the Sun.
16. What causes ozone layer depletion?
- The release of harmful gases like chlorofluorocarbons (CFCs) from air conditioners and refrigerators.
17. What is noise pollution?
- Unwanted loud sounds from traffic, factories, and loudspeakers that disturb humans and animals.
18. What are the effects of noise pollution?
- Causes hearing problems, stress, sleep disturbance, and high blood pressure.
19. How can we reduce pollution?
- By planting trees, using eco-friendly products, reducing waste, and using public transport.
20. What are renewable sources of energy that cause less pollution?
- Solar energy, wind energy, and hydroelectric power.
Long Questions
1. What are the major types of pollution?
- The major types of pollution are air pollution, water pollution, soil pollution, and noise pollution. Each type affects the environment and human health in different ways.
2. How does air pollution affect human health?
- Air pollution causes breathing problems, lung infections, asthma, and heart diseases. It also irritates the eyes and damages the respiratory system.
3. What are the causes and effects of water pollution?
- Water pollution is caused by sewage, chemicals, plastics, and industrial waste. It harms aquatic animals, spreads diseases, and makes drinking water unsafe.
4. What is global warming and how does it affect the Earth?
- Global warming is the rise in Earth’s temperature due to pollution. It melts glaciers, raises sea levels, and changes weather patterns, leading to natural disasters.
5. What are the causes and effects of acid rain?
- Acid rain is caused by pollution from factories and vehicles. It damages plants, pollutes water bodies, and erodes buildings and monuments.
6. How does the depletion of the ozone layer affect living beings?
- The ozone layer protects us from harmful ultraviolet (UV) rays. Its depletion increases the risk of skin cancer, eye damage, and harms crops and animals.
7. What are the sources of soil pollution?
- Soil pollution is caused by plastics, pesticides, industrial waste, and garbage. It reduces soil fertility, affects plant growth, and contaminates groundwater.
8. How can we reduce pollution in our daily life?
- We can reduce pollution by using bicycles, saving water, planting trees, avoiding plastic, and using renewable energy sources like solar and wind power.
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