Class 8 Science Sample Test

Cheatsheet Content

### Sample Question Paper 1: Some Natural Phenomena (40 Marks) **Instructions:** * Attempt all questions. * Marks are indicated against each question. **Section A: Multiple Choice Questions (10 Marks)** 1. Which of the following is NOT a natural phenomenon? (1 Mark) a) Earthquake b) Lightning c) Tsunami d) Building construction 2. The instrument used to measure the magnitude of an earthquake is: (1 Mark) a) Barometer b) Seismograph c) Anemometer d) Thermometer 3. The process of charging an object by touching it with another charged object is called: (1 Mark) a) Induction b) Conduction c) Radiation d) Convection 4. Which zone of the Earth is most prone to earthquakes? (1 Mark) a) Deserts b) Plate boundaries c) Mountain peaks d) Oceans 5. Lightning occurs due to: (1 Mark) a) Friction between water droplets b) Accumulation of charges in clouds c) Volcanic eruptions d) High air pressure 6. A device used to protect tall buildings from lightning strikes is a: (1 Mark) a) Lightning rod b) Electric fuse c) Circuit breaker d) Earthing wire 7. The Richter scale measures the: (1 Mark) a) Intensity of light b) Magnitude of an earthquake c) Speed of wind d) Amount of rainfall 8. Which of these is a measure to reduce the impact of an earthquake? (1 Mark) a) Building multi-storeyed structures b) Using non-flexible materials in construction c) Making earthquake-resistant buildings d) Living in coastal areas 9. The sudden shaking of the Earth's surface is known as: (1 Mark) a) Thunderstorm b) Cyclone c) Earthquake d) Flood 10. What happens when two charged objects of the same charge are brought near each other? (1 Mark) a) They attract b) They repel c) They stick together d) No interaction **Section B: Short Answer Questions (15 Marks)** 11. What is an earthquake? Name the scale used to measure its magnitude. (3 Marks) 12. Explain the phenomenon of lightning. How can we protect ourselves from it? (3 Marks) 13. Differentiate between charging by conduction and charging by induction. (3 Marks) 14. What are seismic zones? Why are they important to identify? (3 Marks) 15. Describe three safety measures you would take if an earthquake occurs while you are at home. (3 Marks) **Section C: Long Answer Questions (15 Marks)** 16. With the help of a diagram, explain how a lightning conductor protects a building from lightning. (5 Marks) 17. What are the causes of earthquakes? Discuss the structure of the Earth's crust in relation to earthquakes. (5 Marks) 18. Explain the process of charge transfer in electroscope with a neat labelled diagram. (5 Marks) ### Sample Question Paper 2: Pollution of Air and Water (40 Marks) **Instructions:** * Attempt all questions. * Marks are indicated against each question. **Section A: Multiple Choice Questions (10 Marks)** 1. Which of the following is a major greenhouse gas? (1 Mark) a) Oxygen b) Nitrogen c) Carbon dioxide d) Hydrogen 2. The presence of unwanted and harmful substances in the air is called: (1 Mark) a) Water pollution b) Soil pollution c) Air pollution d) Noise pollution 3. Acid rain is mainly caused by the emissions of: (1 Mark) a) Carbon monoxide and methane b) Sulphur dioxide and nitrogen oxides c) Oxygen and hydrogen d) Carbon dioxide and water vapor 4. Which of these is a common water pollutant? (1 Mark) a) Sand b) Dissolved oxygen c) Industrial effluents d) Nitrogen gas 5. The 'Taj Mahal' is being affected by: (1 Mark) a) Global warming b) Acid rain c) Earthquakes d) Tsunami 6. Potable water is water that is: (1 Mark) a) Safe for bathing b) Safe for washing clothes c) Safe for drinking d) Safe for irrigation 7. Which of the following is NOT a method to conserve water? (1 Mark) a) Rainwater harvesting b) Deforestation c) Reducing water wastage d) Reusing water 8. The phenomenon responsible for the warming of the Earth's atmosphere is: (1 Mark) a) Ozone depletion b) Acid rain c) Greenhouse effect d) Photosynthesis 9. Chlorofluorocarbons (CFCs) are responsible for: (1 Mark) a) Global warming b) Acid rain c) Ozone layer depletion d) Water pollution 10. Which of these diseases is caused by drinking contaminated water? (1 Mark) a) Malaria b) Cholera c) Tuberculosis d) Common cold **Section B: Short Answer Questions (15 Marks)** 11. What is air pollution? List any two sources of air pollution. (3 Marks) 12. Explain the greenhouse effect. Why is it important for life on Earth, but also a concern? (3 Marks) 13. What is acid rain? How does it affect buildings and monuments? (3 Marks) 14. What is potable water? Mention two ways to make water safe for drinking at home. (3 Marks) 15. List three measures that can be taken to reduce water pollution. (3 Marks) **Section C: Long Answer Questions (15 Marks)** 16. Describe the causes and effects of global warming. What steps can be taken to control it? (5 Marks) 17. Explain how the quality of air is deteriorating due to human activities. Discuss the role of vehicles and industries. (5 Marks) 18. What are the different ways in which water gets polluted? Suggest some methods to prevent water pollution. (5 Marks)