Class 9 / Grade 9

1. What is a hydroelectric dam? 2. How does a hydroelectric dam generate electricity? 3. What is the source of energy in a hydroelectric dam? 4. What is the role of a reservoir in a hydroelectric dam? 5. How does the height of the dam affect the electricity generation in a hydroelectric power plant? 6. … Read more

1. What is the digestive system? 2. Name the primary organs of the digestive system. 3. What is the role of the mouth in digestion? 4. What is peristalsis? 5. How does food move from the mouth to the stomach? 6. What role does the stomach play in digestion? 7. What is gastric acid, and … Read more

1. What is climate change? 2. What is the primary driver of current climate change? 3. How do greenhouse gases contribute to climate change? 4. What are the main greenhouse gases responsible for climate change? 5. How does deforestation contribute to climate change? 6. What is the difference between weather and climate? 7. How does … Read more

1. What is the water cycle? 2. What are the main stages of the water cycle? 3. How does evaporation occur in the water cycle? 4. What is condensation in the water cycle? 5. How does precipitation happen in the water cycle? 6. What factors influence the type of precipitation (rain, snow, sleet, hail) in … Read more

1. What is a parallel circuit? 2. How does the current flow in a parallel circuit? 3. What happens to the voltage in a parallel circuit? 4. How are components connected in a parallel circuit? 5. What is the total resistance in a parallel circuit? 6. How does adding resistors affect the total resistance in … Read more

1. What is a series circuit? 2. What happens to the current in a series circuit? 3. How are components connected in a series circuit? 4. What is the total resistance in a series circuit? 5. How does adding resistors affect the total resistance in a series circuit? 6. If one bulb in a series … Read more

1. What is Chandrayaan-3? 2. What is the primary objective of Chandrayaan-3? 3. How is Chandrayaan-3 different from its predecessors? 4. What agency is responsible for Chandrayaan-3? 5. When was Chandrayaan-3 officially announced? 6. What is the anticipated launch date of Chandrayaan-3? 7. What components are expected in Chandrayaan-3’s lander and rover? 8. How does … Read more

1. What is the brain? 2. How much does the human brain weigh? 3. What are the main parts of the brain? 4. What is the function of the cerebrum? 5. What does the cerebellum control? 6. What is the role of the brainstem? 7. How is the brain protected? 8. What is the blood-brain … Read more

1. What is an electric bell? 2. How does an electric bell function? 3. What are the main components of an electric bell? 4. Why is the electromagnet important in an electric bell? 5. How does the armature move in an electric bell? 6. Explain the role of the spring in an electric bell. 7. … Read more

1. What is a hydraulic bridge? 2. How does a hydraulic bridge differ from a traditional fixed bridge? 3. What is the primary purpose of a hydraulic bridge? 4. What are the common types of hydraulic bridges? 5. How does a bascule bridge operate? 6. What is the function of the counterweight in a bascule … Read more

1. What is an earthquake alarm? 2. How does an earthquake alarm work? 3. What is the purpose of an earthquake alarm? 4. Can earthquake alarms prevent earthquakes? 5. How accurate are earthquake alarms? 6. Are earthquake alarms commonly used worldwide? 7. What types of sensors are used in earthquake alarms? 8. How can earthquake … Read more

1. What is air pollution? 2. What are the main sources of air pollution? 3. How is air quality measured? 4. What are the health effects of air pollution on humans? 5. How does air pollution affect the environment? 6. What is smog, and how is it formed? 7. What is the role of particulate … Read more

1. What is an air cooler? 2. How does an air cooler differ from an air conditioner? 3. What are the basic components of an air cooler? 4. Explain the working principle of an air cooler. 5. In which climatic conditions are air coolers most effective? 6. How is an air cooler maintained? 7. Can … Read more

1. What is a rain alarm? 2. How does a rain alarm work? 3. What are the common types of rain sensors used in rain alarms? 4. Why is a rain alarm useful? 5. Can rain alarms be used for agricultural purposes? 6. How can rain alarms contribute to water conservation? 7. Are rain alarms … Read more

1. What is the function of the human eye? 2. What are the main parts of the eye? 3. What is the cornea, and what is its role in vision? 4. What is the function of the iris? 5. What is the pupil, and how does it respond to light? 6. How does the lens … Read more