Ncert – class 8- science – Chapter 12: Some Natural Phenomena 2 Welcome to your Ncert - class 8- science - Chapter 12: Some Natural Phenomena 2 1. The lightning conductor used in building, protects the building by: None of these Conducting the lightning safely to the ground Dissipating the electric charge away from the building Absorbing the electric charge None 2. Why are lightning conductors pointed in shape? It attracts more electric charge due to very small radius and hence small surface area. To reduce mass. It allows more current. It repels the incident lightning discharge. None 3. What happens when you touch the water pipeline in the building during a thunderstorm? All of the above Charges will pass through your body Your body provides earthing Your body will conduct electricity None 4. __________ is engineered to protect an elevated structure in the event of lightning strike. Copper wire A lightening shield A lightning conductor All of the above None 5. Clouds get electrically charged when : Both Air molecules rub against water molecules and Cold currents of air rub against hot currents of air Air molecules rub against water molecules The UV rays of sun falls on them Cold currents of air rub against hot currents of air None 6. Which of the following one must do when caught in a Thunderstorm? Sit near a window Take shelter inside an isolated tree Take shelter in a safe place like car or bus Take shelter under an umbrella with a metallic end None 7. Suppose you are in a car and it is raining heavily with thunderstorms. Then what is the best way to protect yourself from a possible lightning strike? Get out and stand under an electric pole Get out of the car and take cover under the car Remain in the car Run to a nearby tree None 8. Lightning is a more common phenomenon during rainy season because of: high humidity solar electrostatic disturbances moderate temperature high atmospheric density None 9. Why shouldn't one stand under a tree or a tall building during a thunderstorm? Lightning can strike trees and buildings, Trees and buildings may fall causing damage, Trees and buildings do not offer enough escape ground, None of the above, None 10. Rub a glass tumbler with wool. Bring an inflated charged balloon, rubbed with wool, near refill. Then the balloon will burst. both balloon and tumbler attract each other. no reaction will be observed. both balloon and tumbler will repel each other. None 11. Explore and answer :Some children are playing in the playground. Suddenly clouds gather in the sky and there is thunder and lightning. What should they do now?The children should_______.Choose the correct answer. Stand under a tree Just stand at their places Run to their houses Squat down None 12. A lightning conductor consists of all of the above a metal plate buried deep inside the ground connected to the ground end of copper strip. several sharp metal spiked connected to a thick copper strip. a conductor fixed on top of the building. None 13. The sparks caused due to friction between two machine parts are: not similar to lightning similar to lighting lightning on a very small scale none of the above None 14. Other than lightning conductor, what are the objects which indirectly protect building from lightning / thunderstorm? All of the above. Water pipe in the building. Electrical wires in the building. Metal column used during construction. None 15. What kind of material should be used in an earthquake prone area? light weight heavy weight conducting material any of the above None Time's up Please Share This Share this content Opens in a new window Opens in a new window Opens in a new window Opens in a new window Opens in a new window Opens in a new window Opens in a new window Opens in a new window Opens in a new window Opens in a new window Leave a Reply Cancel replyCommentEnter your name or username to commentEnter your email address to commentEnter your website URL (optional) Save my name, email, and website in this browser for the next time I comment.
