Ncert – class 8- science – Chapter 12: Some Natural Phenomena 2 Welcome to your Ncert - class 8- science - Chapter 12: Some Natural Phenomena 2 1. A lightning conductor consists of 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. all of the above a conductor fixed on top of the building. None 2. Other than lightning conductor, what are the objects which indirectly protect building from lightning / thunderstorm? Metal column used during construction. All of the above. Electrical wires in the building. Water pipe in the building. None 3. Why are lightning conductors pointed in shape? It allows more current. To reduce mass. It attracts more electric charge due to very small radius and hence small surface area. It repels the incident lightning discharge. None 4. 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, None of the above, Trees and buildings do not offer enough escape ground, None 5. What kind of material should be used in an earthquake prone area? light weight any of the above conducting material heavy weight None 6. The lightning conductor used in building, protects the building by: None of these Absorbing the electric charge Dissipating the electric charge away from the building Conducting the lightning safely to the ground None 7. Clouds get electrically charged when : Air molecules rub against water molecules The UV rays of sun falls on them Cold currents of air rub against hot currents of air Both Air molecules rub against water molecules and Cold currents of air rub against hot currents of air None 8. 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 9. 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? Remain in the car Get out of the car and take cover under the car Run to a nearby tree Get out and stand under an electric pole None 10. Rub a glass tumbler with wool. Bring an inflated charged balloon, rubbed with wool, near refill. Then both balloon and tumbler will repel each other. both balloon and tumbler attract each other. the balloon will burst. no reaction will be observed. 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. What happens when you touch the water pipeline in the building during a thunderstorm? Your body will conduct electricity All of the above Charges will pass through your body Your body provides earthing None 13. The sparks caused due to friction between two machine parts are: none of the above lightning on a very small scale similar to lighting not similar to lightning None 14. __________ is engineered to protect an elevated structure in the event of lightning strike. A lightening shield All of the above Copper wire A lightning conductor None 15. Lightning is a more common phenomenon during rainy season because of: solar electrostatic disturbances high humidity high atmospheric density moderate temperature 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.
