Ncert – class 8- science – Chapter 12: Some Natural Phenomena 2 Welcome to your Ncert - class 8- science - Chapter 12: Some Natural Phenomena 2 1. Why are lightning conductors pointed in shape? To reduce mass. It repels the incident lightning discharge. It allows more current. It attracts more electric charge due to very small radius and hence small surface area. None 2. What kind of material should be used in an earthquake prone area? conducting material heavy weight any of the above light weight None 3. Which of the following one must do when caught in a Thunderstorm? Take shelter under an umbrella with a metallic end Take shelter inside an isolated tree Sit near a window Take shelter in a safe place like car or bus None 4. The lightning conductor used in building, protects the building by: Dissipating the electric charge away from the building Absorbing the electric charge Conducting the lightning safely to the ground None of these None 5. The sparks caused due to friction between two machine parts are: similar to lighting none of the above lightning on a very small scale not similar to lightning None 6. A lightning conductor consists of several sharp metal spiked connected to a thick copper strip. all of the above a conductor fixed on top of the building. a metal plate buried deep inside the ground connected to the ground end of copper strip. None 7. What happens when you touch the water pipeline in the building during a thunderstorm? All of the above Your body provides earthing Charges will pass through your body Your body will conduct electricity None 8. Clouds get electrically charged when : The UV rays of sun falls on them Both Air molecules rub against water molecules and Cold currents of air rub against hot currents of air Air molecules rub against water molecules Cold currents of air rub against hot currents of air None 9. Other than lightning conductor, what are the objects which indirectly protect building from lightning / thunderstorm? Electrical wires in the building. All of the above. Water pipe in the building. Metal column used during construction. None 10. 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. Run to their houses Stand under a tree Just stand at their places Squat down None 11. __________ 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 12. 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 of the car and take cover under the car Remain in the car Run to a nearby tree Get out and stand under an electric pole None 13. Lightning is a more common phenomenon during rainy season because of: high atmospheric density moderate temperature solar electrostatic disturbances high humidity None 14. Why shouldn't one stand under a tree or a tall building during a thunderstorm? None of the above, Lightning can strike trees and buildings, Trees and buildings may fall causing damage, Trees and buildings do not offer enough escape ground, None 15. 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. the balloon will burst. both balloon and tumbler attract each other. no reaction will be observed. 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.
