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: Conducting the lightning safely to the ground Dissipating the electric charge away from the building Absorbing the electric charge None of these None 2. Lightning is a more common phenomenon during rainy season because of: moderate temperature high atmospheric density solar electrostatic disturbances high humidity None 3. __________ is engineered to protect an elevated structure in the event of lightning strike. Copper wire A lightning conductor All of the above A lightening shield None 4. 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 5. 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 6. 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 7. A lightning conductor consists of a conductor fixed on top of the building. several sharp metal spiked connected to a thick copper strip. all of the above a metal plate buried deep inside the ground connected to the ground end of copper strip. None 8. Which of the following one must do when caught in a Thunderstorm? Take shelter in a safe place like car or bus Take shelter inside an isolated tree Sit near a window Take shelter under an umbrella with a metallic end None 9. Clouds get electrically charged when : Cold currents of air rub against hot currents of air Air molecules rub against water molecules 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 None 10. What kind of material should be used in an earthquake prone area? light weight any of the above heavy weight conducting material None 11. What happens when you touch the water pipeline in the building during a thunderstorm? Your body will conduct electricity Your body provides earthing All of the above Charges will pass through your body None 12. 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. both balloon and tumbler will repel each other. no reaction will be observed. None 13. Other than lightning conductor, what are the objects which indirectly protect building from lightning / thunderstorm? Electrical wires in the building. Metal column used during construction. Water pipe in the building. All of the above. None 14. Why are lightning conductors pointed in shape? It repels the incident lightning discharge. To reduce mass. It allows more current. It attracts more electric charge due to very small radius and hence small surface area. None 15. 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 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.
