Ncert – class 8- science – Chapter 12: Some Natural Phenomena 1 Welcome to your Ncert - class 8- science - Chapter 12: Some Natural Phenomena 1 1. How does charges separate during a thunderstorm? Due to movement of air current and water droplets None of these Due to rubbing of air particles Due to movement of air None 2. An ebonite rod is rubbed with fur. The charge on the ebonite rod is ______ and the charge on the fur is _______. Positive, Negative Negative, Positive Negative, Negative Positive, Positive None 3. If the Richter scale reading for an earthquake is less than 3.5 then what can you say about the earthquake? Often felt & rarely causes damage Generally not felt but recorded Causes major damage to poorly constructed buildigs Major earth quake causes serious damage None 4. During the thunderstorm, ________ move upwards while ________ move downards. Air currents, charges Water droplets, air currents Air currents, water droplets Water droplets, charges None 5. What is the cause for the streaks of bright light and sound produced during lightning? Meeting of like electric charges Meeting of positive charges Meeting of unlike electric charges Meeting of negative charges None 6. Why is Earthing done in buildings? To transfer extra current to air To protect us from electric shocks To give extra strength to the building None of these None 7. In an electroscope, if aluminium strips are replaced by plastic strips, and a charged object is touched with the metal top of the electroscope: the plastic strips will come more closer. one strip will move away while other will remain same. the plastic strips will not diverge the plastic strips will diverge None 8. Which of the following is not a natural phenomenon? Cyclone Cooking Earthquake Lightening None 9. What happens when two bodies are rubbed together Nothing happend with rubbing None They get equal charged but the opposite nature They get equal charged but the same nature None 10. What is a positive charge? None of these The charge acquired by plastic straw when it is rubbed with a silk The charge acquired by silk when it is rubbed with a glass rod The charge acquired by a glass rod when it is rubbed with silk None 11. Two objects when rubbed together, get charged. The charges on them are: Equal and opposite Unequal and similar Equal and similar Unequal and opposite None 12. Some object can be charged by _________ with other objects. Rubbing Heating Joining Touching None 13. Following are precautions one must take in case a storm is accompanied by lightning. i) Do not take shelter under a tree. ii) Do not take shelter under an umbrella with a metallic end. iii) Do not take shelter in open garages, storage sheds, etc. iv) Do not take shelter in a bus in the open. Which one of these is not correct? (i) (iv) (iii) (ii) None 14. Like charges repel and unlike charge Repel each other Any thing may happen Repel or attract Attract each other None 15. Lightning is caused in the atmosphere primarily due to None of these Discharge between two similarly charged clouds. Opposite charges accumulation at edges of a cloud. Discharge between one charged and one neutral cloud. None 16. Building can be protected from lightening by using Wooden logs at the top of building Lightening rod at the top of building All of these Lightening rod on the levels of building None 17. When a glass rod is rubbed with dry silk cloth, the charge acquired by the silk cloth is Positive Both positive and negative none of the above Negative None 18. What are the weak zones around the boundaries of plates underneath Earth, which are prone to slide and cause earthquakes? Eruption zone Fault zone Explosive zone Sliding zone None 19. The process of transferring a charge from a charged body to the earth is called Electrolysis Hydrolysis Discharging Earthing None 20. Which of the following natural phenomenon is most destructive in terms of loss of life and property? winds Earthquake Storms Lightening 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.
