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