Ncert – class 8- science – Chapter 12: Some Natural Phenomena 1 Welcome to your Ncert - class 8- science - Chapter 12: Some Natural Phenomena 1 1. Two objects when rubbed together, get charged. The charges on them are: Equal and similar Unequal and opposite Equal and opposite Unequal and similar None 2. 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. the plastic strips will diverge one strip will move away while other will remain same. the plastic strips will not diverge None 3. Which of the following is not a natural phenomenon? Lightening Cyclone Earthquake Cooking None 4. Lightning is caused in the atmosphere primarily due to Discharge between one charged and one neutral cloud. Discharge between two similarly charged clouds. None of these Opposite charges accumulation at edges of a cloud. None 5. Like charges repel and unlike charge Repel or attract Attract each other Any thing may happen Repel each other None 6. Why is Earthing done in buildings? To give extra strength to the building None of these To transfer extra current to air To protect us from electric shocks None 7. Which of the following natural phenomenon is most destructive in terms of loss of life and property? Earthquake Storms Lightening winds None 8. The process of transferring a charge from a charged body to the earth is called Electrolysis Earthing Hydrolysis Discharging None 9. 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 10. 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 Major earth quake causes serious damage Causes major damage to poorly constructed buildigs None 11. How does charges separate during a thunderstorm? Due to rubbing of air particles Due to movement of air Due to movement of air current and water droplets None of these None 12. What is the cause for the streaks of bright light and sound produced during lightning? Meeting of unlike electric charges Meeting of positive charges Meeting of negative charges Meeting of like electric charges None 13. What is a positive charge? The charge acquired by silk when it is rubbed with a glass rod None of these The charge acquired by plastic straw when it is rubbed with a silk The charge acquired by a glass rod when it is rubbed with silk None 14. An ebonite rod is rubbed with fur. The charge on the ebonite rod is ______ and the charge on the fur is _______. Negative, Positive Negative, Negative Positive, Negative Positive, Positive None 15. 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 16. During the thunderstorm, ________ move upwards while ________ move downards. Water droplets, air currents Water droplets, charges Air currents, water droplets Air currents, charges None 17. What are the weak zones around the boundaries of plates underneath Earth, which are prone to slide and cause earthquakes? Fault zone Eruption zone Explosive zone Sliding zone None 18. 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 19. Some object can be charged by _________ with other objects. Heating Joining Rubbing Touching None 20. 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) (ii) (iii) (iv) 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.
