Ncert – class 8- science – Chapter 12: Some Natural Phenomena 1 Welcome to your Ncert - class 8- science - Chapter 12: Some Natural Phenomena 1 1. 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 Negative, Positive Positive, Negative None 2. Like charges repel and unlike charge Any thing may happen Attract each other Repel each other Repel or attract None 3. Building can be protected from lightening by using Lightening rod on the levels of building Lightening rod at the top of building All of these Wooden logs at the top of building None 4. Two objects when rubbed together, get charged. The charges on them are: Equal and similar Equal and opposite Unequal and similar Unequal and opposite None 5. When a glass rod is rubbed with dry silk cloth, the charge acquired by the silk cloth is Positive Negative none of the above Both positive and negative None 6. Why is Earthing done in buildings? To protect us from electric shocks None of these To give extra strength to the building To transfer extra current to air 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? Earthquake Cyclone Lightening Cooking None 9. Which of the following natural phenomenon is most destructive in terms of loss of life and property? Lightening Storms Earthquake winds None 10. The process of transferring a charge from a charged body to the earth is called Discharging Hydrolysis Earthing Electrolysis None 11. What are the weak zones around the boundaries of plates underneath Earth, which are prone to slide and cause earthquakes? Fault zone Explosive zone Eruption zone Sliding zone None 12. 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) (i) (iv) None 13. During the thunderstorm, ________ move upwards while ________ move downards. Water droplets, charges Air currents, water droplets Water droplets, air currents Air currents, charges None 14. What is a positive charge? The charge acquired by silk when it is rubbed with a glass rod 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 of these None 15. What is the cause for the streaks of bright light and sound produced during lightning? Meeting of like electric charges Meeting of unlike electric charges Meeting of negative charges Meeting of positive charges None 16. If the Richter scale reading for an earthquake is less than 3.5 then what can you say about the earthquake? Major earth quake causes serious damage Generally not felt but recorded Causes major damage to poorly constructed buildigs Often felt & rarely causes damage None 17. Some object can be charged by _________ with other objects. Heating Joining Rubbing Touching None 18. 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 19. How does charges separate during a thunderstorm? None of these Due to movement of air current and water droplets Due to movement of air Due to rubbing of air particles None 20. Lightning is caused in the atmosphere primarily due to Opposite charges accumulation at edges of a cloud. Discharge between two similarly charged clouds. Discharge between one charged and one neutral cloud. None of these 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.
