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