Ncert – class 8- science – Chapter 13: Light 1 Welcome to your Ncert - class 8- science - Chapter 13: Light 1 1. Two plane mirrors are at 45º to each other. If an object is placed between them then the number of images will be: 7 8 6 5 None 2. In cataract, the lens of the eye becomes Clear opaque small Large None 3. Band of colours seen emerging from a prism is called: Beam, Spectrum bandwidth wavelength None 4. The image of an object is formed due to the _________ of light rays by the eye lens on the retina. reflection refraction scattering dispersion None 5. Image formation takes place by: Regular reflection Diffused reflection Both A and B None of these None 6. Right angle mirrors produce three images of objects. Which of the following is statements is/ are true of the middle image? The middle image will exhibit left-right reversal relative to the object The middle image is a real image The middle image is the same as the object The middle image is at the same distance from the mirror as the object None 7. Which of the following letter shaped pipe is most effective to build a Periscope ? C A N Z None 8. Which of the following is not true about sunlight? Sunlight has seven constituent colors All of the above Sunlight is white light Sunlight cannot be split with a prism made of water None 9. We can see books even though it does not emit light because It reflects light It absorbs light It is always visible Neither absorbs nor reflects light None 10. Two plane mirrors are placed at some angle. There are five images formed, when an object is placed symmetrically between them, the angle between the mirrors is: 60º 65º 45º 30º None 11. Two mirrors are kept at 60 to each other and a body is placed at middle. Total number of images formed is Three Five Four six None 12. Suppose you are in a dark room with a small window through which a faint light is getting in. Which of the following statements is true? you can only see object outside the room but not the objects inside the room you can see the objects inside the room and objects outside the room you can only see object inside the room but not the objects outside the room you cannot see any objects while inside the room None 13. Which of the following is not an example of dispersion of light? Rainbow Colorful display of LED television screen Colors appearing on the surface of CDs Colors appearing on the surface of a soap bubble None 14. In which of the following conditions diffuse reflection takes place? When a parallel beam of light is reflected by a highly polished metal surface. All of these When a parallel beam of light is reflected by a paper sheet. When a parallel beam of light is reflected by a plane mirror. None 15. Diffused reflection must produce image may produce image None of these never produce image None 16. The instrument that can be used to see things from a concealed position Telescope Periscope Kaleidoscope Microscope None 17. Two plane mirrors at an angle (x)º produces 5 images of a point. The number of images produced is (x)º decreased to is(x-30)º 10 9 11 12 None 18. Mark correct option. The size of virtual image can be measured by receiving it on screen Plane mirror may form inverted image Plane mirror alongs form an erect image The laws of reflection of light hold only for plane surfaces None 19. If you read the words of your book, the reflection is may be specular may be diffused None of these specular reflection diffused reflection None 20. Retina of eye acts like ______ of camera. Lens Film Shutter 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.
