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