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