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