Ncert- science – class 7- Chapter 11 – Light 1 Welcome to your Ncert- science – class 7- Chapter 11 – Light 1 1. An object of 10cm is placed in front of a plane mirror. The height of image will be ....... . 15cm 5cm 20cm 10cm None 2. Newton's colour disc was invented by whom? Sir Isaac Newton Albert Einstein Sir Isaac Newton and Faraday Sir Isaac Newton and John Kennedy None 3. An ideal mirror: Refracts all the light Absorbs all the amount of light incident on it None of the above Reflects all the light None 4. Which of the following forms a virtual and erect image of same size for all positions of the object? Convex mirror Convex lens Plane mirror Concave mirror None 5. Which statement is wrong from the following for the reflection by plane mirror? The size of image is same as size of object Object distance and image distance is same A plane mirror forms virtual and erect image Image of the object in not laterally inverted None 6. What kind of image is obtained always for concave lens? All of these Virtual, Erect and Diminished Real, Erect and Diminished Real, Erect and Large None 7. Riya and Priya were sitting around a round table. They noticed that they could see their own and each other's image onto the table top. Then table top is made of Polished glass of red colour Smoked glass covered with green colour cloth Glass covered with cellophane paper Unpolished wood, covered with white cloth None 8. When is the real image formed? when the rays of light after deflection actually meet at some point when the sun rays after reflection or refraction actually meet at some point when the rays of light after reflection or refraction actually go away from some point when the rays of light after reflection or refraction actually meet at some point None 9. The silvering on the back surface of a mirror can be done by None All kind of shiny materials Silver Mercury None 10. Image formed by a plane mirror is : Virtual, behind the mirror and enlarged Virtual, behind the mirror and of the same size as the object Real at the surface of the mirror and enlarged Real, behind the mirror and of the same size as the object None 11. What will be the condition of image when you stand in front of a plane flat mirror and look at yourself and you raise your right hand? Inverted and reversed Erect and enlarged Erect and reduced Erect and reversed None 12. When the Newton's disc is rotated what happens The colours fade to white The colours fade to red The colours fade to blue The colours fade to black None 13. The phenomenon by which the incident light falling on a surface is sent back into the same medium is known as ___________. None Reflection Refraction Dispersion None 14. Complete the following statement. A plane mirror will produce a virtual image: when the object is on the principal axis of the minor. when the object's distance is greater than the image's distance. when the object's distance is less than the image's distance. at all distances, from the mirror. None 15. A plane mirror reflects, a pencil of light to form a real image. Then the pencil of light incident on the mirror is None of these Divergent Convergent Parallel None 16. At an instant a watch shows time 3:25. When seen through a mirror, time appeared will be: 8:35 7:35 9:35 8:25 None 17. What is a virtual image? The image that cannot be converged on a screen The image that can be caught on a screen The image that cannot be caught on a screen None None 18. A plane mirror produces a magnification of: +1 -1 Between 0 and + 1 Zero None 19. When the distance between the object and the plane mirror increases. The distance between the image and the plane mirror increases The distance between the image and the plane mirror decreases The image remains same The size of the image will become less than the size of the object None 20. What does Newton's colour disc possess? 5 segments in rainbow colours 7 segments in rainbow colours 9 segments in rainbow colours 4 segments in rainbow colours 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.
