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