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