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