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