Ncert- science – class 7- Chapter 11 – Light 1 Welcome to your Ncert- science – class 7- Chapter 11 – Light 1 1. Which of the following forms a virtual and erect image of same size for all positions of the object? Convex mirror Convex lens Concave mirror Plane mirror None 2. At an instant a watch shows time 3:25. When seen through a mirror, time appeared will be: 9:35 7:35 8:35 8:25 None 3. 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 4. When the Newton's disc is rotated what happens The colours fade to blue The colours fade to white The colours fade to black The colours fade to red None 5. Newton's colour disc was invented by whom? Sir Isaac Newton and Faraday Sir Isaac Newton and John Kennedy Albert Einstein Sir Isaac Newton None 6. A plane mirror produces a magnification of: -1 Zero Between 0 and + 1 +1 None 7. An object of 10cm is placed in front of a plane mirror. The height of image will be ....... . 5cm 10cm 20cm 15cm None 8. What is a virtual image? The image that can be caught on a screen None The image that cannot be converged on a screen The image that cannot be caught on a screen None 9. An ideal mirror: None of the above Reflects all the light Refracts all the light Absorbs all the amount of light incident on it None 10. 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 Polished glass of red colour Smoked glass covered with green colour cloth None 11. Image formed by a plane mirror is : Real at the surface of the mirror and enlarged Virtual, behind 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 12. 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 enlarged Erect and reduced 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. What kind of image is obtained always for concave lens? Virtual, Erect and Diminished Real, Erect and Large All of these Real, Erect and Diminished None 15. 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 16. The silvering on the back surface of a mirror can be done by All kind of shiny materials Silver Mercury None None 17. When is the real image formed? 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 when the rays of light after deflection actually meet at some point 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's distance is less than the image's distance. when the object is on the principal axis of the minor. at all distances, from the mirror. None 19. 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 20. What does Newton's colour disc possess? 5 segments in rainbow colours 9 segments in rainbow colours 4 segments in rainbow colours 7 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.
