Ncert – class 8- science – Chapter 13: Light 2 Welcome to your Ncert - class 8- science - Chapter 13: Light 2 1. Periscope is built on the concept of refraction of light scattering of light dispersion of light reflection of light None 2. When a light ray falls on a perfectly reflective mirror at an angle. Identify which of the following statement is true about the ray? The direction of motion of the light ray changes The velocity of the light ray changes The wavelength of the light ray changes The frequency of the light ray changes None 3. Which of the following does not lie in the plane of reflection ? Incident ray Reflected ray Normal at the point of incidence Reflecting surface None 4. In a periscope, the reflecting mirrors will be: Perpendicular to each other Parallel to each other At an angle of 30 o At an angle of 60o None 5. The human eye can focus objects at different distances by adjusting the focal length of the eye lens. This is due to presbyopia accomodation far-sightedness near-sightedness None 6. How are things visible to us? Light from the object gets reflected and makes the object visible. The reason is still not known. Both A and B can occur according to the light condition Light gets reflected from our eyes and makes the object visible. None 7. Choose the correct option Sun is a luminous object because it is a source of light Moon is a luminous object because it is a source of light Sun is not a luminous object Moon is a luminous object because it glows None 8. When a student looks into a plane mirror, she sees a virtual image of herself. However, when she looks into a sheet of paper, no such image forms. Which light phenomenon occurs at the surface of the paper? Diffuse reflection Polarization Regular reflection Resonance None 9. Which of the following is correct regarding reflection. Reflection is a phenomenon by which light incident on a surface is sent back into the same medium Reflection is a phenomenon by which light incident on a surface is absorbed by the surface Reflection is a phenomenon by which light incident on a surface is scattered Reflection is a phenomenon by which light incident on a surface passes into another medium None 10. A man stands symmetrically between two large plane mirrors fixed to two adjacent walls of a rectangular room. The number of images formed are 6 3 4 2 None 11. Mark the incorrect statement: All are true. Light travels along a straight line. Mirror changes the direction of light falling on it Things are only visible when light from our eyes reaches the object. None 12. Which surfaces will reflects most of the light falling on them? Flat surface Shiny surface Rough surface Opaque surface None 13. White light can be separated into its components because Each ray of color is deviated by the prism by a different amount. Each ray of color is deviated by the prism by the same amount. None of these Few rays of color are deviated by the prism by the same amount and others by a different amount. None 14. Choose the correct option regarding luminous objects Objects which glow can be luminous objects None of the above All objects which glow are luminous objects Objects which is not source of light is luminous objects None 15. Which of the following scientists did the pioneering work to understand the splitting of white light in different components? Issac Newton Thomas Edison Archimedes Albert Einstein 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.
