Ncert – class 8- science – Chapter 13: Light 2 Welcome to your Ncert - class 8- science - Chapter 13: Light 2 1. Which of the following scientists did the pioneering work to understand the splitting of white light in different components? Thomas Edison Albert Einstein Issac Newton Archimedes None 2. A man stands symmetrically between two large plane mirrors fixed to two adjacent walls of a rectangular room. The number of images formed are 3 2 4 6 None 3. The human eye can focus objects at different distances by adjusting the focal length of the eye lens. This is due to far-sightedness near-sightedness presbyopia accomodation None 4. White light can be separated into its components because Each ray of color is deviated by the prism by a different amount. None of these Few rays of color are deviated by the prism by the same amount and others by a different amount. Each ray of color is deviated by the prism by the same amount. None 5. Which of the following does not lie in the plane of reflection ? Reflecting surface Reflected ray Incident ray Normal at the point of incidence None 6. Periscope is built on the concept of scattering of light reflection of light dispersion of light refraction of light None 7. How are things visible to us? Light from the object gets reflected and makes the object visible. Light gets reflected from our eyes and makes the object visible. The reason is still not known. Both A and B can occur according to the light condition None 8. Which surfaces will reflects most of the light falling on them? Rough surface Shiny surface Opaque surface Flat surface None 9. Which of the following is correct regarding reflection. Reflection is a phenomenon by which light incident on a surface is scattered 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 passes into another medium None 10. 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 velocity of the light ray changes The frequency of the light ray changes The direction of motion of the light ray changes The wavelength of the light ray changes None 11. Choose the correct option regarding luminous objects None of the above Objects which is not source of light is luminous objects All objects which glow are luminous objects Objects which glow can be luminous objects None 12. 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 Resonance Polarization Regular reflection None 13. Mark the incorrect statement: Things are only visible when light from our eyes reaches the object. All are true. Light travels along a straight line. Mirror changes the direction of light falling on it None 14. Choose the correct option Moon is a luminous object because it glows Moon is a luminous object because it is a source of light Sun is a luminous object because it is a source of light Sun is not a luminous object None 15. In a periscope, the reflecting mirrors will be: At an angle of 60o Perpendicular to each other At an angle of 30 o Parallel to each other 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.
