Ncert – class 10- science -Chapter 10 – The Human Eye and The Colourful World 2 Welcome to your Ncert – class 10- science -Chapter 10 – The Human Eye and The Colourful World 2 1. A ray of light containing both red and blue colours is incident on the refracting surface of a prism. Then, deviation depends on the angle of prism red colour suffers less deviation both colours suffer equal deviation red colour suffers more deviation None 2. A person can not see the distant objects clearly (though he can see the nearby object clearly). He is suffering from the defect of vision called: myopia cataract hypermetropia presbyopia None 3. To remove myopia (short-sightedness) a lens of power −0.66D is required. The distant point of the eye is approximate. 50 cm 151.5 cm 100 cm 25 cm None 4. A person suffering from short-sightedness can see clearly only upto a distance of 2 metres. Find the power of the lens required to correct his vision +1.5 D -1.5 D -0.5 D +2.5 D None 5. A man wearing glasses of focal length + 1m cannot clearly see beyond 1 m if his vision is normal in each of these cases. if he is farsighted if he is nearsighted None 6. The phenomenon of splitting of sunlight by a prism is called_________ and the color that deviates most is ______ Reflection,violet Refraction,Red Scattering,Yellow Dispersion,violet None 7. The principle section of a glass prism is isosceles triangle ABC with AB=AC, the face AC is silvered. A ray of light is incident normally on the face AB and after two reflections, it emerges from the base BC perpendicular to the base. Angle of BAC of the prism is 72º 18º 30º 36º None 8. A person is suffering from myopic defect. He is able to see clear objects placed at 15 cm. What type and of what focal length of lens he should use to see clearly the objects placed 60 cm away Convex lens of 12 cm focal length Concave lens of 20 cm focal length Concave lens of 12 cm focal length Convex lens of 20 cm focal length None 9. If the power of an eye lens increases, then the defect of vision so produced is known as Short sightedness Colour blindness None of the above Long sightedness None 10. What is the common phenomena of light between random wavering of flickering of objects seen through a turbulent stream of hot air, advance sunrise and delayed sunset and twinkling of stars? Reflection Refraction Scattering Atmospheric refraction None 11. A young man has to hold a book at arm's length to be able to read it clearly. The defect of vision is: presbyopia myopia hypermetropia astigmatism None 12. Though a woman can see the distant objects clearly, she cannot see the nearby object clearly. She is suffering from the defect called : Short-sight Mid-sight Hind-sight Long-sight None 13. A person cannot see object clearly that are closed that 2m and father than 4m . To correct the eye vision the person will use : Bifocal lenses of power 0.25D and 3.5D Bifocal lenses of power 0.5D and 4.0D Bifocal lenses of power 0.5D and 0.25D Bifocal lenses of power 4.0D and 0.5D None 14. A far-sighted person cannot focus distinctly objects closer than 120 cm. The lens that will permit him to read from a distance of 40 cm will have a focal length: + 30 cm - 30 cm - 60 cm + 60 cm None 15. A person can see clearly objects only when they lie between 50cm and 400cm from his eyes. In order to increase the maximum distance of distinct vision to infinity, the type and power of the correcting lens, the person has to use, will be? Concave, −0.25 dioptre Convex, + 2.25 dioptre Concave, −0.2 dioptre Convex, +0.15 dioptre None 16. Which of the following statements is correct concerning the passage of white light into a glass prism? All the colours of white light travel with the same speed Greater the wavelength, slower the speed of colour The violet colour travels faster than the red colour The violet colour travels slower than the red colour None 17. A student of class 10, is not able to see clearly the black board question when seated at a distance of 5 m from the board,the defect he is suffering from is Hypermetropia Astigmatism Myopia Presbyopia None 18. A man wearing glasses of power +2D, can read clearly a book placed at a distance of 40 cm, from the eye. The power of the lens required, so that he can read at 25 cm from the eye is ? +3.5 D +4.5 D +4.0 D +3.0 D None 19. An old person is able to see an object nearest to 1 m.What should be the power of lens required so that he can see an object placed at nearest distance of distinct vision? 3D 1/4D 4D 1/2D None 20. A person cannot see distant objects clearly. his vision can be corrected by using the spectacle containing : contact lenses convex lenses plane lenses concave lenses 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.
