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. Though a woman can see the distant objects clearly, she cannot see the nearby object clearly. She is suffering from the defect called : Hind-sight Mid-sight Short-sight Long-sight None 2. 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 -0.5 D +1.5 D +2.5 D None 3. If the power of an eye lens increases, then the defect of vision so produced is known as None of the above Long sightedness Colour blindness Short sightedness None 4. A man wearing glasses of focal length + 1m cannot clearly see beyond 1 m in each of these cases. if he is farsighted if his vision is normal if he is nearsighted None 5. 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 0.25D Bifocal lenses of power 0.5D and 4.0D Bifocal lenses of power 4.0D and 0.5D None 6. 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 Myopia Astigmatism Hypermetropia Presbyopia None 7. To remove myopia (short-sightedness) a lens of power −0.66D is required. The distant point of the eye is approximate. 50 cm 25 cm 151.5 cm 100 cm None 8. 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, −0.2 dioptre Convex, +0.15 dioptre Concave, −0.25 dioptre Convex, + 2.25 dioptre None 9. Which of the following statements is correct concerning the passage of white light into a glass prism? Greater the wavelength, slower the speed of colour The violet colour travels slower than the red colour The violet colour travels faster than the red colour All the colours of white light travel with the same speed None 10. 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 11. 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 +4.0 D +4.5 D +3.0 D None 12. A ray of light containing both red and blue colours is incident on the refracting surface of a prism. Then, red colour suffers more deviation deviation depends on the angle of prism both colours suffer equal deviation red colour suffers less deviation None 13. A young man has to hold a book at arm's length to be able to read it clearly. The defect of vision is: hypermetropia astigmatism myopia presbyopia None 14. 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 Concave lens of 12 cm focal length Convex lens of 12 cm focal length Concave lens of 20 cm focal length Convex lens of 20 cm focal length None 15. 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: cataract hypermetropia myopia presbyopia None 16. 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? Atmospheric refraction Scattering Reflection Refraction None 17. The phenomenon of splitting of sunlight by a prism is called_________ and the color that deviates most is ______ Dispersion,violet Reflection,violet Refraction,Red Scattering,Yellow None 18. 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: + 60 cm - 60 cm - 30 cm + 30 cm None 19. A person cannot see distant objects clearly. his vision can be corrected by using the spectacle containing : convex lenses plane lenses concave lenses contact lenses None 20. 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 1/2D 1/4D 4D 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.
