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Human Eye-Class X-Vasu Classes

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1. Name the liquid present between eye lens and retina a) Water b) Vitreous humour c) Aquous humour d) Silica jel

2. The range of human eye is a) 50cm to infinity b) 25cm to infinity c) Zero to infinity d) 1m to 10m

3. What is the nature of the image formed by human eye on retina a) Real and erect b) Real and inverted c) Virtual and erect d) Virtual and inverted.

4. Which lens is present in human eye? a) convex lens b) concave lens c) plano concave d) plano convex

5. Deficiency of cone shaped cells causes a) colour blindness b) night blindness c) hypermetropia d) myopia

6. Concave lens is used to correct a) Myopia b) Hypermetropia c) Coloured blindness d) None

7. Comlementary colours produce a) white colour b) Black colour c) red colour d) blue colour

8. Which of these converts light energy into electric impulses a) Iris b) Retina c) Cornea d) aquous humour

9. Which of the following controls the size of pupil a) Sclera b) cornea c) Iris d) Cilliary muscles

10. Which of the following defects can not be corrected by using a lens a) Myopia b) Hypermetropia c) Cataract d) Presbyopia

11. Which defect is caused due to low converging power of eye lens? a) Myopia b) Hypermetropia c) Colour blindness d) Night blindness

12. The near point of a hypermetropic eye a) increases b) decreases c) 25cm d) less than 25cm

13. A person suffering from miopia as well as hypermetropia will use a) Concave lens b) Convex lens c) Bi-concave d) Bi-focal

14. An isosceless right angle prism is called a) totally reflecting prism b) partially reflecting c) refracting prism d) totally diffracting

15. The amount of light scattered by air molecules does not depend upon the wavelength of the light a) True b) False

16. We can see the sun before sunrise by about.......minutes a) 2 b) 4 c) 3 d) 1

17. The light of which colour is scattered most a) Blue b) Red c) Green d) Yellow

18. Stars would appear twinkle if we see from the moon a) True b) False

19. The frequency of these is maximum-minimum a) violet-red b) blue-red c) green -blue d) red-violet

20. If a person has been suffering from myopia his far point a) decreases b) increases c) not change d) none

21. Astigmatism can be corrected by using a) Convex lens b) Concave lens c) Bifocal lens d) cylindrical lens

22. A person with myopic eye can not see objects beyond a distance of 1.5m. What would be the power of of the corrective lens a) 0.7D b) 1.5D c) -1.5D d) -0.7D

23. A person with hypermetropic eye can see clearly when the object is placed at a distance of 40cm from him. What will be the power of corrective lens a) 2.5D b) 1.0D c) 1.5D d) -1.5D

24. An old person has a near point 100cm. what wil be the power of corrective lens a) -3D b) +3D c) -2.5D d) 1.5D

25. If a person is suffering from myopia , the image of distant object is formed a) before retia b) on retina c) behind the retina d) on the black spot

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