Class 10 Science Chapter 11 The Human Eye and the Colourful World The answer to each chapter is provided in the list so that you can easily browse throughout different chapters NCERT Class 10 Science Chapter 11 The Human Eye and the Colourful World and select need one.
Class 10 Science Chapter 11 The Human Eye and the Colourful World
Also, you can read the SCERT book online in these sections Solutions by Expert Teachers as per SCERT (CBSE) Book guidelines. These solutions are part of SCERT All Subject Solutions. Here we have given Assam Board Class 10 Science Chapter 11 The Human Eye and the Colourful World Solutions for All Subjects, You can practice these here…
Multiple Choice Questions
Q.1. The human eye forms the image of an object at its :
( a ) Cornea.
( b ) Iris.
( c ) Pupil.
( d ) Retina.
Ans :- ( d ) Retina.
Q.2. The change in focal length of an eye-lens is caused by the action of the :
( a ) pupil.
( b ) Retina.
( c ) Ciliary muscles.
( d) Iris.
Ans :- ( c ) Ciliary muscles.
Q.3. The least distance of distinct vision for a young adult with normal vision is about :
( a ) 25 m
( b ) 2.5 cm
( c ) 25 cm
( d ) 2.5 cm
Ans :- ( c ) 25 cm
Q.4. Refraction of light in the eye occurs at :
( a ) The lens only.
( b ) The cornea only.
( c ) Both the cornea and lens.
( d ) The pupil.
Ans :- ( c ) Both the cornea and lens.
Q.5. The human eye can focus objects at different distances by adjusting the focal length of the eye-lens. This is due to
( a ) Presbyopia.
( b ) Accommodation.
( c ) Near-sightedness.
( d ) Far-sightedness.
Ans :- ( b ) Accommodation.
Q.6. A person cannot see distant objects clearly. His vision can be corrected by using the spectacles containing :
( a ) Concave lenses.
( b ) Plane lenses.
( c ) Contact lenses.
( d ) Convex lenses.
Ans :- ( a ) Concave lenses.
Q.7. A person finds difficulty in seeing nearby objects clearly. His vision can be corrected by using spectacles containing.
( a ) Converging lenses.
( b ) Diverging lenses.
( c ) Prismatic lenses.
( d ) Chromatic lenses.
Ans :- ( a ) Converging lenses.
Q.8. The animal which does not have eyes that 100 side ways is :
( a ) Horse.
( b ) Chicken.
( c ) Lion.
( d ) Fish.
Ans :- ( c ) Lion.
Q.9. With both eyes open, a person’s field of view is about :
( a ) 90°
( b ) 150°
( c ) 180°
( d ) 360°
Ans :- ( c ) 180°
Q.10. A beam of white light is shone onto a glass prism. The light cannot be :
( a ) Deviated.
( b ) dispersed.
( c ) Focused.
( d ) Refracted.
Ans :- ( c ) Focused.
Q.11. The colour of white light which suffers the maximum bending on passing through a glass prism is :
( a ) Yellow.
(b) Orange.
( c ) Red.
( d ) Violet.
Ans :- ( d ) Violet.
Q.12. Which of the following colour of white light is least deviated by the prism?
( a ) Green.
( b ) Violet.
( c ) Indigo.
( d ) Yellow.
Ans :- ( d ) Yellow.
Q.13. The splitting up of white light into seven colours on passing through a glass prism is called :
( a ) Refraction.
( b ) Deflection.
( c ) Dispersion.
( d ) Scattering.
Ans :- ( c ) Dispersion.
Q.14. Which of the following colour of white light has the least wavelength?
( a ) Red.
( b ) Orange.
( c ) Violet.
( d ) Blue.
Ans :- ( c ) Violet.
Q.15. The twinling of stars in due to atmospheric.
( a ) Reflection of light.
( b ) Dispersion of light.
( c ) Interference of light.
( d ) Refraction of light.
Ans :- ( d ) Refraction of light.
Q.16. The atmosphere refraction of light causes the twinkling of :
( a ) Planets only.
( b ) Stars only.
( c ) Planets and stars.
( d ) Stars and satellites.
Ans :- ( b ) Stars only.
Q.17. The stars appear higher in the than they actually are due to :
( a ) Diffraction of light.
( b ) Scattering of light.
( c ) Refraction of light.
( d ) Reflection of light.
Ans :- ( c ) Refraction of light.
Q.18. The stars twinkle but the planets do not twinkle at night because.
( a ) The stars are small but the planets are larte.
( b ) The stars are very large but planets are small.
( c ) The stars are much nearer but planets are far off.
( d ) The stars are far off but planets are nearer the earth.
Ans :- ( d ) The stars are far off but planets are nearer the earth.
Q.19. As light from a far off stars comes down towards the earth :
( a ) It bends away from the normal.
( b ) It bends towards the normal.
( c ) It does not bend at all.
( d ) It is reflected back.
Ans :- ( b ) It bends towards the normal.
Q.20. We can se the sun before the actual sunrise by about :
( a ) 5 minutes.
( b ) 2 minutes.
( c ) 2 hours.
( d ) 20 minutes.
Ans :- ( b ) 2 minutes.
Q.21. Due to atmospheric refraction of sunlight the time from sunrise sunset is lengthened by about :
( a ) 6 minutes.
( b ) 2 minutes.
( c ) 4 minutes.
( d ) 5 minutes.
Ans :- ( c ) 4 minutes.
Q.22. The day is longer on the earth by about 4 minutes because
( a ) The earth is round in shape.
( b ) The earth rotates on its axis.
( c ) The earth revolves round the sun.
( d ) The earth has atmosphere.
Ans :- The earth has atmosphere.
Q.23. The blue colour of sky is due to :
( a ) Refraction of light.
( b ) Dispersion of light.
( c ) Diffraction of light.
( d ) Scattering of light.
Ans :- ( d ) Scattering of light.
Q.24. The red colour of sun at the time of sunrise and sunset is because :
( a ) Red colour is least scattered.
( b ) Blue colour is least scattered.
( c ) Red colour is most scattered.
( d ) Blue colour is most scattered.
Ans :- ( d ) Blue colour is most scattered.
Q.25. Which of the following is not caused by the atmospheric refraction of light?
( a ) Twinkle of stars at night.
( b ) Sun appearing higher in the sky than it actually is
( c ) Sun becoming visible two minutes before actual sunrise.
( d ) Sun appearing red at sunset.
Ans :- ( d ) Sun appearing red at sunset.
Q.26. The sky appears blue because some of the blue component of sunlight is scattered by :
( a ) Gas molecules present in air.
( b ) Dust particles prescut in air.
( c ) Water droplets suspended in air.
( d ) Soot particles present in air.
Ans :- ( a ) Gas molecules present in air.
Q.27. Sunset kis red because at that time the light coming from the sun has to travel.
( a ) Lesser thickness of earth’s atmosphere.
( b ) Greater thickness of earth’s atmosphere.
( c ) Varying thickness of earth’s atmosphere.
( d ) Along the horizon.
Ans :- ( b ) Greater thickness of earth’s atmosphere.
Q.28. A beam of white light falls on a glass prism. The colour of light which undergoes the least bending on passing through the glass prism is :
( a ) Violet.
( b ) Red.
( c ) Green.
(d) Blue.
Ans :- ( b ) Red.
Q.29. The colour of white light which is deviated the maximum on passing through the glass prism is :
( a ) Blue.
( b ) Indigo.
( c ) Red.
( d ) Orange.
Ans :- ( b ) Indigo.
Q.30. Which of the following coloured light has the least speed in glass prism?
( a ) Violet.
( b ) Yellow.
( c ) Red.
( d ) Green.
Ans :- ( a ) Violet.
Q.31. The colored light having the maximum speed in glass prism is :
( a ) Blue.
( b ) Green.
( c ) Violet.
( d ) Yellow.
Ans :- ( d ) Yellow.
Q.32. Out of the following, the colour of light having the maximum wave length is :
( a ) Violet.
( b ) Indigo.
( c ) Greene.
( d ) Orange.
Ans :- ( d ) Orange.
Q.33. Having two eyes gives a person :
( a ) Deeper field of view.
( b ) Colour field of view.
( c ) Rear field of view.
( d ) Wider field of view.
Ans :- ( d ) Wider field of view.
Q.34. The animals of prey have :
( a ) Two eyes at the front.
( b ) Two eyes at the back.
( c ) Two eyes on the sides.
( d ) One eye at the front and one on the side.
Ans :- ( c ) Two eyes on the sides.
Q.35. The animals called predators have :
( a ) Both the eyes on the sides.
( b ) One eye on the side and one at the front.
( c ) One eye on the front and one at the back.
( d ) Both the eyes at the front.
Ans :- ( d ) Both the eyes at the front.
Q.36. The defect of vision which cannot be corrected by using spectacles is :
( a ) Myopia.
( b ) Presbyopia.
( c ) Cataract.
( d ) Hypermetropia.
Ans :- ( c ) Cataract.
Q.37. A person cannot see the distant object clearly. He is suffering from the defect of vision called :
( a ) Cataract.
( b ) Hypermetropia.
( c ) Myopia.
( d ) Presbyopia.
Ans :- ( c ) Myopia.
Q.38. Though a woman can see the distant objects clearly, she cannot sea the nearby object clearly. She is suffering from the defect of vison called :
( a ) Long-sight.
( b ) Short-sight.
( c ) Hind-sight.
( d ) Mid-sight.
Ans :- ( a ) Long-sight.
Q.39. A young man has to hold a book at arm’s length to be able to read it clearly. The defect of vision is :
( a ) Astigmatism.
( b ) Myopia.
( c ) Presbyopia.
( d ) Hypermetropia.
Ans :- ( d ) Hypermetropia.
Q.40. After testing the eyes of a child, the optician has prescribed the following lenses for his spectacles Left eye : +2.25 D Right eye : +2.25 D
The child is suffering from the defect of vision called :
( a ) Short-sightedness.
( b ) Long-sightedness.
( c ) Cataract.
( d ) Presbyopia.
Ans :- ( b ) Long-sightedness.
Q.41. A person got his eyes tested the opticiav’s prescription for his spectacles reads :
Left eye : – 3.00 D Right eye : –3.50 D
The person is having a defect of vision called
( a ) Presbyopia.
( b ) Myopia.
( c ) Astigmatism.
( d ) Hypermetropia.
Ans :- ( b ) Myopia.
Q.42. A student sitting on the last bench in the class cannot read the writing on the black board clearly but he can read the book lying on his desk clearly. Which of the following statement is correct about the student?
( a ) The near point of his eyes has receded away.
( b ) The near point of his eyes has come closer then.
( c ) The far point of his eyes has receded away.
( d ) The far point of his eyes has come closer to him.
Ans :- ( d ) The far point of his eyes has come closer to him.
Q.43. A man driving a car can read a distant road sign clearly but finds difficulty in reading the odometer on the dashboard of the car. Which of the following statement is correct about this man?
( a ) The near point of his has receded away.
( b ) The war point of his eyes has come closer to him.
( c ) The far point of his eyes has receded away.
( d ) The far point of his eyes has come closer to him.
Ans :- ( a ) The near point of his has receded away.
Q.44. The defect of vision in which the eye lans of a person gets progressively cloudy resulting in blurred vision is called :
( a ) Myopia.
( b ) Presbyopia.
( c ) Colourblindness.
( d ) Cataract.
Ans :- ( d ) Cataract.
Q.45. To focus the image of a nearby object on the retina of an eye :
( a ) the distant between eye and lens and retina is increased.
( b ) The distance between eye-lens and retina is decreased.
( c ) The thickness of eye-lens is decreased.
( d ) The thickness of eye-lens is increased.
Ans :- ( d ) The thickness of eye-lens is increased.
Q.46. The term ‘accommodation’ as applied to the eye, refers to its ability to :
( a ) Control the light intensity falling on the retina.
( b ) Erect the inverted image formed on the retina.
( c ) Vary the focal length of the lens.
( d ) Very the distance between the lens and retina.
Ans :- ( c ) Vary the focal length of the lens.
Q.47. Which of the following controls the amount of light entering the eye?
( a ) Ciliary muscles.
( b ) Lens .
( c ) Iris.
( d ) Cornea.
Ans :- ( c ) Iris.
Q.48. The human eye possesses the power of accommodation. This is the power to :
( a ) Alter the diameter of the pupil as the intensity of light changes.
( b ) Distinguish between lights of different colours.
( c ) Focus on objects at different distances.
( d ) Decide which of the two objects is closer.
Ans :- ( c ) Focus on objects at different distances.
Q.49. How does the eye change in order to focus an near or distant objects?
( a ) The lens moves in or out.
( b ) The ratines moves in or act.
( c ) The lens becomes thicker or thinner.
( d ) The pupil gets larger or smaller.
Ans :- ( c ) The lens becomes thicker or thinner.
Q.50. Which of the following changes occur when you walkout of bright sunshine in to a poorly lit room?
( a ) The pupil becomes larger.
( b ) The lens becomes thicker.
( c ) The ciliary muscle relaxes.
( d ) The pupil becomes smaller.
Ans :- ( a ) The pupil becomes larger.
Q.51. The size of the pupil of the eye is adjusted by :
( a ) Cornea.
( b ) Ciliary muscles.
( c ) Optic nerve.
( d ) Iris.
Ans :- ( d ) Iris.
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