{"id":16087,"date":"2021-08-04T17:09:00","date_gmt":"2021-08-04T11:39:00","guid":{"rendered":"https:\/\/apboardsolutions.guru\/?p=16087"},"modified":"2021-09-15T20:01:16","modified_gmt":"2021-09-15T14:31:16","slug":"ap-10th-class-physical-science-bits-chapter-5","status":"publish","type":"post","link":"https:\/\/apboardsolutions.guru\/ap-10th-class-physical-science-bits-chapter-5\/","title":{"rendered":"AP 10th Class Physical Science Bits Chapter 5 Human Eye and Colourful World with Answers"},"content":{"rendered":"

Practice the AP 10th Class Physical Science Bits with Answers<\/a> Chapter 5 Human Eye and Colourful World on a regular basis so that you can attempt exams with utmost confidence.<\/p>\n

AP State Syllabus 10th Class Physical Science Bits 5th Lesson Human Eye and Colourful World with Answers<\/h2>\n

CONCEPT – I : (Structure Of human Eye)<\/span><\/p>\n

Question 1.
\nThe value of “least distance of distinct vision” for young adult human being is ………………
\nA) 25 cm
\nB) 5 cm
\nC) 50 cm
\nD) infinity
\nAnswer:
\nA) 25 cm<\/p>\n

Question 2.
\nThe value of “least distance of distinct vision” at young age i.e below 10 years ……………….
\nA) 25 cm
\nB) 0 cm
\nC) infinity
\nD) 7 to 8 cm
\nAnswer:
\nD) 7 to 8 cm<\/p>\n

\"AP<\/p>\n

Question 3.
\nThe value of “least distance of distinct vision” at old age ………………..
\nA) 25 cm
\nB) infinity
\nC) 7 to 8 cm
\nD) 1 to 2 m
\nAnswer:
\nD) 1 to 2 m<\/p>\n

Question 4.
\nStatement X : The value of least distance of distinct vision varies from person to person and with age.
\nStatement Y : At young age (i.e below 10 years) the value of least distance of distinct vision is as close as 7to 8 cm due to the muscles around the eye are strong and flexible and can bear more strain.
\nA) Both X and Y are true
\nB) Both X and Y are false
\nC) X is true, Y is false
\nD) X is false, Y is true
\nAnswer:
\nA) Both X and Y are true<\/p>\n

Question 5.
\nStatement X : The value of least distance of distinct vision does not change with age.
\nStatement Y : In old age the muscles cannot sustain more strain hence the value of least distance of distinct vision shifts to a larger value.
\nA) Both X and Y are true
\nB) Both X and Y are false
\nC) X is true, Y is false
\nD) X is false, Y is true
\nAnswer:
\nD) X is false, Y is true<\/p>\n

Question 6.
\nThe range of vision for a young adult with normal vision ……………………..
\nA) 0 to 25 cm
\nB) 25 cm to 200 cm
\nC) 25 cm to infinity
\nD) zero to infinity
\nAnswer:
\nC) 25 cm to infinity<\/p>\n

Question 7.
\nThe angle of vision for a healthy human being is……………….
\nA) 60\u00b0
\nB) 70\u00b0
\nC) 80\u00b0
\nD) 180\u00b0
\nAnswer:
\nA) 60\u00b0<\/p>\n

Question 8.
\nThe maximum angle at which we are able to see the whole object is called ……………….
\nA) persistance of vision
\nB) angle of vision
\nC) least distance of distinct vision
\nD) none
\nAnswer:
\nB) angle of vision<\/p>\n

Question 9.
\nStatement X : The value of least distance of distinct vision varies from person to person and with age.
\nStatement Y : The angle of vision varies from person to person and with age.
\nA) Both X and Y are true
\nB) Both X and Y are false
\nC) X is true, Y is false
\nD) X is false, Y is true
\nAnswer:
\nA) Both X and Y are true<\/p>\n

\"AP<\/p>\n

Question 10.
\nIf the angle of vision is more than 60\u00b0 then you can see ………………….
\nA) the whole object
\nB) only the part of the object
\nC) both A and B
\nD) none
\nAnswer:
\nB) only the part of the object<\/p>\n

Question 11.
\nThe minimum distance from the eye at which the eye can see the objects clearly and distinctly without any strain is called …………………
\nA) the maximum distance of distinct vision
\nB) the average distance of distinct vision
\nC) the least distance of distinct vision
\nD) none
\nAnswer:
\nC) the least distance of distinct vision<\/p>\n

Question 12.
\nThe far point of human eye with normal vision lies at ………………..
\nA) 25 cm
\nB) 20 cm
\nC) 0 cm
\nD) infinity
\nAnswer:
\nD) infinity<\/p>\n

Question 13.
\nName the front part of the eye.
\nA) cornea
\nB) iris
\nC) aqueous humour
\nD) pupil
\nAnswer:
\nA) cornea<\/p>\n

Question 14.
\nName the coloured part that we see in an eye.
\nA) cornea
\nB) iris
\nC) ciliary muscles
\nD) pupil
\nAnswer:
\nB) iris<\/p>\n

Question 15.
\nName the part of the eye which controls the amount of light entering the eye.
\nA) cornea
\nB) iris
\nC) pupil
\nD) retina
\nAnswer:
\nB) iris<\/p>\n

Question 16.
\nName the liquid between the cornea and eye lens of the eye.
\nA) pupil
\nB) vitreous humour
\nC) aqueous humour
\nD) iris
\nAnswer:
\nA) pupil<\/p>\n

Question 17.
\nName the part of the eye which is a hole in the middle of the iris …………………
\nA) eye lens
\nB) retina
\nC) iris
\nD) pupil
\nAnswer:
\nC) iris<\/p>\n

\"AP<\/p>\n

Question 18.
\nName the part of the eye that appears black.
\nA) eye lens
\nB) retina
\nC) iris
\nD) pupil
\nAnswer:
\nD) pupil<\/p>\n

Question 19.
\nThe size of the pupil in low light condition …………………
\nA) increases
\nB) decreases
\nC) remains same
\nD) none
\nAnswer:
\nD) none<\/p>\n

Question 20.
\nThe size of the pupil in the case of bright (or) excess light condition ………………….
\nA) increases
\nB) decreases
\nC) remains same
\nD) none
\nAnswer:
\nA) increases<\/p>\n

Question 21.
\nThe size of the pupil …………….. when you entered into a cinema hall.
\nA) increases
\nB) decreases
\nC) remains same
\nD) none
\nAnswer:
\nB) decreases<\/p>\n

Question 22.
\n…………….. lens is present in the human eye.
\nA) Concave
\nB) Convex
\nC) Both
\nD) None
\nAnswer:
\nA) Concave<\/p>\n

Question 23.
\nThe human eye forms the image of an object at its ……………………
\nA) cornea
\nB) iris
\nC) retina
\nD) eyeball
\nAnswer:
\nC) retina<\/p>\n

Question 24.
\nThe distance between the eye lens and retina is …………………..
\nA) 2.25 cm
\nB) 2.27 cm
\nC) 2.5 cm
\nD) 5 cm
\nAnswer:
\nC) 2.5 cm<\/p>\n

Question 25.
\nStatement X : The image distance is fixed which is formed by eye lens.
\nStatement Y : The image formed on our retina is upside down.
\nA) Both statements are true
\nB) Both statements are false
\nC) X is true, Y is false
\nD) Y is false, Y is true
\nAnswer:
\nA) Both statements are true<\/p>\n

\"AP<\/p>\n

Question 26.
\nThe change in focal length of an eye lens is caused by the action of the ………………..
\nA) pupil
\nB) retina
\nC) ciliary muscles
\nD) iris
\nAnswer:
\nC) ciliary muscles<\/p>\n

Question 27.
\nWhen the eye is focused on a closer object the focal length of the eye lens ………………..
\nA) increases
\nB) decreases
\nC) remains same
\nD) none
\nAnswer:
\nB) decreases<\/p>\n

Question 28.
\nWhen the eye is focused on a distant object the focal length of the eye lens …………………….
\nA) increases
\nB) decreases
\nC) remains same
\nD) none
\nAnswer:
\nA) increases<\/p>\n

Question 29.
\nThe term “accommodation” as applied to the eye, refers to its ability to …………………..
\nA) control the light intensity falling on the retina.
\nB) vary the distance between eye lens and retina.
\nG) erect the inverted image on the retina.
\nD) change the focal length of the lens.
\nAnswer:
\nD) change the focal length of the lens.<\/p>\n

Question 30.
\nStatement X : The.focal length of the eye lens has maximum when the eye is focused on a distant object to focus the image.
\nStatement Y : The focal length of the eye lens has maximum when the eye is focused ‘ on a closer object to focus the image.
\nA) Both statements are true
\nB) Both statements are false
\nC) X is true, Y is false
\nD) X is false, Y is.true
\nAnswer:
\nA) Both statements are true<\/p>\n

Question 31.
\nStatement X : When the eye is focused on a closer object the ciliary muscles are strained and focal length of the eye lens increases.
\nStatement Y : When the eye is focused on a distant object the ciliary muscles are relaxed and focal length of the eye lens|decreases.
\nA) Both statements are true
\nB) Both statements are false
\nC) X is true, Y is false
\nD) X is false, Y is true
\nAnswer:
\nB) Both statements are false<\/p>\n

Question 32.
\nRefraction of light in the eye occurs at …………………..
\nA) only the lens
\nB) only the cornea
\nC) both the cornea and lens
\nD) none
\nAnswer:
\nA) only the lens<\/p>\n

\"AP<\/p>\n

Question 33.
\nStatement X : The eye lens forms a real and inverted image of an object on the retina.
\nStatement Y : The eye lens forms a virtual and erect image of an object on the retina.
\nA) Both statements are true
\nB) Both statements are false
\nC) X is true, Y is false
\nD) X is false, Y is true
\nAnswer:
\nC) X is true, Y is false<\/p>\n

Question 34.
\nThe range of focal length of an eye lens is…………………..
\nA) 0 to \u221d
\nB) 2.25 to 2.50 cm
\nC) 2.27 to 2.50 cm
\nD) 0 to 25
\nAnswer:
\nC) 2.27 to 2.50 cm<\/p>\n

Question 35.
\nThe value of focal length of the eye lens when an object is at infinity is ………………………
\nA) 2.50 cm
\nB) 2.25 cm
\nC) 2.27 cm
\nD) can’t find
\nAnswer:
\nA) 2.50 cm<\/p>\n

Question 36.
\nThe value of focal length of the eye lens when an object is placed at a distance of least distance of distinct vision is …………………….
\nA) 2.50 cm
\nB) 2.25 cm
\nC) 2.27 cm
\nD) 25cm
\nAnswer:
\nC) 2.27 cm<\/p>\n

Question 37.
\nThe value of focal length of the eye lens when the object is between infinity and the point of least distance of distinct vision is ……………………
\nA) greater than 2.5 cm
\nB) less than 2.27 cm
\nC) greater than 25 cm
\nD) between 2.27 cm to 2.50 cm
\nAnswer:
\nD) between 2.27 cm to 2.50 cm<\/p>\n

Question 38.
\nThe ability of eye – lens to change its focal length is called…………………..
\nA) power of lens
\nB) accommodation of lens
\nC) co-ordination of lens
\nD) none
\nAnswer:
\nB) accommodation of lens<\/p>\n

Question 39.
\nThe part of the eye sensitive to light is ……………………….
\nA) retina
\nB) pupil
\nC) ciliary muscles
\nD) cornea
\nAnswer:
\nA) retina<\/p>\n

\"AP<\/p>\n

Question 40.
\nThe cells preseritiri the retina of an eye which identify the colour of an object are ……………………
\nA) rods
\nB) cones
\nC) both rods arid cones
\nD) none
\nAnswer:
\nB) cones<\/p>\n

Question 41.
\nThe cells present in the retina of an eye which are sensitive to intensity of light are……………….
\nA) rods
\nB) cones
\nC) both rods and cones
\nD) none
\nAnswer:
\nA) rods<\/p>\n

Question 42.
\nThe light signals are transmitted to the brain through ……………………….
\nA) eye lens
\nB) pupil
\nC) retina
\nD) optic nerves
\nAnswer:
\nD) optic nerves<\/p>\n

Question 43.
\nThe function of the rods of the retina is to ……………………
\nA) adjust focal length of the eye lens
\nB) enable pupil to expand or contract to receive light
\nC) identify the intensity of light
\nD) identify the colour of light
\nAnswer:
\nC) identify the intensity of light<\/p>\n

Question 44.
\nThe maximum and minimum focal lengths of the eye lens respectively are ………………….
\nA) 2 cm, 1cm
\nB) 2.25 cm, 1.5 cm
\nC) 2.5 cm, 2.27 cm
\nD) 25 cm, 2.27 cm
\nAnswer:
\nC) 2.5 cm, 2.27 cm<\/p>\n

Question 45.
\nSelect the incorrect statement of the following.
\nA) The least distance of distinct vision at below 10 years age is 7- 8 cm
\nB) The least distance of distinct vision in old age is 1 m or even more
\nC) If angle of vision is above 60\u00b0 then we can see only the part of the object
\nD) Angle of vision and least distance of distinct vision are same for all persons
\nAnswer:
\nD) Angle of vision and least distance of distinct vision are same for all persons<\/p>\n

Question 46.
\nWhich part of human eye is called “Variable aperture”?
\nA) retina
\nB) cornea
\nC) pupil
\nD) lens
\nAnswer:
\nC) pupil<\/p>\n

Question 47.
\nFor any position of an object in front of the human eye the image distance is fixed at ………………………
\nA) 1 cm
\nB) 1.5 cm
\nC) 2.5 cm
\nD) 0.25 cm
\nAnswer:
\nC) 2.5 cm<\/p>\n

\"AP<\/p>\n

Question 48.
\nWhich of the following changes takes place when you walk out of bright sunshine into a poorly light room ?
\nA) The pupil becomes larger
\nB) The lens becomes thicker
\nC) The ciliary muscles relax
\nD) The pupil becomes smaller
\nAnswer:
\nD) The pupil becomes smaller<\/p>\n

Question 49.
\nWhen objects at different distances are seen by the eye one of the following remains constant.
\nA) focal length of the human eye lens
\nB) object distance from eye lens
\nC) the radii of curvature of eye lens
\nD) image distance from eye lens
\nAnswer:
\nD) image distance from eye lens<\/p>\n

Question 50.
\nWhich part of the human eye contains “rods” and “cones” to receive the light signals?
\nA) cornea
\nB) iris
\nC) pupil
\nD) retina
\nAnswer:
\nD) retina
\nQuestion 51.
\nFor any position of the object in front of the human eye the image distance is ………………
\nA) 25 cm
\nB) 5 cm
\nC) 2.5 cm
\nD) 1 cm
\nAnswer:
\nC) 2.5 cm<\/p>\n

CONCEPT – II : Defects Of Visions – Their Corrections<\/span><\/p>\n

Question 52.
\nWhich of the following is common defect of vision ?
\nA) Myopia
\nB) Hypermetropia
\nC) Presbyopia
\nD) All
\nAnswer:
\nD) All<\/p>\n

Question 53.
\nSome people can not see ob j ects at long distances but can see nearby objects clearly. This type of defect in vision is called ………………..
\nA) myopia
\nB) near sightedness
\nC) both A and B
\nD) hypermetropia
\nAnswer:
\nC) both A and B<\/p>\n

Question 54.
\nSome people can not see ob j ects at near distances but can see distant objects clearly. This type of defect in vision is called………………..
\nA) hypermetropia
\nB) long sightedness
\nC) both A and B
\nD) myopia
\nAnswer:
\nC) both A and B<\/p>\n

Question 55.
\nThe maximum focal length of the myopia eye is …………………
\nA) 2.5 cm
\nB) less than 2.5 cm
\nC) more than 2.5 cm
\nD) 22.7 cm
\nAnswer:
\nB) less than 2.5 cm<\/p>\n

\"AP<\/p>\n

Question 56.
\nThe minimum focal length of the hypermetropic eye is ……………….
\nA) 2.27cm
\nB) lessthan 2.27 cm
\nC) greaterthan 2.27 cm
\nD) 2.5 cm
\nAnswer:
\nC) greaterthan 2.27 cm<\/p>\n

Question 57.
\nThe point of maximum distance at which the eye lens can form an image on the retina is called
\nA) far point
\nB) near point
\nC) focal point
\nD) pupil
\nAnswer:
\nA) far point<\/p>\n

Question 58.
\nFor normal vision the far point is ……………….
\nA) 25 cm
\nB) 2.5 cm
\nC) 0
\nD) at infinity
\nAnswer:
\nD) at infinity<\/p>\n

Question 59.
\nFor myopic eye the far point lies ………………………
\nA) at 25 cm
\nB) between 25 cm and infinity
\nC) lessthan 25 cm
\nD) at infinity
\nAnswer:
\nB) between 25 cm and infinity<\/p>\n

Question 60.
\nFor hypermetropic eye the far point lies …………………..
\nA) at 25 cm
\nB) at lessthan 25 cm
\nC) at infinity
\nD) at zero
\nAnswer:
\nC) at infinity<\/p>\n

Question 61.
\nThe defect in which people can not see objects beyond far point is called …………………
\nA) myopia
\nB) hypermetropia
\nC) presbyopia
\nD) none
\nAnswer:
\nA) myopia<\/p>\n

Question 62.
\nThe point of minimum distance at which the eye lens cap form an image on the retina is called ……………………..
\nA) far point
\nB) near point
\nC) focal point
\nD) pupil
\nAnswer:
\nB) near point<\/p>\n

\"AP<\/p>\n

Question 63.
\nThe defect in which people can not see objects between near point and point of least distance of distinct vision is called …………………….
\nA) myopia
\nB) hypermetropia
\nC) presbyopia
\nD) none
\nAnswer:
\nB) hypermetropia<\/p>\n

Question 64.
\nStatement X : In myopia people can not see objects beyond far point.
\nStatement Y : In hypermetropia people can see objects beyond near point.
\nA) Both statements are true
\nB) Both statements are false
\nC) X is true, Y is false
\nD) X is false, Y is true
\nAnswer:
\nA) Both statements are true<\/p>\n

Question 65.
\nFor a myopic eye the image is formed ………………. when the object is placed beyond the far point.
\nA) at retina
\nB) before the retina
\nC) beyond the retina
\nD) none
\nAnswer:
\nB) before the retina<\/p>\n

Question 66.
\nFor a hypermetropic eye the image is formed……………., when the object is placed between near point and point of least distance of distinct vision.
\nA) at retina
\nB) before the retina
\nC) beyond the retina
\nD) none
\nAnswer:
\nC) beyond the retina<\/p>\n

Question 67.
\nMyopia can be corrected by using …………………….
\nA) concave lens
\nB) convex lens
\nC) bi focal lens
\nD) concave mirror
\nAnswer:
\nA) concave lens<\/p>\n

Question 68.
\nHypermetropia can be corrected by using ………………….
\nA) concave lens
\nB) convex lens
\nC) bi focal lens
\nD) convex mirror
\nAnswer:
\nB) convex lens<\/p>\n

\"AP<\/p>\n

Question 69.
\nWhich of the following ray diagram is correct for myopia defect ?
\n\"AP
\nD) all
\nAnswer:
\nD) all<\/p>\n

Question 70.
\nWhich of the following ray diagram is correct for hypermetropia defect.
\n\"AP
\nD) All
\nAnswer:
\nD) All<\/p>\n

Question 71.
\nThe focal length of the lens to be used to correct myopia when the far point distance is “d” cm.
\nA) f = 25d\/ (d – 25)
\nB) f = -d
\nC) f = (d – 25)\/ 25d
\nD) f = \\(\\frac{1}{\\mathrm{~d}}\\)
\nAnswer:
\nB) f = -d<\/p>\n

Question 72.
\nThe focal length of the lens to be used to correct hypermetropia when the near point distance is “d” cm.
\nA) f = 25d\/ (d – 25)
\nB) f = -d
\nC) f = (d-25)\/ 25d
\nD) f = \\(\\frac{1}{\\mathrm{~d}}\\)
\nAnswer:
\nA) f = 25d\/ (d – 25)<\/p>\n

Question 73.
\nThe ability of accommodation of the eye usually decreases with ageing. This type of defect in vision is called ………………….
\nA) myopia
\nB) hypermetropia
\nC) cataract
\nD) presbyopia
\nAnswer:
\nD) presbyopia<\/p>\n

Question 74.
\nA person suffering from myopia and hypermetropia uses ………………. lens.
\nA) convex
\nB) concave
\nC) bifocal
\nD) cylindrical
\nAnswer:
\nC) bifocal<\/p>\n

Question 75.
\nStatement X : Bifocal lens has concave lens at its upper portion and convex lens ‘at its lower portion.
\nStatement Y : Bifocal lens has convex lens at its upper portion and concave lens at its lower portion.
\nA) Both statements are true
\nB) Both statements are false
\nC) X is true, Y is false
\nD) X is false, Y is true
\nAnswer:
\nC) X is true, Y is false<\/p>\n

Question 76.
\nPresbyopia can be corrected by using ………………… lens.
\nA) convex
\nB) concave
\nC) bifocal
\nD) cylindrical
\nAnswer:
\nC) bifocal<\/p>\n

\"AP<\/p>\n

Question 77.
\nThe degree of convergence or divergence of light rays that can be achieved by a lens is called …………………..
\nA) accommodation
\nB) power
\nC) focal length
\nD) none
\nAnswer:
\nC) focal length<\/p>\n

Question 78.
\nThe reciprocal of focal length of a lens is called ……………………….
\nA) accommodation
\nB) power
\nC) focal length
\nD) radius of curvature
\nAnswer:
\nB) power<\/p>\n

Question 79.
\nThe unit of power is ………………………
\nA) diopter
\nB) meter
\nC) centimetre
\nD) 1\/diopter
\nAnswer:
\nA) diopter<\/p>\n

Question 80.
\nSee figure, parallel rays of light fall on eye and they converge before the retina. It represents a certain defect in the eye. To correct it …………….. lens is used.
\n\"AP
\nA) bi convex
\nB) biconcave
\nC) convex (or) cbncave
\nD) concavo – convex
\nAnswer:
\nB) biconcave<\/p>\n

Question 81.
\nDoctor tested the eyes of Raj Kumar and identified that he had hypermetropia. The distance of near point is 50 cm. The power of the lens suggested by the doctor to him is ……………………..
\nA) -2D
\nB) + 1D
\nC) – 1D
\nD) + 2D
\nAnswer:
\nD) + 2D<\/p>\n

Question 82.
\nIn case of eye defect called “myopia” image is formed ………………………
\nA) after retina
\nB) before retina
\nC) on retina
\nD) none
\nAnswer:
\nB) before retina<\/p>\n

Question 83.
\nIf a person uses a lens of -2.5 D power, then the focal length of the lens is ……………………
\nA) 40 cm
\nB) 50 cm
\nC) -40 cm
\nD) -50 cm
\nAnswer:
\nC) -40 cm<\/p>\n

Question 84.
\nFind the focal length of the lens if the power of the lens is – 2D
\nA) 49 cm
\nB) 50 cm
\nC) 52.5 cm
\nD) 55 cm
\nAnswer:
\nB) 50 cm<\/p>\n

\"AP<\/p>\n

Question 85.
\nA doctor advised to use 4D lens. The focal length of the lens is ……………………..
\nA) 25cm
\nB) 400cm
\nC) 4 cm
\nD) 40 cm
\nAnswer:
\nA) 25cm<\/p>\n

Question 86.
\nWhich of the following statements is correct ?
\nA) A person with hypermetropia can see near by objects clearly
\nB) A person with myopia can see near by objects clearly
\nC) A person with hypermetropia can not see distant objects clearly
\nD) A person with myopia can see distant objects clearly
\nAnswer:
\nB) A person with myopia can see near by objects clearly<\/p>\n

Question 87.
\nIf far point of a long sighted person is \u2018x\u2019. The focal length of the lens he has to use is …………………..
\nA) \\(\\frac{25 x}{x-25}\\)
\nB) \\(\\frac{25 x}{x+25}\\)
\nC) \\(\\frac{x-25}{25 x}\\)
\nD) \\(\\frac{x+25}{25 x}\\)
\nAnswer:
\nA) \\(\\frac{25 x}{x-25}\\)<\/p>\n

Question 88.
\nThe minimum focal length of eye lens for the person of hypermetropia is greater than …………………
\nA) 2.27 cm
\nB) 2.5 cm
\nC) 2.5 m
\nD) 2.27 m
\nAnswer:
\nA) 2.27 cm<\/p>\n

Question 89.
\nA doctor has advised to use 2.5D lens. The focal length of the lens is …………………..
\nA) 40 cm
\nB) 250 cm
\nC) 2.5 cm
\nD) 50 cm
\nAnswer:
\nA) 40 cm<\/p>\n

Question 90.
\nRamu can read a book perfectly well but cannot read the writing on black board unless he sits on the front row in class. Name the defect he has …………………..
\nA) myopia
\nB) hypermetropia
\nC) presbyopia
\nD) astigmatism
\nAnswer:
\nA) myopia<\/p>\n

Question 91.
\nA man can read the number of a distant bus clearly but he finds difficulty in reading a book. The defect of vision he has is …………………….
\nA) myopia
\nB) hypermetropia
\nC) presbyopia
\nD) astigmatism
\nAnswer:
\nB) hypermetropia<\/p>\n

\"AP<\/p>\n

Question 92.
\nA student sitting in the last row of the class room is not able to read clearly the writing on the black board. Name the defect he is suffering from.
\nA) myopia
\nB) hypermetropia
\nC) presbyopia
\nD) astigmatism
\nAnswer:
\nA) myopia<\/p>\n

Question 93.
\nA doctor has advised to use + 1D and + 1.5D lens for his left eye and right eye respectively of a patient. What type of defect he has …………………..
\nA) short – sightedness
\nB) long-sightedness
\nC) cataract
\nD) presbyopia
\nAnswer:
\nB) long-sightedness<\/p>\n

Question 94.
\nA 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 statements is correct about the student ?
\nA) The near point of his eyes has receded away
\nB) The near point of his eyes has, come closer to him
\nC) The far point of his eyes has receded away
\nD) The far point of his eyes has come closer to him
\nAnswer:
\nD) The far point of his eyes has come closer to him<\/p>\n

Question 95.
\nFar point of a person is 5 m. In order to have normal vision what kind of spectacles should he use ?
\nA) Concave lens with focal length 5 m
\nB) Concave lens with focal length 10 m
\nC) Convex lens with focal length 5 m
\nD) Convex lens with focal length 2.5 m
\nAnswer:
\nA) Concave lens with focal length 5 m<\/p>\n

CONCEPT – III : Dispersion and scattering of light<\/span><\/p>\n

Question 96.
\nA transparent medium separated from – the surrounding medium by atleast two plane surfaces which are inclined at a . certain angle in such a way that light incident on one of the plane surfaces emerges from the other plane surface is called ……………………..
\nA) a rectangular glass slab
\nB) a prism
\nC) a mirror
\nD) a lens
\nAnswer:
\nB) a prism<\/p>\n

Question 97.
\nWhich of the following statements is false?
\nA) The angle between the two rectangular plane surfaces of a prism is called the angle of the prism.
\nB) The angle between the emergent ray and normal is called the angle of emergence.
\nC) The angle between the emergent ray and incident ray is called angle of deviation.
\nD) The angle between the incident ray and refracted ray is called angle of deviation.
\nAnswer:
\nD) The angle between the incident ray and refracted ray is called angle of deviation.<\/p>\n

Question 98.
\nIdentify correctly marked angles from the figure.
\n\"AP
\nA) only i
\nB) i and e
\nC) i, e and d
\nD) none
\nAnswer:
\nC) i, e and d<\/p>\n

\"AP<\/p>\n

Question 99.
\nA ray of light falls on one of the lateral surface of an equilateral prism placed on the horizontal surface of a table as shown in figure. For minimum deviation of ray which of the following is true?
\n\"AP
\nA) PQ is horizontal
\nB) QR is horizontal
\nC) RS is horizontal
\nD) Either PQ or RS is horizontal
\nAnswer:
\nB) QR is horizontal<\/p>\n

Question 100.
\nA ray of light incident with 45\u00b0 on one of the lateral surface of an equilateral prism placed on the horizontal surface of a table. Find the minimum deviation produced by a prism.
\nA) 45\u00b0
\nB) 30\u00b0
\nC) 60\u00b0
\nD) 90\u00b0
\nAnswer:
\nB) 30\u00b0
\nQuestion 101.
\nFind angle of a glass prism from the graph.
\n\"AP
\nA) 30\u00b0
\nB) 45\u00b0
\nC) 60\u00b0
\nD) 90\u00b0
\nAnswer:
\nC) 60\u00b0<\/p>\n

Question 102.
\nStatement X : For minimum angle of deviation the angle of incidence is equal to angle of emergence.
\nStatement Y : For minimum angle of deviation the incidentray is parallel to the emergent ray.
\nA) Both statements are true
\nB) Both statements are false
\nC) X is true, Y is false
\nD) X is false, Y is true
\nAnswer:
\nA) Both statements are true<\/p>\n

Question 103.
\nThe relation among angle of incidence (i1<\/sub>) angle of emergence (i1<\/sub>) angle of deviation (d) and angle of prism (A)
\nA) A + i1<\/sub> = d + i2<\/sub>
\nB) A – d = i1<\/sub> + i2<\/sub>
\nC) A + d = i1<\/sub> + i2<\/sub>
\nD) A + d = i1<\/sub> – i2<\/sub>
\nAnswer:
\nC) A + d = i1<\/sub> + i2<\/sub><\/p>\n

Question 104.
\nThe formula for the refractive index of the prism …………………..
\n\"AP
\nD) n = sin (A + D) \/ sin A
\nAnswer:
\n\"AP<\/p>\n

Question 105.
\nA prism with an angle A = 60\u00b0 produces an angle of minimum deviation of 30\u00b0. Find the refractive index of the prism.
\nA) \u221a3
\nB) \\(\\frac{1}{\\sqrt{2}}\\)
\nC) \u221a2
\nD) 2
\nAnswer:
\nC) \u221a2<\/p>\n

Question 106.
\nThe value of angle of deviation produced by a prism …………………….
\nA) increases with increase in the value of angle of incidence
\nB) increases with increase in the value of wavelength of incident
\nC) decreases first and then increases with increase in the angle of incidence
\nD) increases first and then decreases with increase in the angle of incidence
\nAnswer:
\nC) decreases first and then increases with increase in the angle of incidence<\/p>\n

\"AP<\/p>\n

Question 107.
\nThe splitting of white light into different colours is called…………
\nA) dispersion
\nB) scattering
\nC) refraction
\nD) total internal reflection
\nAnswer:
\nA) dispersion<\/p>\n

Question 108.
\nThe colour of white light which suffers the maximum bending on passing through a glass prism is …………………….
\nA) red
\nB) yellow
\nC) green
\nD) violet
\nAnswer:
\nD) violet<\/p>\n

Question 109.
\nThe colour of white light which suffers the minimum refraction on passing through a glass prism is …………………
\nA) red
\nB) yellow
\nC) orange
\nD) violet
\nAnswer:
\nA) red<\/p>\n

Question 110.
\nIn the spectrum of white light the two colours appearing at the ends are ………………
\nA) red, violet
\nB) green, yellow
\nC) blue, red
\nD) red, orange
\nAnswer:
\nA) red, violet<\/p>\n

Question 111.
\nStatement X : The speed of light is constant in vacuum for all colours.
\nStatement Y : The speed of light is constant in medium for all colours.
\nA) Both statements are true
\nB) Both statements are false
\nC) X is true, Y is false
\nD) X is false, Y is true
\nAnswer:
\nC) X is true, Y is false<\/p>\n

Question 112.
\nStatement X : The refractive index of medium depends on wavelength of light.
\nStatement Y : The refractive index decreases with an increase in wavelength.
\nA) Both statements are true
\nB) Both statements are false
\nC) X is true, Y is false
\nD) X is false, Y is true
\nAnswer:
\nA) Both statements are true<\/p>\n

Question 113.
\nWhich of the following colour of white light has least Wavelength ?
\nA) Red
\nB) Violet
\nC) Indigo
\nD) Blue
\nAnswer:
\nB) Violet<\/p>\n

\"AP<\/p>\n

Question 114.
\nWhich of the following colour of white light has maximum wavelength ?
\nA) Green
\nB) Orange
\nC) Violet
\nD) Red
\nAnswer:
\nD) Red<\/p>\n

Question 115.
\nThe relation between wavelength and deviation is ……………………
\nA) wavelength \u221d deviation
\nB) wavelength \u221d \\(\\frac{1}{\\text { deviation }}\\)
\nC) wavelength = deviation
\nD) none
\nAnswer:
\nB) wavelength \u221d \\(\\frac{1}{\\text { deviation }}\\)<\/p>\n

Question 116.
\nThe relation between the speed of a wave (\u03c5), wavelength and (\u03bb) frequency
\n(f) is ……………………
\nA) f = \u03c5 \u03bb
\nB) \u03c5 = f \u03bb
\nC) \u03bb = f \u03c5
\nD) \u03bb = \\(\\frac{f}{v}\\)
\nAnswer:
\nB) \u03c5 = f \u03bb<\/p>\n

Question 117.
\nThe number of waves leaving the source per second is called …………………..
\nA) frequency
\nB) wavelength
\nC) speed of the wave
\nD) none
\nAnswer:
\nA) frequency<\/p>\n

Question 118.
\nWhich of the following does not change due to refraction ?
\nA) Wavelength
\nB) Speed of the wave
\nC) Frequency
\nD) None
\nAnswer:
\nC) Frequency<\/p>\n

Question 119.
\nStatement X : Speed of the wave increases with increase in , wavelength of light.
\nStatement Y : Frequency does not change due to refraction.
\nA) Both statements are true
\nB) Both statements are false
\nC) X is true, Y is false
\nD) X is false, Y is true
\nAnswer:
\nA) Both statements are true<\/p>\n

Question 120.
\nBright rainbow can be observed when the angle between incoming and outgoing light ray in a rain drop is …………………
\nA) 42\u00b0
\nB) 0\u00b0 to 40\u00b0
\nC) 40\u00b0
\nD) 0\u00b0 to 42\u00b0
\nAnswer:
\nD) 0\u00b0 to 42\u00b0<\/p>\n

\"AP<\/p>\n

Question 121.
\nThe red colour in a rainbow will be seen when the angle between a beam of sunlight and light sent back by a raindrop ………………….
\nA) 42\u00b0
\nB) 0\u00b0 to 40\u00b0
\nC) 40\u00b0
\nD) 0\u00b0 to 42\u00b0
\nAnswer:
\nA) 42\u00b0<\/p>\n

Question 122.
\nThe violet colour in a rainbow will be seen when the angle between a beam of sunlight and light sent back by a raindrop ……………….
\nA) 42\u00b0
\nB) 40\u00b0
\nC) 0\u00b0 to 42\u00b0
\nD) 0\u00b0 to 40\u00b0
\nAnswer:
\nB) 40\u00b0<\/p>\n

Question 123.
\nIf we look at the raindrops dispersing sunlight at an angle between 40\u00b0 and 42\u00b0 ………………..
\nA) we can observe only violet
\nB) we can observe only red
\nC) we can observe VIBGYOR
\nD) we can observe VIBG only
\nAnswer:
\nC) we can observe VIBGYOR<\/p>\n

Question 124.
\nThe light dispersed by the rain drops appears as a bow because ……………………
\nA) all drops that disperse the light towards us lie in the shape of bow
\nB) all drops that disperse the light towards us lie in the shape of cone with our eye as tip
\nC) all drops that disperse the light towards us lie in the shape of circle.
\nD) none
\nAnswer:
\nB) all drops that disperse the light towards us lie in the shape of cone with our eye as tip<\/p>\n

Question 125.
\nRainbow contains ………………………
\nA) red colour on the outermost layer
\nB) violet colour on the outermost layer
\nC) red colour on the innermost layer
\nD) yellow colour on the outermost layer
\nAnswer:
\nA) red colour on the outermost layer<\/p>\n

Question 126.
\nStatement X : A rainbow is always formed in a direction opposite to that of the sun.
\nStatement Y : A rainbow is produced by the dispersion of white sunlight by rain drop in the atmosphere.
\nA) Both statement are true
\nB) Both statement are false
\nC) X is true, Y is false
\nD) X is false, Y is true
\nAnswer:
\nA) Both statement are true<\/p>\n

Question 127.
\nWhich one of the following phenomena of light are involved in the formation of a rainbow?
\nA) refraction, dispersion
\nB) refraction, dispersion and total internal reflection
\nC) reflection, refraction and dispersion
\nD) dispersion, scattering and total internal reflection
\nAnswer:
\nB) refraction, dispersion and total internal reflection<\/p>\n

\"AP<\/p>\n

Question 128.
\nIn prism experiment the i – d curve looks like ………………………
\nA) straight line
\nB) circle
\nC) parabola
\nD) elipse
\nAnswer:
\nC) parabola<\/p>\n

Question 129.
\nThe splitting of white light into different colours is called …………………..
\nA) dispersion
\nB) scattering
\nC) refraction
\nD) reflection
\nAnswer:
\nA) dispersion<\/p>\n

Question 130.
\nLight is a\/an ……………………….
\nA) longitudinal wave
\nB) stationary wave
\nC) electromagnetic wave
\nD) none
\nAnswer:
\nC) electromagnetic wave<\/p>\n

Question 131.
\nWhat happens to refractive index of a medium when wavelength of incident light ray increases?
\nA) Decreases
\nB) Increases
\nC) Becomes zero
\nD) Becomes infinity
\nAnswer:
\nA) Decreases<\/p>\n

Question 132.
\nThe reason for low angle of deviation for red colour in dispersion of light is due to its …………………
\nA) low refractive index
\nB) high refractive index
\nC) low wavelength
\nD) frequency
\nAnswer:
\nA) low refractive index<\/p>\n

Question 133.
\nThe formation of rainbow in the sky is due to the dispersion of sunlight by ………………….
\nA) clouds
\nB) water droplets
\nC) air molecules
\nD) water in the sea
\nAnswer:
\nB) water droplets<\/p>\n

Question 134.
\nRead the following two statements and choose the correct answer.
\na) Red colour has the shortest wavelength.
\nb) Formation of rainbow is an example for dispersion.
\nA) only (a) is true
\nB) only (b) is true
\nC) (a) is false; (b) is true
\nD) both (a) and (b) are false
\nAnswer:
\nC) (a) is false; (b) is true<\/p>\n

Question 135.
\nThe process of re-emission of absorbed light in all directions with different intensities by atoms or molecules is called………………..
\nA) scattering of light
\nB) dispersion of light
\nC) refraction of light
\nD) reflection of light
\nAnswer:
\nA) scattering of light<\/p>\n

\"AP<\/p>\n

Question 136.
\nA small particle will scatter light of ……………. wavelength better.
\nA) large
\nB) shorter
\nC) medium
\nD) none
\nAnswer:
\nB) shorter<\/p>\n

Question 137.
\nStatement X : The intensity of scattered light varies with angle of scattering.
\nStatement Y : The intensity of scattered light is maximum at 90\u00b0 of angle of scattering.
\nA) Both statements are true
\nB) Both statements are false
\nC) X is true, Y is false
\nD) X is false, Y is true
\nAnswer:
\nA) Both statements are true<\/p>\n

Question 138.
\nThe blue colour of the sky is due to ……………………
\nA) refraction of light
\nB) dispersion of light
\nC) diffraction of light
\nD) scattering of light
\nAnswer:
\nD) scattering of light<\/p>\n

Question 139.
\nThe sky appears blue because some of the blue component of sunlight is scattered by
\nA) gas molecules present in air
\nB) dust particles present in air
\nC) water droplets suspended in air
\nD) soot particles present in air
\nAnswer:
\nA) gas molecules present in air<\/p>\n

Question 140.
\nWhich of the following molecules are responsible for the sky appearing blue
\nA) N2<\/sub>
\nB) O2<\/sub>
\nC) H2<\/sub>O
\nD) Both A and B
\nAnswer:
\nD) Both A and B<\/p>\n

Question 141.
\nThe scientific work of C.V. Raman is on
\nA) dispersion of light
\nB) total internal reflection of light
\nC) defects of vision
\nD) scattering of light
\nAnswer:
\nD) scattering of light<\/p>\n

Question 142.
\nThe red colour of the sun at the time of sunrise and sunset is because
\nA) red colour is least scattered
\nB) blue colour is least scattered
\nC) red colour is most scattered
\nD) blue colour is most scattered
\nAnswer:
\nA) red colour is least scattered<\/p>\n

Question 143.
\nAssertion (A) : Blue colour of the sky is due to scattering of light.
\nReason (R) : Blue colour has shortest wavelength among all colours of white light.
\nA) Both A and R are true
\nB) Both A and R are false
\nC) A is true but R is false
\nD) A is false but R is true
\nAnswer:
\nC) A is true but R is false<\/p>\n

\"AP<\/p>\n

Question 144.
\nAssertion (A) : The refractive index of a prism depends only on the kind of a glass which is made of and the colour of light.
\nReason (R) : The refractive index of a prism depends on the refracting angle of a prism and the angle of minimum deviation.
\nA) Both A and R are true
\nB) Both A and R are false
\nC) A is true but R is false
\nD) A is false but R is true
\nAnswer:
\nC) A is true but R is false<\/p>\n

Question 145.
\nWhich of the following statements is incorrect ?
\nA) The sun does not appear red during noon hours because the distance travelled by the sun rays in the atmosphere is less than that compared to morning and evening hours.
\nB) The sun appears red during sunrise and sunset because except red colour, all colours scatter more and vanish before they reach our eye.
\nC) Speed of light is constant in vacuum for all colours.
\nD) Speed of light is constant when it has passed through medium for all colotus.
\nAnswer:
\nD) Speed of light is constant when it has passed through medium for all colotus.<\/p>\n","protected":false},"excerpt":{"rendered":"

Practice the AP 10th Class Physical Science Bits with Answers Chapter 5 Human Eye and Colourful World on a regular basis so that you can attempt exams with utmost confidence. AP State Syllabus 10th Class Physical Science Bits 5th Lesson Human Eye and Colourful World with Answers CONCEPT – I : (Structure Of human Eye) …<\/p>\n","protected":false},"author":4,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"spay_email":""},"categories":[12],"tags":[],"jetpack_featured_media_url":"","_links":{"self":[{"href":"https:\/\/apboardsolutions.guru\/wp-json\/wp\/v2\/posts\/16087"}],"collection":[{"href":"https:\/\/apboardsolutions.guru\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/apboardsolutions.guru\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/apboardsolutions.guru\/wp-json\/wp\/v2\/users\/4"}],"replies":[{"embeddable":true,"href":"https:\/\/apboardsolutions.guru\/wp-json\/wp\/v2\/comments?post=16087"}],"version-history":[{"count":0,"href":"https:\/\/apboardsolutions.guru\/wp-json\/wp\/v2\/posts\/16087\/revisions"}],"wp:attachment":[{"href":"https:\/\/apboardsolutions.guru\/wp-json\/wp\/v2\/media?parent=16087"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/apboardsolutions.guru\/wp-json\/wp\/v2\/categories?post=16087"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/apboardsolutions.guru\/wp-json\/wp\/v2\/tags?post=16087"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}