10th Class Science Human Eye and Colourful World Question Bank

done Human Eye and Colourful World Total Questions - 20

• question_answer1)

  Direction: Read the passage carefully and answer the following question. A beam of white light falling on a glass prism gets split into seven colours marked 1 to 7 as shown in figure.

  Which of the following statements is correct?
  A)
  The colour at position marked 5 is similar to the colour of gold metal. done clear
  B)
  The colour at position marked 2 has longer wavelength than 1. done clear
  C)
  The colour at position marked 7 is violet. done clear
  D)
  The colour at position marked 5 has higher speed than 1. done clear
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• question_answer2)

  Direction: Read the passage carefully and answer the following question. A beam of white light falling on a glass prism gets split into seven colours marked 1 to 7 as shown in figure.

  Which of the following statement is correct?
  A)
  The colours in the order of increasing wavelength are 1 <2<3<4<5<6<7. done clear
  B)
  The colours in the order of increasing frequency are 1 <2<3<4<5<6<7. done clear
  C)
  The colours in the order of decreasing speed are 7>6>5>4>3>2>1. done clear
  D)
  The colours in the order of decreasing deviation are 1>2>3>4>5>6>7. done clear
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• question_answer3)
  Which of the following statements is incorrect?
  A)
  In primary rainbow, red colour is formed on the outside and violet colour on the inside. done clear
  B)
  A normal human eye cannot clearly see all the objects at the different distances. done clear
  C)
  A beam of white light gives a spectrum on passing through a hollow prism. done clear
  D)
  Aqueous humour maintains the shape of the front part of the eye. done clear
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• question_answer4)

  Two equilateral prisms are arranged as shown in diagram.

  If white light incident on prism X then

  Statement 1: The ray of light which emerges out of the prism Y will be white light.

  Statement 2: The refraction produced by the prism Y is equal and opposite to that produced by prism X.

   
  A)
  Both statements 1 and 2 are true and statement 2 is the correct explanation of statement 1. done clear
  B)
  Both statements 1 and 2 are true but statement 2 is not the correct explanation of statement 1. done clear
  C)
  Statement 1 is true but statement 2 is false. done clear
  D)
  Statement 1 is false but statement 2 is true. done clear
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• question_answer5)
  An old person is unable to see clearly nearby objects as well as distant object. To correct the vision, what kind of lens will he require?                            
  A)
  Concave lens                    done clear
  B)
  Bifocal lens whose upper portion is concave lens and lower portion is convex lens.                      done clear
  C)
  Convex lens                     done clear
  D)
  Bifocal lens whose upper portion is convex lens and lower portion is concave lens. done clear
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• question_answer6)
  Observe the given diagram carefully. What could be the causes of this defect?

  (i) The focal length of the eye lens is too long.

  (ii) The eyeball becomes too small.

  (iii) The focal length of the eye lens is too small.

  (iv) The eyeball becomes too long.

   
  A)
  Only (i) and (ii) done clear
  B)
  Only (i) and (iv) done clear
  C)
  Only (ii) and (iii) done clear
  D)
  Only (iii) and (iv) done clear
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• question_answer7)
  An optician while testing the eyes find the vision of a patient to be 6/9. By this he means that
  A)
  The person can read the letters of 6 inches from a distance 9 m. done clear
  B)
  The person can read the letters of 9 inches from 6 m. done clear
  C)
  The person can read letters from 6 m which the normal eye can read from 9 m. done clear
  D)
  The person can read letters from 9 m which the normal eye can read from 6 m. done clear
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• question_answer8)
  Figures (a), (b), (c) and (d) respectively correspond to

  (a)

  (b)

  (c)

  (d)

   
  A)
  The short-sighted eye, the correction of long- sightedness, the long-sighted eye and the correction of short-sightedness done clear
  B)
  The short-sighted eye, the correction of short-sightedness, the long-sighted eye and the correction of long-sightedness done clear
  C)
  The long-sighted eye, the correction of short-sightedness, the short- sighted eye and the correction of long-sightedness done clear
  D)
  None of these. done clear
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• question_answer9)
  Read the given statements and mark the correct option.

  Statement 1: A normal human eye can clearly see all the objects below and above 25 m.

  Statement 2: The human eye has the capacity to suitably adjust the focal length of its lens to a certain extent.

   
  A)
  Both statements 1 and 2 are true and statement 2 is the correct explanation of statement 1. done clear
  B)
  Both statements 1 and 2 are true but statement 2 is not the correct explanation of statement 1. done clear
  C)
  Statement 1 is true but statement 2 is false. done clear
  D)
  Statement 1 is false but statement 2 is true. done clear
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• question_answer10)
  A passenger in an aeroplane
  A)
  shall never see a rainbow. done clear
  B)
  may see a primary and a secondary rainbow as concentric circles. done clear
  C)
  may see a primary and a secondary rainbow as concentric arcs. done clear
  D)
  shall never see a secondary rainbow. done clear
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• question_answer11)
  In a room, artificial rain is produced at one end and a strong source of white light is switched on at the other end. To observe the rainbow an observer must
  A)
  Look anywhere in the room done clear
  B)
  Look towards the source done clear
  C)
  Look towards the raindrops with the light source behind him done clear
  D)
  Look in a direction equally inclined to the source of raindrops. done clear
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• question_answer12)
  Match the column I with column II and select the correct option from the codes given below.

  Column I	Column II
  (a) Choroid	(i) Detects light stimulus
  (b) Retina	(ii) Absorbs light and prevent it from being reflected within the eyeball
  (c) Comea	(iii) Controls the size of the pupil
  (d)  Iris	(iv) Helps to focus light as it enters the eye

   
  A)
  (a)-(ii), (b)-(i), (c)-(iv), (d)-(iii) done clear
  B)
  (a)-(i), (b)-(ii), (c)-(iii), (d)-(iv) done clear
  C)
  (a)-(ii), (b)-(iii), (c)-(iv), (d)-(i) done clear
  D)
  (a) -(iii), (b)-(iv), (c)-(i), (d)-(ii) done clear
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• question_answer13)
  A person needs a lens of power 2.5 D for correction of her vision. Then

  (i) Focal length of the lens is 40 cm.

  (ii) Focal length of the lens is - 40 cm.

  (iii) Nature of the lens is concave.

  (iv) Nature of the lens is convex.

  (v) She is suffering from myopia.

   
  A)
  Only (i) and (iv) are correct. done clear
  B)
  Only (ii) and (iii) are correct. done clear
  C)
  Only (i) (iii) and (v) are correct. done clear
  D)
  Only (ii) and (iii) are correct. done clear
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• question_answer14)
  The lens of the eye can become thicker and thinner. Why is this flexibility useful?
  A)
  The lens allows the eye to focus on far objects as well as near objects. done clear
  B)
  The lens can allow varying amounts of light to enter the eye. done clear
  C)
  The eye can move up, down, left, and right. done clear
  D)
  The lens is not likely to break. done clear
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• question_answer15)
  A prism ABC (with BC as base) is placed in different orientations. A narrow beam of white light is incident on the prism as shown in figure. In which of the following cases, after dispersion, the third colour from the top corresponds to the colour of the sky?
  A)
  (i)                                 done clear
  B)
  (ii)                     done clear
  C)
  (iii)                    done clear
  D)
         (iv) done clear
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• question_answer16)
  A person with a myopic eye cannot see objects beyond 1.4 m distinctly. The type of the corrective lens used to restore proper vision should be
  A)
  A concave lens of focal length - 1.4 m and power + 0.71 D. done clear
  B)
  A convex lens of focal length 1.4 m and power + 0.71 D. done clear
  C)
  A concave lens of focal length - 1.4 m and power - 0.71 D. done clear
  D)
  A convex lens of focal length - 1.4 m and power - 0.71 D done clear
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• question_answer17)
  You are given four sources of light each one providing a light of a single colour - red, blue, green and yellow. Suppose the angle of refraction for a beam of yellow light corresponding to a particular angle of incidence at the interface of two media is \[90{}^\circ .\] Which of the following statements is correct, if the source of yellow light is replaced with that of other lights without changing the angle of incidence?
  A)
  The beam of red light would undergo total internal reflection. done clear
  B)
  The beam of red light would bend towards normal while it gets refracted through the second medium.        done clear
  C)
  The beam of blue light would undergo total internal reflection. done clear
  D)
  The beam of green light would bend away from the normal as it gets refracted through the second medium. done clear
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• question_answer18)
  Light is incident normally on face AB of a prism as shown in figure. A liquid of refractive index is placed on face AC of the prism. The prism is made of glass of refractive index 3/2. The limits of \[\mu \] for which total internal reflection takes place on face AC is
  A)
  \[\mu >\frac{3\sqrt{3}}{2}\]                   done clear
  B)
  \[\mu >\sqrt{3}\]            done clear
  C)
  \[\mu <\frac{3\sqrt{3}}{4}\]       done clear
  D)
         \[\mu <\frac{3\sqrt{3}}{8}\]       done clear
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• question_answer19)
  Which of the following statements are correct regarding scattering of light?

  (i) Scattering is responsible for the bluish appearance of the sky.

  (ii) Clouds having droplets of water scatter all wavelengths are almost equal and so are generally white.

  (iii) Advanced sunrise and delayed sunset.

   
  A)
  Only (i) and (ii) are correct. done clear
  B)
  Only (ii) and (iii) are correct. done clear
  C)
  Only (iii) is correct. done clear
  D)
  All (i), (ii) and (iii) are correct. done clear
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• question_answer20)
  Consider the given statements and select the correct option which correctly identifies true (T) and false (F).

  (i) The focal length of the eye lens increases when eye muscles are relaxed and lens becomes thinner.

  (ii) Stars appear to twinkle because of movement of air only.

  (iii) In the dim light, the size of pupil increases.

  (iv) The blind spot on retina has high concentration of nerve ending.

           
  A)

  (i)	(ii)	(iii)	(iv)
  T	T	F	F

    done clear
  B)

  (i)	(ii)	(iii)	(iv)
  F	F	T	T

    done clear
  C)

  (i)	(ii)	(iii)	(iv)
  T	F	T	F

    done clear
  D)

  (i)	(ii)	(iii)	(iv)
  F	T	F	T

    done clear
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