10th Class Science Human Eye and Colourful World Question Bank

done The Human Eye and the Colourful World Total Questions - 40

• question_answer1)
  Which of the following colours combine in different proportions to form all the colours of light that we see around us?

  i. Red

  ii. Green

  iii. Blue

  iv. Yellow

  A)
  Only (i) and (ii) done clear
  B)
  Only (iii) and (iv) done clear
  C)
  Only (i), (ii) and (iii) done clear
  D)
  Only (i), (iii) and (iv) done clear
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• question_answer2)
  How long does the impression of an image remain on the human brain?
  A)
  1/4th to 1/8th of a second done clear
  B)
  1/16th to 1/20th of a second done clear
  C)
  1/20th to 1/24th of a second done clear
  D)
  1/6th to 1/10th of a second done clear
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• question_answer3)
  What is the average refractive index of the material of the lens in our eyes?
  A)
  1.396 done clear
  B)
  1.196                    done clear
  C)
  1.296                                    done clear
  D)
  1.496 done clear
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• question_answer4)
  Which of the following can correct the refractive defects in human eyes?
  A)
  Contact lenses done clear
  B)
  Laser treatment done clear
  C)
  Spectacles done clear
  D)
  All of the above done clear
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• question_answer5)
  Which of the following is/are the primary function(s) of the human eyes?
  A)
  It makes adjustments to allow appropriate amount of light into the eyes. done clear
  B)
  It bends the light rays to form a sharp image. done clear
  C)
  It collects and sends information to the brain for further processing. done clear
  D)
  All of the above done clear
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• question_answer6)
  The blind spot on the retina has
  A)
  numerous nerve endings. done clear
  B)
  no nerve endings. done clear
  C)
  few nerve endings. done clear
  D)
  nerve endings which increase in number as age advances. done clear
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• question_answer7)
  A man suffering from myopia cannot see the objects distinctly at a distance greater than 2 m. Which lens is required to correct the defect?
  A)
  -2 D done clear
  B)
  + 2 D done clear
  C)
  -0.5 D                   done clear
  D)
  +0.5 D done clear
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• question_answer8)
  How is myopia caused in human beings?
  A)
  Due to old age done clear
  B)
  Due to a change in focal length done clear
  C)
  Due to the shortening of the eye ball done clear
  D)
  Due to the elongation of the eye ball done clear
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• question_answer9)
  What does the colour of a star indicate?
  A)
  Its weight      done clear
  B)
  Its distance        done clear
  C)
  Its temperature done clear
  D)
  Its size done clear
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• question_answer10)
  Which colour of light travels with a minimum speed in glass?
  A)
  Blue                      done clear
  B)
  Green  done clear
  C)
  Violet                   done clear
  D)
  Red done clear
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• question_answer11)
  What is the approximate diameter of the eye ball?
  A)
  2.0 cm                                  done clear
  B)
  2.8 cm  done clear
  C)
  2.6 cm                  done clear
  D)
  2.3 cm done clear
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• question_answer12)
  Where does most of the refraction of light rays entering the eye occur?
  A)
   On the outer surface of the cornea done clear
  B)
   On the crystalline lens done clear
  C)
   On the vitreous humour done clear
  D)
   On the retina done clear
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• question_answer13)
  Which of the following occurs due to the weakening of the ciliary muscles and diminishing flexibility of the eye lens?
  A)
  Myopia                                done clear
  B)
  Hypermetropia done clear
  C)
  Presbyopia  done clear
  D)
  Astigmatism done clear
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• question_answer14)
  Which type of lenses are used, if a person suffers from both myopia and hypermetropia?
  A)
   Univocal done clear
  B)
   Concavo-convex done clear
  C)
   Bi-focal done clear
  D)
   Convexo-concave done clear
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• question_answer15)
  Why does white sunlight appear yellow?
  A)
   Due to reflection done clear
  B)
   Due to refraction done clear
  C)
   Due to atmospheric refraction done clear
  D)
   Due to deviation done clear
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• question_answer16)
  Which of the following is a natural optical instrument?
  A)
   A magnifying glass done clear
  B)
   An eye done clear
  C)
   A piece of glass done clear
  D)
   A plane mirror done clear
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• question_answer17)
  What happens to the frequency when light passes from one medium to another?
  A)
   It increases. done clear
  B)
   It decreases. done clear
  C)
   It remains constant. done clear
  D)
   It may increase or decrease. done clear
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• question_answer18)
  Which of the following is the first artificial aid of vision?
  A)
  A glass piece     done clear
  B)
  A piece of ice    done clear
  C)
  A glass of water done clear
  D)
  A mirror done clear
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• question_answer19)
  Which part in our eyes controls the size of the pupil?
  A)
  Iris                         done clear
  B)
  Pupil     done clear
  C)
  Cornea                done clear
  D)
  Ciliary muscles done clear
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• question_answer20)
  What is the field of view for human beings with two eyes?
  A)
  \[\text{12}0{}^\circ \]                   done clear
  B)
  \[\text{15}0{}^\circ \]   done clear
  C)
  \[\text{18}0{}^\circ \]                   done clear
  D)
  \[\text{36}0{}^\circ \] done clear
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• question_answer21)
  What portion of our eyes are opaque?
  A)
  One-third      done clear
  B)
  Two-fourth        done clear
  C)
  Three-fifth     done clear
  D)
  Five-sixth done clear
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• question_answer22)
  The eye is more sensitive to yellow colour but why are dangers signals painted red instead of yellow?
  A)
   The scattering of red light is much less than that of yellow light.          done clear
  B)
   The scattering of red light is more than that of yellow light. done clear
  C)
   Yellow light, when scattered, is brighter. done clear
  D)
   Red light, when scattered, is brighter. done clear
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• question_answer23)
  A long sighted person has a minimum distance of distinct vision of 50 cm. He wants to reduce it to 25 cm. He should use a
  A)
   concave lens of focal length 25 cm. done clear
  B)
   concave lens of focal length 50 cm. done clear
  C)
   convex lens of focal length 25 cm. done clear
  D)
   convex lens of focal length 50 cm. done clear
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• question_answer24)
  Which of the following defects are corrected by using a convex lens?
  A)
   Myopia, Hypermetropia done clear
  B)
   Hypermetropia, presbyopia done clear
  C)
   Myopia, presbyopia done clear
  D)
   Myopia, Cataract done clear
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• question_answer25)
  Two teams 'X' and 'Y' are playing football under flood lights that emit yellow light. Players of team X are dressed in white shirts and black shorts and players of team Y are dressed in yellow shirts and blue shorts. Which of the following is true of the colour change appearing in their dresses?                
  A)

  Team X	Team Y
  White shirts, blue shorts	White shirts, black shorts

                  done clear
  B)

  Team X	Team Y
  Yellow shirts, blue shorts	Yellow shirts, blue shorts

                  done clear
  C)

  Team X	Team Y
  Yellow shirts, black shorts	Yellow shirts, black shorts

                  done clear
  D)

  Team X	Team Y
  White shirts black shorts	White shirts, blue shorts

  done clear
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• question_answer26)
  How does the eye change its focus to see near or distant objects?
  A)
   The lens moves diagonally. done clear
  B)
   The retina expands and contracts. done clear
  C)
   The lens becomes thicker and thinner. done clear
  D)
   The pupil becomes larger and smaller. done clear
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• question_answer27)
  An object absorbed all the seven colours and does not reflect even one. What is its colour?
  A)
  White       done clear
  B)
  Black     done clear
  C)
  Pink                      done clear
  D)
  Yellow done clear
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• question_answer28)
  A student sitting on the last bench in the class cannot read the writing on the blackboard clearly. But he can read the book lying on his desk clearly. Which of the following statements is correct about his defect?
  A)
   The near point of his eyes has receded away. done clear
  B)
   The near point of his eyes has come closer to him. done clear
  C)
   The far point of his eyes has receded away. done clear
  D)
   The far point of his eyes has come closer to him. done clear
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• question_answer29)
  Which of the following produces yellow light?

  (i) Sodium lamp

  (ii) Sunlight

  (iii) LPG gas

  A)
  Only (i)                                done clear
  B)
  Only (i) and (ii) done clear
  C)
  Only (i) and (iii) done clear
  D)
  Only (ii) and (iii) done clear
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• question_answer30)
  An object does not have a colour of its own. On which of the following factors does it acquire a colour?
  A)
   The type of light incident on an object done clear
  B)
   The ratio in which an object absorbs the different colours of light done clear
  C)
   The manner in which the reflected or refracted light influences our eyes done clear
  D)
   All of the above done clear
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• question_answer31)
  If the earth had no atmosphere, how would the sky appear?
  A)
  Colorless             done clear
  B)
  White done clear
  C)
  Blue                      done clear
  D)
  Black done clear
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• question_answer32)
  On which side in the sky can we see a rainbow?
  A)
  On the north side done clear
  B)
  On the south side done clear
  C)
  In the direction opposite to the sun done clear
  D)
  The sun and the rainbow are on the same side done clear
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• question_answer33)
  A man wearing yellow coloured glass for left eye and red coloured glass for right eye stands in front of a plane mirror. Which of the given statements about his image in the mirror is correct?
  A)
   Both the eyes appear red. done clear
  B)
   Both the eyes appear yellow. done clear
  C)
   Left eye appears yellow and right eye, red. done clear
  D)
   Left eye appears red and right eye yellow. done clear
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• question_answer34)
  A man with myopic eyes cannot see objects at a distance of more than 60 cm from his eyes. Find the power of the lens to be used.
  A)
  -1.66 D                                  done clear
  B)
  +60 D     done clear
  C)
  -60 D                     done clear
  D)
  \[\frac{1}{1.66}D\] done clear
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• question_answer35)
  What causes the redness of a red coloured object ?
  A)
   The object absorbs red colour. done clear
  B)
   The object allows red colour to pass through. done clear
  C)
   The object absorbs and refracts red colour. done clear
  D)
   The object reflects red colour. done clear
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• question_answer36)
  Why are the red danger signals visible even though there is thick fog or smoke?

  (i) It has least wavelength

  (ii) It has longer wavelength

  (iii) It scatters the least

  A)
   Only (ii) done clear
  B)
   Only (i) and (ii) done clear
  C)
   Only (i) and (iii) done clear
  D)
   Only (ii) and (iii) done clear
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• question_answer37)
  A person having a myopic eye uses a concave lens of focal length 50 cm. What is the power of the lens?
  A)
  2 D                                         done clear
  B)
  - 2 D      done clear
  C)
  - 0.5 D                  done clear
  D)
  5 D done clear
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• question_answer38)
  A far-sighted man lost his spectacles. He estimated the radius of a plate by looking through a small hole in a sheet of paper. Why did he do so?
  A)
   Because equivalent focal length remains the same as that of the spectacles. done clear
  B)
   Because the focal length of the eye lens is effectively decreased. done clear
  C)
   Because the image of the plate is formed at a longer distance. done clear
  D)
   Both (a) and (b) done clear
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• question_answer39)
  A The power of a lens is +2.5 D. What kind of lens is it and what is its focal length?
  A)
   Concave lens, 100 cm done clear
  B)
   Concave lens, 40 cm done clear
  C)
   Convex lens, 40 cm done clear
  D)
   Convex lens, 50 cm done clear
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• question_answer40)
  Match the entries in Column-I with those in Column-II correctly.

  	Column-I		Column-II
  a.	The blue colour of the sky	1.	Total internal reflection
  b.	The glittering of diamond	2.	Refraction of light
  c.	The formation rainbow	3.	Scattering of light
  d.	The visibility of sun for something even after sunset	4.	Dispersion of light

  A)
   a-3, b-1, c-4, d-2 done clear
  B)
   a-1, b-3, c-2, d-4 done clear
  C)
   a-2, b-3, c-4, d-1 done clear
  D)
   a-4, b-1, c-3, d-2 done clear
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