8th Class Science Light Question Bank

done Light Total Questions - 20

• question_answer1)
  Which one of the following is correct?
  A)
       done clear
  B)
  done clear
  C)
           done clear
  D)
               done clear
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• question_answer2)
  Which of the following ray diagrams shown below represents the image formed by the convex lens when the object is placed beyond 2F?
  A)
    done clear
  B)
  done clear
  C)
    done clear
  D)
  done clear
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• question_answer3)
  If two plane mirrors are inclined at an angle of \[\text{90 }\!\!{}^\circ\!\!\text{ }\] to each other, how many images of an object are seen?
  A)
  Only 1 done clear
  B)
  Only 2 done clear
  C)
  Only 3 done clear
  D)
  Any of 1, 2, 3 or 4 depending on the position of observer and object. done clear
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• question_answer4)
  Which of the following statements are correct regarding the image formed by a concave lens?

  (i) The nature of image does not change much with the change in the object distance.

  (ii) Always a virtual image is formed.

  (iii) The image is larger in size.

  (iv) Image is never formed between the optical centre and the focus.

  A)
  Only (i), (ii) and (iii) done clear
  B)
  Only (i) and (ii) done clear
  C)
  Only (iii) and (iv) done clear
  D)
  Only (ii), (iii) and (iv) done clear
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• question_answer5)
  If a person wants to see an enlarged image of the object by using a convex lens then the lens must be held
  A)
  Close to the object so that the object lies within the focal length of the lens done clear
  B)
  Far from the object so that the object lies beyond 2F done clear
  C)
  At infinity done clear
  D)
  Far from the object so that the object lies at 2F. done clear
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• question_answer6)
  Which of the following ray diagrams shown below shows respectively the short sightedness condition and its correctness by using a lens?
  A)
                      (a) and (d)                     done clear
  B)
  (a) and (c)          done clear
  C)
  (b) and (d)         done clear
  D)
         (b) and (c) done clear
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• question_answer7)
  A prism splits up light into different colours but a glass slab does not show dispersion because
  A)
  The emergent ray is deviated from the direction of the incident ray by the angle of deviation done clear
  B)
  The incident and emergent rays are parallel to each other done clear
  C)
  The emergent ray is laterally displaced from glass slab and changes its direction done clear
  D)
  The incident and emergent rays are not parallel to each other done clear
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• question_answer8)

  The diagram shows a ray of light reflected at a plane mirror.

  Which pair of the angle of incidence and angle of reflection is correct?

   
  A)

  Angle of Incidence	Angle of reflection
  \[\text{30 }\!\!{}^\circ\!\!\text{ }\]	\[\text{30 }\!\!{}^\circ\!\!\text{ }\]

  done clear
  B)

  Angle of Incidence	Angle of reflection
  \[\text{30 }\!\!{}^\circ\!\!\text{ }\]	\[\text{60 }\!\!{}^\circ\!\!\text{ }\]

    done clear
  C)

  Angle of Incidence	Angle of reflection
  \[\text{60 }\!\!{}^\circ\!\!\text{ }\]	\[\text{30 }\!\!{}^\circ\!\!\text{ }\]

                  done clear
  D)

  Angle of Incidence	Angle of reflection
  \[\text{60 }\!\!{}^\circ\!\!\text{ }\]	\[\text{60 }\!\!{}^\circ\!\!\text{ }\]

    done clear
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• question_answer9)
  For the myopic eye, the defect is cured by
  A)
  Convex lens       done clear
  B)
  Concave lens      done clear
  C)
  Cylindrical lens done clear
  D)
         None of these. done clear
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• question_answer10)
  An optician holds a test card 50 cm behind a patient. The patient then looks in the plane mirror which is 100 cm away. How far away from the patient's eyes is the image of the test card?
  A)
  100 cm done clear
  B)
  150 cm  done clear
  C)
  200 cm  done clear
  D)
         250 cm done clear
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• question_answer11)
  The diagram shows a ray PQR travelling through a glass slab. Which option in the table gives the correct name for all three rays?
  A)

  P	Q	R
  Incident ray	Emergent ray	Refracted ray

                  done clear
  B)

  P	Q	R
  Incident ray	Refracted ray	Emergent ray

                  done clear
  C)

  P	Q	R
  Emergent ray	Incident ray	Refracted ray

                  done clear
  D)

  P	Q	R
  Emergent ray	Refracted ray	Incident ray

    done clear
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• question_answer12)

  A narrow beam of white light is passed through a glass prism as shown in the figure.

  Which of the following is the correct order of colours emerging from the prism?

     
  A)

  P	Q	R
  Red	Blue	Green

                  done clear
  B)

  P	Q	R
  Red	Green	Blue

    done clear
  C)

  P	Q	R
  Blue	Green	Red

                  done clear
  D)

  P	Q	R
  Blue	Red	Green

    done clear
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• question_answer13)
  A parallel beam of light is incident on a converging lens parallel to its principal axis. As one moves the source of light away from the lens on its principal axis, the intensity of light
  A)
  Remains constant done clear
  B)
  Continuously increases done clear
  C)
  Continuously decreases done clear
  D)
  First increases than decreases. done clear
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• question_answer14)
  Three light bulbs are concealed from an observer by an opaque wall as shown. Without shifting the positions of the observer and the bulbs, the images of which of the bulbs can the observer see from the plane mirror?
  A)
  P and P             done clear
  B)
  P and Q done clear
  C)
         Only P  done clear
  D)
         Q and R done clear
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• question_answer15)
              United Football Club are playing an evening match. The team's jersey has blue and white stripes. What colour would the stripes appear under floodlights which produce a yellow light?
  A)
  Black and yellow done clear
  B)
  Blue and white done clear
  C)
         Blue and yellow done clear
  D)
         Black and white done clear
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• question_answer16)
  Match the column I with column II and column III and select correct option from the codes given below. (Note: These columns are for convex lens.)

  	Column I (Position of the object)		Column II (Position of the image)		Column III (Type of Image
  (a)	Object beyond 2F	(i)	At 2F	(p)	Real, inverted, large
  (b)	Object at 2F	(ii)	Same side as the object	(q)	Virtual, erect, magnified
  (c)	Object between F and 2F	(iii)	Beyond 2F	(r)	Real, inverted, same size
  (d)	Object within the focal length	(iv)	Between F and 2F	(s)	Real, inverted, diminished

  A)

  (a)-(ii)-(p);

  (b)-(iii)-(q);

  (c)-(iv)-(r);

  (d)-(i)-(s)

    done clear
  B)

  (a)-(iv)-(s);

  (b)-(i)-(r);

  (c)-(iii)-(p);

  (d)-(ii)-(q)

  done clear
  C)

  (a)-(iii)-(q);

  (b)-(ii)-(s);

  (c)-(ii)-(r);

  (d)-(iii)-(p)

    done clear
  D)

  (a)-(i)-(r);

  (b)-(iv)-(p);

  (c)-(i)-(s);

  (d)-(iv)-(q)

    done clear
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• question_answer17)
  Read the given statements and select the correct option.

  Statement 1: A beam of light emitted by the point source placed in water always diverges in air.

  Statement 2: The refracted ray moves away from normal when a ray goes from a denser medium to a rarer medium.

  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)
  Both statements 1 and 2 are false. done clear
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• question_answer18)
  Consider the following statements and select the option which correctly identifies true (T) and false (F).

  (i) Part that gives colour to the eye is iris.

  (ii) Transparent outer layer that refracts light is lens.

  (iii) Retina is a light sensitive layer of the eye.

  (iv) Cornea is a region without any sensory cells.

   
  A)

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

    done clear
  B)

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

    done clear
  C)

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

    done clear
  D)

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

    done clear
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• question_answer19)
  Two plane mirrors AB and CD are placed at right angles to one another. A ray of light PQ hits AB at Q making an angle of \[\text{45 }\!\!{}^\circ\!\!\text{ }\] as shown in the diagram. This ray will be reflected from mirror CD at an angle.
  A)
  \[\text{20 }\!\!{}^\circ\!\!\text{ }\]                       done clear
  B)
  \[\text{35 }\!\!{}^\circ\!\!\text{ }\]           done clear
  C)
  \[\text{45 }\!\!{}^\circ\!\!\text{ }\]                       done clear
  D)
  \[\text{60 }\!\!{}^\circ\!\!\text{ }\] done clear
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• question_answer20)
  In the diagram, the coin is just out of sight. If water is poured into the metal can, the coin will
  A)
  Become visible done clear
  B)
  Appear smaller done clear
  C)
  Not be visible     done clear
  D)
  Float to the surface. done clear
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