8th Class Science Light Question Bank

done Light Total Questions - 35

• question_answer1)
  X is a surface that cannot produce clear images. What is X?
  A)
   Rough surface done clear
  B)
                          Ideal surface done clear
  C)
                          Smooth surface done clear
  D)
                          Smooth but curved surface done clear
  View Solution play_arrow

• question_answer2)
  With what is glass coated in order to convert it into a mirror?
  A)
   Silver                                    done clear
  B)
                          Copper                done clear
  C)
                          Aluminium                         done clear
  D)
                          Platinum                             done clear
  View Solution play_arrow

• question_answer3)
  What makes objects visible?
  A)
   The absorption of light by objects done clear
  B)
                          The reflected light from the object done clear
  C)
                          The total internal reflection taking place in an object done clear
  D)
                          The refracted light from the object done clear
  View Solution play_arrow

• question_answer4)
  What is the phenomenon of light bouncing back into the same medium called?
  A)
   Reflection                          done clear
  B)
                          Refraction          done clear
  C)
                          Dispersion                          done clear
  D)
                          Splitting                               done clear
  View Solution play_arrow

• question_answer5)
  What is the perpendicular drawn at any point on a mirror called?
  A)
   Incident ray       done clear
  B)
                          Reflected ray                    done clear
  C)
                          Normal                                done clear
  D)
                          Image done clear
  View Solution play_arrow

• question_answer6)
  How many images are obtained when plane mirrors are arranged parallel to each other?
  A)
   A single image done clear
  B)
                          Two images done clear
  C)
                          Infinite number of images done clear
  D)
                          Zero image done clear
  View Solution play_arrow

• question_answer7)
  If the angle of incidence is \[{{80}^{o}},\] what will be the angle of reflection?     
  A)
   \[{{80}^{\text{o}}}\]                                      done clear
  B)
                          \[{{100}^{\text{o}}}\]    done clear
  C)
         \[{{160}^{\text{o}}}\]                    done clear
  D)
                          \[{{20}^{\text{o}}}\]                      done clear
  View Solution play_arrow

• question_answer8)
  Which of the following is used by E.N.T. doctors?
  A)
   Convex mirror done clear
  B)
                          Convex lens      done clear
  C)
                          Plane mirror                      done clear
  D)
                          Concave mirror done clear
  View Solution play_arrow

• question_answer9)
  A When the angle between two plane mirrors is \[60{}^\circ \], how many images will be formed by the mirrors?
  A)
   5                                             done clear
  B)
                          6                             done clear
  C)
                          7                                             done clear
  D)
                          8                             done clear
  View Solution play_arrow

• question_answer10)
  If the angle of incidence is \[{{50}^{\text{o}}}\], then calculate the angle between the incident ray and the reflected ray.
  A)
   \[{{50}^{\text{o}}}\]                                      done clear
  B)
                          \[{{100}^{\text{o}}}\]                    done clear
  C)
                          \[{{130}^{\text{o}}}\]                                    done clear
  D)
                          \[{{80}^{\text{o}}}\] done clear
  View Solution play_arrow

• question_answer11)
  In our houses, which of the following is used for looking at ourselves?
  A)
   Convex mirror done clear
  B)
                          Concave mirror done clear
  C)
                          Convex lens done clear
  D)
                          Plane mirror done clear
  View Solution play_arrow

• question_answer12)
  Which of the following statements is true?
  A)
   The angle of incidence is twice the angle of reflection. done clear
  B)
                          The incident ray, the reflected ray and the normal drawn at the point of incidence lie in the same plane. done clear
  C)
                          Some virtual images can be caught on the screen. done clear
  D)
                          A convex mirror forms a real image. done clear
  View Solution play_arrow

• question_answer13)
  What happens in lateral inversion?
  A)
   The right side of the object will be on the right side of the image. done clear
  B)
                          The left side of the object will be on the left side of the image. done clear
  C)
                          The top of the object will be the bottom of the object. done clear
  D)
                          The right side of the object will be on the left side of the image. done clear
  View Solution play_arrow

• question_answer14)
  In a periscope, how are the reflecting mirrors arranged?
  A)
   Perpendicular to each other done clear
  B)
                          Parallel to each other done clear
  C)
                          At an angle of \[{{90}^{\text{o}}}\] done clear
  D)
                          At an angle of \[{{60}^{\text{o}}}\] done clear
  View Solution play_arrow

• question_answer15)
  What is the nature of image formed on the retina of human eye of an object?
  A)
   Virtual and erect done clear
  B)
                          Virtual and inverted done clear
  C)
                          Real and erect done clear
  D)
                          Real and inverted done clear
  View Solution play_arrow

• question_answer16)
  Identify the value of persistence of vision.
  A)
   1/1 0th of a second done clear
  B)
                          1/12th of a second done clear
  C)
                          1/16th of a second done clear
  D)
                          1/20th of a second done clear
  View Solution play_arrow

• question_answer17)
  The characteristics of an eye disease are given below.

  (i) Eye sight becomes foggy

  (ii) Eye lens becomes cloudy

  (iii) There is a loss of vision

  In which of the following are the above characteristics observed?
  A)
   Myopia                                done clear
  B)
                          Presbyopia                        done clear
  C)
                          Hypermetropia                done clear
  D)
                          Cataract done clear
  View Solution play_arrow

• question_answer18)
  Which of the following is the requirement of nocturnal animals like owl an bat?
  A)
   Large cornea done clear
  B)
                          Large pupil done clear
  C)
                          Retina with large number of rods done clear
  D)
                          All of the above done clear
  View Solution play_arrow

• question_answer19)
  Look at the given figure. Find the angle between the incident ray and the reflected ray.
  A)
   \[{{60}^{\text{o}}}\] done clear
  B)
                          \[{{90}^{\text{o}}}\]                      done clear
  C)
                          \[{{80}^{\text{o}}}\]                                      done clear
  D)
                          \[{{40}^{\text{o}}}\] done clear
  View Solution play_arrow

• question_answer20)
  The diagram shows the path of a light ray X, directed at a plane mirror. Which of the following is the correct reflected ray?
  A)
   M                                           done clear
  B)
                          N                            done clear
  C)
                          O                                            done clear
  D)
                          P done clear
  View Solution play_arrow

• question_answer21)
  For a given incident ray, the plane of the mirror makes an angle\[\theta \]with the incident ray, then the reflected ray is turned through\[2\theta .\]Which of the following is based on the above principle?
  A)
   Periscope done clear
  B)
                          Kaleidoscope done clear
  C)
                          Shaving mirrors done clear
  D)
                          Automobile head lights done clear
  View Solution play_arrow

• question_answer22)
  An object placed 4 m from a plane mirror 'Br is shifted by 0.5 m away from the mirror. What is the distance between the object and its image?
  A)
   4 m                                        done clear
  B)
                          3.5 m                    done clear
  C)
                          9 m                                        done clear
  D)
                          5 m                        done clear
  View Solution play_arrow

• question_answer23)
  There are 11 letters in the word EXAMINATION. How many letters of this word are not changed when the word is seen in a plane mirror?
  A)
   11                                          done clear
  B)
                          5                             done clear
  C)
                          8                                             done clear
  D)
                          9 done clear
  View Solution play_arrow

• question_answer24)
  Observe the figure given below. Find the angle between the incident and the reflected ray.
  A)
   \[{{65}^{\text{o}}}\]                                      done clear
  B)
                          \[{{90}^{\text{o}}}\]      done clear
  C)
                          \[{{130}^{\text{o}}}\]                    done clear
  D)
                          25 done clear
  View Solution play_arrow

• question_answer25)
  How is a rainbow formed?
  A)
  When raindrops absorb sunlight done clear
  B)
                         When raindrops reflect sunlight done clear
  C)
                         When raindrops disperse sunlight done clear
  D)
                          When raindrops diffract sunlight done clear
  View Solution play_arrow

• question_answer26)
  Which of the following letters will be seen without any change in a plane mirror?
  A)
  S                              done clear
  B)
                         T                              done clear
  C)
                         L                              done clear
  D)
                         P done clear
  View Solution play_arrow

• question_answer27)
  Which of the following is the characteristic of an ideal mirror?
  A)
   It absorbs all the amount of light incident on it. done clear
  B)
                          It refracts all the light. done clear
  C)
                          It reflects all the light. done clear
  D)
                          All of the above done clear
  View Solution play_arrow

• question_answer28)
  In which of the following are plane mirrors arranged at an angle to get a number of colored images?
  A)
   Periscope                           done clear
  B)
                          Kaleidoscope    done clear
  C)
                          Telescope                          done clear
  D)
                          Thermoscope done clear
  View Solution play_arrow

• question_answer29)
  A series of fast moving still pictures can create an illusion of movement. Why?
  A)
   The eye can focus on very rapidly changing pictures. done clear
  B)
                          The eye is quicker than the brain. done clear
  C)
                          The eye can separate two images only when the interval of separation between them is one-sixteenth of a second. done clear
  D)
                          The optical cortex can see through the rapidly moving images. done clear
  View Solution play_arrow

• question_answer30)
  Which of the following prevents internal reflections of light inside the human eye?
  A)
   Iris                                         done clear
  B)
                          Pupil                     done clear
  C)
                          Choroid                               done clear
  D)
                          Blind spot done clear
  View Solution play_arrow

• question_answer31)
  For a normal eye, in an adult, what is the least distance of distinct vision?
  A)
   5 to 8 cm                             done clear
  B)
                          10 to 15 cm        done clear
  C)
                          20 to 25 cm                        done clear
  D)
                          30 to 35 cm        done clear
  View Solution play_arrow

• question_answer32)
  Identify the part of the human eye on which different images are formed.
  A)
   Iris                                         done clear
  B)
                          Pupil     done clear
  C)
                          Cornea                                done clear
  D)
                          Retina done clear
  View Solution play_arrow

• question_answer33)
  Identify the nature of the image formed by the eye lens of a human eye.
  A)
   Real, upright and enlarged done clear
  B)
                          Real, upright and diminished done clear
  C)
                          Real, inverted and diminished done clear
  D)
                          Virtual, inverted and diminished done clear
  View Solution play_arrow

• question_answer34)
  Which of the following occurs in persons suffering from myopia?
  A)
   The eye ball is shortened. done clear
  B)
                          Ciliary muscles contract. done clear
  C)
                          The eye ball elongates. done clear
  D)
                          The retina expands. done clear
  View Solution play_arrow

• question_answer35)
  According to the laws of reflection, which of the following statements is correct?
  A)
   The angle of incidence is greater than the angle of reflection. done clear
  B)
                          The angle of incidence is less than the angle of reflection. done clear
  C)
                          The angle of incidence is equal to the angle of reflection. done clear
  D)
                          The angle of incidence is not equal to the angle of reflection. done clear
  View Solution play_arrow