8th Class Science Light Question Bank

done Light Conceptive Objective Problems Total Questions - 47

• question_answer1)
  The image formed by a plane mirror is always:
  A)
   Real                                      done clear
  B)
   Rrect done clear
  C)
   Virtual                  done clear
  D)
   Both (b) and (c) done clear
  View Solution play_arrow

• question_answer2)
  Reflection is possible in case of
  A)
   Plane mirror     done clear
  B)
   Transparent glass done clear
  C)
   Both (a) and (b)               done clear
  D)
   Neither (a) nor (b) done clear
  View Solution play_arrow

• question_answer3)
  The part of light which is returned back into the same medium is called
  A)
   Reflected light      done clear
  B)
   Refracted light done clear
  C)
   Both (a) and (b)               done clear
  D)
   Neither (a) nor (b) done clear
  View Solution play_arrow

• question_answer4)
  Motion and still pictures projected in a cinema hall are ____ images
  A)
   Real           done clear
  B)
  (b) Virtual done clear
  C)
   Erect                                     done clear
  D)
   All of these done clear
  View Solution play_arrow

• question_answer5)
  Image of our face in a plane mirror                  
  A)
   Is a virtual image done clear
  B)
   Is a real image done clear
  C)
   Cannot be taken on the screen done clear
  D)
   Both (b) and (c) done clear
  View Solution play_arrow

• question_answer6)
  If a mirror is rotated by \[{{10}^{o}}\], the reflected ray is rotated by
  A)
   \[{{10}^{o}}\]                                    done clear
  B)
   \[{{20}^{o}}\] done clear
  C)
   \[{{40}^{o}}\]                                    done clear
  D)
   \[{{30}^{o}}\] done clear
  View Solution play_arrow

• question_answer7)
  Statement I: All the light rays actually converge at some point Statement II: All the light rays appears to converge at some point
  A)
   Both Statements are true. Statement-II is the correct explanation of Statement-I. done clear
  B)
   Both Statements are true, Statement-II is not correct explanation of Statement-I. done clear
  C)
   Statement-I is true, Statement-II is false. done clear
  D)
   Statement-I is false, Statement-II is true. done clear
  View Solution play_arrow

• question_answer8)
  Statement I: Real images are always inverted Statement II: Virtual images are always erect
  A)
   Both Statements are true, Statement-II is the correct explanation of Statement-I. done clear
  B)
   Both Statements are true, Statement-II is not correct explanation of Statement-I. done clear
  C)
   Statement-I is true, Statement-II is false. done clear
  D)
   Statement-I is false, Statement-II is true. done clear
  View Solution play_arrow

• question_answer9)
  When a mirror is rotated through an angle 9 the reflected ray from it, turns through an angle of
  A)
   \[\theta \]                                          done clear
  B)
   \[\frac{\theta }{2}\]   done clear
  C)
   \[2\theta \]       done clear
  D)
   0 done clear
  View Solution play_arrow

• question_answer10)
  The incident ray and the reflected ray from a mirror are mutually perpendicular to each other. The angle of incidence is
  A)
   \[{{90}^{o}}\]                                    done clear
  B)
   \[{{45}^{o}}\]  done clear
  C)
   \[{{22.5}^{o}}\]                                done clear
  D)
   zero done clear
  View Solution play_arrow

• question_answer11)
  A ray of light is incident on a plane mirror at an angle of \[{{60}^{o}}.\] What is the angle of deviation?
  A)
   \[{{60}^{o}}\] done clear
  B)
   \[{{30}^{o}}\] done clear
  C)
   \[{{90}^{o}}\]                    done clear
  D)
   \[{{180}^{o}}\] done clear
  View Solution play_arrow

• question_answer12)
  An object situated at a distance of 10cm infront of a plane mirror. The distance of image from the mirror is
  A)
   10 cm done clear
  B)
   20 cm done clear
  C)
   5 cm                      done clear
  D)
   other value done clear
  View Solution play_arrow

• question_answer13)
  Statement I: The reflected ray formed by the plane mirror which is rotated with angle \[\theta \] is shifted through an angle of  \[2\theta \] Statement II: Reflected ray rotates with an angle of  \[2\theta \] if the mirror rotates with \[\theta \] .
  A)
   Both Statements are true, Statement-II is the correct explanation of Statement-I. done clear
  B)
   Both Statements are true. Statement-II is not correct explanation of Statement-I. done clear
  C)
   Statement-I is true. Statement-II is false. done clear
  D)
   Statement-I is false, Statement-II is true. done clear
  View Solution play_arrow

• question_answer14)
  You are watching your right palm in the plane mirror by placing it parallel to it, which is in front of you, then you will observe your palm as
  A)
   Right palm          done clear
  B)
   Left palm done clear
  C)
   Inverted right palm        done clear
  D)
   Inverted left palm done clear
  View Solution play_arrow

• question_answer15)
  A light ray is allowed to fall on the plane mirror. Now the mirror is rotated in plane of incidence, then which of the following will not change
  A)
   Reflected ray                    done clear
  B)
   Normal done clear
  C)
   Incident ray        done clear
  D)
   Angle of incidence done clear
  View Solution play_arrow

• question_answer16)
  Statement I: A school girl wears a school uniform of length 1 m. She requires a mirror of length 0.5 m fixed on the vertical wall to see her uniform in the mirror. Statement II: The minimum height of the mirror to be required to see the full image of man of height h is h/2.
  A)
   Both Statements are true, Statement-II is the correct explanation of Statement-I. done clear
  B)
   Both Statements are true, Statement-II is not correct explanation of Statement-I. done clear
  C)
   Statement-I is true, Statement-II is false. done clear
  D)
   Statement-I is false. Statement-II is true. done clear
  View Solution play_arrow

• question_answer17)
  Statement I: The phenomenon of left appearing right and right appearing left on reflection in a plane mirror is called later inversion. Statement II: Number of images formed for an object kept in between two mirror placed at angle \[{{90}^{o}}\] to each other are 3.
  A)
   Both Statements are true, Statement-II is the correct explanation of Statement-I. done clear
  B)
   Both Statements are true. Statement-II is not correct explanation of Statement-I. done clear
  C)
   Statement-I is true, Statement-II is false. done clear
  D)
   Statement-I is false, Statement-II is true. done clear
  View Solution play_arrow

• question_answer18)
  The spherical surfaces that have a property of reflection and that are highly polished are called
  A)
   Spherical mirror               done clear
  B)
   Plane mirror done clear
  C)
   Plane glass plate              done clear
  D)
   Both 1 and 2 done clear
  View Solution play_arrow

• question_answer19)
  Concave mirror acts as
  A)
   Converging mirror          done clear
  B)
   Diverging mirror done clear
  C)
   both 1 and 2                      done clear
  D)
   Plane mirror done clear
  View Solution play_arrow

• question_answer20)
  Convergence of concave mirror can be decreased by dipping in
  A)
   Water      done clear
  B)
   Oil done clear
  C)
   Both oil & water   done clear
  D)
   Neither oil nor water done clear
  View Solution play_arrow

• question_answer21)
  The diameter of spherical mirror in which reflection takes place is called
  A)
   Radius of curvature done clear
  B)
   Centre of curvature done clear
  C)
   Linear aperture     done clear
  D)
   Focal length done clear
  View Solution play_arrow

• question_answer22)
  For a concave mirror when object is placed at infinity the image is formed at
  A)
   Pole                                      done clear
  B)
   Principal focus done clear
  C)
   Centre of curvature       done clear
  D)
   Infinity done clear
  View Solution play_arrow

• question_answer23)
  The focal length of concave mirror is -40 cm. Its radius of curvature is
  A)
   -20 cm                  done clear
  B)
   +20 cF done clear
  C)
   -80 cm             done clear
  D)
   +80 cm done clear
  View Solution play_arrow

• question_answer24)
  Statement I: If refractive index of one medium is equal to refractive index of second medium, then beam does not bend at all Statement II: The bending of light does not depend on refractive indices of media.
  A)
   Both Statements are true. Statement-II is the correct explanation of Statement-I. done clear
  B)
   Both Statements are true, Statement-II is not correct explanation of Statement-I. done clear
  C)
   Statement-I is true. Statement-II is false. done clear
  D)
   Statement-I is false. Statement-II is true. done clear
  View Solution play_arrow

• question_answer25)
  The light ray passes in homogeneous medium
  A)
   Straight line                       done clear
  B)
   Curved line done clear
  C)
   Un identified                    done clear
  D)
   Zig-zag mode done clear
  View Solution play_arrow

• question_answer26)
  The bending of a light which passes from one medium to other medium is
  A)
   Reflection          done clear
  B)
   Refraction done clear
  C)
   Attraction          done clear
  D)
   Repulsion done clear
  View Solution play_arrow

• question_answer27)
  The second medium is optically denser
  A)
   Ray bends towards normal done clear
  B)
   Ray bends away from normal done clear
  C)
   It passes in same path done clear
  D)
   Unidentified done clear
  View Solution play_arrow

• question_answer28)
  When light travels from rarer medium to denser medium
  A)
   Refracted ray bends towards normal done clear
  B)
   Refracted ray bends away from normal done clear
  C)
   Ray undedicated from path. done clear
  D)
   We cannot identified the ray. done clear
  View Solution play_arrow

• question_answer29)
  If the speed of red light is denoted by \[{{V}_{r}}\], and the speed for violet light by \[{{V}_{v}}\]. Then in vacuum.
  A)
   \[{{V}_{r}}>{{V}_{v}}\]                  done clear
  B)
   \[{{V}_{r}}={{V}_{v}}\] done clear
  C)
   \[{{V}_{r}}<{{V}_{v}}\]                  done clear
  D)
   both 1 & 3 done clear
  View Solution play_arrow

• question_answer30)
  If refractive indices of glass and water are respectively \[{}^{3}/{}_{2}\] and \[{}^{4}/{}_{3}\], then the refractive index of glass with respective to water is
  A)
   2                                             done clear
  B)
   \[{}^{8}/{}_{9}\] done clear
  C)
   \[{}^{9}/{}_{8}\]              done clear
  D)
   \[{}^{1}/{}_{2}\] done clear
  View Solution play_arrow

• question_answer31)
  Statement I: When a light ray from rarer medium is refracted into denser medium its velocity decreases and wavelength decreases Statement II: Refractive index decreases with increases in temperature.
  A)
   Both Statements are true. Statement-II is the correct explanation of Statement-I. done clear
  B)
   Both Statements are true. Statement-II is not correct explanation of Statement-I. done clear
  C)
   Statement-I is true, Statement-II is false. done clear
  D)
   Statement-I is false. Statement-II is true. done clear
  View Solution play_arrow

• question_answer32)
  Statement I: When light travels from one medium to another, then frequency remains constant. Statement II: When the direction of light ray is reversed, the ray simply retraces its path, this statement is called the Principle of reversibility of light.
  A)
   Both Statements are true. Statement-II is the correct explanation of Statement-I. done clear
  B)
   Both Statements are true, Statement-II is not correct explanation of Statement-I. done clear
  C)
   Statement-I is true, Statement-II is false. done clear
  D)
   Statement-I is false. Statement-II is true. done clear
  View Solution play_arrow

• question_answer33)
  In the figure, A point source P is placed at a height 4 m above the plane mirror in a medium of refractive index 1.2 an observer 0 vertically above P, outside the liquid sees P and its image in the mirror. The apparent distance between these two is _____cm
  A)
   3.3 cm                                  done clear
  B)
   6.6 cm done clear
  C)
   9.9 cm  done clear
  D)
   13.2 cm done clear
  View Solution play_arrow

• question_answer34)
  A double convex air bubble in water would behave as a
  A)
   Convergent lens              done clear
  B)
   Circle done clear
  C)
   Divergent lens   done clear
  D)
   Pane mirror done clear
  View Solution play_arrow

• question_answer35)
  The graph drawn with object distance along x- coordinate and image (real) distance as y- coordinate for a convex is a
  A)
   Straight line       done clear
  B)
   Circle done clear
  C)
   Parabola                             done clear
  D)
   Rectangular hyperbola done clear
  View Solution play_arrow

• question_answer36)
  A layered lens as shown in the figure is made of two materials indicated by different shades. A point object is placed on its axis. The lens will form.
  A)
   One image        done clear
  B)
   Two images done clear
  C)
   Five images       done clear
  D)
   Three images done clear
  View Solution play_arrow

• question_answer37)
  A simple magnifying glass consists of a
  A)
   Convex lens done clear
  B)
   A concave lens done clear
  C)
   Convex lens of small focal length done clear
  D)
   Convex lens of large focal length done clear
  View Solution play_arrow

• question_answer38)
  A convergent lens of focal length 20 cm and made of a material with refractive index 1.1 is immersed in water the lens behaves as a
  A)
   Converging lens of focal length 20 cm done clear
  B)
   Converging lens of focal length less than 20 cm done clear
  C)
   Converging lens of focal length more than 20 cm done clear
  D)
   Diverging lens done clear
  View Solution play_arrow

• question_answer39)
  In case of convex lens, as object is coming closer to the lens the image will ___
  A)
   Move away from lens done clear
  B)
   Move towards the lens done clear
  C)
   Move up         done clear
  D)
   Not move done clear
  View Solution play_arrow

• question_answer40)
  A thin lens produces an image of the same size as the object. Then from the optical centre of the lens, the distance of the object is
  A)
   Zero                      done clear
  B)
   4 f     done clear
  C)
   2 f          done clear
  D)
   f/2 done clear
  View Solution play_arrow

• question_answer41)
  Which of the following eye parts is not in contact with the eye lens?
  A)
   Vitreous humour            done clear
  B)
   Ciliary fibres done clear
  C)
   Cornea           done clear
  D)
   Iris done clear
  View Solution play_arrow

• question_answer42)
  Which part of the human eye contracts and relaxes 2 in order to adjust the focal length of the lens?
  A)
   Iris                         done clear
  B)
   Pupil done clear
  C)
   Blind spot                           done clear
  D)
   Ciliary muscles done clear
  View Solution play_arrow

• question_answer43)
  The ciliary muscles of the human eye contract and relax in order to
  A)
   adjust the size of the eyeball done clear
  B)
   adjust the focal length of the lens done clear
  C)
   control the amount of light entering the eye done clear
  D)
   prevent foreign elements from entering the eye done clear
  View Solution play_arrow

• question_answer44)
  In the human eye, light is converted into electrical signals by the
  A)
   retina               done clear
  B)
   cornea done clear
  C)
   blind spot            done clear
  D)
   optical nerves done clear
  View Solution play_arrow

• question_answer45)
  The image formed by the eye lens on the retina is
  A)
   real, inverted, and large done clear
  B)
   virtual, erect, and large done clear
  C)
   real, inverted, and diminished done clear
  D)
   virtual, erect, and diminished done clear
  View Solution play_arrow

• question_answer46)
  While sitting on the first bench, Mutum finds it difficult to read what is written on the blackboard. However, he can clearly see the same when he sits on the last bench. It can be concluded that Mutum is suffering from
  A)
   myopia                done clear
  B)
   cataract done clear
  C)
   astigmatism         done clear
  D)
   hypermetropia done clear
  View Solution play_arrow

• question_answer47)
  Consider three statements regarding the defects of eye .I. If the size of the eye ball decreases, then the person suffers from myopia .II. If the near point of eye becomes greater than 25 cm, then the person is said to suffer from hypermetropia .III. A person, at older age, suffering from presbyopia uses a bifocal lens for correction. Among the given statements,
  A)
   only statement I is correct done clear
  B)
   only statement II is correct done clear
  C)
   both statements I and II are correct done clear
  D)
   both statements II and III are correct done clear
  View Solution play_arrow