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Grade 8 EASE 1 review

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  • what is meant by reflection of light?
    bouncing back of light ray into the same medium after striking the surface at a point of incidence.
  • what is the main cause of refraction?
    change in speed of light or change in medium
  • The picture is an example of ..
    Refraction of light
  • what are asteroid made from ....
    rocks that orbit the sun
  • The colour of light which deviates the least
    Red
  • O Dean is wearing a blue soccer jersey. If Ahsan illuminates dean's soccer shirt with red light. what color will it show?
    black
  • What is the characteristic of the objects that reflect light well?
    They have shiny surface
  • TRUE or FALSE. If the surface of an object does not reflect light, you will not be able to see the objects.
    True
  • the colour of light that has maximum wave length
    Red
  • Name the asteroid that we have learned ...
    itokawa and ceres
  • the bending of light as it passes through different materials is ....
    Refraction
  • What is the Milky Way shape ?
    spiral
  • when light travels from water to air. Speed of the light will ...
    faster
  • Law of reflection state that - The angle of incidence is .................. to the angle of reflection.
    equal
  • The picture is an example of
    Reflection
  • If the angle of incidence is 45 degree, what is the angle between the incident ray and reflecting surface
    45
  • TRUE or FALSE. Plane mirror, convex mirror and concave mirror are examples of a refracted light.
    False
  • What are the three different shape of galaxies? a. spiral, b. circle, c. elliptical, d. irregular
    a,c,d
  • TRUE or FALSE. Objects under water appear closer to the surface than they really are because of reflection.
    False
  • the angle between the normal and the reflected ray is
    angle of reflection
  • Ms Wida has a cyan skirt. If she illuminates white light to the skirt. What colour would the skirt reflect ?
    green, blue and cyan colored light.
  • the range of different colours which is produced when light passes through a glass prism or through a drop of water is called
    spectrum
  • What is the name of galaxy on earth?
    Milky way
  • What is non luminous objects?
    the object does not emit its own light
  • When the light enters more dense medium (e.g. from air into glass), it bends ________ the normal. ( away or toward?)
    toward
  • In the diagram, which letter represents the angle of incidence?
    D
  • what are primary colours of light?
    Red, Green, Blue
  • ________________ are objects used to bend and split the color of light.
    Prism
  • The closest known galaxy to the Milky Way is called .....
    the Canis Major Dwarf Galaxy
  • Rainbow is an example of
    Refraction and dispersion
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