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Light Shadows and Reflections Test - 14

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Light Shadows and Reflections Test - 14
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  • Question 1
    1 / -0
    A body which allows most of the light to pass through it is called a :
    Solution
    light can pass through a transparent body like glass
  • Question 2
    1 / -0
    A substance through which light can pass completely is called a/an
    Solution
    A substance is said to be transparent if light can pass easily through it. Example: glass
    A substance is said to be translucent if light passes only partially through it. Example: Butter paper
    A substance is said to be opaque if light does not pass through it. so, we can't see through these objects. Example: paper
  • Question 3
    1 / -0
    In a room lighted by an electric bulb, it is found that the shadow of the ceiling fan hung in the centre is falling on a wall opposite to the door. What can you say about the position of the bulb?
    Solution
    Answer is A.

    When we put any object in between the light source it forms a shadow of that object. The closer the object is to the source of the light, the more light it blocks out, so its shadow is bigger. But if the object is further away, it does not block out much light, and so the shadow is smaller.
    Therefore, for the shadow of the ceiling fan to be formed on a wall opposite to the door, the electric bulb must be positioned on the wall having the door.
  • Question 4
    1 / -0
    In a room lighted by an electric bulb, it is found that the shadow of the ceiling fan hung in the centre is falling on a wall opposite to the door. What can you say about the position of the bulb ?
    Solution
    Shadow is always formed in opposite side of the object and light source , hence position of bulb is on the wall having the door.
  • Question 5
    1 / -0
    A thin layer of water is transparent but a very thick layer of water is :
    Solution
    A thin layer of water is transparent as it allows the entire light to pass through it without any absorption or reflection. But a very thick layer of water is translucent as it may absorb a part of incident light.
  • Question 6
    1 / -0
    Shadows are formed due to:
    Solution
    Shadows are formed when an opaque object or material is placed in the path of rays of light. The opaque material does not let the light pass through it. The light rays that go past the edges of the material make an outline for the shadow.
  • Question 7
    1 / -0
    Which of the following body allows only a part of the light to pass through it?
    Solution
    Opaque objects do not allow light to pass through them. For example. wood and brick.
    Transparent objects allow light to pass through them and we can see through
    these objects clearly. For example, air.
    Translucent objects allow light to pass through them partially. For example, oiled paper.
  • Question 8
    1 / -0
    A medium which partially allows the light rays to pass through it is called -
    Solution
    Objects or medium which allow the light to pass through them completely without any obstruction are called transparent \bf{transparent} objects or medium.

    Objects or medium which do not allow the light to pass through them are called opaque\bf{opaque} objects or medium.

    Objects which do not emit light on their own are called  non−luminous \bf{non-luminous} objects.

    Objects or medium which allow the light to pass through them partially are called translucent \bf{translucent} objects or medium.

    Hence, the correct answer is OPTION D. 
  • Question 9
    1 / -0
    Glass allows light to pass through it because it is -
    Solution
    Objects which allow the light to pass through them completely without any obstruction are called transparent \bf{transparent} objects.
    Objects which do not allow the light to pass through them are called opaque\bf{opaque} objects.
    Objects that give out or emit light of their own are called luminous \bf{luminous} objects.
    Objects which do not emit light on their own are called non−luminous \bf{non-luminous} objects.

    Thus, glass allows light to pass through it because it is transparent.

    Hence, the correct answer is OPTION A.  
  • Question 10
    1 / -0
    Change in the direction of light when it falls on an object is called :
    Solution
    When a light ray strikes a mirror or surface or any object then it gets sent back into the medium from which it came.This is called reflection of light.The direction of light changes by reflection.Hence correct answer is reflection.
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