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Light, Shadows and Reflections | Exercises solution | Class 6| NCERT Science UPSC

1. Rearrange the boxes given below to make a sentence that helps us understand opaque objects.

OWS   A K E   O P A Q    U E O    B J E C    T S M

S H A D

Answer:

 OPAQUE  OBJECTS MAKE  SHADOWS 


2. Classify the objects or materials given below as opaque, transparent or translucent and luminous or non-luminous:

Air, water, a piece of rock, a sheet of aluminum, a mirror, a wooden board, a sheet of polythene, a CD, smoke, a sheet of plane glass, fog, a piece of red hot iron, an umbrella, a lighted fluorescent tube, a wall, a sheet of carbon paper, the flame of a gas burner, a sheet of cardboard, a lighted torch, a sheet of

cellophane, a wire mesh, kerosene stove, sun, firefly, the moon.

Answer:

opaque:

  •  a piece of rock, 
  • a sheet of aluminum,
  • a mirror, 
  • a wooden board,
  •  a CD,
  •  a wall,  
  • an umbrella,

  • a sheet of cardboard,

transparent: 

  • Air, 
  • water, 
  • a sheet of plane glass

translucent:

  • a sheet of polythene,
  •  smoke, 
  • fog,
  •  a sheet of carbon paper, 
  •  a sheet of cellophane,
  • ware mess

luminous: 

  • a piece of red hot iron, 
  • a lighted fluorescent tube,
  •  the flame of a gas burner,
  •  a lighted torch,
  •  kerosene stove, firefly,

non-luminous: 

  • Other than the luminous object mentioned above is the non-luminous objects

3. Can you think of creating a shape that would give a circular shadow if held in one way and a rectangular shadow if held in another way?

Answer:

  • The cylinder will give both circular and rectangular shadows.

4. In a completely dark room, if you hold up a mirror in front of you, will you see a reflection of yourself in the mirror?

Answer:

  • No. Image forms in the mirror by the reflection of light.


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