1. Rearrange the boxes given below to make a sentence that helps us understand opaque objects.
Answer
Opaque Objects Make Shadow
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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 aluminium, 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, moon.
Answer
Opaque objects : a piece of rock, a sheet of aluminium, a mirror, a wooden board, a CD, an
umbrella, a wall, a sheet of carbon paper, a sheet of cardboard
Transparent objects : Air, Water, a sheet of polythene, a sheet of plane glass, a sheet of
cellophane, a wire mesh
Translucent objects : smoke, fog
Luminous objects : A piece of red hot iron, a lighted fluorescent bulb, the flame of a gas burner,
a lighted torch, kerosene torch, sun, firefly
Non-luminous object : Air, water, a piece of rock, a sheet of aluminium, a mirror, a wooden
board, a sheet of polythene, a CD, smoke, a sheet of plane glass, fog, an umbrella, a wall, a sheet
of carbon paper, a sheet of cardboard, a sheet of cellophane, a wire mesh, moon.
