Question

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, moon.

Answer 1

Answer:

Object Opaque Transparent Translucent Luminous Non-luminous

Air - Yes - - Yes

Water - Yes - - Yes

Piece of rock Yes - - - Yes

Sheet of aluminium Yes - - - Yes

Mirror Yes - - - Yes

Wooden board Yes - - - Yes

Sheet of polythene - - Yes - Yes

CD - - Yes - Yes

Smoke - - Yes - Yes

Sheet of plane glass - Yes - - Yes

Fog - - Yes - Yes

Piece of red hot iron Yes - - Yes -

Umbrella Yes - - - Yes

Lighted fluorescent tube Yes - - Yes -

Wall Yes - - - Yes

Sheet of carbon paper Yes - - - Yes

Flame of a gas burner - - Yes Yes -

Sheet of cardboard Yes - - - Yes

Lighted torch Yes - - Yes -

Sheet of cellophane - - Yes - Yes

Wire mesh - - Yes  Yes

Kerosene stove Yes - - Yes -

Sun Yes - - Yes -

Firefly Yes - - Yes -

Moon Yes - - - Yes

Explanation: