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
the moon

Answer 1

Answer:

AlR-Trarsparent.

Water-Translucent.

A piece of rock - opaque.

A sheet of alminium-opaque.

A mirror-opaque.

A wooden board - opaque.

A sheet of polythene- translucent.

A CD - Non Luminous.

Smoke- translucent.

A of small glass- transparent.

fog- translucent

A piece of red hot iron-opaque.

An umbrella-opaque.