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Question

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

Air, water, piece of rock, sheet of aluminium, mirror, wooden board, sheet of polythene, CD, smoke, sheet of plane glass, fog, piece of red hot iron, umbrella, lighted florescent tube, wall, sheet of carbon paper, flame of a gas burner, sheet of cardboard, lighted torch, sheet of cellophane, wire mesh, kerosene stove, sun, firefly, moon.

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Solution

Object

Object is Transparent/Translucent/Opaque

Object is Luminous/Non-luminous

Air

Transparent

Non-luminous

Water

Transparent

Non-luminous

Piece of rock

Opaque

Non-luminous

Sheet of aluminium

Opaque

Non-luminous

Mirror

Opaque

Non-luminous

Wooden board

Opaque

Non-luminous

Sheet of polythene

Translucent

Non-luminous

CD

Translucent

Non-luminous

Smoke

Translucent

Non-luminous

Sheet of plane glass

Transparent

Non-luminous

Fog

Translucent

Non-luminous

Piece of red hot iron

Opaque

Luminous

Umbrella

Opaque

Non-luminous

Lighted fluorescent tube

Opaque

Luminous

Wall

Opaque

Non-luminous

Sheet of carbon paper

Opaque

Non-luminous

Flame of a gas burner

Translucent

Luminous

Sheet of cardboard

Opaque

Non-luminous

Lighted torch

Opaque

Luminous

Sheet of cellophane

Translucent

Non-luminous

Wire mesh

Translucent

Non-luminous

Kerosene stove

Opaque

Luminous

Sun

Opaque

Luminous

Firefly

Opaque

Luminous

Moon

Opaque

Non-luminous


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