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Q.

Which of the following are examples of opaque materials?


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a

Coal

b

Cement

c

Wood

d

All of the above 

answer is D.

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Detailed Solution

Coal, wood, and cement are examples of opaque materials.
“Opaque materials completely block light from passing through it when light is focused on it”. Opaque material does not allow light to pass over. Hence, we are not able to see through it.
Some opaque materials are metal, mud, cement wall, wooden block, etc. A wooden block cannot pass light through, and a cement wall blocks the light inside a room.
 
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