Physics
Why does ice covered in sawdust not melt quickly ?

Sawdust is good conductor of heat
Sawdust does not allow the air to touch the ice
Sawdust is a bad conductor of heat
The water is absorbed by sawdust

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Physics
Purpose of an optical filter is to

Reflect lights of different colours
Refract light of different colours
Dispense light into component colours
Transmit or absorb light of different colours

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