Physics
At what temperature do the Fahrenheit and Celsius scales give the same reading?

212 degrees
0 degreees
-40 degreees
32 degreees

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Physics
The blue colour of water in the sea is due to

Scattering of blue light by water molecules
Absorption of other colours except blue by water molecules
Reflection of blue light by impurities in sea water
Reflection of blue sky by sea water

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