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

32 degreees
-40 degreees
212 degrees
0 degreees

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Physics
The blue colour of sky is due to

Refraction of sunlight
Scattering of longer wavelengths of sunlight in the atmosphere
Scattering of shorter wavelengths of sunlight in the atmosphere
Reflection of sunlight

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