Physics
The sky appears blue because of

Scattering of light
Emision of blue wavelength by the sun
Atmospheric water vapour
Reflection on sea water

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Physics
A balloon filled with hydrogen will

Reach a particular height and remain floating
Reach a particular height and start coming down
Continue going upwards uninterrupted
Burst after reaching some height

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Physics
Air moves from the region where the air ________

Pressure is low to the region where the pressure is high
Pressure is high to the region where the pressure is low
Humidity is low to the region where the humidity is high
Humidity is high to the region where the humidity is low

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