Physics
Boyle's law is a relationship between

Pressure and temperature
Volume and density
Volume and temperature
Pressure and volume

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

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

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Physics
What is the direction of torque?

Perpendicular to the direction of applied force
Opposite to the direction of applied force
Parallel to the radius
Same as the direction of applied force

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