Physics
According to the Second Law of Motion, for a given force, acceleration is inversely proportional to the ________ of an object.

Mass
Density
Force
Volume

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Physics
Ice is packed in saw dust because

Saw dust is poor conductor of heat.
Saw dust is a good conductor of heat.
Saw dust does not stick to the ice.
Saw dust will not get melted easily.

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

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

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