Physics
It is easier to carry two buckets of water in one hand each, than to carry only one in one hand because

Centre of gravity and centre of equilibrium fall within the feet
Resultant weight of buckets is zero
Weights of buckets are balanced
Centre of gravity falls within the body

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Physics
To prevent damage from lightning, lightning conductors are used on tall structures. The lightning conductor

Should be made of a good conductor but can be of any shape
Should be made of a good conductor like copper with sharp-pointed edges
Can be of any shape
Should be in the form of a vertical rod

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Physics
A white and smooth surface is

Bad absorber and bad reflector of heat
Bad absorber and good reflector of heat
Good absorber and good reflector of heat
Good absorber and bad reflector of heat

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