Physics
Superconductors are those elements

Which turn into insulators at very low temperatures
Which conduct electricity only at super-high temperatures
Whose conductivity is intermediate between metals and insulators
Whose resistance falls almost to zero at very low temperatures

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Physics
Two identical solid pieces, one of gold and other of silver, when immersed completely in water exhibit equal weights. When weighed in air (given that density of gold is greater than that of silver)

The gold piece will weigh more
Weighing will depend on their masses
The silver piece will weigh more
Both silver and gold pieces weigh equal

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