Physics
Hydroscope is an instrument that shows changes in:

Density of liquid
Atmospheric humidity
Sound under water
None of these

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Physics
Acceleration is

Inversely proportional to mass
Directly proportional to mass
Inversely proportional to force
Directly proportional to force

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Physics
Superconductors are those elements

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

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