Physics
Which of the following pair is Incorrect?I. Parsec - DistanceII. Barrel - LiquidIII. Light year - Time

Only I and III
Only II
Only III
All are correct

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Physics
Superconductors are those elements

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

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Physics
Solar eclipse will take place when

the sun is between the moon and the earth
the moon does not lie on the line joining the sun and the earth
the moon is between the sun and the earth
the earth is between the moon and the sun

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