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

Only II
All are correct
Only I and III
Only III

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Physics
Planets are

non-luminous heavenly bodies
luminous heavenly bodies that twinkle
luminous heavenly bodies revolving around a star
luminous heavenly bodies that do not twinkle

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