GK QUESTION#3097
Which statements about a light-year are correct? 1. It is a unit of distance. 2. Light itself is a unit of time. 3. It is the distance light travels in vacuum during one Julian year. 4. It measures luminous intensity.
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Answer
B. Only 1 and 3 are correct
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Explanation
A light-year is a distance, conventionally the distance light travels in vacuum during a Julian year. It is neither a time unit nor a measure of luminous intensity. Statements 1 and 3 are correct; the statement that light itself is a unit of time is false.