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Q.
Light year is a unit of:
AIIMSAIIMS 1996Physical World, Units and Measurements
Solution:
Light year is unit of distance. It is the distance that light can travel in one year. Light moves at a velocity of $ 3\times {{10}^{8}}\,m/s $ . So in one year it can travel about $10$ trillion kilometers. More precisely
$1$ light year $ =9.46\times {{10}^{15}}\,m $
It is abbreviated by light year. It is often used to measure distance of stars.