Question

Which of the following is not a unit of time?

A

hour

B

nano second

C

second

D

light year

Medium

Solution

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Correct option is
D

light year

Here, hour, nano second and microsecond are all the unit of time. 
1 hour second, one nano second second, one microsecond second
Light year is the unit of astronomical distance and it is equivalent to distance traveled by light in one year.  

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