1.

Which of the following are not a unit of time ?

Answer»

Second
Parsec
YEAR
Light year

Solution :We know that 1 light year`= 9.46 xx 10^(11) m`
= distance that light travels in 1 year with speed
`3xx10^8 m//s`
1 parsec = `3.08 xx 10^(6)` m
= Distance which AVERAGE radius of earth.s orbit subtends an angle of 1 parasecond Here, Second and year REPRESENT time.


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