Which of the following pair of quantities do not have the same dimensions?
Light year,distance
Light year,time period
Impedance,resistance
None of these
A
Light year,distance
B
Impedance,resistance
C
Light year,time period
D
None of these
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Solution
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The correct option is A Light year,time period Light year is the unit of astronomical distance. It is equal to the distance travels by light in a year. So its dimension is [L].
The dimension of time period is [T]
As impedance and resistance both have same unit, ohm so they will have same dimension.
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