Question

Which of the following pair of quantities do not have the same dimensions?

• A. Light year,time period
• B. Light year,distance
• C. Impedance,resistance
• D. None of these

Answer 1

Answer: (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 $\left[L\right]$.

The dimension of time period is $\left[T\right]$

As impedance and resistance both have same unit, ohm so they will have same dimension.