Question

(A): The coefficient of linear expansion of metal rod is $1.2\times {10}^{-6}{/}^{o}C$. If the length of the metal rod is measured in kilometer instead of $cm$, the $\alpha$ value is again $24\times {10}^{-6}{/}^{o}C$.

(B): $\alpha$ is independent of a unit of length.

• A. A and B are correct and B is correct
  explanation for A
• B. A and B are correct and B is not correct
  explanation for A
• C. A is true and B is false
• D. A is wrong and B is true

Answer 1

The correct option is D A is wrong and B is true

Since the coefficient of linear expansion is constant for material and it does depend upon unit taken to measure the length.

Therefore, B is a true statement but A is not true