Question

Which of the following are reasons why a rod cannot be used as a standard for measuring length?

• A. Its length changes with temperature
• B. It corrodes with time
• C. It is not easily reproducible
• D. All of the above

Answer 1

Answer: (A), (B), (C)

The correct options are
A

Its length changes with temperature

B

It corrodes with time

C

It is not easily reproducible

A rod expands when temperature increases and contracts when it decreases. It also corrodes with time and hence, it is not easy to make another rod of exactly the same length everywhere. Due to these reasons, a rod cannot be used as a standard for measuring length.