Question

Statement 1: A rod can be used as a standard unit.

Statement 2: Length of the rod is not constant at all temperatures.

• A. Both the statements are false
• B. Statement 1 is false
• C. Statement 2 is true
• D. Both the statements are true

Answer 1

Answer: (B), (C)

The correct options are
B

Statement 1 is false

C

Statement 2 is true

A rod expands when temperature increases and contracts when it decreases. It also corrodes with time. It is not easy to make another rod of exactly the same length as that of the standard. Hence statement one is false and statement 2 is true.