Question

A steel tape gives correct measurement at ${20}^{\circ }C$. A piece of wood is being measured with the steel tape at $0^{\circ }C$. The reading is 25 cm on the tape, the real length of the given piece of wood must be

• A. 25 cm
• B. < 25 cm
• C. > 25 cm
• D. cannot say

Answer 1

The correct option is B < 25 cm

When heated the length between adjacent markings increases. Hence the length measured will be less than 25 cm.