Question

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

• A. $25cm$
• B. Less than $25cm$
• C. More than $25cm$
• D. $20cm$

Answer 1

The correct option is B Less than $25cm$

At ${20}^{\circ }\text{C}$ temperature steel tape measures correct measurement of wood.
Now at $0^{\circ }\text{C}$ length is $25cm$.
Since temperature is decreased, length of the steel tape will decrease.
So whatever we will measure will show more than the a actual length.
So the real length of wood must be less than $25cm$.