Question

The length of a curved surface is measured by using

• A. metre scale only
• B. thread only
• C. both metre scale and thread
• D. none of these

Answer 1

The correct option is C both metre scale and thread

For the measuring of length of a curved surface, first take the measure of length using a thread and then find out the numerical value of that length of thread using scale. This numerical value will give the length of the curved surface. Thus, both thread and scale are used to find out the length of a curved surface.