Question

For measuring a curve line which of the following can be used?

• A. A non-stretchable string
• B. A thread with a knot at one of it's ends.
• C. A straight rod
• D. Both A and B

Answer 1

Answer: (D)

Both A and B

Since the line to be measured is curved it can not be measured by a straight rod . It can be measured by any scale which can bent and not stretch.So Either a non-stretchable string or a thread with a knot at one of its ends can be used for measuring the curved line. But a curved line cannot be measured with a straight rod.