Question

Virat is given the task of measuring a snake-like steel rod which looks like the figure shown below.

Which of the following instruments should he use for the measurement?

• A. A metre scale.
• B. Pieces of marbles with known dimensions.
• C. A thread of known length.
• D. A compass.

Answer 1

The correct option is C

A thread of known length.

Virat cannot use a metre scale as it cannot be bent along the curve. If he uses pieces of marbles, there will always be some gaps left between two marbles. So the measurement will not be accurate.
A thread of known length can be used accurately to measure the required length as shown in the diagram below.