Virat is given the task of measuring the length of a steel rod, and it looks like the following,

Which of the following objects/methods should he use to measure the length of the rod?

Meter scale

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Pieces of marbles whose length is known

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A thread of known length

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It is impossible to measure the length of a curved line

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Solution

The correct option is C
A thread of known length

Virat cannot use the meter scale directly as it cannot be bent along the curve. If he uses pieces of marbles, there will always be some gaps left between two marbles.

A thread can be used to trace the rod, and the meter scale can be used to measure the length of the thread stretched straight, thus finding the length of the rod.

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