By using which of the following length of a curved line can be measured conveniently?
A
Measuring cylinder
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B
Thread and scale
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C
Weighing balance
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D
Spring balance
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Solution
The correct option is B Thread and scale Thread can be bent easily around the curved line. It can then be straightened on a scale to measure the length.
Hence, to measure the length of a curved line thread and scale can be used.