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Question

Which instrument is used to measure a road, a rail line or a river in a map?

A
Nephoscope
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B
Nephelometer
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C
Vernier caliper
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D
Opisometer
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Solution

The correct option is B Opisometer
Opisometer
An opisometer, also called a curvimeter, meilograph, or map measurer, is an instrument for measuring the lengths of arbitrary curved lines.

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