Question

Students A, B and C measure the diameter of a wire using three different screw gauges of least count 0.01 cm, 0.05 cm and 0.001 cm respectively. Each one makes 10 measurements.The measurements will be more precise for

• A. A
• B. B
• C. C
• D. all

Answer 1

The correct option is C C

For a screw gauge, the precision in measurement is depends on the least count. The smaller least count will give the more precision. Since student C has measured diameter using screw gauge with smallest least count so the measurement will more precise for student C.