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Question
State one use of a screw gauge.
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Solution
A screw gauge is used for measuring diameter of circular objects mostly wires with an accuracy of 0.001 cm.
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RELATED QUESTIONS
Name the two scales of a vernier callipers and explain how it is used to measure length correct up to 0.01 cm.
In the vernier callipers, there are 10 divisions on the vernier scale and 1 cm on the main scale is divided into 10 parts. While measuring the length, the zero of the vernier lies just ahead of the 1.8 cm mark and the 4th division of vernier coincides with a main scale division.
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(b) If zero error of vernier callipers is -0.02 cm,
What is the correct length ?
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Negative zero error
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