Physics
State the difference between positive and negative zero error of a screw gauge.
Answer
If on bringing the flat end of the screw in contact with the stud, the zero mark on the circular scale is below the base line of the main scale, the zero error is said to be positive and if the zero mark on the circular scale is above the base line of the main scale, the zero error is said to be negative.
Related Questions
State one use of a screw gauge.
State the purpose of ratchet in a screw gauge.
Name the instrument which can measure accurately the following —
- the diameter of a needle,
- the thickness of a paper,
- the internal diameter of the neck of a water bottle,
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Which of the following measures a small length to a high accuracy — metre rule, vernier callipers, screw gauge?