State the correction if the positive error is 7 divisions when the least count is 0.01 cm.

Numerical

When positive error is 7 divisions and L.C. is 0.01 cm
Then correction = – (+ 7 × L.C.)
= −7 × 0.01 cm
= – 0.07 cm

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Chapter 1 Measurements and Experimentation
Unit 3 Exercise 3 | Q 7.3

Which of the following measures a small length to high accuracy : metre rule , vernier callipers or screw gauge?

How can the least count of a screw gauge be decreased?

The thimble of a screw gauge has 50 divisions for one rotation. The spindle advances 1 mm when the screw is turned through two rotations.

What is the pitch of the screw?
What is the least count of screw gauge?
When the screw gauge is used to measure the diameter of wire the reading on the sleeve is found to be 0.5 mm and reading on thimble is found, 27 divisions. What is the diameter of the wire in centimetres?

What do you understand by the following term as applied to micrometre screw gauge?

Sleeve scale

How do you account for negative zero error, for calculating the correct diameter of wires?

Define the least count of an instrument.