What is the purpose of a ratchet in a screw gauge?

One Line Answer

The ratchet is used in a screw gauge to hold the object under measurement gently between the studs.

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Chapter 1: Measurement - Exercise 2 [Page 29]

Chapter 1 Measurement
Exercise 2 | Q 8 | Page 29

The size of bacteria is 1 µ. Find the number of bacteria present in 1 m length.

Define the least count of vernier callipers. How do you determine it?

Name the part of the vernier callipers which is used to measure the following

External diameter of a tube

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

Baseline

State whether the following statement is true or false by writing T/F against it.

A metre scale can measure a length of 6.346 cm.

State whether the following statement is true or false by writing T/F against it.

The metre scale, vernier calipers, and screw gauge are in decreasing order of least count.

State whether true or false. If false, correct the statement.

With the help of vernier caliper we can have an accuracy of 0.1 mm and with screw gauge we can have an accuracy of 0.01 mm.