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Question
What do you understand by the term least count of screw?
Solution
Least distance of the screw is defined as the smallest distance moved by its tip when the screw turns through one division marked on it.
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RELATED QUESTIONS
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
Thickness of a pencil.
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.
(a) Find the length.
(b) If zero error of vernier callipers is -0.02 cm,
What is the correct length ?
Up to how many decimal places can a common vernier callipers measure the length in cm?
State the formula for determining a pitch
Which part of vernier callipers is used to measure the internal diameter of a hollow cylinder?
State whether the following statement is true or false by writing T/F against it.
The least count of a screw gauge can be lowered by increasing the number of divisions on its thimble.
What is the least count in the case of the following instrument?
vernier calipers
The following diagrams (Fig. 5) show the use of a vernier caliper under three different situations. Study the diagrams carefully and note down the vernier readings in each case.
(a) Measuring the diameter of the rod
(b) Measuring Internal diameter of a cavity
(c) Measuring depth of a cavity
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.
