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Name the two scales of a vernier callipers and explain how it is used to measure length correct up to 0.01 cm.
Name the part of the vernier callipers which is used to measure the following
Thickness of a pencil.
Fig., below shows the reading obtained while measuring the diameter of a wire with a screw gauge. The screw advances by 1 division on the main scale when circular head is rotated once.
Find:
(i) Pitch of the screw gauge,
(ii) Least count of the screw gauge and
(iii) The diameter of the wire.
When does a vernier callipers has the positive error?
For what range of measurement is micrometre screw gauge used?
What do you understand by the following term as applied to micrometre screw gauge?
Sleeve cylinder
State the formula for calculating the pitch of screw.
How do you account for positive zero error for calculating the correct diameter of wires?
Define the least count of an instrument.
What is the zero error of a screw gauge?
