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प्रश्न
What is meant by the pitch of a screw gauge? The pitch of a screw is 1 mm.
Find the reading of the instrument shown in the following figure.
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उत्तर
When one complete rotation is given to the screw hand, it moves forward or backward by a distance is called the pitch of the screw. It is a distance between two consecutive threads of the screw.
`"Pitch of the screw" = "distance travelled by screw in n rotations"/"n rotations"`
Pitch of the screw = 1 mm
No. of divisions on circular scale = 100
`"Least count" = "pitch"/"no. of divisions"` = 0.01 mm
Main scale reading = 3 mm
Circular scale division coinciding with the main scale = 42
Circular scale reading = 0.01 x 42 = 0.42
Final reading = 3 + 0.42 = 3.42 mm
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संबंधित प्रश्न
A screw gauge has a least count 0.001 cm and zero error +0.007 cm. Draw a neat diagram to represent it.
A screw gauge has 50 divisions on its circular scale and its screw moves by 1 mm on turning it by two revolutions. When the flat end of the screw is in contact with the stud, the zero of the circular scale lies below the base line and 4th division of the circular scale is in line with the base line. Find
(i) The pitch,
(ii) The least count and
(iii) The zero error of the screw gauge
A screw has a pitch equal to 0.5 mm. What should be the number of divisions on its head so as to read correctly up to 0.001 mm with its help?
What is the function of ratchet in the screw gauge?
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Stopwatch
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
A vernier caliper using the scale invented by Galileo.
