Question 4 of 70
When both jaws of vernier callipers touch each other, zero mark of the vernier scale is right to zero mark of main scale, mark on vernier scale coincides with certain mark on the main scale. While measuring the length of a cylinder, observer observes 15 divisions on main scale and division of vernier scale coincides with a main scale division. Measured length of cylinder is mm.
(Least count of Vernier calliper )
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Answer: (C) 15.1
Given Least Count () = mm.
When jaws touch, the zero of the vernier scale is to the right of the main scale zero, indicating a positive zero error.
Zero error () = , where is the coinciding vernier division.
mm.
While measuring the cylinder:
Main Scale Reading () = divisions.
Assuming MSD = mm (standard for mm), mm.
Vernier Scale Reading () = mm.
Observed Reading = mm.
True Measured Length = Observed Reading Zero Error
True Length = mm.
When jaws touch, the zero of the vernier scale is to the right of the main scale zero, indicating a positive zero error.
Zero error () = , where is the coinciding vernier division.
mm.
While measuring the cylinder:
Main Scale Reading () = divisions.
Assuming MSD = mm (standard for mm), mm.
Vernier Scale Reading () = mm.
Observed Reading = mm.
True Measured Length = Observed Reading Zero Error
True Length = mm.