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A vernier callipers has a zero error of + 0.06 cm. Draw a neat labelled 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
Define metre in terms of the wavelength of light.
Why is the metre length in terms of the wavelength of light considered more accurate?
Who invented vernier callipers?
State the formula for calculating length if:
Number of vernier scale division coinciding with the main scale and number of division of main scale on the left-hand side of zero of vernier scale is known.
Which part of vernier callipers is used to measure the internal diameter of a hollow cylinder?
An instrument that is used to measure the diameter of a cricket ball is ______.
