What is the unit of the vernier scale reading?

Q. How the vernier scale reading is calculated

Q. In a Vernier Calipers, \(10\) divisions of Vernier scale is equal to the \(9\) divisions of main scale. When both jaws of Vernier calipers touch each other, the zero of the Vernier scale is shifted to the left of zero of the main scale and \(4^{th}\) Vernier scale division exactly coincides with the main scale reading. One main scale division is equal to \(1~\text{mm}\). While measuring diameter of a spherical body, the body is held between two jaws. It is now observed that zero of the Vernier scale lies between \(30\) and \(31\) divisions of main scale reading and \(6^{th}\) Vernier scale division exactly coincides with the main scale reading. The diameter of the spherical body will be

Q. The least count of vernier caliper is the ratio of the smallest reading on main scale and number of divisions on vernier scale.

Q. In a Vernier calipers, one main scale division is
m cm and n divisions of Vernier scale coincides with (n – 1) divisions of the main scale. Minimum reading that can be taken from this Vernier caliper is

Q. In a vernier calipers having 10 VSD, the vernier constant is 0.1 mm. When the jaws are closed, zero of vernier lies to the left of zero of mainand $7^{th}$ Vsd coincides with a main scale division. When a cylinder is placed between the jaws the main scale reading was 7.7 cm and vernier scale read 8 divisions. What is the diameter of the cylinder ?