1. What is least count?(1)
2. Write the name of each part of the Vernier caliper and state it's function. (8)
3. What is the formula to calculate least count?
(1)
4. Solve the following numericals
1. The diameter of a steel ball is measured using vernier scale. It has 10 division on the Vernier scale and it calibrated at 1 mm. The zero of the Vernier scale co incide with the 7 mm on main scale. And the 6 division of vernier scale coincide with 19th mm mark on main scale.
A. Calculate the least count.
B. What is the diameter of the steel ball. (3)
2.
The diameter of a cylinder is measured using a Vernier callipers with no zero error. It is found that the zero of the Vernier scale lies between 5.10 cm and 5.15 cm of the main scale. The Vernier scale has 50 divisions equivalent to 2.45 cm. The 24th division of the Vernier scale exactly coincides with one of the main scale divisions. The diameter of the cylinder will be?(3)
3.
The main scale of a vernier callipers is calibrated in mm and 19 divisions of main scale are equal in length to 20 divisions of vernier scale. In measuring the diameter of a cylinder by this instrument, the main scale reads 35 divisions and 4th division of vernier scale coinsides with a main scale division. Find:
(i). Least count
(ii). Radius of cylinder(3)
(i). Least count
(ii). Radius of cylinder(3)
iii) if it has error of +0.005 mm. Calculate the correct reading
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