Question: To measure the length of cylinder, a student uses the vernier calipers, whose main scale reads in mi...

Question

To measure the length of cylinder, a student uses the vernier calipers, whose main scale reads in millimeter and its vernier is divided into 10 divisions which coincide with 9 divisions of the main scale. He observed that when the two jaws of the instrument touch each other the eighth division of the vernier scale coincides with any one of the mains scale division and the zero of the vernier lies to the right of the zero of main scale. When he placed a cylinder tightly along its length between the two jaws the zero of the vernier scale lies slightly to the left of 42 mm and the fourth vernier division coincides with a scale division. The length of the cylinder measured by the student is-

Answer 1

Solution

41 + 4 × 0.1 – 0.8 = 40.6 mm = 4.06 cm