The least count of the main scale of a vernier callipers is 1mm. Its vernier scale is divided into 10 divisions and coincide with 9 divisions of the main scale. When jaws are touching each other, the 7th division of vernier scale coincides with a division of main scale and the zero of vernier scale is lying right side of the zero of main scale. When this vernier is used to measure length of a cylinder the zero of the vernier scale is between 3.1cm and 3.2cm and 4th VSD coincides with a main scale division. The length of the cylinder is (VSD is vernier scale division)

Moderate

Solution

As zero of vernier scale is to the right of zero of main scale, error is +ve.
least count = $M S D - V S D = 0.1 m m$
Positive zero error $= 7 \times (L C) = 0.7 m m$
Measured length $= 31 m m + 4 (L . C) = 31.4 m m$
$l = 31.4 m m - 0.7 m m = 30.7 m m = 3.07 c m$

Get Instant Solutions

When in doubt download our app. Now available Google Play Store- Doubts App

Recieve an sms with download link

SCAN ME