JAMB - Physics (2018 - No. 40)
The inner diameter of a small test tube can be measured accurately using a
Micrometres screw gauge
Pair of dividers
Metre rule
Pair of vernier calliper
Vysvětlení
A vernier scale is a visual aid to take an accurate measurement reading between two graduation markings on a linear scale by using mechanical interpolation; thereby increasing resolution and reducing measurement