Question

The side of a cube is measured by vernier callipers (`10` divisions of a vernier scale coincide with `9` divisions of main scale, where `1` division of main scale is `1mm`). The main scale reads `10mm` and first division of vernier scale coincides with the main scale. Mass of the cube is `2.736 g`. find the density of the cube in appropriate significant figures.
A. `1.33gcm^(-3)`
B. `2.66gcm^(-3)`
C. `2.667gcm^(-3)`
D. `2.5gcm^(-3)`

Answer 1

Correct Answer - B
`LC=1 MSD-1 VSD=0.1mm`
`:.` side of the cube
`=10mm+1(0.1)=10.1mm=1.01cm`
`rho=(mass)/(volume)=(2.736)/((1.01)^(3))=2.066g//cm^(3)`