Question

The side of a cube is measured by a vernier calliper (10 divisions of a vernier scale coincide with 9 divisions of the main scale, where 1 division of the main scale is 1 mm). The main scale reads 10 mm and the first division of vernier scale coincides with the main scale. Mass of the cube is 2.736 g. Find the density of the cube inappropriate significant figures.

• A.
• B.
• C.
• D. None of these

Answer 1

The correct option is B

least count of vernier caliper = $\frac{1MSD}{\text{Number of VSD}}=\frac{1}{10}=0.1mm$

$\therefore$Side of cube =10mm + 1$\times$ 0.1mm = 1.01cm

Destiny = $\frac{2.736}{(1.01{)}^{3}c{m}^3}$ = $2.66\frac{g}{c{m}^3}$

Correct to 3 significant figures.