Question

The side of a cube is $2.5$ metre, the volume of the cube to the correct significant figures is :

• A. 15
• B. 16
• C. 1.5
• D. 1.6

Answer 1

The correct option is B 16

Given, side of the cube $a=2.5m$

So the volume of the cube $=a^3={2.5}^3=15.625m^3$

Result of an operation has maximum number of significant figures is equal to the least significant operator.

As side of the cube has two significant figures, so volume of the cube must be expressed to two significant figures. Thus, the volume to correct significant figures is $16m^3$