2022 Units and MeasurementsSignificant Figures Medium Question 1 of 2 in Significant Figures

The area of a rectangular field (in $m^2$) of length 55.3 m and breadth 25 m after rounding off the value for correct significant digits is :

A $14\times10^2$
B $138\times10^1$
C 1382
D 1382.5

The answer is A.

Solution

Area = length × breadth = 55.3 × 25 = 1382.5 $m^2$ The result should have the least number of significant figures of the data, i.e. 2 (from 25). Area $= 14 \times 10^2\ m^2$

Concept significant figures in a product

Significant Figures in past papers

2 questions from this chapter have appeared across 2 exam years.