First slide

Accuracy; precision of instruments and errors in measurements

Question

The length and breadth of a metal sheet are 3.124 m and 3.002 m, respectively. The area of this sheet upto correct significant figure is

Easy

A

$9.378 m^{2}$
B

$9.37 m^{2}$
C

$9.4 m^{2}$
D

None of these

Solution

$A = l \times b = 3.124 \times 3.002$
$= 9.378248 m^{2} = 9.378 m^{2}$ (rounding off to four significant digits)

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