NEET 2022 — Physics solution

NEET2022Physics

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
1382
B
1382.5
C
$14 \times 1 0^{2}$
D
$138 \times 1 0^{1}$

Solution

Area $= 55.3 \times 25 = 1382.5$ m $^{2}$ .

Rule for multiplication: the answer should carry as many significant figures as the operand with the fewest. Here 25 has 2 significant figures and 55.3 has 3.

Rounding 1382.5 to 2 significant figures gives $14 \times 1 0^{2}$ m $^{2}$ .

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