Question

For a proving ring used in a press, the value of force and its uncertainty are given as $12355\pm 2354N$ without any rounding off. If the error should be rounded off at the maximum to two significant figure only, the value of the reading is rounded off as

• A. $12300\pm 2300N$
• B. $1230\pm 2350N$
• C. $12400\pm 2300N$
• D. $12400\pm 2400N$

Answer 1

The correct option is D $12400\pm 2400N$

Given,
$F=12355\pm 2354N$

Now rounding off at the maximum to two significant figure,

$F=12400\pm 2400N$