Concepts Of Physics MCQ Edition [Volume 1]PhysicsPhysics and Mathematics

Round the value 28.5 off to 2 significant digits.

Options

A30
B28.0
C29
D28

Correct answer

D. 28

Step-by-step solution

The given value is 28.5 . We need to round it off to 2 significant digits. The digit to be dropped is 5 . According to the rules of rounding off, if the digit to be dropped is 5 and is not followed by any non-zero digit, the preceding digit is left unchanged if it is even, and is increased by 1 if it is odd. Here, the preceding digit is 8 , which is an even number. Therefore, the value 28.5 is rounded off to 28 .

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