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Which of the following measurements is most accurate? (a) 0.005 mm (b) 5.00 mm (c) 50.00 mm (d) 5.0 mm

Which of the following measurements is most accurate?
(a) 0.005 mm 
(b) 5.00 mm
(c) 50.00 mm
(d) 5.0 mm

Grade:12

1 Answers

Biswajit Das
askIITians Faculty 55 Points
8 years ago
There is no way to determine the accuracy of a measurement unless we know the exact value of the quantity that we are measuring.

Suppose you are measuring a line whose actual length is 5mm, then 4.9mm is a more accurate measurement than 4.8mm but it is a less accurate measurement than 5mm.

A common misconception is that 5.00mm is a more accurate measurement than 5mm and 5.0mm. But it is wrong.
The correct statement would be "5.00mm is a more precise measurement than 5mm and 5.0mm".

But as far as accuracy is concerned, 5.00mm, 5.0mm, 5mm are all the same.

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