Question

Which of the following measurement is most precise?(a) 5.00 mm(b) 5.00 cm(c) 5.00 m(d) 5.00 km

Answer 1

The measurement accuracy is very important in the scientific research and experimental works.

To calculate the most precise length measurements,we have to turn the four mentioned measurements into scientific notation of 10¹

5km=5000000 mm= 500000×10¹ mm

5cm=50 mm= 5×10¹mm

5 m= 5000mm = 500×10¹mm

5mm=0.5×10¹mm

In these four notations the maximum number of digits are obtained by 5km.

That's why 5km is the most precise measurement.

Answer 2

Answer:

Option a is the answer because 5.00mm is more precise

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