Question

the length of two rods by a metre scale are 50 cm and 20 CM respectively between these two measured value which measurement is more accurate and which measurement is more precise​

Answer 1

Explanation:

The length of two rods that are measured by a metre scale are 60.0 cm and 20.0 cm respectively. The least count of metre scale is 1 mm, so then which measurement is more accurate?

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Given scale is a meter scale, that means it has a count of 1000 mm with a resolution of 1 mm.

Accuracy is 100% if one say the reading is 600 mm or 200 mm, but an information is lost every time in moving the most significant digit or in scale conversion. It can be 599 mm but we round it to 60 cm. It depends on our adaption of that flexibility in rounding off the value. We say it x % of fsd [full scale reading].

Accuracy = (How much the fsd is scaled by the reading) ∗ (x) %

Here, Accuracy = 1000600 or 200∗x %

and if the least count is 1 cm,

Accuracy = 10060 or 20∗x %

So, both 60 cm and 20 cm are not reliable until it is explicitly said 600 mm or 200 mm.