NDA 2019 Physics question

A student measures certain lengths using a meter scale having least count equal to 1 mm. Which one of the following measurements is more precise ?

(A)0·50 mm
(B)29·07 cm
(C)0·925 mCorrect
(D)910 mm

Answer: (C)

Solution

With a least count of 1 mm the scale can read only to the nearest millimetre, so 0.50 mm and 29.07 cm (which imply readings to 0.01 mm and 0.1 mm) cannot be taken with it. Of the two possible

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Question ID VK-031459