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MCQ
The least count of a metre rule is 1 mm. The uncertainty in a single measurement made with it is best taken as:
Unit-1 Physical Quantities and Measurement
A Plus/minus 0.5 mm
B Plus/minus 1 mm
C Plus/minus 0.1 mm
D Plus/minus 5 mm
Explanation

For an instrument, the uncertainty in a single reading is usually taken as half of its least count, i.e. 0.5 mm.

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