Which of the following is not a reading of meter scale?

2.5 c m

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15 c m

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1.5 m m

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0.4 m

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Solution

The correct option is D $1.5 m m$
Meter scale has least count $0.1 c m = 1 m m$ so reading should be $i n t e g r a l$ $m u l t i p l e$ of $1 m m$ .
$2.5 c m = 25 m m$ possible
$15 c m = 150 m m$ possible
$0.4 m = 400 m m$ possible
$1.5 m m = 1.5 \times 1 m m$ not possible because $1.5$ is not an $i n t e g e r .$

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