With the help of a normal ruler and a compass only, which of the following line segment is possible to construct?

2.1 c m

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4.2 c m

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5.43 c m

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3.3 c m

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Solution

The correct options are
A $2.1 c m$
B $4.2 c m$
D $3.3 c m$
Least count of normal scale is $.1 c m$ that is minimum length that can be measured using a normal scale is $.1 c m$ .
So the lengths that can be measured are
$2.1 c m, 4.2 c m$ and $3.3 c m$
To measure $5.43$ we need a scale whose least count is $.001$

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