Question

While measuring length using a ruler,
the position of your eye should be
a) Left side of the point.
b) Vertically above the point wherethe measurement is to be taken.
c) Right side of the point
d) Any where according to one’s convenience.

Answer 1

While measuring length using a ruler the position of your eye should be
(b) Vertically above the point where the measurement is to be taken. 

If the eyes are at different positions, one might get wrong readings.
Length can also be measured with the help of a Divider. 

A curved line can be measured with that of a String.

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Answer 2

Answer:

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Explanation:

For taking measurements, correct position of the eye is very important. The I must be exactly vertically above the mark to be read. In other positions of the eye, pte reading due to wrong positioning of eye is called parallax error.