Question

mention the precautions to be observed while measuring the length of a pencil a ruler​

Answer 1

the ruler should be clear i.e , the markings should be clear.

the ruler should have sharp edges

it should not be bent.

hope it helps

                       :)           :)

Answer 2

the precautions are:

1) the level of eye and level of scale mark should be perpendicular to each other

2)the zero of scale should coincide with starting point

3)it should be straight along the line