Question

Discuss the precautions that one should take while measuring length with a ruler.

Answer 1

The following precautions should be taken while measuring length with a ruler:
1. The ruler should be kept along the length of the object carefully.
2. Measurement should only be started from a mark that is fully clear. Example: If you measure from $3cm$ mark to the $7cm$ mark, the length is $4cm$ $(7-3=4cm).$
3. Eyes should be exactly above the point where the measurement is to be taken, otherwise, you might get faulty or inaccurate readings.