Question

State some precautions to be taken while measuring length with the help of a metre scale.

Answer 1

Following are some precautions to be taken while measuring length with the help of a metre scale:
1. Scale must be placed in contact with the object along its length.
2. Eyes must be exactly perpendicular to the point where the measurement is to be taken, to avoid parallax error.
3. If the ends of a scale are broken/damaged we should avoid taking measurements from the end. Instead, we should place the object on any other fully visible mark on the scale (say, on 2 cm instead of 0). Then you must subtract the reading on this mark from the reading at the other end.