Question

state two precautions to be observed while measuring length with help of metre scale

Answer 1

To measure length with scale we should, 1) Keep the ruler exactly along the length to be measured 2)Avoid using worn out portions

Answer 2

Two precautions are: (i) The initial point of distance must coincide with the zero reading of metre scale. (ii) The eye should be kept in line with the point of measurement.