Describe in steps how would you measure the length of a pencil using a metre ruler. Draw a diagram if necessary. 

The diagram below shows a stick placed along a metre ruler. The length of the stick is measured keeping the eye at positions $\mathrm{A}, \mathrm{B}$ and$\mathrm{C}$. 

Write the length of stick $\mathrm{PQ}$ as observed, for each position of the eye. Are they all same ? 

The diagram below shows a stick placed along a metre ruler. The length of the stick is measured keeping the eye at positions $\mathrm{A}, \mathrm{B}$ and$\mathrm{C}$. 

Which is the correct position of the eye ? Write the correct length of the stick.

Convert the following quantities as indicated : 

$2500 \mathrm{kg} =$ _____  $\mathrm{metric} \mathrm{tonne}$.

Convert the following quantities as indicated : 

$150 \mathrm{kg}=$_____ $\mathrm{quintal}$.

Convert the following quantities as indicated : 

$10 \mathrm{lb}=$_____  $\mathrm{kg}$.