Question

The diagram shows a flood warning post in a river. Identify the water level shown in the diagram in cm.

• A. -20

Answer 1

The correct option is A -20
In the flood warning post, there are 5 divisions between 0 cm mark and - 50 cm.
$\Rightarrow$ Each division = $\frac{\left(}{-50}=\frac{50}{5}=10$ cm


As shown in figure, the water level is two divisions below the 0 cm mark.
$\therefore$ Current water level = $(-10)+(-10)=-20$ cm