Question

Why do huge hoardings have holes in them?

• A. To increase the air pressure difference between the two faces of hoardings.
• B. To decrease the air pressure difference between the two faces of hoardings.
• C. Holes have no role in increasing or decreasing the air pressure difference.
• D. To give a fancy look to the hoarding.

Answer 1

The correct option is B To decrease the air pressure difference between the two faces of hoardings.

In windy conditions, the air pressure difference over the two faces of a hoarding can create a massive force. This force can easily topple or destroy the huge hoardings. Holes in the material allows the wind to pass through which greatly reduces the overall pressure difference on the structure.