Question

High speed winds are accompanied by –
A) Increased pressure
B) Reduced pressure
C) Water vapour
D) Static electricity

Answer 1

We need to understand the conditions that cause a wind in the atmosphere. The direction of wind and the magnitude or the strength with which it blows are dependent on many factors which can give us the required solution here.

Complete answer:
We know that the wind is the flow of air from a region of higher pressure to lower pressure. The movement of air is the carrier of rains, storms and cyclones which are necessary to some extent. The wind is solely responsible for the waves in the ocean which helps in sea navigation.
We need to understand what happens to a place where a strong wind blows. According to Bernoulli's principle, the velocity of a fluid at a place determines the fluid pressure in that place. The pressure exerted by the fluid on its container is directly proportional to the velocity of air in the container.
This is the reason why we are advised to stand away from the rail on a platform where fast trains are passing. When a train passes with high speed, the air near its proximity also moves with that high velocity. As a result, a low-pressure region is created between the person standing near the track and train which is sufficient to suck the person into the track causing a severe accident.
So, we understand that the high-speed winds are accompanied by reduced pressure regions.

So, the correct answer is option B.

Note:
The high-speed winds are capable of carrying away large objects due to this quality of them. While blowing they push the objects and as an after effect the low-pressure region sucks objects in the same direction making it nearly impossible to hold on.