Question

Sudden fall of atmosphere pressure in a large amount indicates

• A. storm
• B. rain
• C. fair weather
• D. cold waves

Answer 1

The correct option is A storm

Bernoulli's equation gives us the relation:
$P_1+\frac{1}{2}\rho v_1^2=P_2+\frac{1}{2}\rho v_2^2$
If $P_0$ is atmospheric pressure, (stagnation).
$P_0=P_1+\frac{1}{2}\rho v^2$
$\sqrt{\frac{2(P_0-P_1)}{\rho }}=v$
If $P_1$ is lesser, this indicates a sudden fall of temperature.
Larger is the velocity of the flow, which indicates a storm.