Arrange these places in decreasing order of their atmospheric pressure on their ground surface: 1. Shimla 2. Gangtok 3. Mumbai 4. Delhi

Answer: Option A

Atmospheric pressure is inversely related to altitude — it decreases as elevation increases.

Here is the correct order of the places in decreasing atmospheric pressure:

1. Mumbai (3) – Located at sea level, hence has the highest atmospheric pressure.

2. Delhi (4) – Situated in the plains at a moderate elevation, so pressure is slightly lower than Mumbai.

3. Shimla (1) – A hill station at a high altitude, so it has lower pressure than both Mumbai and Delhi.

4. Gangtok (2) – Located at a higher elevation than Shimla, thus has the lowest atmospheric pressure among the four.

Therefore, the correct decreasing order of atmospheric pressure is: 3 (Mumbai), 4 (Delhi), 1 (Shimla), 2 (Gangtok).