GATE 2017 EE (EE2) – Question 10
An air-pressure contour joins points of equal atmospheric pressure. The plot has 0.05 bar contour intervals. If thunderstorm likelihood is determined by how fast pressure changes across a region, which marked region is most likely?
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Correct answer: (C) R
Explanation
Pressure-gradient magnitude is pressure change divided by distance. All adjacent contours differ by the same 0.05 bar, so a smaller gap between them means a larger gradient.
The contours are most tightly packed near R. The higher absolute pressures around P and S do not by themselves indicate a faster spatial change. Therefore **R, C**, is the region selected by the criterion stated in the question.
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