edited by
7,977 views
24 votes
24 votes

An air pressure contour line joins locations in a region having the same atmospheric pressure. The following is an air pressure contour plot of a geographical region. Contour lines are shown at $0.05$ bar intervals in this plot.

If the possibility of a thunderstorm is given by how fast air pressure rises or drops over a region, which of the following regions is most likely to have a thunderstorm?

  1. $P$
  2. $Q$
  3. $R$
  4. $S$
edited by

5 Answers

Best answer
24 votes
24 votes

More Pressure gradient (variation of pressure) causes more thunderstorm possibility. In the region, $R$ contour lines are very dense and giving more pressure gradient (notice two of them are very close). ( $\frac{\partial P}{\partial x},\frac{\partial P}{\partial y}$ , one of these values will be very high in comparison to other regions).

$R$ is the answer. 

selected by
11 votes
11 votes
Since the air pressure variation is the factor for the thunderstorm to occur so the region which has max number of lines crossing , depicts that region has a larger variance of air pressure, hence as per the contour figure no. of lines crossing region 'R' is max, hence R should be the answer.
6 votes
6 votes
In this Set 2 question , here value of air pressures are :-
P = 0.95 , Q= 0.8 , S = 0.95 , R= 0.65
now the possibility of thunderstorm says how fast the value rises or how quickly the value drops .

P and S have same value. i can obsolete these 2 options.

So now only 2 options left , among them Q have average value .

Only R have Minimum value   ,  now only Minimum Value can drop quickly  , hence R can be the region have most likely to get a thunderstorm.

Which is option  C .
4 votes
4 votes
As possibility of a thunderstorm is given by how fast air pressure rises or drops over a region, the answer must be a region where pressure variation throughout the region is maximum. Clearly. the region R has 4 air contour lines through it, which means maximum pressure variation. So, R is the answer.
Answer:

Related questions

35 votes
35 votes
4 answers
4
Arjun asked Feb 14, 2017
12,908 views
The number of roots of $e^{x}+0.5x^{2}-2=0$ in the range $[-5,5]$ is$0$$1$$2$$3$