GATE CSE 2017 | Set 1 | GA | Question: 10

Question

A contour line joins locations having the same height above the mean sea level. The following is a contour plot of a geographical region. Contour lines are shown at $25$ m intervals in this plot. If in a flood, the water level rises to $525$ m, which of the villages $P, Q, R, S, T$ get submerged?

• A. $P, Q$
• B. $P, Q, T$
• C. $R, S, T$
• D. $Q, R, S$

Comments

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Isn't 475 < R < 500

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I interpreted just opposite of what is represented in contour...

Answer 1

Height of each place will be ( in meters)

 $600 > P >550,\quad     550 > Q > 525 ,\quad    500 >R > 450,\quad     450 > S > 425  ,\quad  525 >T> 500$

Only $R,S,T < 525$

Hence most suitable answer will be (c) R,S,T

These places will definitely be submerged if the water level rises to $525\;\text{m}.$

Comments

representing a 3d diagram on a 2d  plot is a really cool thing, thanks to this GATE question I became aware of it.

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For concept of contour plot,watch this video:

https://youtu.be/WsZj5Rb6do8

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Why Highest Height is 600?????/
i agree it is >575

Answer 2

This Contour Line problem with a graphical picture   asked in each set this year ( both set 1 and set 2 papers) . In both sets  questions are logical only .

No prior experience is required to solve them other than logical mind .

Now coming to this set 1 question,
given water level value is 525 m .

 600 > P >550,     550 > Q > 525 ,    500 >R > 450,     450 > S > 425  ,  525 >T> 500

now to get submerged the value should be Less than 525

that condition is satisfied by R, S, and T only . Because P and Q have above 525 value.

so the answer is R, S, T -- which is option C .

Comments

550 >Q>525

Answer 3

The villages which are below the flood level of 525m are clearly R (<500m), S(between 425m and 450m) and T(between 500m and 525m). So (C) is correct.

However, village P is above 575m and village Q is between 525m and 550m.

Answer 4

Sharing this approach if someone still finds it difficult to identify range, 

Any village with elevation < 525 m gets submerged.

 

Here, Elevation is reffered to the height of a point above the mean sea level

 

Now let's see one by one,

P = It is inside 550 so we can say that it's height > 525 m                              Hence, P will not submerged.
 

Q = It is seen close to 550 so we can say that it's height > 525 m                  Hence, Q will not submerged.
 

R = It is close to 450 and other layers are 500 each 

       so we can say that it's height < 525 m                                                      Hence, R will be submerged.
 

S = It is inside 450  so we can say that it's height < 525 m                              Hence, S will be submerged.

T = It is inside 500 but far than 550 so we can say that it's height < 525 m     Hence, T will be submerged.

 

Ans (C)