GATE CS 2017 Set 1 — Question 65

MCQ+2 / -0.67MediumData Interpretation (Bar, Pie, Graphs, Tables)Quantitative AptitudeGeneral Aptitude

General Aptitude → Quantitative Aptitude → Data Interpretation (Bar, Pie, Graphs, Tables)

Last updated 5 September 2026

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?

Correct answer (C) R, S, T Solution Contour lines are drawn every 25 m, so between two labelled lines that differ by 50 m there is exactly one unlabelled line at the intermediate height. A village is submerged if its height is below 525 m. 1. P sits inside the innermost loop of the left hill. Moving inwards from the line labelled 500 we cross 525, then the line labelled 550, then the innermost loop (575). So P is above 575 m — not submerged . 2. Q lies on the right hill, inside the line that runs from the top edge down to the right edge just above T (the 525 m line, since the next line outward is labelled 500) and outside the ring labelled 550. So Q is between 525 m and 550 m — not submerged . 3. T lies between the line labelled 500 and that 525 m line, so it is between 500 m and 525 m — submerged . 4. R lies in the upper middle, outside the 500 m loop of the left hill, in the band between the 450 m and 500 m lines, so its height is below 500 m — submerged . 5. S lies in the small closed depression marked 450 inside the 500 m region, so it is below 500 m — submerged . Hence R, S and T are submerged; P and Q stay above water. (A) P, Q — these are exactly the two villages that stay dry. (B) P, Q, T — P and Q are not submerged. (C) R, S, T — correct. (D) Q, R, S — Q is above 525 m and T is missing. Answer: (C) R, S, T Turn this into a strength. Explore AI-powered practice and doubt support with Success Tracker.

Review answer and solution without JavaScript

Interactive answer checking needs JavaScript. The published solution is available below.

Correct answer (C) R, S, T Solution Contour lines are drawn every 25 m, so between two labelled lines that differ by 50 m there is exactly one unlabelled line at the intermediate height. A village is submerged if its height is below 525 m. 1. P sits inside the innermost loop of the left hill. Moving inwards from the line labelled 500 we cross 525, then the line labelled 550, then the innermost loop (575). So P is above 575 m — not submerged . 2. Q lies on the right hill, inside the line that runs from the top edge down to the right edge just above T (the 525 m line, since the next line outward is labelled 500) and outside the ring labelled 550. So Q is between 525 m and 550 m — not submerged . 3. T lies between the line labelled 500 and that 525 m line, so it is between 500 m and 525 m — submerged . 4. R lies in the upper middle, outside the 500 m loop of the left hill, in the band between the 450 m and 500 m lines, so its height is below 500 m — submerged . 5. S lies in the small closed depression marked 450 inside the 500 m region, so it is below 500 m — submerged . Hence R, S and T are submerged; P and Q stay above water. (A) P, Q — these are exactly the two villages that stay dry. (B) P, Q, T — P and Q are not submerged. (C) R, S, T — correct. (D) Q, R, S — Q is above 525 m and T is missing. Answer: (C) R, S, T

Continue learning with Success Tracker

Use Success Tracker to ask about the reasoning, then try another GATE CS question to check your understanding.

AI-powered practice· Unlimited practice on eligible plans

PYQs with solutions: Attempt available previous-year questions, then compare your reasoning with the worked solution. Coverage varies by stream.
Practice that adapts: Choose a topic, work on weaker areas and bookmark questions to revisit. Your attempts feed your progress tracking.
AI doubt support: Ask follow-up questions about a step or concept while practising, instead of stopping at the final answer.

Unlimited practice is available on eligible plans. Free practice and AI usage have limits; check the current plan allowances before choosing.

This page stays readable without an account. AI responses can be wrong; check them against the solution and source material.