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GATE 2022 CH – Question 5

General Aptitude · Spatial Aptitude: Spatial Reasoning and Visualization · 1 mark · Multiple choice

A building has several rooms and doors as shown in the top view of the building given below. The doors are closed initially.
What is the minimum number of doors that need to be opened in order to go from the point P to the point Q?

a square building plan with a room at the bottom containing P, a larger central area with a vertical wall that has a door, and a small room in the upper middle with doors on its two sides. Q is in the upper right part. Arrows from the label "door" point to the doors.
  1. 4
  2. 3
  3. 2
  4. 1

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Show answer and explanation

Correct answer: (C) 2

Explanation

From P, the only way out of the bottom room is through the door in its upper wall. That leads to the region on the left of the vertical wall. The second door, in that vertical wall, leads to the right-hand region, from which Q can be reached through the opening at the end of the partial wall. So 2 doors have to be opened.