GATE CE 2021 Set 1 — Question 27
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Geomatics Engineering → Distance & Angle Measurement → Bearings & Azimuths
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Question
Which of the following is/are correct statement(s)?
Correct answer
(A) Back Bearing of a line is equal to Fore Bearing ± 180^.; (B) If the whole circle bearing of a line is 270^, its reduced bearing is 90^ NW.; (C) The boundary of water of a calm water pond will represent contour line.
Solution
(A) Correct: By definition, .
(B) Correct: A Whole Circle Bearing (WCB) of points exactly West. In the Quadrantal Bearing (Reduced Bearing) system, this is represented as or NW.
(C) Correct: A calm water surface is a level surface. Its intersection with the ground (the shoreline) consists of points at the same elevation, thus forming a contour line.
(D) Incorrect: In stadia tachometry, the horizontal distance is given by , where is the staff intercept. Therefore, . As the distance decreases (staff held nearer), the staff intercept also decreases, not increases.
(B) Correct: A Whole Circle Bearing (WCB) of points exactly West. In the Quadrantal Bearing (Reduced Bearing) system, this is represented as or NW.
(C) Correct: A calm water surface is a level surface. Its intersection with the ground (the shoreline) consists of points at the same elevation, thus forming a contour line.
(D) Incorrect: In stadia tachometry, the horizontal distance is given by , where is the staff intercept. Therefore, . As the distance decreases (staff held nearer), the staff intercept also decreases, not increases.
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