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Civil Engineering Objective Questions { Surveying }

99. To orient a plane table at a point P roughly south of the mid-point of two inaccessible conical hill stations A and B in the plains, a point C is selected in line with AB and table is oriented at C by bringing ab in line with AB. A ray is then drawn towards P and at P the table is oriented by back ray method. The orientation so obtained, is
A. unique and correct
B. incorrect
C. manifold and correct
D. not reliable.

100. Orientation of a plane table by solving two point problem is only adopted when
A. saving of time is a main factor
B. better accuracy is a main factor
C. given points are inaccessible
D. none of these.

101. Accuracy of 'fix' by two point problem, is
A. bad
B. good
C. not reliable
D. unique.

102. While working on a plane table, the correct rule is:
A. Draw continuous lines from all instrument stations
B. Draw short rays sufficient to contain the points sought
C. Intersection should be obtained by actually drawing second rays
D. Take maximum number of sights as possible from each station to distant objects.

103. If the plane table is not horizontal in a direction at right angles to the alidade, the line of sight is parallel to the fiducial edge only for
A. horizontal sights
B. inclined sights upward
C. inclined sight downward
D. none of these.

104. The smaller horizontal angle between the true meridian and a survey line, is known
A. declination
B. bearing
C. azimuth
D. dip.

105. The vertical angle between longitudinal axis of a freely suspended magnetic needle and a horizontal line at its pivot, is known
A. declination
B. azimuth
C. dip
D. bearing.

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