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Q: To set a right angle on a survey line, the instrument is held on
  • A. The tangent of the line with its centre at the mid-distance and parallel to the right angle.
  • B. The line with its centre on the point at which perpendicular is erected
  • C. The main station of survey line and away from the point at an intervisible distance.
  • D. The nearest tie station and placed at an intervisible distance
Correct Answer: Option B - To set a right angle– To set a right angle on a survey line, the instrument is held on the line with its centre on the point at which perpendicular is erected. • Optical square is somewhat more convenient and accurate instrument than the cross staff for setting out a line at right angles to another line.
B. To set a right angle– To set a right angle on a survey line, the instrument is held on the line with its centre on the point at which perpendicular is erected. • Optical square is somewhat more convenient and accurate instrument than the cross staff for setting out a line at right angles to another line.

Explanations:

To set a right angle– To set a right angle on a survey line, the instrument is held on the line with its centre on the point at which perpendicular is erected. • Optical square is somewhat more convenient and accurate instrument than the cross staff for setting out a line at right angles to another line.