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Q: Optical square is used in __________ surveying.
  • A. Theodolite
  • B. Compass
  • C. Plane table
  • D. Chain survey
Correct Answer: Option D - Optical square–Optical square is used in chain surveying. • Optical square is somewhat more convenient and accurate instrument than the cross staff for setting out a line at right angle to another line.
D. Optical square–Optical square is used in chain surveying. • Optical square is somewhat more convenient and accurate instrument than the cross staff for setting out a line at right angle to another line.

Explanations:

Optical square–Optical square is used in chain surveying. • Optical square is somewhat more convenient and accurate instrument than the cross staff for setting out a line at right angle to another line.