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Q: Which of the following instruments contains two telescopes that is used for setting out both straight lines and offset lines at 90º in chain survey?
  • A. Theodolite
  • B. Dumpy level
  • C. Site square
  • D. Tacheometer
Correct Answer: Option C - Site square– A site square, designed for setting out straight lines and offset lines at 900, consists of a cylinderical metal case containing two telescopes set at 900 to each other, a fine setting screw near the base, a circular spirit level at the top and a knurled ring at the base. It is used in conjunction with a datum rod screwed into the base of the instrument.
C. Site square– A site square, designed for setting out straight lines and offset lines at 900, consists of a cylinderical metal case containing two telescopes set at 900 to each other, a fine setting screw near the base, a circular spirit level at the top and a knurled ring at the base. It is used in conjunction with a datum rod screwed into the base of the instrument.

Explanations:

Site square– A site square, designed for setting out straight lines and offset lines at 900, consists of a cylinderical metal case containing two telescopes set at 900 to each other, a fine setting screw near the base, a circular spirit level at the top and a knurled ring at the base. It is used in conjunction with a datum rod screwed into the base of the instrument.