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Q: Which is not suitable for setting out right angles to another line
  • A. Telescopic Alidade
  • B. Prism square
  • C. Open Cross staff
  • D. Sextant
Correct Answer: Option A - There are several types of instruments used to set out a right angle to a chain line, the most common being. (i) Cross staff- • open cross staff • french cross staff (ii) optical square (iii) prism square (iv) site square • Box sextant may be used as an optical square.
A. There are several types of instruments used to set out a right angle to a chain line, the most common being. (i) Cross staff- • open cross staff • french cross staff (ii) optical square (iii) prism square (iv) site square • Box sextant may be used as an optical square.

Explanations:

There are several types of instruments used to set out a right angle to a chain line, the most common being. (i) Cross staff- • open cross staff • french cross staff (ii) optical square (iii) prism square (iv) site square • Box sextant may be used as an optical square.