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Q: What is the function of a prism square used in a chain survey?
  • A. To set a line at right angles to a survey line
  • B. To mark survey stations in between survey lines
  • C. To check the alignment of a survey line
  • D. To get an enlarged view of the station marks
Correct Answer: Option A - Optical square– Optical square is some what more convenient and accurate instrument than the cross staff for setting out a line at right angles to another line. Prism square– The prism square works on the same principle as that of optical square. • It is more modern and precise instrument and is used in a similar manner. • It has the merit that no adjustment is required since the angle between the reflecting surfaces (i.e. 45⁰) cannot vary.
A. Optical square– Optical square is some what more convenient and accurate instrument than the cross staff for setting out a line at right angles to another line. Prism square– The prism square works on the same principle as that of optical square. • It is more modern and precise instrument and is used in a similar manner. • It has the merit that no adjustment is required since the angle between the reflecting surfaces (i.e. 45⁰) cannot vary.

Explanations:

Optical square– Optical square is some what more convenient and accurate instrument than the cross staff for setting out a line at right angles to another line. Prism square– The prism square works on the same principle as that of optical square. • It is more modern and precise instrument and is used in a similar manner. • It has the merit that no adjustment is required since the angle between the reflecting surfaces (i.e. 45⁰) cannot vary.