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Q: Which is one of the simplest instruments used to set out a right angle to a line chain?
  • A. Cross staff
  • B. Optical square
  • C. Site staff
  • D. Prism square
Correct Answer: Option A - Cross staff–The cross staff or an open cross staff is a simple instrument used for setting out offsets to the chain line from a given point. It is also used for setting out a right angle at a given point on the chain line and also used to locate the foot of the perpendicular from a given point to a line. • The accuracy of the French Cross Staff is less than that of an Open Cross Staff. Type of cross staff– (a) open cross staff (b) French cross staff (c) adjustable cross staff.
A. Cross staff–The cross staff or an open cross staff is a simple instrument used for setting out offsets to the chain line from a given point. It is also used for setting out a right angle at a given point on the chain line and also used to locate the foot of the perpendicular from a given point to a line. • The accuracy of the French Cross Staff is less than that of an Open Cross Staff. Type of cross staff– (a) open cross staff (b) French cross staff (c) adjustable cross staff.

Explanations:

Cross staff–The cross staff or an open cross staff is a simple instrument used for setting out offsets to the chain line from a given point. It is also used for setting out a right angle at a given point on the chain line and also used to locate the foot of the perpendicular from a given point to a line. • The accuracy of the French Cross Staff is less than that of an Open Cross Staff. Type of cross staff– (a) open cross staff (b) French cross staff (c) adjustable cross staff.