Question:
A compact hand instrument used in setting out right angles with greater accuracy is known as
A compact hand instrument used in setting out right angles with greater accuracy is known as
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Optical square = $90^{\circ}$ angles. It’s faster and more accurate than using a 3-4-5 triangle for offsets.
Updated On: May 5, 2026
- Ranging rod
- Optical square
- Stadia
- Compass
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The Correct Option is B
Solution and Explanation
Step 1: Concept In surveying, it is often necessary to set out perpendicular lines (offsets) from a main survey line.
Step 2: Meaning While a cross-staff can be used, certain instruments provide higher precision using the principle of reflection.
Step 3: Analysis An optical square uses two mirrors or prisms set at an angle of $45^{\circ}$ to each other. By reflecting images, it allows the surveyor to see a point on the main line and a point at a $90^{\circ}$ angle simultaneously.
Step 4: Conclusion The optical square is the most accurate hand instrument for this purpose.
Final Answer: (B)
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