Question

The quadrantal bearing of a line is directly observed by:

• A. Prismatic compass
• B. Surveyor's compass
• C. Celestial observations
• D. Magnetic declination

Hint:

Remember: Prismatic Compass $\to$ Whole Circle Bearings, Surveyor's Compass $\to$ Quadrantal Bearings.

Answer 1

The Correct Option is B

Step 1: Understanding Quadrantal Bearing System.
Quadrantal bearings (also called reduced bearings) are measured with respect to the North or South direction towards East or West, restricted to $0^\circ$ to $90^\circ$.

Step 2: Observation instrument.
The Surveyor's Compass is designed to directly measure quadrantal bearings. On the other hand, the Prismatic Compass directly reads whole-circle bearings.

Step 3: Analysis of options.
- (A) Prismatic compass: Measures whole circle bearings, not quadrantal.
- (B) Surveyor's compass: Directly gives quadrantal bearings.
- (C) Celestial observations: Used for astronomical bearings, not quadrantal.
- (D) Magnetic declination: It's a correction, not an observation method.

Step 4: Conclusion.
The quadrantal bearing is directly observed using a Surveyor's Compass.