Question

On which end of a circle, the zero is marked in a prismatic compass?

• A. East end
• B. North end
• C. South end
• D. West end

Hint:

Remember: In a prismatic compass, the graduations start from the south (0°) and go clockwise, which is different from the surveyor’s compass.

Answer 1

The Correct Option is C

Step 1: Understand the prismatic compass system
In a prismatic compass, the graduated circle is attached to the magnetic needle and rotates with it. The readings are taken through a prism, which allows accurate viewing.
Step 2: Observe the graduation direction
The circle is graduated from \(0^\circ\) to \(360^\circ\) in a clockwise direction. Unlike a surveyor's compass, the prismatic compass has 0° at the South end, 90° at the West, 180° at the North, and 270° at the East.
Step 3: Final Interpretation
Since the zero marking is at the South end of the graduated circle, the correct answer is:
South end.
Final Answer: (3) South end