Difference between Prismatic Compass and Surveyor’s Compass
| No. | Basis | Prismatic Compass | Surveyor’s Compass |
|---|---|---|---|
| 1 | Method of Taking Reading | Reading is taken with the help of a prism. | Reading is taken from the top of the box. |
| 2 | Direction of Needle | The north end of the needle points towards the north. | The south end of the needle points towards the north. |
| 3 | Position of Circle | The graduated circle rotates, and the needle remains stationary. | The needle rotates, while the circle remains stationary. |
| 4 | Type of Bearing | Gives Whole Circle Bearing (0°–360°). | Gives Quadrantal Bearing (0°–90°). |
| 5 | Least Count | 0.5° (more precise). | 15 minutes (less precise). |
| 6 | Accuracy | More accurate. | Less accurate. |
| 7 | Use | Used for engineering and precise survey work. | Used for rough or ordinary survey work. |
🧠 Important Expected Questions
🔹 Objective / MCQ Type
1️⃣ Reading in Prismatic Compass is taken by —
👉 (a) Prism ✅
👉 (b) Top of the box
👉 (c) Mirror
👉 (d) Telescope
2️⃣ In Surveyor’s Compass, which end of the needle points to the north?
👉 (b) South end ✅
3️⃣ In Prismatic Compass, which circle rotates?
👉 (b) Graduated circle ✅
4️⃣ Surveyor’s Compass gives which type of bearing?
👉 (b) Quadrantal Bearing ✅
5️⃣ Least count of Prismatic Compass is —
👉 (b) 0.5° ✅
6️⃣ Which compass is more accurate?
👉 (a) Prismatic Compass ✅
🔹 Descriptive / Theory Questions
1️⃣ Write the difference between Prismatic Compass and Surveyor’s Compass. (5 or 7 marks)
2️⃣ Explain the Principle and Construction of Prismatic Compass.
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