Question

Least count of Theodolite is

• A. 0.33 minutes
• B. 3.33 minutes
• C. 33.3 minutes
• D. 333 minutes

Hint:

20 seconds = 1/3 minute $\approx$ 0.33 minutes. Just remember "one-third" of a minute.

Answer 1

The Correct Option is A

Step 1: Concept The least count is the smallest value that can be accurately measured by a surveying instrument.

Step 2: Meaning Most standard vernier theodolites have a least count expressed in seconds or minutes of an arc.

Step 3: Analysis A common vernier theodolite has a least count of 20 seconds ($20''$). To convert seconds to minutes, we divide by 60 ($20/60 = 1/3$). This equals approximately 0.33 minutes.

Step 4: Conclusion Therefore, 0.33 minutes is the equivalent least count.
Final Answer: (A)