Question

The decadal exercise of Census Operation is done over a period of time, but the population count is assumed to be one existing on

• A. January 1st
• B. March 1st
• C. April 1st
• D. March 31st

Hint:

The census fixes one reference date so the whole country's count means the same moment in time.

Answer 1

The Correct Option is B

Step 1: Understanding the Concept:
Field staff take days or weeks to go house to house for the census, but the final report needs to describe the population as it stood at one instant, not as a moving number that changed every day of the survey.

Step 2: Key Formula or Approach:
This fixed instant is called the reference date. Anyone born after it is not counted, and anyone who died before it is still counted, because the whole record is frozen at that single point.

Step 3: Detailed Explanation:
For the Indian census, that frozen moment is sunrise on 1st March of the census year across most of the country (some flood or snow affected states like Assam and Jammu and Kashmir use an earlier reference date instead, so their numbers can be adjusted forward, but the standard answer taught for this question is March 1st).
January 1st is just the calendar new year, not a census term. April 1st and March 31st mark the start and close of India's financial year, which has nothing to do with counting people.

Step 4: Final Answer:
The whole decadal count, however long it takes to gather, is officially dated to 1st March of the census year.
\[ \boxed{\text{March 1st}} \]