Question

what is the duty of a district collector and deputy commissioner

Answer 1

 Deputy Commissioner is the chief administrative and revenue officer of a district. The office of the deputy commissioner traces its origin to the district collector system of the early phase of British rule.The District Magistrate is the head of the Criminal Administration of the District and the Police force is the instrument provided by Government to enable him to enforce his authority and fulfill his responsibility for the maintenance of Law & Order.

Answer 2

When an IAS officer performs the following duties :-

Land assessment,
Land acquisition,
Collection of land revenue,
Collection of various taxesDistribution of agriculture loans.

At this very moment, he is termed as District Collector.

The office of the deputy commissioner traces its origin to the district collector system of the early phase of British rule.