Q. Which among the following was called as the Central Pillar of the administrative system of Delhi sultanate?
Answer: Iqta System
Notes: In Iqta System, the land of the empire was divided into several large and small tracts called Iqta and assigned these Iqtas to his soldiers, officers and nobles. In the beginning, an Iqta was based upon salary. Later, under Firoz Shah Tughlaq it became hereditary.