61. The Iron Pillar at Mehrauli in Delhi is believed to record the achievements of
c) Chandragupta 2
Ans 61 C
Explanation: The Iron Pillar located in Delhi, India, is a 7 m (23 ft) column in the Qutb complex, notable for the rust-resistant composition of the metals used in its construction.
The pillar has attracted the attention of archaeologists and materials scientists because of its high resistance to corrosion, and has been called a "testimony to the high level of skill achieved by the ancient Indian iron smiths in the extraction and processing of iron.
The oldest inscription on the pillar is that of a king named Chandra, generally identified as the Gupta emperor Chandragupta II.