Which one of the following statements is incorrect?

A solid pillar of rust-resistant steel forged many centuries ago and standing next to the Qutab Minar in Delhi is a testimony of the steel manufacturing skills of Indian artisans. Name the century in which it was constructed?

In which state is the tourist destination Ghoom Monastry located?

The plant disease Green ear affects which of the crops?

In which National park the one horned rhinoceros are commonly found:

The supreme authority for telecommunication in India is: