Question 6
Iron pillar near the Qutub Minar in Delhi is famous for the following facts. Which of these facts is responsible for its long stability?
(a) It is more than 7 m high
(b) It weighs about 6000 kg
(c) It was built more than 1600 yrs ago
(d) It has no rust after such long period
Composition of the iron pillar make it resistant of rusting. It has not rusted after such a long period.