Iron pillar near the Qutub Minar in Delhi is famous for the following facts. Which of these facts is responsible for its long stability?

Train left Delhi at 11:00 a.m. Reaches Ambala at 2:20 p.m. Subtract 2:20pm-11:00am=3:20 hours

Train left Delhi at 11:00 a.m. Reaches Ambala at 2:20 p.m. The Journy time is 2:20pm - 11:00am = 3:20 hours

(d) The field consists of concentric circles centred on the wire. On applying right-hand thumb rule, we find the direction of magnetic field. The field is in the form of concentric...

Here, r = 50 /2 cm = 25 cm = 0.25 m, h = 3.5 m  Curved surface area of the pillar = 2πrh  = 2 × 22/ 7 × 0.25 ×...

Delhi has been categorized as the fourth most polluted city of the world in a list of 41 cities. Burning of fossil fuels has added to the pollution of air...

Hydrogen bonding.

Ths is because the stirring effect due to Brownian movement does not allow the particles to settle down.

The magnetic field lines near a long straight wire carrying current are concentric circles centred on the wire. So choice (iv) is correct.

Dilli Sarkar (Government of Delhi) is written under Delhi Jal Board because Delhi Jal Board is a subsidiary of Government of Delhi. 

(d) It was written by Samudragupta's court poet Harisena.