Who administers the oath of office to the President of India?

Explanation

1. 01

   Article 60 prescribes the form of the President's oath and says who administers it.

2. 02

   It is the Chief Justice of India, and in the Chief Justice's absence the senior-most judge of the Supreme Court available.

3. 03

   This is the judiciary swearing in the head of the executive, which is why none of the other three offices appears in the Article.