P.T. Usha is nicknamed: MCQ with Answer and Explanation

Explanation:
C. V. Raman received the Nobel Prize in Physics in 1930 for the discovery of the Raman Effect. The others are also Nobel laureates but in different fields: Khorana (Medicine), Ramakrishnan (Chemistry), Chandrasekhar (Physics, but he was an Indian-American, and his work was later).

Explanation:
C. Rajagopalachari, Sarvepalli Radhakrishnan, and C.V. Raman were the first recipients of the Bharat Ratna in 1954.

Explanation:
Venkatraman Ramakrishnan won the Nobel Prize in Chemistry in 2009 for studies of the structure and function of the ribosome. He was born in Chidambaram, India.