On which of the following days is World Hindi Day celebrated every year?

Scientists from which of the following countries have developed the first supercomputer-driven simulation to understand the Mpemba effect?

Who among the following has been appointed as the Goodwill Ambassador for the Pune Grand Tour 2026?

Which of the following Indians has been appointed as the chairperson of the United Nations Advisory Board on Disarmament Matters?

Madhav Gadgil passed away at the age of 82. Who was he?