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 first woman Chief Secretary of West Bengal? 

Which of the following has launched a global initiative to become the world’s first multinational IIT?

In which of the following states is India’s first bio happy district, called Kiyi Panyor, being created?