What is Esperanto?

Which of the following statements is true?

According to the Census 2011, in India, what is the percentage of people (approximately) considered to be migrants (internal), i.e., now settled in a place different from their previous residence?

The world Population Day is observed on

Which one of the following is the largest linguistic group of India?

Which one among the following is the most populated State in India as per Census 2011?