With reference to the demographic profile of India, which of the following statements is/are correct?

1. According to 2011 census, 82% of Indians are literate.
2. Sex ratio of the population has increased during the period 2001-2011.
3. The gender gap in literacy has not declined during the period 2001-2011.

Which of the statements given above is/are correct?

Consider the following statements :

1. Tropical rain forests are the only source of "lac".
2. India is the largest producer of "lac" in the world.
3. "Lac" is used in the manufacture of printing-ink, pharmaceuticals and dyes.

Which of the statements given above is/are correct?

Which of the following rivers originates near Mahabaleshwar?

 Which one of the following is the most likely food through which mercury enters our bodies and accumulates as a toxin?

The Strait of Malacca passes between :

The fuel of most widely used cryogenic engines consists of :