How do you switch between user accounts in a Unix/Linux

Where is the 'Ninety East Ridge' located?

Which one of the following longitudes determines the Indian standard time?

Which of the following is the largest desert in the world?

Consider the following statements:

1. Great Nicobar is the northernmost island of the Nicobar Islands Archipelago.

The McMahon Line serves as a de facto boundary between which two countries?

The Deccan trap was formed by the: 

What type of erosion results in the formation of 'Mushroom rock' in desert regions?

Consider the following statements regarding International borders:

1. Mizoram and Nagaland share a border with Myanmar only.

The Panama Canal connects which two oceans?

What is the primary source of energy in an ecosystem?