India signed a contract with the International Seabed Authority for exploration of polymetallic nodules in the Central Indian Ocean Basin in:

Oceans & Hydrosphere — Preparation

This question tests your understanding of Oceans & Hydrosphere, a key topic in the General Knowledge section. The detailed solution above uses a step-by-step approach to show the reasoning, and where available, a shortcut that helps you solve similar questions in under 90 seconds during the actual exam.

This topic covers the hydrosphere: the oceans and seas of the world, ocean relief features such as trenches and ridges, ocean currents, tides, waves, salinity, and the world's major lakes, straits, gulfs and islands. Questions commonly ask about the largest and deepest ocean (the Pacific, with the Mariana Trench), warm and cold ocean currents, the causes of tides, and which water bodies a strait connects. For example, the Palk Strait separates India and Sri Lanka, and the Strait of Gibraltar connects the Atlantic Ocean and the Mediterranean Sea. Practise the oceans and hydrosphere questions below, written in the style of the general awareness sections of exams such as SSC, banking, railways, CUET GAT, MAH CET and CLAT. Each question comes with a detailed explanation that adds related facts, so every question helps you revise more than one point.