Multiple choice

A black liquid is important for a country’s economy. It is also known as black gold. Identify the liquid.

  1. Natural gas

  2. Iron

  3. Copper

  4. Petroleum

Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Petroleum is used in the manufacture of detergents, fibres (polyester, nylon, acrylic, etc.), polythene and other man-made plastics. Due to its great commercial importance, petroleum is also called ‘black gold’.