Explanation

• Country: China
• First use: 806 AD (approx.)
• Early name: Feiqian (Flying Money)
• Dynasty: Tang Dynasty → Song Dynasty (official issue)
• Importance: First-ever paper-based monetary system

Last verified on 11-06-2026

Explanation

• Alaska is the largest state of the USA by area.
• It was purchased from Russia in 1867.

Additional information:

• The United States of America is located in the North American continent.
• It consists of 50 states.
• California is the largest state of the USA by population.
• Texas is the 2nd largest state by area.

Last verified on 27-04-2026

Explanation

• Mohenjo-Daro is located in the Larkana district of Sindh.
• Mohenjo Daro means Mound of the Dead.
• It was discovered in 1922 by R. D. Banerji.
• It is a 4000-year-old city of the Indus Civilization.
• It was built around 2500 BC.

Last verified on 11-06-2026

Explanation

• The Mariana Trench is the deepest part of the Earth.
• It is located in the western Pacific Ocean.
• Its deepest point is called Challenger Deep.

Additional information:

• Depth: 10,994 meters
• Length: ~2,550 km
• Width: ~69 km

Last verified on 31-03-2026

Explanation

• Amazon river in South America is the largest river in the world.
• Nile river in Africa is the longest river in the world.

Additional information:

Last verified on 10-06-2026