All Free General Knowledge MCQs with Answers

• A. The Amazon
• B. The Paraná
• C. The Orinoco
• D. The São Francisco

Explanation: The Amazon, about 6,400 km, is South America's longest river.

• A. The Indian Ocean
• B. The Atlantic Ocean
• C. The Southern Ocean
• D. The Pacific Ocean

Explanation: The Amazon discharges into the Atlantic off Brazil's north-east coast.

• A. The Rockies
• B. The Guiana Highlands
• C. The Andes
• D. The Brazilian Highlands

Explanation: The Amazon's farthest headstreams rise in the Peruvian Andes.

• A. Peru
• B. Colombia
• C. Brazil
• D. Venezuela

Explanation: The Amazon's huge mouth and delta lie in northern Brazil.

• A. The Madeira and the Tapajós
• B. The Xingu and the Tocantins
• C. The Purus and the Juruá
• D. The Rio Negro and the Solimões

Explanation: The dark Rio Negro and muddy Solimões flow side by side near Manaus before merging.

• A. The Paraná and Uruguay rivers
• B. The Paraná and Iguazu rivers
• C. The Paraguay and Paraná rivers
• D. The Uruguay and Negro rivers

Explanation: The Paraná and Uruguay rivers join to form the wide Río de la Plata estuary.

• A. The Magdalena
• B. The Orinoco
• C. The Essequibo
• D. The Amazon

Explanation: The Orinoco arcs through Venezuela and empties into the Atlantic.

• A. Lake of the Woods
• B. Reelfoot Lake
• C. Lake Itasca in Minnesota
• D. Lake Superior

Explanation: The Mississippi rises at Lake Itasca in northern Minnesota.

• A. Hudson Bay
• B. The Gulf of Maine
• C. The Gulf of California
• D. The Gulf of Mexico

Explanation: The Mississippi ends in a bird's-foot delta on the Gulf of Mexico.

• A. The Ohio River
• B. The Missouri River
• C. The Arkansas River
• D. The Red River

Explanation: The Missouri, the longest US river, joins the Mississippi just north of St. Louis.

• A. The Snake River
• B. The Green River
• C. The Colorado River
• D. The Rio Grande

Explanation: The Colorado River cut the Grand Canyon through Arizona's plateau.

• A. The Brazos River
• B. The Colorado River
• C. The Pecos River
• D. The Rio Grande

Explanation: The Rio Grande forms much of the Texas–Mexico border.

• A. The St. Lawrence River
• B. The Hudson River
• C. The Ottawa River
• D. The Richelieu River

Explanation: The St. Lawrence carries Great Lakes water north-east to the Atlantic.

• A. The St. Clair River
• B. The Niagara River
• C. The Genesee River
• D. The Detroit River

Explanation: The Niagara River drops over Niagara Falls between Lake Erie and Lake Ontario.

• A. The Swan and Avon rivers
• B. The Brisbane and Fitzroy rivers
• C. The Murray and Darling rivers
• D. The Murrumbidgee and Lachlan rivers

Explanation: The Murray–Darling Basin is named for its two principal rivers.

• A. Barringer Crater, USA
• B. The Sudbury Basin, Canada
• C. The Chicxulub crater, Mexico
• D. The Vredefort impact structure, South Africa

Explanation: The Vredefort Dome, about 2 billion years old, is the largest verified impact structure on Earth.

• A. Lake Vänern
• B. Lake Ladoga, Russia
• C. Lake Geneva
• D. Lake Onega

Explanation: Lake Ladoga in north-west Russia (about 17,700 sq km) is Europe's largest lake.

• A. 4.5 billion years
• B. 66 million years
• C. 2 billion years
• D. 250 million years

Explanation: Vredefort formed around 2 billion years ago, among the oldest known impact structures.

• A. the formation of the Himalayas
• B. the last Ice Age
• C. the splitting of Pangaea
• D. the extinction of the dinosaurs

Explanation: The Chicxulub impact about 66 million years ago is linked to the dinosaur extinction.

• A. the largest volcanic crater in the USA
• B. an ancient copper mine
• C. the deepest canyon in the USA
• D. a well-preserved meteorite impact crater

Explanation: Arizona's Barringer Crater is one of the best-preserved impact sites on Earth.