Current Affairs MCQs – Page 25 (Q241-250)

The Murray River is the longest river in Australia, stretching approximately 2,508 kilometers through southeastern Australia and forming much of the border between the states of New South Wales and Victoria before reaching the Southern Ocean. Together with its major tributary, the Darling River, it forms the Murray-Darling Basin, a critical agricultural region often described as Australia's food bowl. The Darling River itself is a tempting distractor since it is the Murray's principal tributary and is sometimes confused with the main river system. The Murray-Darling Basin has faced significant environmental strain in recent decades due to prolonged drought and heavy agricultural water use.

The Amazon River is the longest river in South America, stretching roughly 6,400 to 7,000 kilometers depending on the measurement method used, flowing primarily through Brazil before emptying into the Atlantic Ocean. It carries by far the largest volume of water of any river on Earth and its basin supports the Amazon Rainforest, the largest tropical rainforest in the world. The Orinoco River is a tempting distractor since it is also a major South American river, flowing mainly through Venezuela and Colombia, but it is considerably shorter than the Amazon. Some scientific measurements taken in recent decades suggest the Amazon may actually surpass the Nile as the world's longest river.

Lake Victoria, bordered by Uganda, Kenya and Tanzania, is the largest lake in Africa by surface area, covering approximately 68,800 square kilometers, and is also the primary source of the White Nile, one of the Nile River's two major tributaries. It was named by British explorer John Hanning Speke in 1858 after Queen Victoria, during his search for the source of the Nile. Lake Tanganyika is a tempting distractor since it is Africa's deepest lake and holds a larger volume of water, but Lake Victoria has a greater surface area. Lake Victoria supports a massive fishing industry that provides livelihoods for millions of people across the three bordering countries.

Mauna Kea, a dormant volcano on the island of Hawaii, is notable as the tallest mountain in the world when measured from its base on the ocean floor to its summit, a total height of roughly 10,200 meters, taller than Mount Everest measured this way. However, since most of Mauna Kea lies submerged underwater, its height above sea level is only about 4,207 meters, far shorter than Everest's officially recognized elevation. Sea level is a tempting distractor since that is the standard measurement used for Everest's world-famous height ranking. Mauna Kea's summit also hosts numerous major astronomical observatories due to its high altitude, dry air and minimal light pollution.

Australia is the largest country by area located entirely on the continent of Australia, covering approximately 7.7 million square kilometers and being the only country that occupies an entire continent by itself. It is also classified as the sixth-largest country in the world overall, despite having a relatively small population concentrated mainly along its coastlines. Papua New Guinea is a tempting distractor since it is geographically close and sometimes grouped with Oceania, but it is considered part of a separate region, not the Australian continent itself. Australia's interior, known as the Outback, remains sparsely populated and includes vast stretches of desert and rugged terrain.

Canada has the longest coastline in the world, stretching approximately 202,080 kilometers due to its extensive Arctic archipelago, numerous bays, and countless islands along its Pacific, Atlantic and Arctic coasts. Its coastline is nearly four times longer than that of the next-ranked country, reflecting the country's uniquely fragmented and island-heavy northern geography. Indonesia is a tempting distractor since it is made up of thousands of islands and also has a notably long coastline, but it ranks well behind Canada. Canada's Arctic coastline has become increasingly significant amid climate change, as melting sea ice opens new shipping routes through the Northwest Passage.

Kazakhstan is the largest landlocked country in the world by area, covering approximately 2.7 million square kilometers in Central Asia, and is also the ninth-largest country overall despite having no direct access to the open ocean. It borders the Caspian Sea, which, despite its name, is technically a landlocked lake rather than a true sea connected to global oceans. Mongolia is a tempting distractor since it is also a large landlocked Central Asian country, but it is considerably smaller in area than Kazakhstan. Kazakhstan gained independence from the Soviet Union in 1991 and possesses significant oil, natural gas and mineral resources.

Algeria is the largest country in Africa by area, covering approximately 2.38 million square kilometers, a ranking it achieved after the 2011 split of Sudan into Sudan and South Sudan reduced Sudan's total territory. Much of Algeria's land consists of Sahara Desert, with the vast majority of its population concentrated along the northern Mediterranean coastline. The Democratic Republic of Congo is a tempting distractor since it is also enormous and one of Africa's largest countries, but it ranks second to Algeria in total area. Algeria gained independence from France in 1962 after a prolonged and bloody war of independence.

Brazil is the largest country in South America by both area and population, covering approximately 8.5 million square kilometers and encompassing roughly 60 percent of the Amazon Rainforest within its borders. It is the only Portuguese-speaking country in the Americas, a legacy of Portuguese colonization beginning in the 16th century, distinguishing it linguistically from its Spanish-speaking neighbors across the continent. Argentina, the second-largest South American country, is a tempting distractor since it is also vast, but considerably smaller than Brazil in total area. Brazil's population of over 200 million makes it the most populous country in South America and the seventh-most populous in the world.

Mount Kilimanjaro, located in Tanzania, is the highest mountain in Africa, standing at approximately 5,895 meters above sea level, and is also the tallest freestanding mountain in the world, not part of any connected mountain range. It is a dormant volcano with three distinct volcanic cones and is famous for its snow-capped summit despite lying near the equator, though its glaciers have been rapidly shrinking due to climate change. Mount Kenya, Africa's second-highest peak, is a tempting distractor since it is also a prominent East African mountain, but it stands notably lower than Kilimanjaro. Kilimanjaro is a popular destination for trekkers since, unlike many tall peaks, it can be climbed without technical mountaineering equipment.