Q71. Which is the broadest strait in the world?
a) Strait of Malacca
b) Strait of Gibraltar
c) Davis Strait
d) Bering Strait
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Correct Answer: c) Davis Strait
Explanation: The Davis Strait, located between Greenland and Baffin Island in Canada, is the broadest strait in the world. It is a northern arm of the Atlantic Ocean and connects the Labrador Sea to Baffin Bay. The strait is named after English explorer John Davis, who explored the area in search of a Northwest Passage.
Q72. Which is the narrowest strait in the world?
a) Strait of Malacca
b) Bosphorus Strait
c) Chalkis Strait
d) Strait of Gibraltar
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Correct Answer: c) Chalkis Strait
Explanation: The Chalkis Strait, also known as the Euripus Strait, is the narrowest strait in the world, with a width of only 45 yards at its narrowest point. It is located between the Greek mainland and the island of Euboea in the Aegean Sea.
Q73. Which is the largest gulf in the world?
a) Gulf of Mexico
b) Gulf of Guinea
c) Persian Gulf
d) Gulf of Alaska
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Correct Answer: a) Gulf of Mexico
Explanation: The Gulf of Mexico, bordered by the United States, Mexico, and the island nation of Cuba, is the world’s largest gulf. It has a shoreline of 2,100 miles and covers an area of approximately 615,000 square miles.
Q74. Which is the largest archipelago in the world?
a) Malay Archipelago, Indonesia
b) Canadian Arctic Archipelago
c) Japanese Archipelago
d) Philippine Archipelago
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Correct Answer: a) Malay Archipelago, Indonesia
Explanation: The Malay Archipelago, located in Indonesia, is the largest archipelago in the world, consisting of more than 17,000 islands. It is also known as the East Indies, Nusantara, and the Spices Archipelago.
Q75. Which is the tallest active geyser in the world?
a) Steamboat Geyser, Yellowstone National Park, U.S.A.
b) Old Faithful, Yellowstone National Park, U.S.A.
c) Strokkur, Iceland
d) Geysir, Iceland
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Correct Answer: a) Steamboat Geyser, Yellowstone National Park, U.S.A.
Explanation: Steamboat Geyser, located in Yellowstone National Park’s Norris Geyser Basin, is the world’s tallest active geyser. Its major eruptions shoot water more than 300 feet (91 meters) high. The geyser’s eruptions are unpredictable and can occur years apart.
Q76. Which is the largest river basin in the world?
a) Amazon River Basin
b) Nile River Basin
c) Mississippi River Basin
d) Congo River Basin
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Correct Answer: a) Amazon River Basin
Explanation: The Amazon River Basin, located in South America, is the largest river basin in the world, covering an area of approximately 7,200,000 square kilometers (2,720,000 square miles). The basin is home to the world’s largest tropical rainforest and an incredibly diverse range of plant and animal species.
Q77. Which is the rainiest spot in the world?
a) Mawsynram, Meghalaya, India
b) Cherrapunji, Meghalaya, India
c) Mount Waialeale, Hawaii, U.S.A.
d) Quibdó, Colombia
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Correct Answer: a) Mawsynram, Meghalaya, India
Explanation: Mawsynram, a village in the East Khasi Hills district of Meghalaya state in northeastern India, is the rainiest spot in the world, with an average annual rainfall of 11,872 millimeters (467.4 inches).
Q78. Which is the lightest gas in the world?
a) Hydrogen
b) Helium
c) Neon
d) Nitrogen
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Correct Answer: a) Hydrogen
Explanation: Hydrogen is the lightest gas in the world, with an atomic mass of 1.00784 u.
It is the most abundant element in the universe and is a key component of water, organic compounds, and many minerals.
Q79. Which is the lightest metal in the world?
a) Lithium
b) Aluminum
c) Magnesium
d) Beryllium
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Correct Answer: a) Lithium
Explanation: Lithium is the lightest metal in the world, with an atomic mass of 6.94 u. It is a soft, silvery-white alkali metal that is highly reactive and flammable. Lithium is used in a variety of applications, including batteries, lubricants, and pharmaceuticals.
Q80. Which element has the highest melting point?
a) Tungsten
b) Carbon
c) Rhenium
d) Osmium
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Correct Answer: a) Tungsten
Explanation: Tungsten has the highest melting point of all elements, at 3,422°C (6,191°F). It is a hard, dense metal with a wide range of applications, including electrical filaments, cutting tools, and aerospace components.