latests
Which vitamin is synthesized in human skin under sunlight?
A) Vitamin A
B) Vitamin C
C) Vitamin D
D) Vitamin K
Ultraviolet B radiation converts skin precursors into vitamin D, essential for calcium metabolism and bone health.
latests
A)
Ferdinand Magellan
B)
Francis Drake
C)
Vasco da Gama
D)
James Cook
Ferdinand Magellan led the first expedition to circumnavigate the globe (1519–1522); although he died en route, the voyage completed the circuit.
latests
A)
Jordan
B)
Syria
C)
Israel
D)
Egypt
The Dead Sea Scrolls were found in caves near Qumran, Israel, in the 1940s, containing ancient Jewish manuscripts.
latests
A)
Avogadro
B)
Mendeleev
C)
Dalton
D)
Rutherford
Dmitri Mendeleev created the Periodic Table in 1869, arranging elements by properties and predicting undiscovered ones accurately.
latests
A)
Indonesia
B)
Australia
C)
Philippines
D)
Thailand
The Great Barrier Reef, the world’s largest coral reef system, lies off Australia’s coast, stretching over 2,300 kilometers.
latests
A)
Churchill
B)
Stalin
C)
Roosevelt
D)
Truman
Winston Churchill used the term “Iron Curtain” in 1946 to describe the division of Eastern and Western Europe.
latests
A)
Nucleus
B)
Ribosome
C)
Mitochondrion
D)
Golgi Apparatus
Mitochondria generate energy in the form of ATP through cellular respiration, hence called the cell’s powerhouse.
latests
A)
Red & Mediterranean
B)
Black & Caspian
C)
Adriatic & Ionian
D)
Arabian & Red
The Suez Canal links the Mediterranean Sea with the Red Sea, allowing direct shipping between Europe and Asia since 1869.
latests
A)
Adam Smith
B)
David Ricardo
C)
John Locke
D)
Karl Marx
Adam Smith’s *Wealth of Nations* laid the foundation of classical economics, advocating free markets and division of labor.
latests
A)
USA
B)
USSR
C)
UK
D)
Germany
Sputnik 1, launched by the USSR in 1957, was the first artificial satellite, marking the start of the space race.
latests
A)
Frank Lloyd Wright
B)
Frank Gehry
C)
Zaha Hadid
D)
Renzo Piano
Frank Gehry designed the Guggenheim Bilbao (opened 1997), noted for its curving titanium forms and revitalization of the city.
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