Famous Personalities and Discoveries

Nicolaus Copernicus formulated the heliocentric model in the 16th century, showing that Earth revolves around the Sun. This replaced the geocentric (Earth-centered) model that had dominated for centuries.

Charles Richter developed the Richter magnitude scale in 1935 at CalTech to measure earthquake magnitude. The scale is logarithmic, meaning each whole number increase represents approximately 31.6 times more energy release and 10 times more ground motion.

Ramanathan V. Guha, an Indian computer scientist, co-developed the Meta Content Framework (MCF) while working at Apple's Advanced Technology Group. MCF was an important precursor to RSS and modern web syndication formats. The other options (Vinod Khosla, Sabeer Bhatia) are prominent Indian tech entrepreneurs but not associated with MCF.

Halley's Comet is named after Edmond Halley, the English astronomer who calculated its orbit and predicted its return in 1758. He was the first to recognize that the comet seen in 1531, 1607, and 1682 was the same object returning periodically. Halley did not discover the comet but correctly predicted its 76-year orbital period.

Georges Lemaître, a Belgian Catholic priest and physicist, first proposed what became known as the Big Bang Theory in 1927. He called it the 'hypothesis of the primeval atom,' describing the universe's expansion from an initial dense state.

Uranus was discovered by William Herschel in 1781. Option C (Herschel) is the correct answer.

Euclid is known as the 'Father of Geometry' for his work 'Elements', which systematically presented the principles of geometry and established the axiomatic method. While Pythagoras contributed the famous theorem, Euclid's comprehensive geometric framework earned him this title.

Swami Vivekananda was born on January 12, 1863 (12 Jan). This date is now celebrated as National Youth Day in India in his honor. He was a key figure in introducing Indian philosophies to the Western world and represented Hinduism at the 1893 Parliament of World Religions in Chicago.

Galileo Galilei made multiple groundbreaking contributions: he improved the telescope (not invented it), discovered four of Jupiter's moons, and studied pendulum motion for timekeeping. While he did not invent the telescope, his astronomical discoveries and pendulum studies were revolutionary.

Barack Obama was born on August 4, 1961, in Honolulu, Hawaii. This is a well-documented biographical fact, making option A the correct choice.

Charles Richter developed the Richter scale in 1935 at Caltech to measure earthquake magnitude. This logarithmic scale quantifies the energy released by seismic events, with each whole number increase representing ten times more amplitude.

Leonardo da Vinci designed early hang glider concepts in the late 15th century, though they were not built in his lifetime. The Wright brothers invented powered aircraft, Francis Rogallo developed the modern hang glider in 1948, and Galileo was an astronomer.

Aristotle was indeed Alexander's teacher. Philip II of Macedon hired Aristotle to tutor his young son Alexander at the Temple of the Nymphs at Mieza. This education had a profound influence on Alexander's intellectual development and interest in philosophy, science, and literature.

Alexander's father was Philip II of Macedon (also known as Philip II). Philip was a skilled military leader and politician who transformed Macedon into a powerful kingdom. He was assassinated in 336 BC, after which Alexander succeeded him to the throne at the age of 20.