Current Affairs MCQs – Page 42 (Q411-420)

Albert Einstein, a German-born theoretical physicist, developed the theory of relativity, publishing his special theory in 1905 and his general theory in 1915, fundamentally reshaping our understanding of space, time and gravity. His famous equation, E equals mc squared, established the equivalence of mass and energy. Niels Bohr, Max Planck and Isaac Newton are tempting distractors, as each made other groundbreaking contributions to quantum mechanics and classical physics. Einstein won the 1921 Nobel Prize in Physics, notably for his explanation of the photoelectric effect rather than for relativity itself.

Isaac Newton, an English physicist and mathematician, is credited with formulating the law of universal gravitation, published in his 1687 work Philosophiae Naturalis Principia Mathematica, describing how every object attracts every other object with a force proportional to their masses. According to popular legend, Newton was inspired by watching an apple fall from a tree at his family home. Galileo Galilei, Albert Einstein and Johannes Kepler are tempting distractors, as each made other major contributions to astronomy and physics, with Kepler's laws of planetary motion predating and informing Newton's own work. Newton's laws of motion and gravitation dominated physics for over two centuries until Einstein's theory of relativity.

Isaac Newton formulated the three laws of motion in classical mechanics, published in his 1687 masterwork Philosophiae Naturalis Principia Mathematica, describing the relationship between a body and the forces acting upon it. His first law describes inertia, his second relates force to mass and acceleration, and his third describes action and reaction pairs. Galileo Galilei, Albert Einstein and James Clerk Maxwell are tempting distractors, as each made other foundational contributions to physics in different eras. Newton's laws remained the standard framework of classical mechanics for over two centuries, until refined by Einstein's theory of relativity for extreme speeds and scales.

Charles Darwin, an English naturalist, proposed the theory of evolution by natural selection, most famously outlined in his 1859 book On the Origin of Species, following extensive observations made during his voyage aboard HMS Beagle. His theory proposed that species evolve over time through the survival and reproduction of individuals best adapted to their environment. Carl Linnaeus, Louis Pasteur and Gregor Mendel are tempting distractors, with Linnaeus instead known for developing taxonomic classification and Mendel for founding the science of genetics. Darwin's ideas, though controversial in his time, remain the foundational framework of modern evolutionary biology.

Dmitri Mendeleev, a Russian chemist, developed the periodic table of chemical elements in its widely recognized form in 1869, organizing elements by increasing atomic weight and recurring chemical properties. Remarkably, he left gaps in his table for elements not yet discovered and successfully predicted their properties, which were later confirmed as new elements were found. Marie Curie, Antoine Lavoisier and John Dalton are tempting distractors, as each made other major contributions to chemistry, including radioactivity, the law of conservation of mass and atomic theory. Mendeleev's periodic table remains the fundamental organizing framework of modern chemistry today.

Wilhelm Roentgen, a German physicist, discovered X-rays in 1895 while experimenting with cathode ray tubes, noticing a mysterious form of radiation capable of passing through solid objects and creating images of the bones inside a human hand. His discovery revolutionized medical diagnostics almost immediately and earned him the first-ever Nobel Prize in Physics in 1901. Marie Curie, J.J. Thomson and Ernest Rutherford are tempting distractors, as each made other landmark contributions to radioactivity and atomic physics shortly afterward. The unit of X-ray and gamma-ray exposure, the roentgen, is named in his honor.

Edward Jenner, an English physician, developed the first successful smallpox vaccination in 1796, using material from cowpox lesions to confer immunity against the far more dangerous smallpox virus. His pioneering work laid the foundation for the entire field of immunology and the modern practice of vaccination. Alexander Fleming, Louis Pasteur and Robert Koch are tempting distractors, as each made later, equally important contributions to microbiology and medicine. The global eradication of smallpox, declared complete by the WHO in 1980, is considered one of the greatest achievements in public health history, building directly on Jenner's discovery.

Alessandro Volta, an Italian physicist, is credited with inventing the first practical electric battery, known as the voltaic pile, in 1800, providing the first reliable source of continuous electric current. His invention enabled a wave of new experiments in electricity and chemistry that had previously been impossible without a steady current source. Andre-Marie Ampere, Michael Faraday and Benjamin Franklin are tempting distractors, as each made other major contributions to the study of electricity and magnetism. The volt, the standard unit of electric potential, is named in Volta's honor.

Charles Babbage, an English mathematician and inventor, designed the Analytical Engine in the 1830s, a mechanical general-purpose computer considered a key conceptual forerunner of the modern digital computer, though it was never fully built during his lifetime. His collaborator, Ada Lovelace, wrote what is considered the first computer algorithm intended to be processed by the machine. Ada Lovelace, Alan Turing and John von Neumann are tempting distractors, with Lovelace often celebrated as the first computer programmer for her work on Babbage's design. Babbage is often referred to as the father of the computer for his pioneering conceptual work.

Tim Berners-Lee, a British computer scientist, is credited with inventing the World Wide Web in 1989 while working at CERN, the European particle physics laboratory, creating the system of hyperlinked documents that underpins the modern internet browsing experience. He also wrote the first web browser and web server, laying the technical foundation for the web's explosive growth in the 1990s. Steve Jobs, Vint Cerf and Bill Gates are tempting distractors, with Cerf instead known as a key architect of the underlying Internet protocols that predate the web itself. Berners-Lee later founded the World Wide Web Consortium to help guide the web's ongoing technical standards.