General Science MCQs – Page 90 (Q891-900)

Nikola Tesla, a Serbian-American inventor, engaged in a well-documented and historically significant rivalry with Thomas Edison over competing electrical power systems during the late 1880s and early 1890s, a period of intense industry competition that became widely known as the War of the Currents, pitting Tesla's more efficient alternating current, or AC, system against Edison's earlier direct current, or DC, system. Tesla's superior AC system ultimately prevailed as the dominant global standard for large-scale electricity generation and long-distance power transmission, largely due to its significantly greater overall practical efficiency, and this landmark historical technological rivalry remains a frequently cited and studied episode in the broader history of electrical engineering.

Samuel Morse, an American inventor and painter, developed his early telegraph system and the accompanying Morse code signaling system during the 1830s and 1840s, innovations that fundamentally helped revolutionize long-distance human communication throughout the nineteenth century by allowing rapid transmission of written messages over dedicated telegraph wires using patterns of short and long electrical signals. Morse's genuinely groundbreaking invention dramatically transformed how information could travel across vast distances well before the later invention of the telephone, and telegraph networks based on his innovative work eventually spanned entire continents and even crossed beneath the ocean via specially designed undersea cables.

Dmitri Mendeleev's periodic table arrangement, first published in 1869, famously left several deliberate gaps for elements not yet actually discovered at that particular time, and his table successfully predicted the specific properties of these still-undiscovered elements, including gallium and germanium, with a genuinely remarkable degree of predictive accuracy that was later fully confirmed once those particular elements were actually subsequently discovered. This striking predictive success provided compelling, powerful validation for Mendeleev's underlying periodic arrangement approach, definitively establishing his organizational system as the essential foundational basis for the modern periodic table still used universally throughout chemistry today.

Frederick Banting, a Canadian physiologist, along with his assistant Charles Best, achieved the successful isolation of insulin in the early 1920s, a landmark medical breakthrough that fundamentally transformed the treatment of diabetes from what had previously been an almost universally fatal diagnosis into a genuinely manageable chronic condition. Before this transformative discovery, diabetic patients, particularly those with type 1 diabetes, typically faced an inevitably fatal outcome within a relatively short period following diagnosis, and Banting's genuinely groundbreaking, life-saving work earned him the Nobel Prize in Physiology or Medicine in 1923, at the time making him the youngest ever Nobel laureate in that particular scientific category.

James Prescott Joule, an English physicist, is widely credited as a co-founder of the field of thermodynamics through his significant nineteenth-century experimental work establishing the precise mechanical equivalent of heat, definitively demonstrating that mechanical energy could be reliably and precisely converted into a specific, measurable equivalent quantity of heat energy. Joule's important, foundational experimental work helped establish the fundamental principle of energy conservation, later more formally generalized as the first law of thermodynamics, and the SI unit of energy, the joule, was fittingly named in his honor to properly recognize this genuinely significant scientific contribution.

Gregor Mendel's nineteenth-century foundational work on inheritance patterns in pea plants went largely unnoticed and underappreciated by the broader contemporary scientific community until it was rediscovered and properly recognized as genuinely important around the year 1900, several decades after his original death, when multiple other researchers working independently happened to arrive at strikingly similar experimental conclusions and subsequently discovered Mendel's own earlier, largely overlooked published work. This eventual, delayed rediscovery firmly established Mendel's foundational principles as the essential starting point for the entire subsequent modern field of genetics, which developed rapidly throughout the early decades of the twentieth century.

Mary Anning, a British fossil collector and self-taught paleontologist working during the early nineteenth century, made numerous genuinely significant fossil discoveries along the southern English coastline, including several remarkably well-preserved marine reptile specimens, contributing crucial early physical evidence that ultimately helped support the subsequent development of the broader scientific theory of evolution. Despite her substantial, genuinely important scientific contributions, Anning received comparatively little formal recognition during her own lifetime, largely due to significant prevailing social and gender barriers restricting women's meaningful participation within the formal scientific community of that particular historical era.

Albert Einstein's research specifically on the photoelectric effect, rather than his arguably more famous theory of relativity, earned him the Nobel Prize in Physics in 1921, since his 1905 explanation of the photoelectric effect, in which light striking certain metal surfaces can eject electrons, provided crucial early supporting evidence for the emerging quantum theory of light as consisting of discrete energy packets called photons. Although Einstein's relativity work is arguably far more famous and widely recognized today among the general public, the photoelectric effect research was considered at the time to be more experimentally verifiable and immediately practically significant by the Nobel committee making the formal award decision.

Alexander Fleming's foundational 1928 discovery of a mold's antibacterial effect, when he noticed that Penicillium mold had accidentally contaminated one of his bacterial culture plates and appeared to be actively killing the surrounding bacteria, eventually led directly to the subsequent mass production of penicillin as the world's first widely used antibiotic medication. Although Fleming himself made the crucial original discovery, it was actually Howard Florey and Ernst Chain who later successfully developed practical, effective methods to purify and mass-produce penicillin on an industrial scale, and all three scientists together shared the Nobel Prize in Physiology or Medicine in 1945 for their combined, related contributions.

Konrad Lorenz, an Austrian biologist, conducted extensive pioneering research using various animals, including greylag geese, that helped found the modern scientific field of ethology, the systematic scientific study of animal behavior. Lorenz is particularly well known for his groundbreaking research on imprinting, demonstrating that certain young animals will instinctively and reliably form a strong, lasting attachment bond to the very first moving object they happen to encounter shortly after hatching or birth, often famously his own personal self in his own well-documented experiments. Lorenz shared the Nobel Prize in Physiology or Medicine in 1973 for his substantial and influential overall contributions to this developing field.