Physics Inventions — Set 4
Inventions · भौतिकी के आविष्कार · Questions 31–40 of 70
The first mechanical calculator, known as the 'Pascaline', was invented by?
Correct Answer: B. Blaise Pascal
• **Blaise Pascal** = He invented the 'Pascaline', the first mechanical calculator. • **1642** — The year Pascal invented the device to assist his father with tax calculations. • 💡 Wrong-option analysis: John Napier: known for logarithms and 'Napier's Bones', not the Pascaline; Charles Babbage: designed the Difference Engine and Analytical Engine much later; Gottfried Leibniz: improved Pascal's design and invented the stepped reckoner.
Who is the inventor of the first practical electric fan, introduced in the 1880s?
Correct Answer: D. Schuyler Wheeler
• **Schuyler Wheeler** = He invented the first practical two-blade personal electric fan. • **1882** — The year Wheeler introduced his pioneering electric fan. • 💡 Wrong-option analysis: George Westinghouse: known for AC power systems and air brakes; Philip Diehl: improved the ceiling fan and developed electric motors; Nikola Tesla: known for AC electricity and various electrical inventions, but not the specific practical electric fan.
The first synthetic fiber, Nylon, was invented by a team led by?
Correct Answer: D. Wallace Carothers
• **Wallace Carothers** = He led the team at DuPont that developed Nylon, the first completely synthetic fiber. • **1935** — The year Nylon was developed, marking a significant breakthrough in material science. • 💡 Wrong-option analysis: Dmitri Mendeleev: developed the periodic table of elements; John Dalton: proposed the atomic theory; Linus Pauling: Nobel laureate known for work on chemical bonds and molecular structure.
Who invented the first modern internal combustion engine using the 'Otto Cycle'?
Correct Answer: B. Nikolaus Otto
• **Nikolaus Otto** = He invented the first modern internal combustion engine using the 'Otto Cycle'. • **1876** — The year Otto developed the four-stroke engine, which became the basis for most gasoline engines. • 💡 Wrong-option analysis: Karl Benz: often credited with the first automobile powered by an internal combustion engine; Robert Bosch: known for automotive components like spark plugs and ignition systems; Rudolf Diesel: invented the diesel engine.
The first practical submarine, the 'Turtle', was invented by whom in 1775?
Correct Answer: B. David Bushnell
• **David Bushnell** = He invented the 'Turtle', the first practical submarine used in combat operations. • **1775** — The year Bushnell built the 'Turtle' during the American Revolutionary War. • 💡 Wrong-option analysis: Cornelis Drebbel: built an early human-powered submarine in the 17th century but less practical for combat; Robert Fulton: designed the 'Nautilus' submarine and developed steamboats; John Holland: designed the first submarine acquired by the US Navy in the late 19th century.
Which scientist invented the first stethoscope using a wooden tube?
Correct Answer: A. René Laennec
• **René Laennec** = He invented the first stethoscope using a rolled paper tube, which later became a wooden tube. • **1816** — The year Laennec invented the stethoscope to listen to internal body sounds. • 💡 Wrong-option analysis: Edward Jenner: developed the smallpox vaccine; Joseph Lister: pioneer of antiseptic surgery; Louis Pasteur: known for pasteurization and germ theory.
The ballpoint pen was invented and popularized by?
Correct Answer: D. László Bíró
• **László Bíró** = He, a Hungarian journalist, invented and patented the first successful ballpoint pen. • **1938** — The year Bíró patented his improved ballpoint pen design. • 💡 Wrong-option analysis: William Hoover: founder of the Hoover Company, known for vacuum cleaners; Lewis Waterman: invented the modern fountain pen; John Loud: patented an early version of the ballpoint pen in 1888, but it wasn't commercially successful.
Who invented the first successful electric telegraph system in the United States?
Correct Answer: B. Samuel Morse
• **Samuel Morse** = He co-developed the electric telegraph system and the Morse code. • **1830s** — The decade when Morse made significant advancements in telegraphy, leading to its widespread adoption. • 💡 Wrong-option analysis: Cyrus Field: organized the laying of the first transatlantic telegraph cable; Alexander Graham Bell: invented the telephone; Eli Whitney: invented the cotton gin.
The safety pin was invented and patented by which American inventor in 1849?
Correct Answer: B. Walter Hunt
• **Walter Hunt** = He invented and patented the safety pin to settle a small debt. • **1849** — The year Hunt invented and patented the safety pin. • 💡 Wrong-option analysis: Isaac Singer: made significant improvements to the sewing machine design; Elias Howe: held an early patent for a lockstitch sewing machine; Whitcomb Judson: invented the zipper.
Who is the inventor of the first practical refrigerator using vapor-compression?
Correct Answer: A. Jacob Perkins
• **Jacob Perkins** = He was the first to patent a practical vapor-compression refrigeration cycle. • **First to patent** — Perkins's pioneering work in vapor-compression laid the foundation for modern refrigeration. • 💡 Wrong-option analysis: William Cullen: demonstrated artificial refrigeration in 1755 using evaporation but without compression; John Gorrie: invented an ice-making machine and refrigerator in 1844, focused on medical use; James Harrison: built the first commercial ice-making machine in Australia, commercialized the technology.