Inventions — Set 2
Physics · आविष्कार · Questions 11–20 of 60
The invention of the jet engine is primarily credited to which engineer?
Correct Answer: B. Frank Whittle
Frank Whittle and Hans von Ohain independently developed the first jet engine designs. Whittle's design utilized a centrifugal compressor to create thrust for aircraft propulsion. This invention revolutionized aviation by allowing planes to fly faster and higher.
Which device was invented by Alexander Graham Bell in 1876?
Correct Answer: B. The Telephone
Alexander Graham Bell patented the first practical telephone for transmitting human speech. His device used a variable resistance transmitter to convert sound into electrical signals. This invention transformed global communication and led to the creation of AT&T.
Who invented the first successful airplane?
Correct Answer: D. The Wright Brothers
Orville and Wilbur Wright achieved the first controlled, powered flight in 1903. They focused on aerodynamic control systems rather than just engine power alone. Their flight at Kitty Hawk lasted 12 seconds and covered 120 feet.
The invention of the hovercraft is attributed to?
Correct Answer: B. Christopher Cockerell
Christopher Cockerell used a system of air cushions to allow a vehicle to travel over water. His design reduced drag and friction by lifting the craft above the surface. The first commercial hovercraft entered service in the late 1950s.
Who invented the first mechanical computer, often called the Difference Engine?
Correct Answer: D. Charles Babbage
Charles Babbage designed the Difference Engine to calculate mathematical tables automatically. He is widely considered the 'Father of Computing' for his visionary mechanical designs. Although never fully completed in his lifetime, his concepts led to modern computers.
Which scientist invented the phonograph for recording and reproducing sound?
Correct Answer: A. Thomas Edison
Thomas Edison invented the phonograph in 1877 using a tinfoil-covered cylinder. It was the first device capable of both recording and playing back sound waves. This invention eventually evolved into the gramophone and the modern music industry.
The invention of the laser is based on the theoretical work of which physicist?
Correct Answer: D. Albert Einstein
Albert Einstein provided the theoretical foundation for stimulated emission in 1917. Theodore Maiman later built the first working laser using a synthetic ruby crystal. Lasers produce a highly focused and coherent beam of monochromatic light.
Who is the inventor of the first practical nuclear reactor (Chicago Pile-1)?
Correct Answer: D. Enrico Fermi
Enrico Fermi led the team that achieved the first self-sustaining nuclear chain reaction. The reactor was constructed under a football stadium at the University of Chicago. This breakthrough initiated the atomic age and the development of nuclear power.
The invention of the dynamite is credited to?
Correct Answer: A. Alfred Nobel
Alfred Nobel invented dynamite by stabilizing nitroglycerin with an absorbent substance called kieselguhr. It was much safer to handle and transport than liquid nitroglycerin. He later used his fortune to establish the Nobel Prizes in various fields.
Which scientist invented the seismograph to record earthquakes?
Correct Answer: D. John Milne
John Milne invented the first modern seismograph capable of recording distant earthquakes. His device used a weighted pendulum and a rotating drum to track ground motion. This invention allowed scientists to map the Earth's interior and seismic zones.