Physics Inventions — Set 2
Inventions · भौतिकी के आविष्कार · Questions 11–20 of 70
The first practical mechanical television was demonstrated by whom in 1926?
Correct Answer: D. John Logie Baird
John Logie Baird achieved the first live transmission of moving grey-scale images. He used a rotating mechanical disk to scan images into electrical signals. He also demonstrated the first color television system in 1928.
Who invented the jet engine independently in both the UK and Germany during the 1930s?
Correct Answer: C. Frank Whittle and Hans von Ohain
Sir Frank Whittle and Hans von Ohain developed the turbojet engine separately. Whittle's design was first to be patented, while Ohain's was first to fly. This invention completely transformed the speed and scale of aviation.
The safety elevator, which prevents the car from falling if the cable breaks, was invented by?
Correct Answer: A. Elisha Otis
Elisha Otis demonstrated his safety brake at the 1854 World's Fair in New York. This invention made high-rise buildings and modern skyscrapers possible. It uses a spring-loaded latch to grab the guide rails.
Who is credited with the invention of the dynamite, leading to the establishment of the Nobel Prizes?
Correct Answer: A. Alfred Nobel
Alfred Nobel invented dynamite by mixing nitroglycerin with an absorbent substance. He sought a safer way to use explosives for mining and construction. He later used his fortune to fund the prestigious Nobel Prizes.
The first successful photograph was taken by which inventor in 1826?
Correct Answer: C. Nicéphore Niépce
Nicéphore Niépce produced the world's oldest surviving photograph using heliography. It required an exposure time of eight hours to capture a view from a window. He later collaborated with Louis Daguerre to refine the process.
Who invented the first electric motor, which used electromagnetic rotation?
Correct Answer: C. Michael Faraday
Michael Faraday built the first simple electric motor in 1821. He demonstrated how a wire carrying a current would rotate around a magnet. This discovery proved the link between electricity and magnetism.
The sewing machine was revolutionized with the invention of the lockstitch by?
Correct Answer: D. Elias Howe
Elias Howe patented the first practical lockstitch sewing machine in 1846. His design included a needle with an eye at the point and a shuttle. This invention greatly accelerated the production of clothing and footwear.
Who is the inventor of the mercury thermometer and the associated temperature scale?
Correct Answer: C. Daniel Gabriel Fahrenheit
Fahrenheit invented the mercury-in-glass thermometer in 1714. It provided much higher precision than earlier alcohol-based models. He also defined the freezing and boiling points of water as 32 and 212.
The gramophone, which used flat discs to record sound, was invented by?
Correct Answer: D. Emile Berliner
Emile Berliner invented the gramophone in 1887 as an improvement over the phonograph. It utilized flat discs which were easier to mass-produce than Edison's wax cylinders. This format dominated the music industry for nearly a century.
Who invented the first printing press with movable type in Europe around 1440?
Correct Answer: B. Johannes Gutenberg
Johannes Gutenberg developed the mechanical movable type printing press in Germany. This invention triggered the Printing Revolution and spread knowledge across the world. His most famous work is the Gutenberg Bible.