Physics Inventions — Set 7
Inventions · भौतिकी के आविष्कार · Questions 61–70 of 70
Who is known for inventing the first chemical battery?
Correct Answer: D. Alessandro Volta
Volta created the 'Voltaic Pile' in 1800, the world's first true battery. This device provided the first steady source of electric current. The 'Volt' is the standard unit of electric potential named after him.
The invention of the safety elevator belongs to?
Correct Answer: A. Elisha Otis
Elisha Otis invented the safety brake mechanism for elevators in 1852. This device prevented the elevator from falling if the hoisting cable failed. His invention made the construction of skyscrapers possible.
Who invented the first practical wireless telegraph system?
Correct Answer: D. Guglielmo Marconi
Marconi developed the first long-distance wireless telegraphy system in the late 1890s. He successfully transmitted a transatlantic radio signal in 1901. He is often called the 'Father of Radio'.
The first modern internal combustion engine was developed by?
Correct Answer: B. Nikolaus Otto
Nikolaus Otto built the first four-stroke internal combustion engine in 1876. This cycle, known as the 'Otto Cycle', remains the basis for most gasoline engines. It triggered a revolution in land-based transport.
Who invented the gramophone used for playing records?
Correct Answer: D. Emile Berliner
Emile Berliner invented the gramophone in 1887 using flat discs instead of cylinders. This design was much easier to mass-produce than earlier phonographs. The gramophone became the standard audio player for decades.
The invention of the stethoscope is credited to?
Correct Answer: B. René Laennec
Laennec invented the stethoscope in 1816 while working at a hospital in Paris. He originally used a rolled-up paper cylinder to listen to chest sounds. This tool is now a symbol of the medical profession.
Who invented the first successful printing press in Europe?
Correct Answer: B. Johannes Gutenberg
Gutenberg introduced movable type to Europe around 1440. His invention allowed for the mass production of books and the spread of literacy. The Gutenberg Bible was the first major book printed using this method.
The first practical mechanical clock was invented in which century?
Correct Answer: A. 13th Century
Mechanical clocks began appearing in Europe during the late 13th century. They initially used weights and a verge escapement to keep time. These clocks were usually large and installed in cathedral towers.
Who invented the first laser device?
Correct Answer: B. Theodore Maiman
Maiman built the first functioning laser in 1960 using a synthetic ruby crystal. The term 'laser' stands for Light Amplification by Stimulated Emission of Radiation. Lasers are now used in everything from barcode scanners to surgery.
The invention of the telescope is most commonly associated with?
Correct Answer: A. Hans Lippershey
Hans Lippershey, a Dutch eyeglass maker, applied for the first telescope patent in 1608. Galileo later improved the design and used it for astronomical observations. The device uses lenses to magnify distant objects.