Everyday Inventions — Set 3
Inventions · रोजमर्रा के आविष्कार · Questions 21–30 of 70
The first mechanical clock, using a pendulum to keep accurate time, was invented by?
Correct Answer: D. Christian Huygens
Christian Huygens applied Galileo's observations of pendulums to create a highly accurate clock in 1656. Before this, clocks were unreliable and could lose several minutes a day. This invention was vital for navigation and scientific observation.
Who is known for the invention of the first practical photographic process, the Daguerreotype?
Correct Answer: C. Louis Daguerre
Louis Daguerre developed a method to capture images on silver-plated copper sheets in 1839. This was the first publicly available photographic process. It reduced the exposure time from several hours to just a few minutes.
The invention of the telegraph and the corresponding code for messages was by?
Correct Answer: C. Samuel Morse
Samuel Morse co-developed the electric telegraph and created the Morse Code system of dots and dashes. This allowed messages to be sent instantly across great distances for the first time. The first message sent was 'What hath God wrought'.
Which inventor developed the first successful alternating current (AC) motor?
Correct Answer: A. Nikola Tesla
Nikola Tesla designed the AC motor and transmission system which is now the global standard for electricity. His work won the 'War of Currents' against Edison's direct current (DC) system. AC is preferred because it can be easily stepped up or down for long-distance travel.
The first practical dishwasher, which used water pressure to clean plates, was patented by?
Correct Answer: D. Josephine Cochrane
Josephine Cochrane invented the first successful hand-powered dishwasher in 1886. She built it because she was tired of her servants chipping her fine china. It eventually became an essential appliance in modern kitchens.
Who is credited with the invention of the printing press with movable metal type around 1440?
Correct Answer: B. Johannes Gutenberg
Johannes Gutenberg's invention allowed books to be mass-produced for the first time in history. It played a key role in the spread of knowledge and the success of the Renaissance. The Gutenberg Bible was the first major book printed using this method.
The invention of the laser is primarily based on the theoretical work of which scientist?
Correct Answer: C. Albert Einstein
Albert Einstein proposed the concept of stimulated emission in 1917, which is the physical basis of lasers. The first working laser was later built by Theodore Maiman in 1960. Lasers are now used in everything from barcode scanners to surgery.
Which inventor is responsible for the development of the microwave oven in 1945?
Correct Answer: C. Percy Spencer
Percy Spencer discovered that microwaves could cook food when a chocolate bar melted in his pocket near a radar set. He then built the first 'Radarange' for commercial use. This invention significantly reduced cooking times in modern households.
The first practical hovercraft, capable of traveling over land and water, was invented by?
Correct Answer: A. Christopher Cockerell
Christopher Cockerell used a simple experiment with coffee tins to prove the principle of an air cushion. He patented the design in 1955 and saw it used for cross-channel ferries. Hovercrafts utilize high-pressure air to stay suspended just above the surface.
Who invented the first digital camera while working at Kodak in 1975?
Correct Answer: A. Steven Sasson
Steven Sasson built a prototype that was about the size of a toaster and took black-and-white photos. It used a CCD sensor to capture images and recorded them onto a cassette tape. This invention eventually led to the decline of traditional film photography.