Inventions — Set 3
Physics · आविष्कार · Questions 21–30 of 60
Who invented the first alternating current (AC) motor?
Correct Answer: A. Nikola Tesla
Nikola Tesla designed the induction motor which operates on alternating current. His invention proved more efficient than the direct current motors promoted by Edison. AC power eventually became the standard for modern electrical power grids worldwide.
The invention of the hydraulic press is attributed to?
Correct Answer: A. Joseph Bramah
Joseph Bramah invented the hydraulic press based on Pascal's principle of fluid pressure. The device uses liquid to multiply force, allowing for the lifting of heavy loads. It is a fundamental tool used in manufacturing and heavy industry today.
Who is credited with inventing the first commercially successful typewriter?
Correct Answer: D. Christopher Sholes
Christopher Sholes developed the QWERTY keyboard layout to prevent mechanical keys from jamming. His design was later manufactured by the Remington company in the late 1800s. The QWERTY layout remains the standard for modern computer keyboards today.
The invention of the microwave oven was an accidental discovery by?
Correct Answer: D. Percy Spencer
Percy Spencer noticed a candy bar melting in his pocket while working with radar magnetrons. He realized that microwave energy could cook food rapidly from the inside out. The first commercial microwave ovens were marketed under the name 'Radarange'.
Which scientist invented the spectroscope to analyze light?
Correct Answer: C. Joseph von Fraunhofer
Joseph von Fraunhofer invented the spectroscope to observe dark lines in the solar spectrum. These lines, now named after him, reveal the chemical composition of stars and gases. Spectroscopy is essential for modern astronomy and chemical analysis of materials.
Who invented the safety pin in its modern form?
Correct Answer: A. Walter Hunt
Walter Hunt invented the safety pin in 1849 to pay off a small debt. He sold the patent for a few hundred dollars, missing out on millions in royalties. The design uses a coiled spring and a clasp to protect the user.
The first practical internal combustion engine was developed by?
Correct Answer: B. Nikolaus Otto
Nikolaus Otto developed the four-stroke engine cycle, which is still used in most cars today. This engine compressed fuel and air before ignition to produce significant power. His invention paved the way for the development of the modern automobile industry.
Which inventor created the first photographic film in rolls?
Correct Answer: A. George Eastman
George Eastman founded Kodak and invented flexible roll film to replace heavy glass plates. This invention made photography accessible to the general public for the first time. He later introduced the first mass-market camera called the 'Kodak' in 1888.
Who invented the Bunsen burner used in laboratories?
Correct Answer: A. Robert Bunsen
Robert Bunsen developed this burner to produce a clean, hot, and soot-free flame. It works by mixing gas with air before combustion to achieve higher temperatures. It remains a standard piece of equipment in chemistry labs around the world.
The invention of the electrocardiogram (ECG) is credited to?
Correct Answer: A. Willem Einthoven
Willem Einthoven developed the first practical ECG to record the electrical activity of the heart. He assigned the letters P, Q, R, S, and T to the various deflections. He was awarded the Nobel Prize in Medicine for this vital contribution.