Physics Inventions — Set 3
Inventions · भौतिकी के आविष्कार · Questions 21–30 of 70
Who invented the first internal combustion engine fueled by gasoline?
Correct Answer: D. Karl Benz
Karl Benz is widely regarded as the inventor of the first modern automobile. He patented the three-wheeled Motorwagen in 1886. This invention marked the beginning of the global automotive industry.
The first practical air conditioner was designed by which engineer in 1902?
Correct Answer: A. Willis Carrier
Willis Carrier invented the first modern electrical air conditioning unit. It was originally built to control humidity in a printing plant. His invention led to increased productivity and comfort in various sectors.
Who invented the hovercraft, a vehicle that travels on a cushion of air?
Correct Answer: A. Christopher Cockerell
Sir Christopher Cockerell invented the hovercraft in 1956. He used a coffee tin and a hairdryer to demonstrate his ring-jet principle. This vehicle can travel over both land and water surfaces.
The first automatic revolving door was patented by which inventor in 1888?
Correct Answer: D. Theophil Van Kannel
Theophil Van Kannel invented the revolving door to prevent drafts and noise from entering buildings. He was reportedly motivated by a dislike of social conventions like holding doors open. It is also highly energy efficient for climate-controlled buildings.
Which scientist invented the reflecting telescope using a curved mirror?
Correct Answer: B. Isaac Newton
Isaac Newton built the first reflecting telescope to avoid chromatic aberration. This design uses a concave mirror to focus light instead of a lens. Most modern professional telescopes use a variation of this Newtonian design.
The first successful flying machine, the airplane, was invented and flown by?
Correct Answer: B. The Wright Brothers
Orville and Wilbur Wright made the first controlled, powered flight in 1903. The flight took place at Kitty Hawk, North Carolina. Their success relied on innovative wing warping and control systems.
Who invented the first X-ray machine after discovering X-rays in 1895?
Correct Answer: B. Wilhelm Röntgen
Wilhelm Röntgen discovered X-rays while experimenting with cathode rays. He took the first medical X-ray of his wife's hand. He received the first-ever Nobel Prize in Physics for this monumental discovery.
The world's first electronic general-purpose computer (ENIAC) was designed by?
Correct Answer: D. John Mauchly and J. Presper Eckert
The correct answer is 'John Mauchly and J. Presper Eckert'. ENIAC was built at the University of Pennsylvania during World War II. It was a massive machine used to calculate artillery firing tables. It laid the foundation for the entire digital computer era.
Who invented the bifocal lens for spectacles?
Correct Answer: C. Benjamin Franklin
Benjamin Franklin invented bifocals to correct both near and far vision. He achieved this by cutting two different lenses in half and mounting them together. He was tired of switching between two pairs of glasses constantly.
Which inventor is known as the 'Father of the Centigrade Scale'?
Correct Answer: A. Anders Celsius
Anders Celsius proposed a 100-degree temperature scale in 1742. Originally, he set 0 as the boiling point and 100 as the freezing point. The scale was later reversed to its current form by Carolus Linnaeus.