10 most difficult technology riddlesTechnology quiz
When was the first machine gun patented?
On May 15, 1718, Englishman James Puckle patented his machine gun, the world's first! You may have thought the Gatling gun or the Maxim machine gun was the first machine gun, but depending on how you define “machine gun” James Puckle, Esq. (yes, he was a lawyer) got there first.
What does the logo of Citroën symbolize?
Spruce, typical for the Vosges
Upwards pointing arrow - strive for perfection
Chevrons referring to the military connections of the company
The origin of the logo may be traced back to a trip made by the 22-year-old André Citroën to Łódź city, Poland, where he discovered an innovative design for a chevron-shaped gear used in milling. He bought the patent for its application in steel and started his company which initially produced gears.
Who in 1838 invented stereoscopic apparatus?
The original stereoscopic apparatus was invented in 1838 by Sir Charles Wheatstone from Gloucestershire, in the year of the birth of photography, yet his early experiments employed drawings instead of photographs, viewed through a system of angled mirrors.
Cranberry glass is made by adding ..?
Cranberry glass or 'Gold Ruby' glass is a red glass made by adding gold salts or colloidal gold to molten glass. The glass is typically hand blown or molded. Legend holds that cranberry glass was first discovered when a noble tossed a gold coin into a mixture of molten glass
What was the first car equipped with an airbag?
Cadillac de Ville
1974 in Cadillac de Ville also saw the introduction of the optional "Air Cushion Restraint System". Known today as airbags, this option provided protection for front seat occupants in the case of a frontal collision. One bag was located in the steering wheel, the other in the dashboard in front of the front seat passenger.
Which type of transmission uses the shortest waves?
The Ku band is the portion of the electromagnetic spectrum in the microwave range of frequencies from 12 to 18 gigahertz (GHz). Ku band is primarily used for satellite communications, most notably for fixed and broadcast services, and for specific applications such as NASA's Tracking Data Relay Satellite used for both space shuttle and International Space Station
Are gas fittings tightened clockwise or anti-clockwise?
it depends on the gas
there is no standard
Some gas fittings use reverse threads to prevent disastrous misconnections. For example, oxygen fittings are right-handed, but acetylene and other flammable gases use left-handed fittings.
Use of brown powder was one of the major naval artillery improvements of the late 19th century. What was its advantage over black powder?
it burns slower
it burns quicker
it is water-resistant
it is more explosive
The introduction of brown powder, which burned less rapidly than black powder, allowed to use longer barrels, which resulted in greater accuracy. Slower-burning powder decreases firing stresses, allowing guns to last longer and to be manufactured to tighter tolerances.