10 most difficult technical riddlesTechnical quiz
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
Who invented automatic car window cleaning device, called the windshield wiper?
Mary Anderson (1866 -1953) was an American real estate developer, rancher, viticulturist and inventor of the windshield wiper blade. In November 1903 Anderson was granted her first patent for an automatic car window cleaning device controlled from inside the car, called the windshield wiper. In 1922, Cadillac became the first car manufacturer to adopt them as standard equipment.
What was the name of the first semi-automatic pistol?
None of the above is a semi-automatic pistol
The Borchardt C-93 semi-automatic pistol was designed by Hugo Borchardt in 1893 based upon the Maxim toggle-bolt design.. With about 1,100 manufactured by Loewe and nearly 2,000 more produced by Deutsche Waffen und Munitionsfabriken, the Borchardt C-93 was the first mass-produced semi-automatic pistol.
Which company name is not an acronym?
Founded in 1976, today Acer is one of the world’s top ICT companies and has a presence in over 160 countries. As Acer looks into the future, it is focused on enabling a world where hardware, software and services will infuse with one another to open up new possibilities for consumers and businesses alike. The etymology of the company's name comes from the Latin word "acer" meaning "eager, vigorous, ".
What was the name of the first and only Soviet space shuttle?
Buran (Snowstorm or Blizzard) was the first spaceplane to be produced as part of the Soviet Buran programme. OK-1K1 completed one unmanned spaceflight in 1988, and was destroyed in 2002 It remains the only Soviet reusable spacecraft to be launched into space.
What is a tachymeter?
an instrument designed to measure angles and distances
device designed to measure the speed of vehicle movement
device for measuring the acceleration of heart rate
an instrument measuring the speed of rotation of the drive shaft in the engine
A tachymeter or tacheometer is a type of theodolite used for rapid measurements and determines, electronically or electro-optically, the distance to target. The principles of action are similar to those of rangefinders.
What was the Bessemer converter used for?
for cement production
during production of steel
The Bessemer bulb is a cylindrical refractory vessel used to make steel from pig iron. The process is named after its developer Henry Bessemer, who published it in England after the mid-19th century. The Bessemer process was the first inexpensive industrial process for the mass production of steel from molten pig iron before the development of the open hearth furnace.
What was the name of the first ocean-going ironclad?
The French ironclad La Gloire ("The Glory") was the first ocean-going ironclad, developed after the Crimean War and launched during 1859. However Gloire was soon itself rendered obsolete by the launching during 1860 of the British HMS Warrior, the world's first iron-hulled ironclad warship.
What is cementite in material science?
filler used in dentistry
heat-resistant alloy of iron and nickel
Cementite (or iron carbide) is a compound of iron and carbon, more precisely an intermediate transition metal carbide with the formula Fe3C. By weight, it is 6.67% carbon and 93.3% iron. It has an orthorhombic crystal structure.