10 most difficult technology riddles A list of ten (out of 156) technology related questions that are the most often answered incorrectly Technology quiz Are gas fittings tightened clockwise or anti-clockwise?It depends on the gas. 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.very hard 28% clockwiseclockwise23%anti-clockwiseanti-clockwise39%it depends on the gasit depends on the gas28%there is no standardthere is no standard8%Created by: globalquiz.org. Statistics based on 3919 answers in 4 languages »gases riddles » What is the most common element (by mass) forming the planet Earth?Iron is most abundant in the Earth's outer and inner core, and it is the fourth most common element in the Earth's crust.very hard 29% carboncarbon28%oxygenoxygen20%ironiron29%siliconsilicon20%Created by: globalquiz.org. Statistics based on 8375 answers in 2 languages »Earth riddles » 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. 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.very hard 29% it burns slowerit burns slower29%it burns quickerit burns quicker15%it is water-resistantit is water-resistant41%it is more explosiveit is more explosive14%Created by: globalquiz.org. Statistics based on 6143 answers in 2 languages »navy riddles » What was the main weakness of Colt revolvers, comparing to its competitors?Lack of possibility to use metallic cartridges. Samuel Colt missed a great opportunity in firearms development when he dismissed an idea from one of his gunsmiths, Rollin White. White proposed a "bored-through" revolver cylinder to allow the use of metallic cartridges in a handgun. After Colt fired White for suggesting an improvement to his revolver, White took his idea to Colt's competitor, Smith & Wesson, who patented his invention and kept Colt from being able to build cartridge firearms for almost 20 years.very hard 30% low speedlow speed28%low durabilitylow durability11%lack of possibility to use metallic cartridgeslack of possibility to use metallic cartridges30%poor shooting precisionpoor shooting precision29%Created by: globalquiz.org. Statistics based on 8347 answers in 4 languages »inventors riddles » During a full 24-hour day, how many times would the hands of a clock overlap?22. The minute hand makes 24 revolutions, while the hour hand makes 2 revolutions.very hard 31% 666%121221%222231%242440%Created by: globalquiz.org. Statistics based on 9395 answers in 2 languages »time riddles » Which numeral system was in use in ancient Sumer and Babilon?Sexagesimal. Remnants of highly composite sexagesimal system are in use even today for measuring angles, geographic coordinates and especially time. An hour of time is divided into 60 minutes, which in turn are divided into 60 seconds. very hard 31% octaloctal23%binarybinary20%decimaldecimal25%sexagesimalsexagesimal31%Created by: smyru. Statistics based on 12281 answers in 2 languages »numbers riddles » How long did Neil Armstrong’s first moon walk last?2½ hours. Each of the subsequent five Apollo program landings were allotted gradually longer periods for EVA activities – the crew of Apollo 17, by comparison, spent over 22 hours exploring the lunar surface.very hard 32% 2 minutes2 minutes32%½ hour½ hour31%2½ hours2½ hours32%2 days2 days3%Created by: globalquiz.org. Statistics based on 4545 answers in 2 languages »Moon riddles » What term would photographers use to describe the quality of blurred part of the photo? Bokeh has been defined as "the way the lens renders out-of-focus points of light". It can be good or unpleasant, depending on the lens aberrations and aperture shape. The term comes from Japanese for "blur".very hard 32% diffractiondiffraction33%bokehbokeh32%outfieldoutfield19%overexposureoverexposure13%Created by: globalquiz.org. Statistics based on 5653 answers in 2 languages »optics riddles » This is an iron buoy. Where were its atoms formed?In a high-mass star preceding Sun. Radioactive nickel-56 (which decays to the most common isotope of iron) is the last element to be produced before the collapse of a supernova. That is why the iron was abundantly scattered into space after the supernova explosion.very hard 34% in a high-mass star preceding Sunin a high-mass star preceding Sun34%in the Sunin the Sun8%in the Earth's corein the Earth's core29%in the Earth's crustin the Earth's crust28%Created by: life-o-holic. Statistics based on 13343 answers in 2 languages »elements riddles » How many shots did color photography pioneers take for every photo?3. The first permanent color photographs were taken using the three-color-separation principle first published by physicist James Clerk Maxwell in 1855. Maxwell's idea was to take three separate black-and-white photographs through red, green and blue filters. This technique was used by Prokudin-Gorskii in this photo of Austro-Hungarian POWs.very hard 34% 1116%229%3334%10-2010-2040%Created by: globalquiz.org. Statistics based on 3907 answers in 2 languages »history of photography riddles » Play technology quiz and see all the questions.