10 most difficult technology riddles A list of ten (out of 162) 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 4076 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%oxygenoxygen21%ironiron29%siliconsilicon20%Created by: globalquiz.org. Statistics based on 8626 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-resistant40%it is more explosiveit is more explosive14%Created by: globalquiz.org. Statistics based on 6420 answers in 2 languages »navy riddles » Who discovered the rubber vulcanization process?Charles Goodyear for many years improved the method of hardening the rubber. When he succeeded in 1839, investors were already offended by earlier failures. Charles died in misery, and Goodyear company, named in his honor, has nothing to do with him.very hard 30% Charles GoodyearCharles Goodyear30%John Boyd DunlopJohn Boyd Dunlop25%Edouard MichelinEdouard Michelin29%Giovanni Battista PirelliGiovanni Battista Pirelli13%Created by: GabrielBaran. Statistics based on 12312 answers in 2 languages »tires 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 31% low speedlow speed28%low durabilitylow durability11%lack of possibility to use metallic cartridgeslack of possibility to use metallic cartridges31%poor shooting precisionpoor shooting precision28%Created by: globalquiz.org. Statistics based on 8811 answers in 4 languages »firearms 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 32% 666%121221%222232%242439%Created by: globalquiz.org. Statistics based on 9863 answers in 2 languages »time 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 hour30%2½ hours2½ hours32%2 days2 days3%Created by: globalquiz.org. Statistics based on 4698 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 5792 answers in 2 languages »optics 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 32% octaloctal22%binarybinary20%decimaldecimal24%sexagesimalsexagesimal32%Created by: smyru. Statistics based on 12794 answers in 2 languages »numbers 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 13772 answers in 2 languages »elements riddles » Play technology quiz and see all the questions.