10 most difficult time riddles A list of time related questions that are most often answered incorrectly Technology quiz 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 7783 answers in 2 languages »geometry riddles » What is the highest time zone?UTC+14. Time zones range from UTC-12 to UTC+14. UTC+14 stretches as far as 30° east of the 180° longitude line and creates a large fold in the International Date Line. In Kiribati (UTC+14), the local time is the same as in Hawaiʻi (UTC−10:00), but the date is one day ahead. It is also 26 hours ahead of Baker Island (UTC−12:00).very hard 33% UTC0UTC014%UTC+12UTC+1233%UTC+14UTC+1433%UTC+24UTC+2418%Created by: globalquiz.org. Statistics based on 8369 answers in 4 languages »Oceania riddles » What was the exposure time of this photo?About 1 hour. The length of stars trails is pretty much the same as the distance travelled by an hour hand of clock during 30 minutes. But the Earth rotates twice as slow compared to the hour hand of a clock (one rotation per day, while clock's hour hand makes two).very hard 35% about 10 secondsabout 10 seconds17%about 10 minutesabout 10 minutes12%about 1 hourabout 1 hour35%about 8 hoursabout 8 hours33%Created by: globalquiz.org. Statistics based on 6185 answers in 2 languages »photography riddles » What are the most luminous objects in the universe?Quasars. A quasar is an extremely energetic source of radiation powered by accretion disc around galaxy's central supermassive black hole. Quasars were much more common in the early universe, as all known quasars are extremely distant.hard 41% supergiant starssupergiant stars8%novaenovae3%supernovaesupernovae46%quasarsquasars41%Created by: globalquiz.org. Statistics based on 8508 answers in 2 languages »universe riddles » World's fastest high-speed cameras were built to take photos of specific objects. What kind of objects?Nuclear bomb explosions. The rapatronic cameras are capable of recording a still image with an exposure time as brief as 10 nanoseconds (that would give 100 million frames per second if the camera was capable to do multiple pictures). The camera uses two polarizing filters mounted with their polarization angles at 90° to each other and a Faraday cell which briefly changes the polarization plane of light passing through it, acting as a shutter.hard 47% bullet shotsbullet shots19%rocket launchesrocket launches9%nuclear bomb explosionsnuclear bomb explosions47%sound wavessound waves23%Created by: Cleo. Statistics based on 7041 answers in 2 languages »technology riddles » Which large country uses UTC +5:30 time zone?India is one of the few countries that use single time zone with a 30-minute increment from UTC. The country's east–west distance covers 28 degrees of longitude, resulting in two hours difference in astronomical time. Since authorities decided to have one time zone for the whole country, they had to adjust it precisely.hard 47% ChinaChina23%IranIran14%IndiaIndia47%BrazilBrazil13%Created by: globalquiz.org. Statistics based on 14043 answers in 2 languages »geography of India riddles » Which day was the last of the 20th century?31 Dec 2000. There was no year number zero. So, the first century started on 1 Jan 1. Similarly, 21th century started 1 Jan 2001.average 64% 31 Dec 199931 Dec 199926%31 Dec 200031 Dec 200064%31 Dec 200131 Dec 20015%31 Dec 189931 Dec 18993%Created by: Jason Beagley. Statistics based on 17180 answers in 2 languages »calendar riddles » What is the stellar day?23 h 56 min 05 s. Sidereal time is a time-keeping system astronomers use to keep track of the direction to point their telescopes to view a given star in the night sky. It is a time scale that is based on the Earth's rate of rotation measured relative to the fixed stars rather than the Sun. average 65% 23 h 56 min 05 s23 h 56 min 05 s65%24 h 10 min 07 s24 h 10 min 07 s18%25 h 22 min 09 s25 h 22 min 09 s9%26 h 05 min 11 s26 h 05 min 11 s6%Created by: Krzysztof Moskal. Statistics based on 5301 answers in 4 languages »stars riddles » Who introduced the Gregorian calendar?Pope Gregory XIII. Gregory XIII was pope during the period from 13 May 1572 until 10 April 1585. The Gregorian calendar, also called the Western Calendar, was introduced by him in 1582 with the Bull Inter Gravissimas. The gregorian calendar basically a refinement of the Julian calendar. The Gregorian reform modified the Julian calendar's scheme of leap years, changing the mean length of the calendar year from 365.25 days to 365.2425 days.easy 71% Pope Gregory I, called the GreatPope Gregory I, called the Great17%St. Gregory the IlluminatorSt. Gregory the Illuminator3%Pope Gregory XIIIPope Gregory XIII71%GalileoGalileo6%Created by: Krzysztof Moskal. Statistics based on 8927 answers in 2 languages »popes riddles » Which of these countries first celebrate New Year?Australia. Sydney Time Zone is +10:00, so they celebrate New Year 4 and a half hours before India (+5:30), 10 hours before London, and 17 hours before Los Angeles (-7:00) .very easy 83% United StatesUnited States8%United KingdomUnited Kingdom3%IndiaIndia5%AustraliaAustralia83%Created by: Cleo. Statistics based on 6420 answers in 2 languages »Australia riddles » Play technology quiz and see all the questions.