10 most difficult time riddles A list of time related questions that are most often answered incorrectly Astronomy quiz In what period of time does the Sun make a full turn around the center of the Milky Way?Within every 225 million years. The sun performs a full turn around the center of our galaxy during 225 million years.very hard 27% within every 225 million yearswithin every 225 million years27%within 250 million yearswithin 250 million years32%within 300 million yearswithin 300 million years23%within 350 million yearswithin 350 million years16%Created by: Tschuka. Statistics based on 827 answers in 3 languages »Sun 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 34% 666%121220%222234%242438%Created by: globalquiz.org. Statistics based on 11233 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 34% UTC0UTC013%UTC+12UTC+1233%UTC+14UTC+1434%UTC+24UTC+2418%Created by: globalquiz.org. Statistics based on 12287 answers in 5 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 seconds16%about 10 minutesabout 10 minutes12%about 1 hourabout 1 hour35%about 8 hoursabout 8 hours34%Created by: globalquiz.org. Statistics based on 8280 answers in 2 languages »photography riddles » Which planet’s day lasts longer than its year?Venus year (the time it takes it to rotate around the Sun) is equal to 225 Earth days, and its day (the time it takes it to rotate on its axis) equals 243 Earth days. very hard 38% VenusVenus38%MercuryMercury20%Jupiter Jupiter 16%NeptunNeptun24%Created by: Tschuka. Statistics based on 1460 answers in 3 languages »Solar System 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 42% supergiant starssupergiant stars7%novaenovae3%supernovaesupernovae46%quasarsquasars42%Created by: globalquiz.org. Statistics based on 13057 answers in 3 languages »light 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 shots18%rocket launchesrocket launches9%nuclear bomb explosionsnuclear bomb explosions47%sound wavessound waves24%Created by: Cleo. Statistics based on 11064 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% ChinaChina24%IranIran14%IndiaIndia47%BrazilBrazil13%Created by: globalquiz.org. Statistics based on 18743 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 65% 31 Dec 199931 Dec 199925%31 Dec 200031 Dec 200065%31 Dec 200131 Dec 20015%31 Dec 189931 Dec 18992%Created by: Jason Beagley. Statistics based on 22433 answers in 3 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 9003 answers in 5 languages »stars riddles » Play astronomy quiz and see all the questions.