QUES: The armillary sphere, a three-dimensional representation of the movements in the celestial sphere, was invented in Han China by the 1st century BC. Using a water clock, waterwheel and a series of gears, the Court Astronomer Zhang Heng (78139 AD) was able to mechanically rotate his metal-ringed armillary sphere. To address the problem of slowed timekeeping in the pressure head of the inflow water clock, Zhang was the first in China to install an additional tank between the reservoir and inflow vessel. Zhang also invented a seismometer (Houfeng didong yi ) in 132 AD to detect the exact cardinal or ordinal direction of earthquakes from hundreds of kilometers away. This employed an inverted pendulum that, when disturbed by ground tremors, would trigger a set of gears that dropped a metal ball from one of eight dragon mouths (representing all eight directions) into a metal toad's mouth.

Who was responsible for the invention of the seismometer?
What is the answer?
ANS: Zhang Heng
QUES: The island is subject to separate immigration controls from the remainder of Australia. Until recently immigration to Norfolk Island even by other Australian citizens was heavily restricted. In 2012, immigration controls were relaxed with the introduction of an Unrestricted Entry Permit for all Australian and New Zealand citizens upon arrival and the option to apply for residency; the only criteria are to pass a police check and be able to pay into the local health scheme. From 1 July 2016, the Australian migration system will replace the immigration arrangements currently maintained by the Norfolk Island Government.

When were the immigration protocols relaxed in Norfolk Island?
What is the answer?
ANS: 2012
QUES: There are a number of radio news agencies based in Somalia. Established during the colonial period, Radio Mogadishu initially broadcast news items in both Somali and Italian. The station was modernized with Russian assistance following independence in 1960, and began offering home service in Somali, Amharic and Oromo. After closing down operations in the early 1990s due to the civil war, the station was officially re-opened in the early 2000s by the Transitional National Government. In the late 2000s, Radio Mogadishu also launched a complementary website of the same name, with news items in Somali, Arabic and English.

When was the colonial period?
What is the answer?
ANS:
unanswerable