Problem: Calcutta (now Kolkata) was the capital of India during the British Raj until December 1911. However, Delhi had served as the political and financial centre of several empires of ancient India and the Delhi Sultanate, most notably of the Mughal Empire from 1649 to 1857. During the early 1900s, a proposal was made to the British administration to shift the capital of the British Indian Empire (as it was officially called) from Calcutta to Delhi. Unlike Calcutta, which was located on the eastern coast of India, Delhi was at the centre of northern India and the Government of British India felt that it would be logistically easier to administer India from the latter rather than the former.
What is the name of the empire for which Delhi served as the political and financial capital from 1649 to 1857?
The answer is the following: Mughal Empire

Problem: In 1839, Melbourne resigned after Radicals and Tories (both of whom Victoria detested) voted against a bill to suspend the constitution of Jamaica. The bill removed political power from plantation owners who were resisting measures associated with the abolition of slavery. The Queen commissioned a Tory, Sir Robert Peel, to form a new ministry. At the time, it was customary for the prime minister to appoint members of the Royal Household, who were usually his political allies and their spouses. Many of the Queen's ladies of the bedchamber were wives of Whigs, and Peel expected to replace them with wives of Tories. In what became known as the bedchamber crisis, Victoria, advised by Melbourne, objected to their removal. Peel refused to govern under the restrictions imposed by the Queen, and consequently resigned his commission, allowing Melbourne to return to office.
Who voted against the bill to end the constitution of Jamaica?
The answer is the following: Radicals and Tories

Problem: Although Kim's early successes had led him to predict that he would end the war by the end of August, Chinese leaders were more pessimistic. To counter a possible U.S. deployment, Zhou Enlai secured a Soviet commitment to have the Soviet Union support Chinese forces with air cover, and deployed 260,000 soldiers along the Korean border, under the command of Gao Gang. Zhou commanded Chai Chengwen to conduct a topographical survey of Korea, and directed Lei Yingfu, Zhou's military advisor in Korea, to analyze the military situation in Korea. Lei concluded that MacArthur would most likely attempt a landing at Incheon. After conferring with Mao that this would be MacArthur's most likely strategy, Zhou briefed Soviet and North Korean advisers of Lei's findings, and issued orders to Chinese army commanders deployed on the Korean border to prepare for American naval activity in the Korea Strait.
Where did the Chinese military deploy troops in preparation for the arrival of US troops?
The answer is the following: the Korean border

Problem: The difference in the above factors for the case of =0 is the reason that most broadcasting (transmissions intended for the public) uses vertical polarization. For receivers near the ground, horizontally polarized transmissions suffer cancellation. For best reception the receiving antennas for these signals are likewise vertically polarized. In some applications where the receiving antenna must work in any position, as in mobile phones, the base station antennas use mixed polarization, such as linear polarization at an angle (with both vertical and horizontal components) or circular polarization.
What is one use that would require an antenna to receive signals in various ways at once?
The answer is the following:
mobile phones