The shifting of the capital of British India from Calcutta to Delhi was announced at the Delhi Durbar of

The correct answer is C, the Delhi Metro Rail Corporation. The Delhi Metro was the first metro and rail based system in the world to be certified by the United Nations for earning carbon credits, because its regenerative braking returns electricity to the grid each time a train slows. It also built solar plants at its stations and depots and uses rainwater harvesting and green buildings, which is why it is described as the first completely green metro.

Option A, the Hong Kong Mass Transit Railway, and option B, the Singapore Mass Rapid Transit, are both older and efficient systems but did not take the carbon credit route first. Option D, the London Underground, opened in 1863 and is the oldest underground railway in the world, which makes it the natural trap for a candidate who reads first as oldest. The Delhi Metro Rail Corporation itself was set up in 1995 and its first stretch opened in December 2002.

The correct answer is A, the Sixty-ninth Amendment Act of 1991. It inserted Articles 239AA and 239AB into the Constitution, renamed the union territory of Delhi as the National Capital Territory of Delhi and gave it a legislative assembly and a council of ministers, with the arrangement coming into force in February 1992. The assembly can legislate on the State and Concurrent Lists except on public order, police and land.

Option B, the Seventy-third Amendment of 1992, added Part IX and gave constitutional status to panchayats. Option D, the Seventy-fourth Amendment of the same year, did the same for municipalities, and the two are often confused with this one because their dates are close. Option C, the Sixty-first Amendment of 1988, lowered the voting age from twenty-one years to eighteen. Only the Sixty-ninth deals with Delhi.

The correct answer is B, 70. The Delhi Legislative Assembly has seventy seats, all filled by direct election, and the Council of Ministers may not be larger than a tenth of that strength, which means at most seven ministers including the Chief Minister. Delhi also elects seven members to the Lok Sabha and its assembly elects three members to the Rajya Sabha.

Option A, sixty, is the strength of the assemblies of Goa, Manipur, Tripura, Mizoram, Nagaland and Arunachal Pradesh, which is why it feels plausible. Option C, ninety, is the strength of the Chhattisgarh assembly and close to that of Haryana. Option D, forty, is the strength of the Sikkim assembly and of Puducherry's elected members. The pair to fix in memory is Delhi seventy seats and seven Lok Sabha members.

The correct answer is A, Edwin Lutyens and Herbert Baker. After the 1911 announcement the two British architects planned the new capital, Lutyens designing the Viceroy's House, now Rashtrapati Bhavan, and laying out the central vista, while Baker designed the two Secretariat blocks on Raisina Hill and the circular Council House that became Parliament House. The city was formally inaugurated in 1931.

Option B, Le Corbusier with Pierre Jeanneret, planned Chandigarh in the 1950s. Option C names two of India's best known modern architects, of whom Charles Correa planned Navi Mumbai's central business district, but neither worked on New Delhi. Option D names planners associated with Bhubaneswar and with the early Chandigarh plan. Only Lutyens and Baker belong to New Delhi, whose central area is still called Lutyens Delhi.

The correct answer is C, the Red Fort Complex. Shah Jahan built the fort between 1639 and 1648 as the citadel of his new capital Shahjahanabad, and it was inscribed on the World Heritage List in 2007. The Prime Minister raises the national flag and speaks from its ramparts on Independence Day, and its buildings include the Diwan-i-Aam, the Diwan-i-Khas, the Rang Mahal and the Moti Masjid.

Option A, the Qutub Minar and its monuments, and option B, Humayun's Tomb, were both inscribed earlier, in 1993, and are the two older Delhi entries. Option D, the Jantar Mantar of Delhi, is not on the list at all; it is the Jantar Mantar of Jaipur that was inscribed, in 2010. So Delhi has three World Heritage Sites in all, two from 1993 and one from 2007.