QUES: Incandescent bulbs are much less efficient than most other types of electric lighting; incandescent bulbs convert less than 5% of the energy they use into visible light, with standard light bulbs averaging about 2.2%. The remaining energy is converted into heat. The luminous efficacy of a typical incandescent bulb is 16 lumens per watt, compared with 60 lm/W for a compact fluorescent bulb or 150 lm/W for some white LED lamps. Some applications of the incandescent bulb deliberately use the heat generated by the filament. Such applications include incubators, brooding boxes for poultry, heat lights for reptile tanks, infrared heating for industrial heating and drying processes, lava lamps, and the Easy-Bake Oven toy. Incandescent bulbs typically have short lifetimes compared with other types of lighting; around 1,000 hours for home light bulbs versus typically 10,000 hours for compact fluorescents and 30,000 hours for lighting LEDs.
What are more efficient than most other types of electric lighting?

ANS: unanswerable

QUES: Since World War II, aircraft carrier designs have increased in size to accommodate a steady increase in aircraft size. The large, modern Nimitz class of US carriers has a displacement nearly four times that of the World War II–era USS Enterprise, yet its complement of aircraft is roughly the same—a consequence of the steadily increasing size and weight of military aircraft over the years. Today's aircraft carriers are so expensive that nations which operate them risk significant political, economic, and military impact if a carrier is lost, or even used in conflict.
Why have aircraft carriers increased in size since World War I?

ANS: unanswerable

QUES: At the inception of the Premier League in 1992–93, just eleven players named in the starting line-ups for the first round of matches hailed from outside of the United Kingdom or Ireland. By 2000–01, the number of foreign players participating in the Premier League was 36 per cent of the total. In the 2004–05 season the figure had increased to 45 per cent. On 26 December 1999, Chelsea became the first Premier League side to field an entirely foreign starting line-up, and on 14 February 2005 Arsenal were the first to name a completely foreign 16-man squad for a match. By 2009, under 40% of the players in the Premier League were English.
Who became the first team to field an all domestic starting line up?

ANS: unanswerable

QUES: The last major attack on London was on 10/11 May 1941, on which the Luftwaffe flew 571 sorties and dropped 800 tonnes of bombs. This caused more than 2,000 fires. 1,436 people were killed and 1,792 seriously injured, which affected morale badly. Another raid was carried out on 11/12 May 1941. Westminster Abbey and the Law Courts were damaged, while the Chamber of the House of Commons was destroyed. One-third of London's streets were impassable. All but one railway station line was blocked for several weeks. This raid was significant, as 63 German fighters were sent with the bombers, indicating the growing effectiveness of RAF night fighter defences.
How many casualties were inflicted?

ANS:
1,436 people were killed and 1,792 seriously injured