Problem: Incandescent light bulb:

This means that a 5% reduction in operating voltage will more than double the life of the bulb, at the expense of reducing its light output by about 16%. This may be a very acceptable trade off for a light bulb that is in a difficult-to-access location (for example, traffic lights or fixtures hung from high ceilings). Long-life bulbs take advantage of this trade-off. Since the value of the electric power they consume is much more than the value of the lamp, general service lamps emphasize efficiency over long operating life. The objective is to minimize the cost of light, not the cost of lamps. Early bulbs had a life of up to 2500 hours, but in 1924 a cartel agreed to limit life to 1000 hours. When this was exposed in 1953, General Electric and other leading American manufacturers were banned from limiting the life.

What is an unacceptable trade off foe a light bulb in a difficult to access location?
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A: unanswerable

Problem: Czech language:

Typical of Slavic languages, Czech marks its verbs for one of two grammatical aspects: perfective and imperfective. Most verbs are part of inflected aspect pairsfor example, koupit (perfective) and kupovat (imperfective). Although the verbs' meaning is similar, in perfective verbs the action is completed and in imperfective verbs it is ongoing. This is distinct from past and present tense, and any Czech verb of either aspect can be conjugated into any of its three tenses. Aspect describes the state of the action at the time specified by the tense.

What are time measurements part of?
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A: unanswerable

Problem: Mary (mother of Jesus):

In the Catholic Church, Mary is accorded the title "Blessed", (from Latin beatus, blessed, via Greek , makarios and Latin facere, make) in recognition of her assumption to Heaven and her capacity to intercede on behalf of those who pray to her. Catholic teachings make clear that Mary is not considered divine and prayers to her are not answered by her, they are answered by God. The four Catholic dogmas regarding Mary are: Mother of God, Perpetual virginity of Mary, Immaculate Conception (of Mary) and Assumption of Mary.

What title is given to Mary in the Catholic Church?
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A: Blessed

Problem: Eton College:

In the past, people at Eton have occasionally been guilty of antisemitism. For a time, new admissions were called 'Jews' by their fellow Collegers. In 1945, the school introduced a nationality statute conditioning entry on the applicant's father being British by birth. The statute was removed after the intervention of Prime Minister Harold Macmillan in the 1960s after it came to the attention of Oxford's Wykeham Professor of Logic, A. J. Ayer, himself Jewish and an Old Etonian, who "suspected a whiff of anti-semitism".

In what year did A.J. Ayer graduate from Eton?
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A:
unanswerable