TASK DEFINITION: This task is about creating an unanswerable question based on a given passage. Construct a question that looks relevant to the given context but is unanswerable. Following are a few suggestions about how to create unanswerable questions:
(i) create questions which require satisfying a constraint that is not mentioned in the passage
(ii) create questions which require information beyond what is provided in the passage in order to answer
(iii) replace an existing entity, number, date mentioned in the passage with other entity, number, date and use it in the question
(iv) create a question which is answerable from the passage and then replace one or two words by their antonyms or insert/remove negation words to make it unanswerable.
PROBLEM: Passage: The strength of the Viking influence on Old English appears from the fact that the indispensable elements of the language - pronouns, modals, comparatives, pronominal adverbs (like "hence" and "together"), conjunctions and prepositions - show the most marked Danish influence; the best evidence of Scandinavian influence appears in the extensive word borrowings for, as Jespersen indicates, no texts exist in either Scandinavia or in Northern England from this time to give certain evidence of an influence on syntax. The change to Old English from Old Norse was substantive, pervasive, and of a democratic character. Old Norse and Old English resembled each other closely like cousins and with some words in common, they roughly understood each other; in time the inflections melted away and the analytic pattern emerged. It is most "important to recognize that in many words the English and Scandinavian language differed chiefly in their inflectional elements. The body of the word was so nearly the same in the two languages that only the endings would put obstacles in the way of mutual understanding. In the mixed population which existed in the Danelaw these endings must have led to much confusion, tending gradually to become obscured and finally lost." This blending of peoples and languages happily resulted in "simplifying English grammar."

SOLUTION: What language was influenced by English as a result of Viking invasions?

PROBLEM: Passage: Today, the system of Arabic and Islamic education has grown and further integrated with Kerala government administration. In 2005, an estimated 6,000 Muslim Arabic teachers taught in Kerala government schools, with over 500,000 Muslim students. State-appointed committees, not private mosques or religious scholars outside the government, determine the curriculum and accreditation of new schools and colleges. Primary education in Arabic and Islamic studies is available to Kerala Muslims almost entirely in after-school madrasa programs - sharply unlike full-time madaris common in north India, which may replace formal schooling. Arabic colleges (over eleven of which exist within the state-run University of Calicut and the Kannur University) provide B.A. and Masters' level degrees. At all levels, instruction is co-educational, with many women instructors and professors. Islamic education boards are independently run by the following organizations, accredited by the Kerala state government: Samastha Kerala Islamic Education Board, Kerala Nadvathul Mujahideen, Jamaat-e-Islami Hind, and Jamiat Ulema-e-Hind.

SOLUTION: How many non-Muslim students are there in Kerala?

PROBLEM: Passage: In 1998, Netscape launched what was to become the Mozilla Foundation in an attempt to produce a competitive browser using the open source software model. That browser would eventually evolve into Firefox, which developed a respectable following while still in the beta stage of development; shortly after the release of Firefox 1.0 in late 2004, Firefox (all versions) accounted for 7% of browser use. As of August 2011, Firefox has a 28% usage share.

SOLUTION:
What did Firefox launch in 1998?