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: During the early 20th century, northerners were attracted to the city, and Miami prospered during the 1920s with an increase in population and infrastructure. The legacy of Jim Crow was embedded in these developments. Miami's chief of police, H. Leslie Quigg, did not hide the fact that he, like many other white Miami police officers, was a member of the Ku Klux Klan. Unsurprisingly, these officers enforced social codes far beyond the written law. Quigg, for example, "personally and publicly beat a colored bellboy to death for speaking directly to a white woman."

SOLUTION: Who was a unnotable chief of the Miami police?

PROBLEM: Passage: In its focus on the Caliphate, the party takes a different view of Muslim history than some other Islamists such as Muhammad Qutb. HT sees Islam's pivotal turning point as occurring not with the death of Ali, or one of the other four rightly guided Caliphs in the 7th century, but with the abolition of the Ottoman Caliphate in 1924. This is believed to have ended the true Islamic system, something for which it blames "the disbelieving (Kafir) colonial powers" working through Turkish modernist Mustafa Kemal Atatürk.

SOLUTION: What's the party's take on Muslim present?

PROBLEM: Passage: German cinema dates back to the very early years of the medium with the work of Max Skladanowsky. It was particularly influential during the years of the Weimar Republic with German expressionists such as Robert Wiene and Friedrich Wilhelm Murnau. The Nazi era produced mostly propaganda films although the work of Leni Riefenstahl still introduced new aesthetics in film. From the 1960s, New German Cinema directors such as Volker Schlöndorff, Werner Herzog, Wim Wenders, Rainer Werner Fassbinder placed West-German cinema back onto the international stage with their often provocative films, while the Deutsche Film-Aktiengesellschaft controlled film production in the GDR.

SOLUTION:
What was Max Skladanowsky active in during the Weimar Republic?