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.
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Question: Passage: There were 112,608 households in the city in 2000, of which 26.5% included children below the age of 18, 39.5% were composed of married couples living together, 11.4% reported a female householder with no husband present, and 45.5% classified themselves as nonfamily. Unmarried partners were present in 2.2% of households. In addition, 33.1% of all households were composed of individuals living alone, of which 6.2% was someone 65 years of age or older. The average household size in Raleigh was 2.30 persons, and the average family size was 2.97 persons.

Answer: How many households were there in 2001?


Question: Passage: Furthermore, in terms of job prospects, as of 2014 the average starting salary of an Imperial graduate was the highest of any UK university. In terms of specific course salaries, the Sunday Times ranked Computing graduates from Imperial as earning the second highest average starting salary in the UK after graduation, over all universities and courses. In 2012, the New York Times ranked Imperial College as one of the top 10 most-welcomed universities by the global job market. In May 2014, the university was voted highest in the UK for Job Prospects by students voting in the Whatuni Student Choice Awards Imperial is jointly ranked as the 3rd best university in the UK for the quality of graduates according to recruiters from the UK's major companies.

Answer: What collegege had the highest higher rate in 2014 among graduates?


Question: Passage: Sensory memory holds sensory information less than one second after an item is perceived. The ability to look at an item and remember what it looked like with just a split second of observation, or memorization, is the example of sensory memory. It is out of cognitive control and is an automatic response. With very short presentations, participants often report that they seem to "see" more than they can actually report. The first experiments exploring this form of sensory memory were conducted by George Sperling (1963) using the "partial report paradigm". Subjects were presented with a grid of 12 letters, arranged into three rows of four. After a brief presentation, subjects were then played either a high, medium or low tone, cuing them which of the rows to report. Based on these partial report experiments,Sperling was able to show that the capacity of sensory memory was approximately 12 items, but that it degraded very quickly (within a few hundred milliseconds). Because this form of memory degrades so quickly, participants would see the display but be unable to report all of the items (12 in the "whole report" procedure) before they decayed. This type of memory cannot be prolonged via rehearsal.

Answer:
How long does sensory memory store presentations?