Problem: Knots do not necessarily influence the stiffness of structural timber, this will depend on the size and location. Stiffness and elastic strength are more dependent upon the sound wood than upon localized defects. The breaking strength is very susceptible to defects. Sound knots do not weaken wood when subject to compression parallel to the grain.
Depending on the placement and size of a knot, what property of structural timber can be affected?
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Answer: stiffness

Problem: Roads in the US have been paved with materials that include asphalt/bitumen since at least 1870, when a street in front of the Newark, NJ City Hall was paved. In many cases, these early pavings were made from naturally occurring "bituminous rock", such as at Ritchie Mines in Macfarlan in Ritchie County, West Virginia from 1852 to 1873. In 1876, asphalt-based paving was used to pave Pennsylvania Avenue in Washington, DC, in time for the celebration of the national centennial. Asphalt/bitumen was also used for flooring, paving and waterproofing of baths and swimming pools during the early 20th century, following similar trends in Europe.
What was Ritchie Mines used to waterproof during the 20th century?
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Answer: unanswerable

Problem: Elizabeth's personal fortune has been the subject of speculation for many years. Jock Colville, who was her former private secretary and a director of her bank, Coutts, estimated her wealth in 1971 at 2 million (equivalent to about 25 million today). In 1993, Buckingham Palace called estimates of 100 million "grossly overstated". She inherited an estimated 70 million estate from her mother in 2002. The Sunday Times Rich List 2015 estimated her private wealth at 340 million, making her the 302nd richest person in the UK.
What has been a subject of speculation concerning Elizabeth's wealth?
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Answer:
personal fortune