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06 Feb 2020, 06:59
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E
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
85%
(hard)
Question Stats:
50% (02:17) correct
50%
(02:25)
wrong
based on 933
sessions
History
Date
Time
Result
Not Attempted Yet
The key for a modern 12-pin cylinder lock mechanism – one of the most secure locking mechanisms – has a cylindrical shape with multiple protrusions in various distinct orientations, making it one of the most difficult keys to mold. Recent archaeological excavations in Uganda unravelled a small piece of a key-like structure belonging to the 10th Century B.C. The excavated piece contains 8 pins with orientations of the pins and the shape of the pins similar to that in a 12-pin cylinder key. Archaeologists therefore hypothesize that the 12-pin cylinder lock mechanism has been in existence for more than 3 millennia.
Which of the following statements, if true, provides the best support for the archaeologists’ hypothesis?
A. The key is made from ivory – a material obtained from the tusks of elephants and the horns of rhinos, animals that were likely to have evolved in Uganda.
B. The cylinder lock mechanism is the most secure locking mechanism that could have been created by Neanderthals given their relatively unevolved intellectual capacity.
C. No lock mechanism that uses a similar cylinder-based mechanism could have existed prior to or around 10th Century B.C.
D. The construction of a cylinder lock and the intricacies behind its workings were definitely known during the 9th Century A.D., a recent evidence suggests.
E. The material used in the key would be malleable enough for creating 12 such distinctly oriented protrusions on the same cylindrical structure.
Which of the following statements, if true, provides the best support for the archaeologists’ hypothesis?
A. The key is made from ivory – a material obtained from the tusks of elephants and the horns of rhinos, animals that were likely to have evolved in Uganda.
B. The cylinder lock mechanism is the most secure locking mechanism that could have been created by Neanderthals given their relatively unevolved intellectual capacity.
C. No lock mechanism that uses a similar cylinder-based mechanism could have existed prior to or around 10th Century B.C.
D. The construction of a cylinder lock and the intricacies behind its workings were definitely known during the 9th Century A.D., a recent evidence suggests.
E. The material used in the key would be malleable enough for creating 12 such distinctly oriented protrusions on the same cylindrical structure.
06 Feb 2020, 08:42
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I am writing this before the official answer is released.
I feel the answer is E.
My reasoning is as follows. If an 8 pin key was discovered, it is logical to assume that in 10th century BC, some people would have gone further and tried creating a 12 pin cylinder lock mechanism, provided that the material, which they are using as key, is malleable enough to allow a 12 pin key. I could be wrong. If you think my reasoning is incorrect, or that there is a better answer, please shed some light on the same.
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I feel the answer is E.
My reasoning is as follows. If an 8 pin key was discovered, it is logical to assume that in 10th century BC, some people would have gone further and tried creating a 12 pin cylinder lock mechanism, provided that the material, which they are using as key, is malleable enough to allow a 12 pin key. I could be wrong. If you think my reasoning is incorrect, or that there is a better answer, please shed some light on the same.
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06 Feb 2020, 09:28
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lnm87
CR questions are all about addressing assumptions you uncover when diagramming your argument. Lets chart it out real quick
--- > 12 pin lock cylidrical, secure, lots of protrusions
---> Design makes it difficult to mold
---> Archelogists discover part of key like structure with 8 pins similar shape, orientation to 12 pin 10th cent BC
C: 12 pin has been around >3k years
now we have to look for unstated assumptions
One assumption we have to make to accept the conclusion is that this 8 pin piece is not trying to be part of some other design different from the 12 pin
Lets look at answer choices. Any answer choice that address this unstated assumption is a strengthener
A) key is made from ivory, prob from rhnios, evolved in the area - ok so the key is made from materials from the area it was found. This is out of scope. The materials used to make the key are irrelevant. Even if the key was made from materials not native to Uganda, they could have traded for iron, steel etc. notice we have to start introducing other ideas and assumptions - this almost always make the answer incorrect- this is out of scope
B) The cylander is the most secure mechanism Neaderthals could have created: Who cares if it is the most secure the could have created? Who cares if the 12 pin is even the most secure? The argument is about this discovery provign the 12 pin has been around over 3k years - out of scope
C) No other lock cylander mechanism could have existed. Ok, so this is saying that this peice of a lock that was discovered could not have been part of some other type of design. This address our assumption. Looks good
D) Construction and intricacies known 9 AD (notice 2020-900 = 1,120 < 3,000 this is of no help at all - Irelevant
E) The material is malluable enough for 12 protrusions. Ok this is a mild strengthener. The material is such that they could have used the same material to eventually create a 12 pin cylinder, or maybe even the 8 pin piece is actually part of a 12 pin if the cylinder found at the site was whole.
C vs E. Notice we have to introduce a lot of assumptions/ lines of thought in order to accept E as a strengthener, but C address our unstated assumption without any neccessary assumptions / lines of thought. So C should be our correct answer.
