What are quirks?

[quirky]

English Language Proficiency Tests, Advanced Level

ESL/EFL Test #90 "High School Vocabulary", question 9

You'll soon get used to his funny ways as it's one of the ......... of his personality.

(a) quibbles
(b) quills
(c) quaffs
(d) quirks

English Language Proficiency Tests, Advanced Level

ESL/EFL Test #90 "High School Vocabulary", answer 9

You'll soon get used to his funny ways as it's one of the quirks of his personality.

Correct answer: (d) quirks

Your answer was: incorrect
You'll soon get used to his funny ways as it's one of the quills of his personality.
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is it the same as traits, quirks?

quirky

[Yankee]

In the context, quirk means an unusual or odd personality trait or behavior.

.....................

Hello Torsten
There was a question posted for this test:
http://www.english-test.net/esl/learn/english/grammar/ai092/esl-test.php
However, that test-taker's question has now been deleted, so my comment is in this thread instead.

In the test above, the target words in questions 7, 8 and 10 are generally written as one word rather than as two separate words. In other words, these words are normally written this way:
7. sandcastles
8. sandman
10. sandbags

In the test, however, they appear as separate words.
Just wanted to let you know.
.
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"Nearly all men can stand adversity, but if you want to test a man's character, give him power." ~ Abraham Lincoln