What is quavers and qualms?

[Murena]

English Language Proficiency Tests, Advanced Level

ESL/EFL Test #88 "Verbal Advantage", question 7

As soon as he had invested the money, he became uneasy and was beginning to sense ......... about his investment.

(a) questions
(b) qualms
(c) queries
(d) quavers

English Language Proficiency Tests, Advanced Level

ESL/EFL Test #88 "Verbal Advantage", answer 7

As soon as he had invested the money, he became uneasy and was beginning to sense qualms about his investment.

Correct answer: (b) qualms
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what is quavers and qualms?

Murena

[Mister Micawber]

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Don't you have a DICTIONARY, Murena?
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Native English teacher at Mister Micawber's