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
_________________________

what is quavers and qualms?

Murena

[Mister Micawber]

.
Don't you have a DICTIONARY, Murena?
.
_________________
Canadian-American native speaker
who teaches English for a living at Mister Micawber's
ESL cafe: Interview with Mr. Micawber