Week 9 — Quiz (auto-graded) · Triads

Course: MUS 156 Music Theory I · Kenosis College
Instructor: Professor Hemsworth
Unit: Learning Unit 9 of 16 (Week 9) · two sessions per week
Objectives tested: SLO 4 (spell and identify triads in every quality and inversion) · SLO 7 (name what you hear — here, name what you've sung)
Points: 10 (10 × 1) · Group: Quizzes (lowest 2 of 14 dropped) · Due: the end of Week 9 · online, 15-minute timer, 1 attempt, closed to AI.

This is the human-readable quiz with its vetted answer key and feedback. The import-ready QTI is rendered by the build system from _build/banks/lu-09.json, which also holds this unit's 15 exam-pool items (idents k3lu09x01–x15) — those test the same concepts with different stems, feed the final, and never appear on this quiz. Every item below is answerable from text alone; no images required.

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Blueprint

The table below maps each item to its type, concept, and objective.

#	Type	Concept(s)	Objective
1	Multiple choice	The triad as stacked thirds	SLO 4
2	Multiple choice	Quality identification (minor)	SLO 4
3	Multiple choice	Augmented triad spelling	SLO 4
4	Multiple choice	Triad chord symbols	SLO 4
5	Matching	The four quality recipes	SLO 4
6	Multiple choice	Diatonic triads in major (V)	SLO 4
7	True / False	Inversion ≠ different chord	SLO 4
8	Multiple choice	The figure 6/4	SLO 4
9	Multiple choice	Diatonic quality on ^7	SLO 4
10	Multiple choice	Do–mi–sol named (the tonic triad)	SLO 7

No trick questions; every distractor targets a misconception named in the Week 9 outline (any-three-notes, quality-as-mood-only shortcuts, inversion-as-different-chord, figures-as-fractions, diminished-as-any-dissonance, enharmonic letter slips).

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Questions, key, and feedback

Q1 (MC). Root, third, fifth: neighboring notes inside a triad sit apart from each other by —

• A. a second
• B. a third ✅
• C. a fourth
• D. a fifth

Feedback: Triads pile third upon third — line, skip a line, skip again.

Q2 (MC). The keys player lays down A–C–E. Its quality is —

• A. minor ✅
• B. major
• C. diminished
• D. augmented

Feedback: A up to C is a minor third sitting under a perfect fifth: the minor recipe exactly.

Q3 (MC). Pick the correct spelling of the augmented triad built on G.

• A. G–B–D
• B. G–B♭–D♭
• C. G–B–D♯ ✅
• D. G–B♭–D♯

Feedback: Augmented keeps the major third B and pushes the fifth up to D♯.

Q4 (MC). A lead sheet calls Em. Which notes answer?

• A. E–G♯–B
• B. E–G–B ✅
• C. E–G–B♭
• D. E–G♯–B♯

Feedback: The little m lowers only the third: E, G natural, B natural.

Q5 (Matching). Each interval pair below constructs one triad quality. Match them.

Answer bank: major · minor · diminished · augmented

• M3 + P5 → major ✅
• m3 + P5 → minor ✅
• m3 + d5 → diminished ✅
• M3 + A5 → augmented ✅

Feedback: Major pairs M3 with P5; minor swaps in m3; diminished shrinks the fifth; augmented stretches it.

Q6 (MC). Using only E♭ major's own notes, the triad that rises from scale degree 4 is —

• A. A♭–C♭–E♭, minor
• B. B♭–D–F, major
• C. A♭–C–E, augmented
• D. A♭–C–E♭, major ✅

Feedback: Degree 4 of E♭ major is A♭; the key supplies C and E♭ above it, a major triad.

Q7 (True/False). Voiced as A–C–F with A at the bottom, these three notes form some chord other than F major.

• True
• False ✅

Feedback: Re-stack in thirds and F–A–C reappears; a new bass note changes the inversion, never the identity.

Q8 (MC). A 6/4 written under the staff tells the reader —

• A. the chord's fifth holds the bass — second inversion ✅
• B. the chord's third holds the bass — first inversion
• C. the meter has switched to six quarter-note beats
• D. six chord tones must fit inside four beats

Feedback: Figures describe the bass: 6/4 means the fifth is downstairs, with the root a fourth above it.

Q9 (MC). Take any of the fifteen major keys: the triad the key builds on its seventh degree always turns out —

• A. diminished ✅
• B. major
• C. augmented
• D. minor

Feedback: On ^7 the key stacks m3 plus d5, so the leading-tone triad is diminished everywhere.

Q10 (MC). Sing do, then mi, then sol, in any major key. What have you just outlined?

• A. a stretch of scale with no chord meaning
• B. the major tonic triad — degrees 1, 3, and 5 ✅
• C. a minor triad standing in first inversion
• D. a diminished triad standing in root position

Feedback: Do-mi-sol is ^1-^3-^5: the home chord, major, hiding in a warm-up you already own.

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Answer key (quick reference)

The table below lists each item's correct response.

Q	Answer
1	B
2	A
3	C
4	B
5	M3 + P5 → major · m3 + P5 → minor · m3 + d5 → diminished · M3 + A5 → augmented
6	D
7	False
8	A
9	A
10	B

Quality gate (machine-checked): exactly one correct option per single-answer item; the multiple-choice key sequence B A C B D A A B carries no run longer than two and no positional lean; option lengths balanced within each item; every spelling claim verified against the course theory reference by the correctness gate; no item tests material from a later unit; no stem or scenario reuses the tutorial, practice, chapter, studio, assignment, or exam-pool surfaces (leakage-checked mechanically at build time).

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Item-bank note (instructor-facing)

The ten quiz items above carry idents k3lu09q01–k3lu09q10 in _build/banks/lu-09.json, each tagged with its ledger concept_ids and objective. The same bank holds k3lu09x01–k3lu09x15: fifteen exam-pool items on the same thirteen Week 9 concepts with fully different stems (zero text overlap — the leakage gate checks). The final draws from the pool, never from the live quiz.

Canvas placement block

canvas_object    = Quizzes::Quiz
title            = "Week 9 Quiz — Triads"
assignment_group = "Quizzes"
points_possible  = 10
grading_type     = points
time_limit       = 15
allowed_attempts = 1
shuffle_answers  = true
due              = the end of Week 9
published        = true
access_note      = "Closed to AI — this one is just you and the recipes. The proctored final works the same way."

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