---
title: Identify the principal mechanism by which a firecracker produces its… — Bangs and loud sounds: firecrackers an… · tree and pragmatics
description: Identify the principal mechanism by which a firecracker produces its report. Exam question 1 of lesson 19 «Bangs and loud sounds: firecrackers and ears» of the physics course of Mova's primary school, with the dependency tree and pragmatics of the question and of each option; Mova's choice was right
---

<!-- md -->
[Mova](https://md.mova.elamur.ai/free/en/) · [this page in HTML](https://mova.elamur.ai/free/en/corpora/questions/physics/19-bangs-and-loud-sounds-firecrackers-and-ears/e1/)

<!-- crumbs -->
[home](https://md.mova.elamur.ai/free/en/) / [corpora](https://md.mova.elamur.ai/free/en/corpora/) / [questions](https://md.mova.elamur.ai/free/en/corpora/questions/) / [Physics](https://md.mova.elamur.ai/free/en/corpora/questions/physics/) / [Bangs and loud sounds: firecrackers an…](https://md.mova.elamur.ai/free/en/corpora/questions/physics/19-bangs-and-loud-sounds-firecrackers-and-ears/) / e1

# Exam question 1 · Bangs and loud sounds: firecrackers and ears

<!-- .ven lang=en -->
Identify the principal mechanism by which a firecracker produces its report.

<!-- .vintro -->
**Mova's choice:** option 3 · **The right answer:** option 3 · right ✓ · **Who acts:** you, firecracker · **What happens:** identify, produce, report · **To what, where:** principal mechanism, report

<!-- .vabout -->
This is exam question 1 of lesson 19 «Bangs and loud sounds: firecrackers and ears» of the physics course of Mova's primary school, asked in stiff, formal language. The page gives the question's syntax tree — a dependency tree in the style of Universal Dependencies — and its pragmatics clause by clause, then the 4 options as the student saw them, each with its tree and pragmatics. Every text is parsed by Mova itself. How the student answered it, with the score of every option and why: [the test at school](https://md.mova.elamur.ai/free/en/school-run/physics/19-bangs-and-loud-sounds-firecrackers-and-ears/#e1).

## The question {#question}

```conllu
# sent_id = question:physics:19-bangs-and-loud-sounds-firecrackers-and-ears:e1:1
# text = Identify the principal mechanism by which a firecracker produces its report.
1	Identify	identify	VERB	VB	Mood=Imp|VerbForm=Fin	0	root	_	_
2	the	the	DET	DT	Definite=Def|PronType=Art	4	det	_	_
3	principal	principal	ADJ	JJ	Degree=Pos	4	amod	_	_
4	mechanism	mechanism	NOUN	NN	Number=Sing	1	obj	_	_
5	by	by	ADP	IN	_	6	case	_	_
6	which	which	PRON	WDT	PronType=Rel	9	obl	_	_
7	a	a	DET	DT	Definite=Ind|PronType=Art	8	det	_	_
8	firecracker	firecracker	NOUN	NN	Number=Sing	9	nsubj	_	_
9	produces	produce	VERB	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	4	acl:relcl	_	_
10	its	its	PRON	PRP$	Case=Gen|Gender=Neut|Number=Sing|Person=3|Poss=Yes|PronType=Prs	11	nmod:poss	_	_
11	report	report	NOUN	NN	Number=Sing	9	obj	_	SpaceAfter=No
12	.	.	PUNCT	.	_	1	punct	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **identify** | imperative | you *not said here* | the principal mechanism |  |  |  |  | vn characterize-29.2-1-1 «NP V NP S\_ING»: agent=Agent mechanism=Theme |
| 2 | **produce** | present | a firecracker | firecracker's report |  |  |  | by the principal mechanism | vn create-26.4 «NP V NP»: agent=Agent report=Result |
| 3 | **report** |  | firecracker |  |  |  |  |  | nom report «communication transitive»: poss=agent |

<!-- .note -->
One row per clause the reader finds. «not said here»: a role filled from the clause above. «roles by»: a VerbNet class and frame when one fits the verb, else the reader's rules on the tree.

## The options {#options}

### Option 1 {#o1}

<!-- .ven lang=en -->
The emission of intense light

```conllu
# sent_id = question:physics:19-bangs-and-loud-sounds-firecrackers-and-ears:e1:o1:1
# text = The emission of intense light
1	The	the	DET	DT	Definite=Def|PronType=Art	2	det	_	_
2	emission	emission	NOUN	NN	Number=Sing	0	root	_	_
3	of	of	ADP	IN	_	5	case	_	_
4	intense	intense	ADJ	JJ	Degree=Pos	5	amod	_	_
5	light	light	NOUN	NN	Number=Sing	2	nmod	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **emit** |  |  | intense light |  |  |  |  | nom emission «act transitive»: of=patient |

### Option 2 {#o2}

<!-- .ven lang=en -->
The rupture of the paper casing alone

```conllu
# sent_id = question:physics:19-bangs-and-loud-sounds-firecrackers-and-ears:e1:o2:1
# text = The rupture of the paper casing alone
1	The	the	DET	DT	Definite=Def|PronType=Art	2	det	_	_
2	rupture	rupture	NOUN	NN	Number=Sing	0	root	_	_
3	of	of	ADP	IN	_	5	case	_	_
4	the	the	DET	DT	Definite=Def|PronType=Art	5	det	_	_
5	paper	paper	NOUN	NN	Number=Sing	2	nmod	_	_
6	casing	case	VERB	VBG	VerbForm=Ger	2	acl	_	_
7	alone	alone	ADV	RB	_	6	advmod	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **case** | gerund | the rupture of the paper *not said here* |  |  |  |  | alone *property* | vn pocket-9.10 «NP V NP.theme»: agent=Agent |
| 2 | **rupture** |  |  | the paper |  |  |  |  | nom rupture «state transitive»: of=patient |

### Option 3 · ← Mova's choice · ✓ the right answer {#o3}

<!-- .ven lang=en -->
The rapid conversion of its charge into hot gas, which displaces the air in a single pressure wave

<!-- fold The tree, 18 words -->
```conllu
# sent_id = question:physics:19-bangs-and-loud-sounds-firecrackers-and-ears:e1:o3:1
# text = The rapid conversion of its charge into hot gas, which displaces the air in a single pressure wave
1	The	the	DET	DT	Definite=Def|PronType=Art	3	det	_	_
2	rapid	rapid	ADJ	JJ	Degree=Pos	3	amod	_	_
3	conversion	conversion	NOUN	NN	Number=Sing	12	nsubj	_	_
4	of	of	ADP	IN	_	6	case	_	_
5	its	its	PRON	PRP$	Case=Gen|Gender=Neut|Number=Sing|Person=3|Poss=Yes|PronType=Prs	6	nmod:poss	_	_
6	charge	charge	NOUN	NN	Number=Sing	3	nmod	_	_
7	into	into	ADP	IN	_	9	case	_	_
8	hot	hot	ADJ	JJ	Degree=Pos	9	amod	_	_
9	gas	gas	NOUN	NN	Number=Sing	3	nmod	_	SpaceAfter=No
10	,	,	PUNCT	,	_	12	punct	_	_
11	which	which	PRON	WDT	PronType=Rel	12	nsubj	_	_
12	displaces	displace	VERB	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	0	root	_	_
13	the	the	DET	DT	Definite=Def|PronType=Art	14	det	_	_
14	air	air	NOUN	NN	Number=Sing	12	obj	_	_
15	in	in	ADP	IN	_	19	case	_	_
16	a	a	DET	DT	Definite=Ind|PronType=Art	19	det	_	_
17	single	single	ADJ	JJ	Degree=Pos	19	amod	_	_
18	pressure	pressure	NOUN	NN	Number=Sing	19	compound	_	_
19	wave	wave	NOUN	NN	Number=Sing	12	obl	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **displace** | present | the rapid conversion of conversion's charge into hot gas | the air |  | a single pressure wave |  |  | tree rules |
| 2 | **convert** |  |  | conversion's charge |  | hot gas |  |  | nom conversion «event transitive»: of=patient into=place |
| 3 | **charge** |  | conversion |  |  |  |  |  | nom charge «act transitive»: poss=agent |

### Option 4 {#o4}

<!-- .ven lang=en -->
The vibration of a metallic component within the casing

```conllu
# sent_id = question:physics:19-bangs-and-loud-sounds-firecrackers-and-ears:e1:o4:1
# text = The vibration of a metallic component within the casing
1	The	the	DET	DT	Definite=Def|PronType=Art	2	det	_	_
2	vibration	vibration	NOUN	NN	Number=Sing	0	root	_	_
3	of	of	ADP	IN	_	6	case	_	_
4	a	a	DET	DT	Definite=Ind|PronType=Art	6	det	_	_
5	metallic	metallic	ADJ	JJ	Degree=Pos	6	amod	_	_
6	component	component	NOUN	NN	Number=Sing	2	nmod	_	_
7	within	within	ADP	IN	_	9	case	_	_
8	the	the	DET	DT	Definite=Def|PronType=Art	9	det	_	_
9	casing	casing	NOUN	NN	Number=Sing	6	nmod	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **vibrate** |  | a metallic component within the casing |  |  |  |  |  | nom vibration «act intransitive»: of=agent |

<!-- div src -->

**Text:** the tests of Mova's primary school, written for Mova (`world/data/school/`), as the course runner gave them to the student. **Trees:** Mova's own parse — the `en` model on the CPU, when the site is built — not checked by a teacher; they may be wrong. **Frames:** Mova's frames reader (`prag`), each text read on its own. Elamur Cosmic License.

<!-- /div -->

<!-- pn -->
- ← previous: [Bangs and loud sounds: firecrackers an…, test 11](https://md.mova.elamur.ai/free/en/corpora/questions/physics/19-bangs-and-loud-sounds-firecrackers-and-ears/t11/)
- next →: [Bangs and loud sounds: firecrackers an…, exam 2](https://md.mova.elamur.ai/free/en/corpora/questions/physics/19-bangs-and-loud-sounds-firecrackers-and-ears/e2/)
- ↑ back to [Bangs and loud sounds: firecrackers and ears](https://md.mova.elamur.ai/free/en/corpora/questions/physics/19-bangs-and-loud-sounds-firecrackers-and-ears/)