---
title: Identify the principal origin of the diverse colours observed in pyr… — Colours of fire: fireworks · tree and pragmatics
description: Identify the principal origin of the diverse colours observed in pyrotechnic displays. Exam question 1 of lesson 26 «Colours of fire: fireworks» of the chemistry course of Mova's primary school, with the dependency tree and pragmatics of the question and of each option; Mova's choice was wrong.
---

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# Exam question 1 · Colours of fire: fireworks

<!-- .ven lang=en -->
Identify the principal origin of the diverse colours observed in pyrotechnic displays.

<!-- .vintro -->
**Mova's choice:** option 1 · **The right answer:** option 4 · wrong ✗ · **Who acts:** you · **What happens:** identify, observe · **To what, where:** principal origin, diverse colours, pyrotechnic displays

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This is exam question 1 of lesson 26 «Colours of fire: fireworks» of the chemistry 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/chemistry/26-colours-of-fire-fireworks/#e1).

## The question {#question}

```conllu
# sent_id = question:chemistry:26-colours-of-fire-fireworks:e1:1
# text = Identify the principal origin of the diverse colours observed in pyrotechnic displays.
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	origin	origin	NOUN	NN	Number=Sing	1	obj	_	_
5	of	of	ADP	IN	_	8	case	_	_
6	the	the	DET	DT	Definite=Def|PronType=Art	8	det	_	_
7	diverse	diverse	ADJ	JJ	Degree=Pos	8	amod	_	_
8	colours	colour	NOUN	NNS	Number=Plur	4	nmod	_	_
9	observed	observe	VERB	VBN	Tense=Past|VerbForm=Part|Voice=Pass	8	acl	_	_
10	in	in	ADP	IN	_	12	case	_	_
11	pyrotechnic	pyrotechnic	NOUN	NN	Number=Sing	12	compound	_	_
12	displays	display	NOUN	NNS	Number=Plur	9	obl	_	SpaceAfter=No
13	.	.	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 origin of the diverse colours |  |  |  |  | vn characterize-29.2-1-1 «NP V NP S\_ING»: agent=Agent origin=Theme |
| 2 | **observe** | participle |  | the diverse colours *not said here* |  | pyrotechnic displays |  |  | vn say-37.7-1-1 «NP V that S»: agent=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 · ← Mova's choice {#o1}

<!-- .ven lang=en -->
The coloured paper enclosing the device

```conllu
# sent_id = question:chemistry:26-colours-of-fire-fireworks:e1:o1:1
# text = The coloured paper enclosing the device
1	The	the	DET	DT	Definite=Def|PronType=Art	3	det	_	_
2	coloured	coloured	ADJ	JJ	Degree=Pos	3	amod	_	_
3	paper	paper	NOUN	NN	Number=Sing	0	root	_	_
4	enclosing	enclose	VERB	VBG	VerbForm=Ger	3	acl	_	_
5	the	the	DET	DT	Definite=Def|PronType=Art	6	det	_	_
6	device	device	NOUN	NN	Number=Sing	4	obj	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **enclose** | gerund | the coloured paper *not said here* | the device |  |  |  |  | vn contiguous\_location-47.8 «NP V NP»: agent=Theme device=Co-Theme |

### Option 2 {#o2}

<!-- .ven lang=en -->
The colour of the smoke produced on ignition

```conllu
# sent_id = question:chemistry:26-colours-of-fire-fireworks:e1:o2:1
# text = The colour of the smoke produced on ignition
1	The	the	DET	DT	Definite=Def|PronType=Art	2	det	_	_
2	colour	colour	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	smoke	smoke	NOUN	NN	Number=Sing	2	nmod	_	_
6	produced	produce	VERB	VBN	Tense=Past|VerbForm=Part|Voice=Pass	2	acl	_	_
7	on	on	ADP	IN	_	8	case	_	_
8	ignition	ignition	NOUN	NN	Number=Sing	6	obl	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **produce** | participle |  | the colour of the smoke *not said here* |  | ignition |  |  | vn create-26.4 «NP V NP»: agent=Agent |

### Option 3 {#o3}

<!-- .ven lang=en -->
The reflection of artificial light by clouds

```conllu
# sent_id = question:chemistry:26-colours-of-fire-fireworks:e1:o3:1
# text = The reflection of artificial light by clouds
1	The	the	DET	DT	Definite=Def|PronType=Art	2	det	_	_
2	reflection	reflection	NOUN	NN	Number=Sing	0	root	_	_
3	of	of	ADP	IN	_	5	case	_	_
4	artificial	artificial	ADJ	JJ	Degree=Pos	5	amod	_	_
5	light	light	NOUN	NN	Number=Sing	2	nmod	_	_
6	by	by	ADP	IN	_	7	case	_	_
7	clouds	cloud	NOUN	NNS	Number=Plur	2	nmod	_	_
```

<!-- .note -->
The frames reader finds no event or fact in this sentence.

### Option 4 · ✓ the right answer {#o4}

<!-- .ven lang=en -->
The presence of different metals within the device

```conllu
# sent_id = question:chemistry:26-colours-of-fire-fireworks:e1:o4:1
# text = The presence of different metals within the device
1	The	the	DET	DT	Definite=Def|PronType=Art	2	det	_	_
2	presence	presence	NOUN	NN	Number=Sing	0	root	_	_
3	of	of	ADP	IN	_	5	case	_	_
4	different	different	ADJ	JJ	Degree=Pos	5	amod	_	_
5	metals	metal	NOUN	NNS	Number=Plur	2	nmod	_	_
6	within	within	ADP	IN	_	8	case	_	_
7	the	the	DET	DT	Definite=Def|PronType=Art	8	det	_	_
8	device	device	NOUN	NN	Number=Sing	2	nmod	_	_
```

<!-- .note -->
The frames reader finds no event or fact in this sentence.

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**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.

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- ← previous: [Colours of fire: fireworks, test 11](https://md.mova.elamur.ai/free/en/corpora/questions/chemistry/26-colours-of-fire-fireworks/t11/)
- next →: [Colours of fire: fireworks, exam 2](https://md.mova.elamur.ai/free/en/corpora/questions/chemistry/26-colours-of-fire-fireworks/e2/)
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