---
title: State the reason for which a pressure cooker is fitted with a safety… — Pressure tricks: pumps, tyres and vacu… · tree and pragmatics
description: State the reason for which a pressure cooker is fitted with a safety valve. Exam question 4 of lesson 16 «Pressure tricks: pumps, tyres and vacuums» 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 wrong.
---

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# Exam question 4 · Pressure tricks: pumps, tyres and vacuums

<!-- .ven lang=en -->
State the reason for which a pressure cooker is fitted with a safety valve.

<!-- .vintro -->
**Mova's choice:** option 1 · **The right answer:** option 2 · wrong ✗ · **What happens:** fit · **To what, where:** pressure cooker

<!-- .vabout -->
This is exam question 4 of lesson 16 «Pressure tricks: pumps, tyres and vacuums» 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/16-pressure-tricks-pumps-tyres-vacuums/#e4).

## The question {#question}

```conllu
# sent_id = question:physics:16-pressure-tricks-pumps-tyres-vacuums:e4:1
# text = State the reason for which a pressure cooker is fitted with a safety valve.
1	State	state	NOUN	NN	Number=Sing	0	root	_	_
2	the	the	DET	DT	Definite=Def|PronType=Art	3	det	_	_
3	reason	reason	NOUN	NN	Number=Sing	1	appos	_	_
4	for	for	ADP	IN	_	5	case	_	_
5	which	which	PRON	WDT	PronType=Rel	10	obl	_	_
6	a	a	DET	DT	Definite=Ind|PronType=Art	8	det	_	_
7	pressure	pressure	NOUN	NN	Number=Sing	8	compound	_	_
8	cooker	cooker	NOUN	NN	Number=Sing	10	nsubj:pass	_	_
9	is	be	AUX	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	10	aux:pass	_	_
10	fitted	fit	VERB	VBN	Tense=Past|VerbForm=Part|Voice=Pass	3	acl:relcl	_	_
11	with	with	ADP	IN	_	14	case	_	_
12	a	a	DET	DT	Definite=Ind|PronType=Art	14	det	_	_
13	safety	safety	NOUN	NN	Number=Sing	14	compound	_	_
14	valve	valve	NOUN	NN	Number=Sing	10	obl	_	SpaceAfter=No
15	.	.	PUNCT	.	_	1	punct	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **fit** | present · passive |  | a pressure cooker |  |  |  | for the reason; with a safety valve | vn adjust-26.9 «NP V NP»: subject=Patient |

<!-- .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 valve cools the steam to below boiling

```conllu
# sent_id = question:physics:16-pressure-tricks-pumps-tyres-vacuums:e4:o1:1
# text = The valve cools the steam to below boiling
1	The	the	DET	DT	Definite=Def|PronType=Art	2	det	_	_
2	valve	valve	NOUN	NN	Number=Sing	3	nsubj	_	_
3	cools	cool	VERB	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	0	root	_	_
4	the	the	DET	DT	Definite=Def|PronType=Art	5	det	_	_
5	steam	steam	NOUN	NN	Number=Sing	3	obj	_	_
6	to	to	PART	TO	_	7	mark	_	_
7	below	below	VERB	VB	VerbForm=Inf	3	advcl	_	_
8	boiling	boiling	NOUN	NN	Number=Sing	7	obj	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **cool** | present | the valve | the steam |  |  |  |  | vn other\_cos-45.4 «NP V NP.patient»: agent=Agent steam=Patient |
| 2 | **below** | to-infinitive | the valve *not said here* | boiling |  |  |  |  | tree rules |

### Option 2 · ✓ the right answer {#o2}

<!-- .ven lang=en -->
Excessive pressure of confined steam would constitute a hazard

```conllu
# sent_id = question:physics:16-pressure-tricks-pumps-tyres-vacuums:e4:o2:1
# text = Excessive pressure of confined steam would constitute a hazard
1	Excessive	excessive	ADJ	JJ	Degree=Pos	2	amod	_	_
2	pressure	pressure	NOUN	NN	Number=Sing	7	nsubj	_	_
3	of	of	ADP	IN	_	5	case	_	_
4	confined	confine	VERB	VBN	Tense=Past|VerbForm=Part|Voice=Pass	5	amod	_	_
5	steam	steam	NOUN	NN	Number=Sing	2	nmod	_	_
6	would	would	AUX	MD	VerbForm=Fin	7	aux	_	_
7	constitute	constitute	VERB	VB	VerbForm=Inf	0	root	_	_
8	a	a	DET	DT	Definite=Ind|PronType=Art	9	det	_	_
9	hazard	hazard	NOUN	NN	Number=Sing	7	obj	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **confine** | participle |  |  |  |  |  |  | vn confine-92-1 «NP V NP»: agent=Agent |
| 2 | **constitute** | would | Excessive pressure of confined steam | a hazard |  |  |  |  | vn comprise-107.2-1 «NP V NP»: agent=Theme hazard=Pivot |
| 3 | **press** |  |  | confined steam |  |  |  |  | nom pressure «phenomenon transitive»: of=patient |

### Option 3 {#o3}

<!-- .ven lang=en -->
The valve serves solely to release the odours of the food being cooked

```conllu
# sent_id = question:physics:16-pressure-tricks-pumps-tyres-vacuums:e4:o3:1
# text = The valve serves solely to release the odours of the food being cooked
1	The	the	DET	DT	Definite=Def|PronType=Art	2	det	_	_
2	valve	valve	NOUN	NN	Number=Sing	3	nsubj	_	_
3	serves	serve	VERB	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	0	root	_	_
4	solely	solely	ADV	RB	_	3	advmod	_	_
5	to	to	PART	TO	_	6	mark	_	_
6	release	release	VERB	VB	VerbForm=Inf	3	xcomp	_	_
7	the	the	DET	DT	Definite=Def|PronType=Art	8	det	_	_
8	odours	odour	NOUN	NNS	Number=Plur	6	obj	_	_
9	of	of	ADP	IN	_	11	case	_	_
10	the	the	DET	DT	Definite=Def|PronType=Art	11	det	_	_
11	food	food	NOUN	NN	Number=Sing	8	nmod	_	_
12	being	be	AUX	VBG	Tense=Pres|VerbForm=Part	13	aux:pass	_	_
13	cooked	cook	VERB	VBN	Tense=Past|VerbForm=Part|Voice=Pass	6	advcl	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **serve** | present | the valve |  |  |  |  | solely *property* | tree rules |
| 2 | **release** | to-infinitive | the valve *not said here* | the odours of the food |  |  |  |  | vn free-10.6.3-1 «NP V NP S\_ING»: agent=Causer odour=Source |
| 3 | **cook** | gerund · passive | the valve *not said here* |  |  |  |  |  | vn cooking-45.3 «NP.patient V» |

### Option 4 {#o4}

<!-- .ven lang=en -->
The valve permits the food to be observed

```conllu
# sent_id = question:physics:16-pressure-tricks-pumps-tyres-vacuums:e4:o4:1
# text = The valve permits the food to be observed
1	The	the	DET	DT	Definite=Def|PronType=Art	2	det	_	_
2	valve	valve	NOUN	NN	Number=Sing	3	nsubj	_	_
3	permits	permit	VERB	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	0	root	_	_
4	the	the	DET	DT	Definite=Def|PronType=Art	5	det	_	_
5	food	food	NOUN	NN	Number=Sing	3	obj	_	_
6	to	to	PART	TO	_	8	mark	_	_
7	be	be	AUX	VB	VerbForm=Inf	8	aux:pass	_	_
8	observed	observe	VERB	VBN	Tense=Past|VerbForm=Part|Voice=Pass	3	advcl	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **permit** | present | the valve | the food |  |  |  |  | vn admit-64.3-1 «NP V NP»: agent=Agent food=Theme |
| 2 | **observe** | to-infinitive · passive | the valve *not said here* |  |  |  |  |  | vn say-37.7-1-1 «NP V that S» |

<!-- 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 -->

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- ← previous: [Pressure tricks: pumps, tyres and vacu…, exam 3](https://md.mova.elamur.ai/free/en/corpora/questions/physics/16-pressure-tricks-pumps-tyres-vacuums/e3/)
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- ↑ back to [Pressure tricks: pumps, tyres and vacuums](https://md.mova.elamur.ai/free/en/corpora/questions/physics/16-pressure-tricks-pumps-tyres-vacuums/)