---
title: Which of the following statements most accurately characterises the… — Pressure tricks: pumps, tyres and vacu… · tree and pragmatics
description: Which of the following statements most accurately characterises the operation of a vacuum cleaner? Exam question 2 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
---

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# Exam question 2 · Pressure tricks: pumps, tyres and vacuums

<!-- .ven lang=en -->
Which of the following statements most accurately characterises the operation of a vacuum cleaner?

<!-- .vintro -->
**Mova's choice:** option 1 · **The right answer:** option 3 · wrong ✗ · **What happens:** follow, characteris, operate · **To what, where:** operation, vacuum cleaner

<!-- .vabout -->
This is exam question 2 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/#e2).

## The question {#question}

```conllu
# sent_id = question:physics:16-pressure-tricks-pumps-tyres-vacuums:e2:1
# text = Which of the following statements most accurately characterises the operation of a vacuum cleaner?
1	Which	which	PRON	WDT	PronType=Rel	8	nsubj	_	_
2	of	of	ADP	IN	_	5	case	_	_
3	the	the	DET	DT	Definite=Def|PronType=Art	5	det	_	_
4	following	follow	VERB	VBG	VerbForm=Ger	5	amod	_	_
5	statements	statement	NOUN	NNS	Number=Plur	8	obl	_	_
6	most	most	ADV	RBS	Degree=Sup	7	advmod	_	_
7	accurately	accurately	ADV	RB	_	8	advmod	_	_
8	characterises	characteris	VERB	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	0	root	_	_
9	the	the	DET	DT	Definite=Def|PronType=Art	10	det	_	_
10	operation	operation	NOUN	NN	Number=Sing	8	obj	_	_
11	of	of	ADP	IN	_	14	case	_	_
12	a	a	DET	DT	Definite=Ind|PronType=Art	14	det	_	_
13	vacuum	vacuum	NOUN	NN	Number=Sing	14	compound	_	_
14	cleaner	cleaner	NOUN	NN	Number=Sing	10	nmod	_	SpaceAfter=No
15	?	?	PUNCT	.	_	8	punct	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **follow** | gerund |  |  |  |  |  |  | vn occur-48.3-1 «NP V»: agent=Theme |
| 2 | **characteris** | present |  | the operation of a vacuum cleaner |  |  |  | of the following statements; accurately *property* | tree rules |
| 3 | **operate** |  |  | a vacuum cleaner |  |  |  |  | nom operation «state transitive»: of=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 dust is attracted by a magnetic field within the device

```conllu
# sent_id = question:physics:16-pressure-tricks-pumps-tyres-vacuums:e2:o1:1
# text = The dust is attracted by a magnetic field within the device
1	The	the	DET	DT	Definite=Def|PronType=Art	2	det	_	_
2	dust	dust	NOUN	NN	Number=Sing	4	nsubj:pass	_	_
3	is	be	AUX	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	4	aux:pass	_	_
4	attracted	attract	VERB	VBN	Tense=Past|VerbForm=Part|Voice=Pass	0	root	_	_
5	by	by	ADP	IN	_	8	case	_	_
6	a	a	DET	DT	Definite=Ind|PronType=Art	8	det	_	_
7	magnetic	magnetic	ADJ	JJ	Degree=Pos	8	amod	_	_
8	field	field	NOUN	NN	Number=Sing	4	obl	_	_
9	within	within	ADP	IN	_	11	case	_	_
10	the	the	DET	DT	Definite=Def|PronType=Art	11	det	_	_
11	device	device	NOUN	NN	Number=Sing	4	obl	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **attract** | present · passive | a magnetic field | the dust |  |  |  | within the device | vn lure-59.3 «NP V NP»: agent=Agent subject=Patient |

### Option 2 {#o2}

<!-- .ven lang=en -->
The nozzle adheres to the dust chemically

```conllu
# sent_id = question:physics:16-pressure-tricks-pumps-tyres-vacuums:e2:o2:1
# text = The nozzle adheres to the dust chemically
1	The	the	DET	DT	Definite=Def|PronType=Art	2	det	_	_
2	nozzle	nozzle	NOUN	NN	Number=Sing	3	nsubj	_	_
3	adheres	adhere	VERB	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	0	root	_	_
4	to	to	ADP	IN	_	6	case	_	_
5	the	the	DET	DT	Definite=Def|PronType=Art	6	det	_	_
6	dust	dust	NOUN	NN	Number=Sing	3	obl	_	_
7	chemically	chemically	ADV	RB	_	3	advmod	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **adhere** | present | the nozzle |  |  |  |  | to the dust; chemically *property* | vn cling-22.5 «NP V PP.co-theme»: agent=Theme to dust=Co-Theme |

### Option 3 · ✓ the right answer {#o3}

<!-- .ven lang=en -->
The external air, at higher pressure, propels the dust into a region of reduced pressure

<!-- fold The tree, 15 words -->
```conllu
# sent_id = question:physics:16-pressure-tricks-pumps-tyres-vacuums:e2:o3:1
# text = The external air, at higher pressure, propels the dust into a region of reduced pressure
1	The	the	DET	DT	Definite=Def|PronType=Art	3	det	_	_
2	external	external	ADJ	JJ	Degree=Pos	3	amod	_	_
3	air	air	NOUN	NN	Number=Sing	9	nsubj	_	SpaceAfter=No
4	,	,	PUNCT	,	_	7	punct	_	_
5	at	at	ADP	IN	_	7	case	_	_
6	higher	high	ADJ	JJR	Degree=Cmp	7	amod	_	_
7	pressure	pressure	NOUN	NN	Number=Sing	3	conj	_	SpaceAfter=No
8	,	,	PUNCT	,	_	3	punct	_	_
9	propels	propel	VERB	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	0	root	_	_
10	the	the	DET	DT	Definite=Def|PronType=Art	11	det	_	_
11	dust	dust	NOUN	NN	Number=Sing	9	obj	_	_
12	into	into	ADP	IN	_	14	case	_	_
13	a	a	DET	DT	Definite=Ind|PronType=Art	14	det	_	_
14	region	region	NOUN	NN	Number=Sing	9	obl	_	_
15	of	of	ADP	IN	_	17	case	_	_
16	reduced	reduce	VERB	VBN	Tense=Past|VerbForm=Part|Voice=Pass	17	amod	_	_
17	pressure	pressure	NOUN	NN	Number=Sing	14	nmod	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **propel** | present | the external air and higher pressure | the dust |  | a region of reduced pressure |  |  | tree rules |
| 2 | **reduce** | participle |  |  |  |  |  |  | vn limit-76 «NP V NP»: agent=Causer |

### Option 4 {#o4}

<!-- .ven lang=en -->
The dust is rendered lighter than the surrounding air

```conllu
# sent_id = question:physics:16-pressure-tricks-pumps-tyres-vacuums:e2:o4:1
# text = The dust is rendered lighter than the surrounding air
1	The	the	DET	DT	Definite=Def|PronType=Art	2	det	_	_
2	dust	dust	NOUN	NN	Number=Sing	4	nsubj:pass	_	_
3	is	be	AUX	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	4	aux:pass	_	_
4	rendered	render	VERB	VBN	Tense=Past|VerbForm=Part|Voice=Pass	0	root	_	_
5	lighter	light	ADJ	JJR	Degree=Cmp	4	xcomp	_	_
6	than	than	ADP	IN	_	9	case	_	_
7	the	the	DET	DT	Definite=Def|PronType=Art	9	det	_	_
8	surrounding	surround	VERB	VBG	VerbForm=Ger	9	amod	_	_
9	air	air	NOUN	NN	Number=Sing	5	obl	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **render** | present · passive |  | the dust |  |  |  | light *property* | vn give-13.1 «NP V NP»: subject=Theme |
| 2 | **surround** | gerund |  |  |  |  |  |  | vn contiguous\_location-47.8 «NP V NP»: agent=Theme |

<!-- 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 1](https://md.mova.elamur.ai/free/en/corpora/questions/physics/16-pressure-tricks-pumps-tyres-vacuums/e1/)
- next →: [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/)
- ↑ back to [Pressure tricks: pumps, tyres and vacuums](https://md.mova.elamur.ai/free/en/corpora/questions/physics/16-pressure-tricks-pumps-tyres-vacuums/)