---
title: Identify the principal reason for which mains electricity presents a… — Electricity dangers: sockets, water, c… · tree and pragmatics
description: Identify the principal reason for which mains electricity presents a danger to life whereas a torch battery does not. Exam question 1 of lesson 16 «Electricity dangers: sockets, water, chargers and batteries» of the technology course of Mova's primary school, with the dependency tree and pragmatics 
---

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# Exam question 1 · Electricity dangers: sockets, water, chargers and batteries

<!-- .ven lang=en -->
Identify the principal reason for which mains electricity presents a danger to life whereas a torch battery does not.

<!-- .vintro -->
**Mova's choice:** option 1 · **The right answer:** option 2 · wrong ✗ · **Who acts:** you, principal reason, danger · **What happens:** identify, main, present, not do · **To what, where:** electricity

<!-- .vabout -->
This is exam question 1 of lesson 16 «Electricity dangers: sockets, water, chargers and batteries» of the technology 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/technology/16-electricity-dangers/#e1).

## The question {#question}

```conllu
# sent_id = question:technology:16-electricity-dangers:e1:1
# text = Identify the principal reason for which mains electricity presents a danger to life whereas a torch battery does not.
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	reason	reason	NOUN	NN	Number=Sing	9	nsubj	_	_
5	for	for	ADP	IN	_	6	case	_	_
6	which	which	PRON	WDT	PronType=Rel	7	nsubj	_	_
7	mains	main	VERB	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	4	acl	_	_
8	electricity	electricity	NOUN	NN	Number=Sing	7	obj	_	_
9	presents	present	VERB	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	1	ccomp	_	_
10	a	a	DET	DT	Definite=Ind|PronType=Art	11	det	_	_
11	danger	danger	NOUN	NN	Number=Sing	18	nsubj	_	_
12	to	to	ADP	IN	_	13	case	_	_
13	life	life	NOUN	NN	Number=Sing	11	nmod	_	_
14	whereas	whereas	SCONJ	IN	_	17	case	_	_
15	a	a	DET	DT	Definite=Ind|PronType=Art	17	det	_	_
16	torch	torch	NOUN	NN	Number=Sing	17	compound	_	_
17	battery	battery	NOUN	NN	Number=Sing	11	nmod	_	_
18	does	do	VERB	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	9	conj	_	_
19	not	not	PART	RB	Polarity=Neg	18	advmod	_	SpaceAfter=No
20	.	.	PUNCT	.	_	1	punct	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **identify** | imperative | you *not said here* |  |  |  |  |  | vn characterize-29.2-1-1 «NP V S\_ING»: agent=Agent clause=Theme |
| 2 | **main** | present | the principal reason | electricity |  |  |  |  | tree rules |
| 3 | **present** | present | the principal reason |  |  |  |  |  | vn fulfilling-13.4.1 «NP V NP»: agent=Agent |
| 4 | **not** **do** | present | a danger to life whereas a torch battery |  |  |  |  |  | vn act-114-1 «NP V»: 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 human body conducts only battery electricity

```conllu
# sent_id = question:technology:16-electricity-dangers:e1:o1:1
# text = The human body conducts only battery electricity
1	The	the	DET	DT	Definite=Def|PronType=Art	3	det	_	_
2	human	human	ADJ	JJ	Degree=Pos	3	amod	_	_
3	body	body	NOUN	NN	Number=Sing	4	nsubj	_	_
4	conducts	conduct	VERB	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	0	root	_	_
5	only	only	ADV	RB	_	7	advmod	_	_
6	battery	battery	NOUN	NN	Number=Sing	7	compound	_	_
7	electricity	electricity	NOUN	NN	Number=Sing	4	obj	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **conduct** | present | the human body | battery electricity |  |  |  |  | vn accompany-51.7 «NP V NP»: agent=Agent electricity=Theme |

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

<!-- .ven lang=en -->
The mains voltage is greater by a very large factor

```conllu
# sent_id = question:technology:16-electricity-dangers:e1:o2:1
# text = The mains voltage is greater by a very large factor
1	The	the	DET	DT	Definite=Def|PronType=Art	3	det	_	_
2	mains	main	NOUN	NNS	Number=Plur	3	compound	_	_
3	voltage	voltage	NOUN	NN	Number=Sing	5	nsubj	_	_
4	is	be	AUX	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	5	cop	_	_
5	greater	great	ADJ	JJR	Degree=Cmp	0	root	_	_
6	by	by	ADP	IN	_	10	case	_	_
7	a	a	DET	DT	Definite=Ind|PronType=Art	10	det	_	_
8	very	very	ADV	RB	_	9	advmod	_	_
9	large	large	ADJ	JJ	Degree=Pos	10	amod	_	_
10	factor	factor	NOUN	NN	Number=Sing	5	obl	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **is** | present | the mains voltage |  |  |  |  | by a large factor; great *property* | tree rules |

### Option 3 {#o3}

<!-- .ven lang=en -->
The mains supply consists of alternating light

```conllu
# sent_id = question:technology:16-electricity-dangers:e1:o3:1
# text = The mains supply consists of alternating light
1	The	the	DET	DT	Definite=Def|PronType=Art	3	det	_	_
2	mains	main	NOUN	NNS	Number=Plur	3	compound	_	_
3	supply	supply	NOUN	NN	Number=Sing	4	nsubj	_	_
4	consists	consist	VERB	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	0	root	_	_
5	of	of	SCONJ	IN	_	6	mark	_	_
6	alternating	alternate	VERB	VBG	Tense=Pres|VerbForm=Part	4	advcl	_	_
7	light	light	NOUN	NN	Number=Sing	6	obj	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **consist** | present | the mains supply |  |  |  |  |  | tree rules |
| 2 | **alternate** | gerund | the mains supply *not said here* | light |  |  |  |  | vn amalgamate-22.2-2-1 «NP V NP»: agent=Agent light=Patient |

### Option 4 {#o4}

<!-- .ven lang=en -->
The battery contains no electrical energy

```conllu
# sent_id = question:technology:16-electricity-dangers:e1:o4:1
# text = The battery contains no electrical energy
1	The	the	DET	DT	Definite=Def|PronType=Art	2	det	_	_
2	battery	battery	NOUN	NN	Number=Sing	3	nsubj	_	_
3	contains	contain	VERB	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	0	root	_	_
4	no	no	DET	DT	PronType=Neg	6	det	_	_
5	electrical	electrical	ADJ	JJ	Degree=Pos	6	amod	_	_
6	energy	energy	NOUN	NN	Number=Sing	3	obj	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **contain** | present | the battery | no electrical energy |  |  |  |  | vn comprise-107.2-2 «NP V NP»: agent=Pivot energy=Theme |

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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.

<!-- /div -->

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