---
title: Which is true about sound and light? — Thunder, sirens and how fast sound tra… · tree and pragmatics
description: Which is true about sound and light? Test 10 · ★ of lesson 18 «Thunder, sirens and how fast sound travels» 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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# Test 10 · ★ · Thunder, sirens and how fast sound travels

<!-- .ven lang=en -->
Which is true about sound and light?

<!-- .vintro -->
**Mova's choice:** option 1 · **The right answer:** option 2 · wrong ✗ · **What happens:** be

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This is test 10 · ★ of lesson 18 «Thunder, sirens and how fast sound travels» of the physics course of Mova's primary school. 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/18-thunder-sirens-and-how-fast-sound-travels/#t10).

## The question {#question}

```conllu
# sent_id = question:physics:18-thunder-sirens-and-how-fast-sound-travels:t10:1
# text = Which is true about sound and light?
1	Which	which	PRON	WDT	PronType=Rel	3	nsubj	_	_
2	is	be	AUX	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	3	cop	_	_
3	true	true	ADJ	JJ	Degree=Pos	0	root	_	_
4	about	about	ADP	IN	_	5	case	_	_
5	sound	sound	NOUN	NN	Number=Sing	3	obl	_	_
6	and	and	CCONJ	CC	_	7	cc	_	_
7	light	light	NOUN	NN	Number=Sing	5	conj	_	SpaceAfter=No
8	?	?	PUNCT	.	_	3	punct	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **is** | present |  |  |  |  |  | about sound and light; true *property* | tree rules |

<!-- .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 -->
They travel at exactly the same speed through the air

```conllu
# sent_id = question:physics:18-thunder-sirens-and-how-fast-sound-travels:t10:o1:1
# text = They travel at exactly the same speed through the air
1	They	they	PRON	PRP	Case=Nom|Number=Plur|Person=3|PronType=Prs	2	nsubj	_	_
2	travel	travel	VERB	VBP	Mood=Ind|Number=Plur|Person=3|Tense=Pres|VerbForm=Fin	0	root	_	_
3	at	at	ADP	IN	_	7	case	_	_
4	exactly	exactly	ADV	RB	_	7	advmod	_	_
5	the	the	DET	DT	Definite=Def|PronType=Art	7	det	_	_
6	same	same	ADJ	JJ	Degree=Pos	7	amod	_	_
7	speed	speed	NOUN	NN	Number=Sing	2	obl	_	_
8	through	through	ADP	IN	_	10	case	_	_
9	the	the	DET	DT	Definite=Def|PronType=Art	10	det	_	_
10	air	air	NOUN	NN	Number=Sing	2	obl	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **travel** | present | They |  |  | the same speed |  | through the air | vn run-51.3.2-1 «NP V PP.location»: agent=Theme at speed=Trajectory |

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

<!-- .ven lang=en -->
Light is about a million times faster than sound

```conllu
# sent_id = question:physics:18-thunder-sirens-and-how-fast-sound-travels:t10:o2:1
# text = Light is about a million times faster than sound
1	Light	light	NOUN	NN	Number=Sing	2	nsubj	_	_
2	is	be	VERB	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	0	root	_	_
3	about	about	ADV	RB	_	5	advmod	_	_
4	a	a	DET	DT	Definite=Ind|PronType=Art	5	det	_	_
5	million	million	NUM	CD	NumForm=Word|NumType=Card	6	nummod	_	_
6	times	time	NOUN	NNS	Number=Plur	7	obl:unmarked	_	_
7	faster	fast	ADV	RBR	Degree=Cmp	2	advmod	_	_
8	than	than	ADP	IN	_	9	case	_	_
9	sound	sound	NOUN	NN	Number=Sing	7	obl	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **be about** | present | Light |  |  |  |  | fast *property* | vn exist-47.1 «NP V»: agent=Theme |

### Option 3 {#o3}

<!-- .ven lang=en -->
Sound is a kind of light

```conllu
# sent_id = question:physics:18-thunder-sirens-and-how-fast-sound-travels:t10:o3:1
# text = Sound is a kind of light
1	Sound	sound	NOUN	NN	Number=Sing	4	nsubj	_	_
2	is	be	AUX	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	4	cop	_	_
3	a	a	DET	DT	Definite=Ind|PronType=Art	4	det	_	_
4	kind	kind	NOUN	NN	Number=Sing	0	root	_	_
5	of	of	ADP	IN	_	6	case	_	_
6	light	light	NOUN	NN	Number=Sing	4	nmod	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **is a** | present | Sound | a kind |  |  |  | of light | tree rules |

### Option 4 {#o4}

<!-- .ven lang=en -->
Sound is faster than light

```conllu
# sent_id = question:physics:18-thunder-sirens-and-how-fast-sound-travels:t10:o4:1
# text = Sound is faster than light
1	Sound	sound	NOUN	NN	Number=Sing	3	nsubj	_	_
2	is	be	AUX	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	3	cop	_	_
3	faster	fast	ADJ	JJR	Degree=Cmp	0	root	_	_
4	than	than	ADP	IN	_	5	case	_	_
5	light	light	NOUN	NN	Number=Sing	3	obl	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **is** | present | Sound |  |  |  |  | than light; fast *property* | tree rules |

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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: [Thunder, sirens and how fast sound tra…, test 9](https://md.mova.elamur.ai/free/en/corpora/questions/physics/18-thunder-sirens-and-how-fast-sound-travels/t9/)
- next →: [Thunder, sirens and how fast sound tra…, test 11](https://md.mova.elamur.ai/free/en/corpora/questions/physics/18-thunder-sirens-and-how-fast-sound-travels/t11/)
- ↑ back to [Thunder, sirens and how fast sound travels](https://md.mova.elamur.ai/free/en/corpora/questions/physics/18-thunder-sirens-and-how-fast-sound-travels/)