---
title: Ascertain the reason for which X-ray and gamma-ray telescopes are re… — Telescopes and light · tree and pragmatics
description: Ascertain the reason for which X-ray and gamma-ray telescopes are required to operate in space. Exam question 2 of lesson 27 «Telescopes and light» of the space 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 2 · Telescopes and light

<!-- .ven lang=en -->
Ascertain the reason for which X-ray and gamma-ray telescopes are required to operate in space.

<!-- .vintro -->
**Mova's choice:** option 1 · **The right answer:** option 3 · wrong ✗ · **Who acts:** you · **What happens:** ascertain, require, operate · **To what, where:** reason, X ray, space

<!-- .vabout -->
This is exam question 2 of lesson 27 «Telescopes and light» of the space 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/space/27-telescopes-and-light/#e2).

## The question {#question}

```conllu
# sent_id = question:space:27-telescopes-and-light:e2:1
# text = Ascertain the reason for which X-ray and gamma-ray telescopes are required to operate in space.
1	Ascertain	ascertain	VERB	VB	Mood=Imp|VerbForm=Fin	0	root	_	_
2	the	the	DET	DT	Definite=Def|PronType=Art	3	det	_	_
3	reason	reason	NOUN	NN	Number=Sing	1	obj	_	_
4	for	for	ADP	IN	_	5	case	_	_
5	which	which	PRON	WDT	PronType=Rel	15	obl	_	_
6	X	x	NOUN	NN	Number=Sing	8	compound	_	SpaceAfter=No
7	-	-	PUNCT	HYPH	_	6	punct	_	SpaceAfter=No
8	ray	ray	NOUN	NN	Number=Sing	15	nsubj:pass	_	_
9	and	and	CCONJ	CC	_	13	cc	_	_
10	gamma	gamma	NOUN	NN	Number=Sing	12	compound	_	SpaceAfter=No
11	-	-	PUNCT	HYPH	_	10	punct	_	SpaceAfter=No
12	ray	ray	NOUN	NN	Number=Sing	13	compound	_	_
13	telescopes	telescope	NOUN	NNS	Number=Plur	8	conj	_	_
14	are	be	AUX	VBP	Mood=Ind|Number=Plur|Person=3|Tense=Pres|VerbForm=Fin	15	aux:pass	_	_
15	required	require	VERB	VBN	Tense=Past|VerbForm=Part|Voice=Pass	3	parataxis	_	_
16	to	to	PART	TO	_	17	mark	_	_
17	operate	operate	VERB	VB	VerbForm=Inf	15	xcomp	_	_
18	in	in	ADP	IN	_	19	case	_	_
19	space	space	NOUN	NN	Number=Sing	17	obl	_	SpaceAfter=No
20	.	.	PUNCT	.	_	1	punct	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **ascertain** | imperative | you *not said here* | the reason |  |  |  |  | vn discover-84 «NP V NP»: agent=Agent reason=Topic |
| 2 | **require** | present · passive |  | X ray and ray telescopes |  |  |  | for the reason | vn order-58.3-1 «NP V NP S\_ING»: subject=Recipient clause=Topic |
| 3 | **operate** | to-infinitive |  |  |  | space |  |  | vn function-105.2.1-1 «NP V»: agent=Theme |

<!-- .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 -->
Such telescopes are too heavy for the ground

```conllu
# sent_id = question:space:27-telescopes-and-light:e2:o1:1
# text = Such telescopes are too heavy for the ground
1	Such	such	ADJ	JJ	Degree=Pos	2	amod	_	_
2	telescopes	telescope	NOUN	NNS	Number=Plur	5	nsubj	_	_
3	are	be	AUX	VBP	Mood=Ind|Number=Plur|Person=3|Tense=Pres|VerbForm=Fin	5	cop	_	_
4	too	too	ADV	RB	_	5	advmod	_	_
5	heavy	heavy	ADJ	JJ	Degree=Pos	0	root	_	_
6	for	for	ADP	IN	_	8	case	_	_
7	the	the	DET	DT	Definite=Def|PronType=Art	8	det	_	_
8	ground	ground	NOUN	NN	Number=Sing	5	obl	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **is** | present | Such telescopes |  |  |  |  | for the ground; heavy *property* | tree rules |

### Option 2 {#o2}

<!-- .ven lang=en -->
Such rays are produced only near the Moon

```conllu
# sent_id = question:space:27-telescopes-and-light:e2:o2:1
# text = Such rays are produced only near the Moon
1	Such	such	ADJ	JJ	Degree=Pos	2	amod	_	_
2	rays	ray	NOUN	NNS	Number=Plur	4	nsubj:pass	_	_
3	are	be	AUX	VBP	Mood=Ind|Number=Plur|Person=3|Tense=Pres|VerbForm=Fin	4	aux:pass	_	_
4	produced	produce	VERB	VBN	Tense=Past|VerbForm=Part|Voice=Pass	0	root	_	_
5	only	only	ADV	RB	_	8	advmod	_	_
6	near	near	ADP	IN	_	8	case	_	_
7	the	the	DET	DT	Definite=Def|PronType=Art	8	det	_	_
8	Moon	Moon	PROPN	NNP	Number=Sing	4	obl	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **produce** | present · passive |  | Such rays |  | the Moon |  |  | vn create-26.4 «NP V NP»: subject=Result |

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

<!-- .ven lang=en -->
The atmosphere of the Earth blocks such rays

```conllu
# sent_id = question:space:27-telescopes-and-light:e2:o3:1
# text = The atmosphere of the Earth blocks such rays
1	The	the	DET	DT	Definite=Def|PronType=Art	2	det	_	_
2	atmosphere	atmosphere	NOUN	NN	Number=Sing	0	root	_	_
3	of	of	ADP	IN	_	6	case	_	_
4	the	the	DET	DT	Definite=Def|PronType=Art	6	det	_	_
5	Earth	Earth	PROPN	NNP	Number=Sing	6	compound	_	_
6	blocks	block	NOUN	NNS	Number=Plur	2	nmod	_	_
7	such	such	ADJ	JJ	Degree=Pos	8	amod	_	_
8	rays	ray	NOUN	NNS	Number=Plur	6	conj	_	_
```

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

### Option 4 {#o4}

<!-- .ven lang=en -->
Such rays are too faint at night

```conllu
# sent_id = question:space:27-telescopes-and-light:e2:o4:1
# text = Such rays are too faint at night
1	Such	such	ADJ	JJ	Degree=Pos	2	amod	_	_
2	rays	ray	NOUN	NNS	Number=Plur	5	nsubj	_	_
3	are	be	AUX	VBP	Mood=Ind|Number=Plur|Person=3|Tense=Pres|VerbForm=Fin	5	cop	_	_
4	too	too	ADV	RB	_	5	advmod	_	_
5	faint	faint	ADJ	JJ	Degree=Pos	0	root	_	_
6	at	at	ADP	IN	_	7	case	_	_
7	night	night	NOUN	NN	Number=Sing	5	obl	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **is** | present | Such rays |  |  |  | night | faint *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.

<!-- /div -->

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- ← previous: [Telescopes and light, exam 1](https://md.mova.elamur.ai/free/en/corpora/questions/space/27-telescopes-and-light/e1/)
- next →: [Telescopes and light, exam 3](https://md.mova.elamur.ai/free/en/corpora/questions/space/27-telescopes-and-light/e3/)
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