---
title: "How do you know?" — how Mova does on the tests · World
description: Lesson 186 of the world course of Mova's primary school: 6 of 12 tests right, exam 2 of 4, every question with the options, the student's choice, the right answer and why it chose.
---

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# "How do you know?"

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**Tests:** 6 of 12 right · **Exam:** 2 of 4 right · **Kind:** plain · **Understood:** 8 of 16 · **Run:** 2026-10-18, commit `f3c23ea72`

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Lesson 186 of the world course of Mova's primary school, as Mova's small model took its tests: it had read this lesson and the ones before it and learned from their exercises. Each test shows the options in the order the student saw them, its choice, the right answer, the score of every option and why it chose. The lesson itself, sentence by sentence with trees and pragmatics: [the lesson in the corpora](https://md.mova.elamur.ai/free/en/corpora/school/world/186-how-do-you-know/).

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Every question of this lesson and each of its options parsed by Mova, with trees and pragmatics: [the lesson's questions in the corpora](https://md.mova.elamur.ai/free/en/corpora/questions/world/186-how-do-you-know/).

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### Test 1 · wrong ✗ {#t1}

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Ellie: "You 'just know'? Then where'd you hear it, my guy?" Is she aiming at Toby or at his claim?

- **1.** At nobody; she agrees with him — **← Mova's choice** · no support
- **2.** At his claim; she asks for the source — **✓ the right answer** · no support
- **3.** At sharks; she thinks they're silly — no support
- **4.** At Toby; she is saying he is stupid and young — no support

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**Why:** No option found support in what it remembers, so it guessed: it took the first option shown. · [the question and its options parsed, with trees and pragmatics](https://md.mova.elamur.ai/free/en/corpora/questions/world/186-how-do-you-know/t1/)

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### Test 2 · wrong ✗ {#t2}

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Mia: "Everyone says it, but did any astronaut say it? That's the question, innit." Why is her question better than "everyone says"?

- **1.** It asks which country built the Wall — **← Mova's choice** · no support
- **2.** It asks how many people keep repeating the claim — no support
- **3.** It asks for someone who actually looked — **✓ the right answer** · no support
- **4.** It asks whether the Wall is popular — no support

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**Why:** No option found support in what it remembers, so it guessed: it took the first option shown. · [the question and its options parsed, with trees and pragmatics](https://md.mova.elamur.ai/free/en/corpora/questions/world/186-how-do-you-know/t2/)

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### Test 3 · wrong ✗ {#t3}

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Josh's friend: "Bro, my nan's dog can sit and give a paw. Is she the second smartest dog in the world?" What is the friend showing?

- **1.** All dogs are exactly as smart — **← Mova's choice** · score 3
- **2.** Giving a paw is the real test — no support
- **3.** His nan's dog really is smarter, because she does two tricks — score 3
- **4.** Sitting is too common to prove "smartest" — **✓ the right answer** · no support

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**Why:** It took the question to ask what it is done to. It chose option 1 with score 3, tied with another option at 3 (the first shown, or the one claiming less beyond what it knows, wins). Its support: lesson 186, line 9: «One trick, like sitting, can't show that a dog is the smartest of millions of dogs.», reached through the option's own match among the sentences about the question's things. What matched: the same doer «dog» (+2); the same property (+1). The right option, 4, found no support in what it remembers. · [the question and its options parsed, with trees and pragmatics](https://md.mova.elamur.ai/free/en/corpora/questions/world/186-how-do-you-know/t3/)

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### Test 4 · wrong ✗ {#t4}

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Ruby: "Grandad, I looked it up. You got played by 1940." What tricked Grandad?

- **1.** A wartime story spread to hide radar — **✓ the right answer** · no support
- **2.** A real study of pilots who ate carrots — **← Mova's choice** · score 7
- **3.** A cartoon about a rabbit — no support
- **4.** Advice from a doctor today — no support

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**Why:** It took the question to ask who or what does it. It chose option 2 with score 7, the only option with support. Its support: lesson 174, line 5: «Family mockery aims at the blind trust, not the fan: "Your YouTuber builds great castles, but he's not a dietitian, love. Eat your carrots."», reached through the option's own match among the sentences about the question's things. What matched: the same thing acted on «carrots» (+4); the same action «eat» (+3). The right option, 1, found no support in what it remembers. · [the question and its options parsed, with trees and pragmatics](https://md.mova.elamur.ai/free/en/corpora/questions/world/186-how-do-you-know/t4/)

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### Test 5 · right ✓ {#t5}

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What would happen if a matador waved a green cape at a bull?

- **1.** It would run away from green — no support
- **2.** It would ignore anything that isn't red, like green — no support
- **3.** It would charge at the moving cape all the same — **← Mova's choice** · **✓ the right answer** · score 8
- **4.** It would sit down calmly — no support

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**Why:** It took the question to ask what happens next. It chose option 3 with score 8, the only option with support. Its support: lesson 186, line 11: «Bulls can't tell red from green well; they charge at the moving cape, not at its colour.», reached through what followed the sentence the question matched. What matched: the same action «charge» (+4); the same place «moving cape» (+4). · [the question and its options parsed, with trees and pragmatics](https://md.mova.elamur.ai/free/en/corpora/questions/world/186-how-do-you-know/t5/)

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### Test 6 · wrong ✗ {#t6}

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The teacher: "Sorry, Leo, no hidden superpowers." What would someone need to back up the 10% claim?

- **1.** A way to measure it, like brain scans, and they show the opposite — **✓ the right answer** · no support
- **2.** A famous film that says it — no support
- **3.** Nothing; everybody already knows it — no support
- **4.** A poster with a brain on it — **← Mova's choice** · score 7

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**Why:** It took the question to ask what it is done to. It chose option 4 with score 7, the only option with support. Its support: lesson 106, line 9: «Some coaches and teachers want you there before the start, so you can warm up or settle in; "on time" for them means early.», reached through the remembered sentence the question matched. What matched: the same action «want» (+4); the same doer «coaches» (+2); a different thing acted on (counts against) (+1). The right option, 1, found no support in what it remembers. · [the question and its options parsed, with trees and pragmatics](https://md.mova.elamur.ai/free/en/corpora/questions/world/186-how-do-you-know/t6/)

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### Test 7 · right ✓ {#t7}

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Priya: "Bouncy castle and 20 screaming friends, but it's the sugar? Sus, Uncle." What does Priya suspect?

- **1.** Sugar is what makes the castles bounce so high — no support
- **2.** Her uncle secretly ate all the sugar himself — score 5
- **3.** Another cause, the party, is being missed — **← Mova's choice** · **✓ the right answer** · score 7
- **4.** Her friends are made of sugar, like in the rhyme — score 1

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**Why:** It took the question to ask what it is done to. It chose option 3 with score 7, against 5 for the next best. Its support: lesson 186, line 13: «In careful studies where nobody knew which children had sugar, the sugar didn't change how they behaved; the excitement of a party is a likelier cause.», reached through the same lesson line as the sentence the question matched. What matched: it fills the role the question asks for (+4); the same thing acted on «likelier cause» (+3). · [the question and its options parsed, with trees and pragmatics](https://md.mova.elamur.ai/free/en/corpora/questions/world/186-how-do-you-know/t7/)

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### Test 8 · right ✓ {#t8}

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Max's sister: "I made a poster saying I'm queen of the house. Doesn't make me queen, Max." What is her point?

- **1.** Only queens can make posters — score 5
- **2.** Posters always tell the truth, because someone printed them — score 3
- **3.** Max is the king of the house — no support
- **4.** Anyone can make a poster; ask who and why — **← Mova's choice** · **✓ the right answer** · score 6

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**Why:** It took the question to ask which statement is true. It chose option 4 with score 6, against 5 for the next best. Its support: lesson 186, line 14: «Anyone can make a poster, so ask who made it and why; a poster from someone selling something might not tell the whole truth.», reached through a sentence linked to the one the question matched. What matched: the same action «ask» (+4); the same doer «anyone» (+2). · [the question and its options parsed, with trees and pragmatics](https://md.mova.elamur.ai/free/en/corpora/questions/world/186-how-do-you-know/t8/)

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### Test 9 · right ✓ {#t9}

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Harper's dad: "Did someone wait seven years and check? With a torch?" What is he really asking?

- **1.** Where the "seven years" number came from — **← Mova's choice** · **✓ the right answer** · no support
- **2.** Why chewing gum is so very sticky in your tummy — no support
- **3.** Who sells the best and brightest torches in town — no support
- **4.** How long a piece of gum takes to chew properly — no support

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**Why:** No option found support in what it remembers, so it guessed: it took the first option shown. · [the question and its options parsed, with trees and pragmatics](https://md.mova.elamur.ai/free/en/corpora/questions/world/186-how-do-you-know/t9/)

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### Test 10 · right ✓ {#t10}

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Kai: "If they buried their heads, they'd suffocate. There'd be no ostriches left. Think, bro." What is Kai doing?

- **1.** Attacking the person who said it — no support
- **2.** Saying everyone believes it — score 3
- **3.** Checking what would follow if the claim were true — **← Mova's choice** · **✓ the right answer** · score 8
- **4.** Quoting a famous person — no support

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**Why:** It took the question to ask what is done. It chose option 3 with score 8, against 3 for the next best. Its support: lesson 186, line 4: «Many famous "facts" are myths that nobody checked: carrots for night vision, the 10% brain, gum staying seven years, ostriches burying their heads.», reached through the same lesson line as the sentence the question matched. What matched: it fills the role the question asks for (+4); the same action «check» (+3); a different doer (counts against) (+1). · [the question and its options parsed, with trees and pragmatics](https://md.mova.elamur.ai/free/en/corpora/questions/world/186-how-do-you-know/t10/)

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### Test 11 · right ✓ {#t11}

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Nan in Liverpool: "Don't you get smart with me, missy, dry that hair or you'll catch your death." What is the truth?

- **1.** Colds come from viruses; drying your hair is just nicer — **← Mova's choice** · **✓ the right answer** · no support
- **2.** Wet hair always gives you a cold — no support
- **3.** Wet hair makes cold viruses grow — no support
- **4.** Nan is wrong, so never dry your hair — no support

<!-- .why -->
**Why:** No option found support in what it remembers, so it guessed: it took the first option shown. · [the question and its options parsed, with trees and pragmatics](https://md.mova.elamur.ai/free/en/corpora/questions/world/186-how-do-you-know/t11/)

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### Test 12 · wrong ✗ {#t12}

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Gen X dad: "Bummer, kid, your 'fact' needs a source. Totally rad that you checked, though." What is he praising?

- **1.** Repeating facts quickly — **← Mova's choice** · no support
- **2.** Believing whatever sounds cool — no support
- **3.** Checking where a claim came from — **✓ the right answer** · no support
- **4.** Never believing anything at all, just to be safe — no support

<!-- .why -->
**Why:** No option found support in what it remembers, so it guessed: it took the first option shown. · [the question and its options parsed, with trees and pragmatics](https://md.mova.elamur.ai/free/en/corpora/questions/world/186-how-do-you-know/t12/)

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### Exam question 1 · formal language · wrong ✗ {#e1}

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Identify the principal deficiency of the response "I just know" when offered in support of an assertion.

- **1.** It proves the assertion to be false — **← Mova's choice** · no support
- **2.** It provides no reason or source for the assertion — **✓ the right answer** · no support
- **3.** It is an instance of the fence-post error — no support
- **4.** It provides an excessive quantity of evidence for the assertion — no support

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**Why:** No option found support in what it remembers, so it guessed: it took the first option shown. · [the question and its options parsed, with trees and pragmatics](https://md.mova.elamur.ai/free/en/corpora/questions/world/186-how-do-you-know/e1/)

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### Exam question 2 · formal language · right ✓ {#e2}

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Select the response that is consistent with the established facts concerning the visibility of the Great Wall of China from space to the unaided eye.

- **1.** It is very difficult or impossible to discern — **← Mova's choice** · **✓ the right answer** · no support
- **2.** It is visible only at night — no support
- **3.** It is the sole structure visible from space — no support
- **4.** It is clearly visible from the surface of the Moon — no support

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**Why:** No option found support in what it remembers, so it guessed: it took the first option shown. · [the question and its options parsed, with trees and pragmatics](https://md.mova.elamur.ai/free/en/corpora/questions/world/186-how-do-you-know/e2/)

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### Exam question 3 · formal language · wrong ✗ {#e3}

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It is given that, during the Second World War, it was reported in Britain that carrots improved pilots' vision at night. Ascertain the principal purpose of this report.

- **1.** To increase the sale of carrots to the public during rationing — **← Mova's choice** · no support
- **2.** To discourage the consumption of carrots — no support
- **3.** To conceal the use of the newly developed radar — **✓ the right answer** · no support
- **4.** To report the results of a medical trial — no support

<!-- .why -->
**Why:** No option found support in what it remembers, so it guessed: it took the first option shown. · [the question and its options parsed, with trees and pragmatics](https://md.mova.elamur.ai/free/en/corpora/questions/world/186-how-do-you-know/e3/)

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### Exam question 4 · formal language · right ✓ {#e4}

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Which of the following statements most accurately characterises the cause of the common cold?

- **1.** It is caused by viruses transmitted from other persons — **← Mova's choice** · **✓ the right answer** · score 5
- **2.** It is caused by going outdoors with wet hair — no support
- **3.** It is caused by cold weather alone — no support
- **4.** It is caused by the consumption of ice cream — no support

<!-- .why -->
**Why:** It took the question to ask who or what does it. It chose option 1 with score 5, the only option with support. Its support: lesson 37, line 17: «Colds and flu are caused by viruses.», reached through the remembered sentence the question matched. What matched: it fills the role the question asks for (+3); the same action «cause» (+2); the same doer «viruses» (+1). Against it: a different thing acted on (counts against) (-1). · [the question and its options parsed, with trees and pragmatics](https://md.mova.elamur.ai/free/en/corpora/questions/world/186-how-do-you-know/e4/)

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<!-- pn -->
- ← previous: [185. Some, all, none and "not all"](https://md.mova.elamur.ai/free/en/school-run/world/185-some-all-none-and-not-all/)
- next →: [187. One counterexample is enough](https://md.mova.elamur.ai/free/en/school-run/world/187-one-counterexample-is-enough/)
- ↑ back to [World](https://md.mova.elamur.ai/free/en/school-run/world/)