---
title: Fire: what it needs and how to put it out — how Mova does on the tests · Chemistry
description: Lesson 12 of the chemistry course of Mova's primary school: 4 of 10 tests right, exam 1 of 4, every question with the options, the student's choice, the right answer and why it chose.
---

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# Fire: what it needs and how to put it out

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**Tests:** 4 of 10 right · **Exam:** 1 of 4 right · **Kind:** ★★ · **Understood:** 8 of 14 · **Run:** 2026-10-18, commit `f3c23ea72`

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Lesson 12 of the chemistry 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/chemistry/12-fire-what-it-needs/).

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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/chemistry/12-fire-what-it-needs/).

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### Test 1 · ★★ · wrong ✗ {#t1}

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Your mate says: "Chip pan's on fire, chuck a bucket of water on it!" What should happen instead?

- **1.** Carry the pan outside — **← Mova's choice** · no support
- **2.** Throw the water quickly, because water always puts out every fire — no support
- **3.** Never water: cover it with a lid and get out — **✓ the right answer** · no support
- **4.** Blow on it hard — 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/chemistry/12-fire-what-it-needs/t1/)

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### Test 2 · ★★ · right ✓ {#t2}

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"why can't you put water on an electric fire, water puts everything out" Best answer?

- **1.** Water turns into oil near plugs — score 3
- **2.** Water carries electricity and could give a deadly shock — **← Mova's choice** · **✓ the right answer** · score 13
- **3.** Water makes electric fires much bigger and hotter — score 2
- **4.** Electric fires are too cold for water — score 4

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**Why:** It took the question to ask why something happens (its cause). It chose option 2 with score 13, against 4 for the next best. Its support: lesson 12, line 10: «Water must never be used on an electrical fire, because water carries electricity; carbon dioxide extinguishers push the oxygen away instead.», reached through the cause of the sentence the question matched. What matched: the same action «carry» (+6); the same thing acted on «electricity» (+4); the same doer «water» (+3). · [the question and its options parsed, with trees and pragmatics](https://md.mova.elamur.ai/free/en/corpora/questions/chemistry/12-fire-what-it-needs/t2/)

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### Test 3 · ★★ · right ✓ {#t3}

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Your friend tests the smoke alarm by holding a lighter under it. What should he do instead?

- **1.** Spray it with water from a bottle — score 2
- **2.** Blow smoke at it from a candle — no support
- **3.** Hit it hard with a broom handle — score 4
- **4.** Press the alarm's test button — **← Mova's choice** · **✓ the right answer** · score 6

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**Why:** It took the question to ask what is done. It chose option 4 with score 6, against 4 for the next best. Its support: lesson 12, line 11: «A smoke alarm senses tiny smoke particles; test it by pressing its button, never with a flame.», reached through a sentence linked to the one the question matched. What matched: it fills the role the question asks for (+3); the same action «press» (+2); the same thing acted on «button» (+2). Against it: 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/chemistry/12-fire-what-it-needs/t3/)

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### Test 4 · ★★ · wrong ✗ {#t4}

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In a cartoon, a boy runs back into a burning house to fetch his teddy. What is the right rule?

- **1.** Go back in quickly if it is a favourite toy and the stairs are clear — **← Mova's choice** · no support
- **2.** Get out, stay out; never go back in for toys or pets — **✓ the right answer** · no support
- **3.** Go back if the fire looks small — no support
- **4.** Go back if you hold your breath — 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/chemistry/12-fire-what-it-needs/t4/)

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### Test 5 · ★★ · wrong ✗ {#t5}

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Before opening a door in a fire drill, why do you feel it with the back of your hand?

- **1.** To check that it is not locked — **← Mova's choice** · no support
- **2.** To warm up your hand — no support
- **3.** To clean your hand — no support
- **4.** A hot door means fire behind it, so keep it shut — **✓ the right answer** · 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/chemistry/12-fire-what-it-needs/t5/)

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### Test 6 · ★★ · right ✓ {#t6}

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Your clothes caught fire in a story. What does the hero do?

- **1.** Stop, drop and roll — **← Mova's choice** · **✓ the right answer** · score 4
- **2.** Run as fast as possible — no support
- **3.** Wave his arms to blow it out — no support
- **4.** Jump up and down to shake it off — no support

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**Why:** It took the question to ask what is done. It chose option 1 with score 4, the only option with support. Its support: lesson 12, line 8: «A fire blanket smothers a small fire by cutting off oxygen; if your own clothes catch fire, the rule is "stop, drop and roll".», reached through the same lesson line as the sentence the question matched. What matched: it fills the role the question asks for (+3); the same action «drop» (+2). Against it: 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/chemistry/12-fire-what-it-needs/t6/)

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### Test 7 · ★★ · wrong ✗ {#t7}

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"who even dies of smoke, it's the flames that get ya" What is the truth?

- **1.** Most house-fire deaths are from smoke, often while asleep — **✓ the right answer** · no support
- **2.** Only flames can travel through houses — **← Mova's choice** · score 10
- **3.** Nobody has ever died from smoke — no support
- **4.** Smoke is harmless to breathe, and only the flames themselves can hurt you — score 10

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**Why:** It took the question to ask who or what does it. It chose option 2 with score 10, tied with another option at 10 (the first shown, or the one claiming less beyond what it knows, wins). Its support: lesson 4, line 17: «A flame is glowing hot gas; its yellow light comes from tiny specks of hot soot.», reached through the remembered sentence the question matched. What matched: it fills the role the question asks for (+6); the same doer «flame» (+4). 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/chemistry/12-fire-what-it-needs/t7/)

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### Test 8 · ★★ · wrong ✗ {#t8}

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What would happen if you took away the fuel from a campfire?

- **1.** It would get bigger — no support
- **2.** It would turn into smoke only — no support
- **3.** It would keep burning forever on the air alone — **← Mova's choice** · score 3
- **4.** It would go out when the fuel already burning is used up — **✓ the right answer** · no support

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**Why:** It took the question to ask what happens next. It chose option 3 with score 3, the only option with support. Its support: lesson 11, line 2: «Burning means a fuel joining with oxygen from the air and giving out heat and light; the wax becomes carbon dioxide and water vapour, which is why the candle g…», reached through the option's own match among the sentences about the question's things. What matched: the same place «air» (+3); the same doer «fuel» (+1). Against it: a different action (counts against) (-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/chemistry/12-fire-what-it-needs/t8/)

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### Test 9 · ★★ · right ✓ {#t9}

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Your brother says: "All fire is bad for forests." Is that the whole story?

- **1.** Yes, no plant at all can survive a forest fire — no support
- **2.** Fire only helps forests in winter — no support
- **3.** Forests cannot burn — no support
- **4.** Some trees and seeds need fire to open and grow — **← 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, the only option with support. Its support: lesson 12, line 18: «Some trees and seeds need fire to open their cones and grow.», reached through the option's own match among the sentences about the question's things. What matched: the same thing acted on «fire» (+2); its «because» matches the remembered cause (+2); the same action «need» (+1); the same doer «trees» (+1). · [the question and its options parsed, with trees and pragmatics](https://md.mova.elamur.ai/free/en/corpora/questions/chemistry/12-fire-what-it-needs/t9/)

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### Test 10 · ★★ · wrong ✗ {#t10}

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Why would a hedgehog choose a bonfire heap to sleep in?

- **1.** It wants to stay up and watch the fireworks — **← Mova's choice** · no support
- **2.** It is a warm, dry heap, good for winter sleep — **✓ the right answer** · no support
- **3.** It likes the smell of smoke — no support
- **4.** Hedgehogs love the heat from flames — 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/chemistry/12-fire-what-it-needs/t10/)

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### Exam question 1 · formal language · right ✓ {#e1}

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Which of the following statements most accurately characterises the requirements of combustion?

- **1.** Fuel, heat and oxygen must be present simultaneously — **← Mova's choice** · **✓ the right answer** · no support
- **2.** Heat and water must be present together — no support
- **3.** Fuel alone suffices in the absence of air, provided it be heated — no support
- **4.** Oxygen alone suffices in the absence of fuel — no support

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**Why:** Nothing it remembers matched the question, 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/chemistry/12-fire-what-it-needs/e1/)

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### Exam question 2 · formal language · wrong ✗ {#e2}

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Identify the principal reason for which water shall not be applied to burning cooking oil.

- **1.** It reacts chemically with the oil to form a poisonous and flammable liquid — **← Mova's choice** · score 4
- **2.** It cools the oil insufficiently to have any effect — score 3
- **3.** It increases the supply of fuel to the fire — score 1
- **4.** It is instantly converted to steam and projects the burning oil outward — **✓ the right answer** · score 4

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**Why:** It took the question to ask which statement is true. It chose option 1 with score 4, tied with another option at 4 (the first shown, or the one claiming less beyond what it knows, wins). Its support: lesson 7, line 14: «Honey, water and oil poured into one glass make three layers, with the densest, honey, at the bottom.», reached through the same lesson line as the sentence the question matched. What matched: the same circumstance (+3); the same doer «honey» (+2). Against it: a different action (counts against) (-1). The right option, 4, scored 4. · [the question and its options parsed, with trees and pragmatics](https://md.mova.elamur.ai/free/en/corpora/questions/chemistry/12-fire-what-it-needs/e2/)

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

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Select the response that is consistent with the established procedure in the event of a domestic fire.

- **1.** Retrieve personal belongings and pets from every room prior to evacuation, then summon assistance — **← Mova's choice** · no support
- **2.** Evacuate without delay, refrain from re-entering, and summon the emergency services — **✓ the right answer** · no support
- **3.** Remain within the dwelling until the fire is extinguished — no support
- **4.** Attempt to extinguish every fire personally — no support

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**Why:** Nothing it remembers matched the question, 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/chemistry/12-fire-what-it-needs/e3/)

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### Exam question 4 · formal language · wrong ✗ {#e4}

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It is given that a wildfire burns in dry, hot and windy weather. Identify the principal reason for which the wind aggravates it.

- **1.** The wind brings moisture to the vegetation — score 4
- **2.** The wind supplies fresh oxygen and carries heat to further vegetation — **✓ the right answer** · score 3
- **3.** The wind cools the flames and slows their progress — no support
- **4.** The wind removes the fuel from the path of the fire — **← Mova's choice** · score 5

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**Why:** It took the question to ask which statement is true. It chose option 4 with score 5, against 4 for the next best. Its support: lesson 12, line 17: «Wildfires spread fast in dry, hot, windy weather: dry plants are fuel, heat dries the next plants, and wind brings fresh oxygen; firefighters cut gaps to remov…», reached through the same lesson line as the sentence the question matched. What matched: the same action «remove» (+3); the same thing acted on «fuel» (+2). The right option, 2, scored 3. · [the question and its options parsed, with trees and pragmatics](https://md.mova.elamur.ai/free/en/corpora/questions/chemistry/12-fire-what-it-needs/e4/)

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- ← previous: [11. The candle and what burning is](https://md.mova.elamur.ai/free/en/school-run/chemistry/11-the-candle-and-burning/)
- next →: [13. Rust: iron's slow fire](https://md.mova.elamur.ai/free/en/school-run/chemistry/13-rust-irons-slow-fire/)
- ↑ back to [Chemistry](https://md.mova.elamur.ai/free/en/school-run/chemistry/)