Thinking it through: the science behind home safety

Tests: 5 of 19 right · Exam: 3 of 4 right · Kind: ★★★ · Understood: 12 of 23 · Run: 2026-10-18, commit f3c23ea72

Lesson 40 of the everyday 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.

Every question of this lesson and each of its options parsed by Mova, with trees and pragmatics: the lesson's questions in the corpora.

Test 1 · ★★★ · wrong ✗

A boy in Leeds sees chip-pan oil catch fire while his dad is cooking. Which plan works best?

1. Carry the pan to the sink and run the cold tap over the flames until they stop — no support
2. Blow on it hard to put the flames out — ← Mova's choice · score 5
3. Throw a glass of water on it at once — no support
4. Dad turns off the heat and covers it with a lid; if it grows, everyone gets out — ✓ the right answer · no support

Why: It took the question to ask who or what does it. It chose option 2 with score 5, the only option with support. Its support: lesson 34, line 16: «If your clothes catch fire, you stop, drop, cover your face and roll; rolling smothers the flames, putting them out by cutting off their air.», reached through the same lesson line as the sentence the question matched. What matched: the same action «put out» (+3); the same thing acted on «flames» (+2). The right option, 4, found no support in what it remembers. · the question and its options parsed, with trees and pragmatics

Test 2 · ★★★ · wrong ✗

A potato salad sits on a picnic table in Arizona for 3 hours at 100 °F (38 °C). Which is true?

1. It is safe because potato does not go bad — ← Mova's choice · no support
2. It is safe as long as it is put back in the fridge right now — no support
3. It is safe because it does not smell bad — no support
4. It is unsafe to eat, even if it looks and smells fine — ✓ the right answer · no support

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

Test 3 · ★★★ · wrong ✗

If bacteria double every 20 minutes, how many does 1 bacterium become after 2 hours?

1. 32 — ← Mova's choice · no support
2. 12 — no support
3. 64 — ✓ the right answer · no support
4. 6 — no support

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

Test 4 · ★★★ · wrong ✗

In a smoky hallway, why is a child crawling safer than an adult walking tall?

1. Fire only burns upward, never along the floor — ← Mova's choice · no support
2. The child is lighter, so the smoke floats past them and avoids them — no support
3. The child's face is in the cooler, cleaner air near the floor — ✓ the right answer · no support
4. Smoke cannot get into small lungs — no support

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

Test 5 · ★★★ · wrong ✗

What would happen if you put a lid on a candle jar?

1. The flame would keep burning for ever — ← Mova's choice · no support
2. The flame would grow bigger and hotter — no support
3. The flame would go out once its oxygen was used up — ✓ the right answer · no support
4. The flame would burn on quietly until all the wax ran out — no support

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

Test 6 · ★★★ · right ✓

A family has a gas boiler. Why would a smoke alarm alone not protect them from carbon monoxide?

1. Carbon monoxide always comes with thick smoke you can see coming — no support
2. Boilers cannot make any harmful gases — score 3
3. Smoke alarms only work in the kitchen — score -1
4. Carbon monoxide is not smoke and has no smell or colour — ← Mova's choice · ✓ the right answer · score 4

Why: It took the question to ask why something happens (its cause). It chose option 4 with score 4, against 3 for the next best. Its support: lesson 13, line 20: «Carbon monoxide has no smell or colour, and it can make people sleepy, sick and even kill them.», reached through the option's own match among the sentences about the question's things. What matched: the same thing acted on «smell» (+2); the same doer «carbon monoxide» (+1); the same light verb (be, have, do, get, go) (+1). · the question and its options parsed, with trees and pragmatics

Test 7 · ★★★ · wrong ✗

Which statement is true?

1. Water and oil mix together easily — ← Mova's choice · no support
2. Steam takes up less space than the water it was made from — no support
3. Oil sinks under water in a pan — no support
4. Steam takes up far more space than the water it came from — ✓ the right answer · no support

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

Test 8 · ★★★ · right ✓

A girl in Brisbane burns her arm on a hot oven tray. Her friend reaches for ice. What should she say?

1. Use nothing, burns always heal fastest dry — no support
2. Use the ice, because colder is always better for a burn — no support
3. Use cool running water, because ice can hurt the skin — ← Mova's choice · ✓ the right answer · score 6
4. Use butter, because it seals the burn from the air — no support

Why: It took the question to ask what it is done to. It chose option 3 with score 6, the only option with support. Its support: lesson 40, line 22: «Ice on a burn can damage the skin further, while cool running water cools it gently.», reached through the option's own match among the sentences about the question's things. What matched: it fills the role the question asks for (+3); the same doer «ice» (+2); the same thing acted on «skin» (+2). Against it: a different action (counts against) (-1). · the question and its options parsed, with trees and pragmatics

Test 9 · ★★★ · wrong ✗

Why does a fridge only slow food from going bad, and not stop it forever?

1. Cold slows bacteria but does not kill them — ✓ the right answer · no support
2. Bacteria grow faster in the dark of a fridge — score 2
3. Fridges warm up at night and cook the food — score 1
4. Food goes bad only because of its date label — ← Mova's choice · score 4

Why: It took the question to ask why something happens (its cause). It chose option 4 with score 4, against 2 for the next best. Its support: lesson 31, line 16: «Food that goes bad does not always smell or look bad, so smell is not a safe test.», reached through the option's own match among the sentences about the question's things. What matched: the same property (+2); the same doer «food» (+1); the same light verb (be, have, do, get, go) (+1). The right option, 1, found no support in what it remembers. · the question and its options parsed, with trees and pragmatics

Test 10 · ★★★ · right ✓

chip pan on fire, chuck water on it??

1. No, it can make a fireball — ← Mova's choice · ✓ the right answer · score 6
2. Yes, if the water is cold — score 4
3. Yes, water puts out all fires — score 4
4. Yes, a whole bucket — no support

Why: It took the question to ask which statement is true. It chose option 1 with score 6, against 4 for the next best. Its support: lesson 40, line 13: «Water thrown on a pan of burning oil can make a fireball of burning oil.», reached through the option's own match among the sentences about the question's things. What matched: the same action «make» (+4); the same thing acted on «fireball» (+2). · the question and its options parsed, with trees and pragmatics

Test 11 · ★★★ · wrong ✗

chicken left out in the sun all arvo, still ok?

1. Yes, if it looks fine — ← Mova's choice · no support
2. Yes, if it smells fine — no support
3. Yes, just cook it longer — no support
4. No, throw it out — ✓ the right answer · no support

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

Test 12 · ★★★ · right ✓

why does the co alarm matter, can't we smell it

1. No, carbon monoxide has no smell — ← Mova's choice · ✓ the right answer · no support
2. You can see it like fog — no support
3. Yes, it's a thick black smoke you'd spot — no support
4. Yes, it smells of eggs — no support

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

Test 13 · ★★★ · wrong ✗

burn, ice or tap

1. Butter — ← Mova's choice · no support
2. Ice straight on it — no support
3. Cool running water — ✓ the right answer · no support
4. A hot cloth — no support

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

Test 14 · ★★★ · right ✓

lil bro keeps climbing the bookcase, it wobbles

1. It is fine, he is light — no support
2. Put heavy books on top so it stops wobbling — no support
3. Tell an adult so it can be fixed to the wall — ← Mova's choice · ✓ the right answer · score 2
4. Let him, he will learn — no support

Why: It took the question to ask which statement is true. It chose option 3 with score 2, the only option with support. Its support: lesson 40, line 7: «A toddler in Brisbane climbed a chest of drawers that was not fixed to the wall; it tipped over on top of him, and he was hurt.», reached through the same lesson line as the sentence the question matched. What matched: the same action «fix» (+3); the same circumstance (+2). Against it: one says «not», the other does not (counts against) (-3). · the question and its options parsed, with trees and pragmatics

Test 15 · ★★★ · wrong ✗

why do we test the smoke alarm every month

1. A dead alarm cannot wake you in a fire — ✓ the right answer · score 7
2. So the fire brigade knows you — no support
3. To make the battery stronger every time — no support
4. So it beeps less at night — ← Mova's choice · score 8

Why: It took the question to ask which statement is true. It chose option 4 with score 8, against 7 for the next best. Its support: lesson 12, line 4: «Example: a smoke alarm beeping loudly at night means get out at once — not hide, not look for toys, not finish your game.», reached through the option's own match among the sentences about the question's things. What matched: the same action «beep» (+4); the same doer «smoke alarm» (+3); the same property (+1). The right option, 1, scored 7. · the question and its options parsed, with trees and pragmatics

Test 16 · ★★★ · wrong ✗

Mum says the hot tap's too hot for baby's bath, why tho

1. Babies like cold baths — ← Mova's choice · no support
2. The tap might break — no support
3. Hot water can scald a baby in seconds — ✓ the right answer · no support
4. Hot water makes them sleepy — no support

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

Test 17 · ★★★ · wrong ✗

my neighbour said someone threw water on a chip pan fire and a fireball took the kitchen ceiling off

1. It is gossip, so throwing water on a chip pan fire is fine — ← Mova's choice · score 6
2. Real lesson: never throw water on burning oil; an adult turns off the heat and covers the pan — ✓ the right answer · score 5
3. Real lesson: kitchens should never have ceilings — no support
4. It proves water always makes every kind of fire worse — no support

Why: It took the question to ask which statement is true. It chose option 1 with score 6, against 5 for the next best. Its support: lesson 40, line 13: «Water thrown on a pan of burning oil can make a fireball of burning oil.», reached through the option's own match among the sentences about the question's things. What matched: the same action «throw» (+4); the same thing acted on «water» (+2). The right option, 2, scored 5. · the question and its options parsed, with trees and pragmatics

Test 18 · ★★★ · wrong ✗

kid at school reckons cooking food kills every germ so u can leave the rice out for days

1. He is right, cooked food never goes bad, whatever you do with it — ← Mova's choice · score 4
2. He is right, rice is safe forever — no support
3. Wrong; some germs leave poisons that cooking does not destroy — ✓ the right answer · no support
4. He is right, if you reheat it twice — no support

Why: It took the question to ask which statement is true. It chose option 1 with score 4, the only option with support. Its support: lesson 31, line 16: «Food that goes bad does not always smell or look bad, so smell is not a safe test.», reached through the option's own match among the sentences about the question's things. What matched: the same doer «food» (+3); the same property (+1). The right option, 3, found no support in what it remembers. · the question and its options parsed, with trees and pragmatics

Test 19 · ★★★ · wrong ✗

the Kellys' kitchen caught fire and people say their mum was drunk, should i tell everyone

1. Yes, and add that the kids were left home on their own — ← Mova's choice · no support
2. Yes, so people stay away from them — no support
3. No, it is a cruel rumour you cannot know is true — ✓ the right answer · no support
4. Yes, because fires prove it — no support

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

Exam question 1 · formal language · right ✓

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

1. Fire requires heat, fuel and oxygen, the removal of any one of which extinguishes it — ← Mova's choice · ✓ the right answer · score 14
2. Fire requires oxygen alone and is able to burn without the presence of fuel — score 14
3. Fire requires heat alone and cannot be extinguished by any means whatsoever — score 14
4. Fire requires only fuel and water — score 14

Why: It took the question to ask who or what does it. It chose option 1 with score 14, tied with another option at 14 (the first shown, or the one claiming less beyond what it knows, wins). Its support: lesson 40, line 2: «A fire needs three things: heat, fuel and oxygen from the air. Take away any one and it goes out. A lid on a burning pan works because it cuts off the oxygen.», reached through the remembered sentence the question matched. What matched: the same action «need» (+4); the same thing acted on «three things» (+4); it fills the role the question asks for (+4); the same doer «fire» (+2). · the question and its options parsed, with trees and pragmatics

Exam question 2 · formal language · right ✓

Identify the principal reason for which water must not be thrown upon burning oil.

1. The water cools the oil too slowly to help — score 8
2. The water sinks beneath the oil and turns violently to steam, throwing out burning oil — ← Mova's choice · ✓ the right answer · score 10
3. The water causes the pan to melt immediately — score 8
4. The water mixes with the oil and makes it burn more slowly, so that the fire spreads further — score 8

Why: It took the question to ask which statement is true. It chose option 2 with score 10, against 8 for the next best. Its support: lesson 40, line 12: «When water turns to steam it takes up about 1,700 times more space.», reached through the option's own match among the sentences about the question's things. What matched: the same action «turn» (+4); the same doer «water» (+3); the same place «steam» (+3). · the question and its options parsed, with trees and pragmatics

Exam question 3 · formal language · wrong ✗

It being given that the air temperature exceeds ninety degrees Fahrenheit, determine the maximum period for which food may be left out.

1. Twelve hours — ← Mova's choice · no support
2. Two hours — no support
3. One hour — ✓ the right answer · no support
4. Four hours — no support

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

Exam question 4 · formal language · right ✓

Select the response that is consistent with the established facts concerning the growth of bacteria.

1. Bacteria grow only at temperatures below freezing and never in a warm kitchen — score 7
2. Under favourable conditions certain bacteria may double their number every twenty minutes — ← Mova's choice · ✓ the right answer · score 13
3. Bacteria cannot grow upon cooked food, since the heat of cooking protects it permanently — score 9
4. Bacteria double their number once a month — score 9

Why: It took the question to ask which statement is true. It chose option 2 with score 13, against 9 for the next best. Its support: lesson 40, line 18: «In good conditions some bacteria can double their number every 20 minutes.», reached through the option's own match among the sentences about the question's things. What matched: the same action «double» (+4); the same doer «bacteria» (+3); the same place «good conditions» (+3); the same thing acted on «number» (+2). · the question and its options parsed, with trees and pragmatics

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