Keeping cold: fridges, freezers and heat pumps
Tests: 7 of 12 right · Exam: 3 of 4 right · Kind: ★★★ · Understood: 8 of 16 · Run: 2026-10-18, commit f3c23ea72
Lesson 10 of the technology 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 · ★★★ · right ✓
«hide and seek, gonna hide in the chest freezer, no one'll find me» What is right?
- 1. Fine, but only for a few minutes — no support
- 2. Fine, freezers always open easily from the inside if you push — no support
- 3. Fine, if you keep the lid open a crack — no support
- 4. Never climb into a freezer or fridge, you could get trapped — ← Mova's choice · ✓ the right answer · score 8
Why: It took the question to ask which statement is true. It chose option 4 with score 8, the only option with support. Its support: lesson 10, line 14: «Rules: never climb inside a fridge or freezer, because you could get trapped, and never put ice or metal straight from the freezer on your lips or tongue, beca…», reached through the remembered sentence the question matched. What matched: the same action «climb» (+4); the same place «fridge» (+4). · the question and its options parsed, with trees and pragmatics
Test 2 · ★★★ · wrong ✗
«lick the metal ice tray straight out the freezer, dare ya» What is the safe answer?
- 1. Only plastic trays can stick to tongues, metal ones never can — ← Mova's choice · no support
- 2. Don't: frozen metal can stick to your tongue and hurt — ✓ the right answer · no support
- 3. Licking warms the metal, so it is safe — no support
- 4. Do it, cold metal cannot stick to skin — 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 3 · ★★★ · wrong ✗
«boiling hot, leave the fridge open to cool the kitchen» What would really happen?
- 1. The fridge would fill the kitchen with snow — ← Mova's choice · score 6
- 2. The kitchen would get warmer, because the fridge dumps its heat out the back while working harder — ✓ the right answer · score 5
- 3. The kitchen would cool like an air conditioner — no support
- 4. Nothing would change at all — 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 10, line 12: «Each time the door is open, cold air spills out at the bottom, so the door should not be left open; an open fridge cannot cool the kitchen, because it works ha…», reached through the remembered sentence the question matched. What matched: the same doer «open fridge» (+4); the same thing acted on «kitchen» (+4). Against it: a different action (counts against) (-2). The right option, 2, scored 5. · the question and its options parsed, with trees and pragmatics
Test 4 · ★★★ · wrong ✗
«fridge is broke, the back's all warm!» What is the clever answer?
- 1. Yes, a warm back always means the motor is broken and needs fixing — ← Mova's choice · no support
- 2. A warm back is normal: that is where the heat from inside goes — ✓ the right answer · no support
- 3. The fridge is about to catch fire — no support
- 4. The food is cooking the fridge — 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 · ★★★ · right ✓
«how can u heat a house with freezing air, that's mental» What is right?
- 1. You can't, heat pumps only ever work in summer, when the air is already warm — no support
- 2. Even cold air holds some heat, and a heat pump collects it and pumps it in — ← Mova's choice · ✓ the right answer · score 10
- 3. Heat pumps melt ice to make fire — no support
- 4. Heat pumps burn the cold air for fuel — score 3
Why: It took the question to ask what something is like. It chose option 2 with score 10, against 3 for the next best. Its support: lesson 10, line 18: «A heat pump works like a fridge backwards: it collects heat from the outside air or the ground, even in winter, because even cold air holds some heat, and pump…», reached through the remembered sentence the question matched. What matched: the same action «hold» (+4); the same doer «cold air» (+4); the same thing acted on «heat» (+2). · the question and its options parsed, with trees and pragmatics
Test 6 · ★★★ · right ✓
What would happen to milk left on the kitchen table all day instead of in the fridge?
- 1. Germs would grow faster and it would go off sooner — ← Mova's choice · ✓ the right answer · score 4
- 2. It would stay fresh for even longer out in the open air — no support
- 3. Nothing at all, milk never goes off however warm it is — no support
- 4. It would slowly turn into safe yoghurt by the evening — score 2
Why: It took the question to ask which statement is true. It chose option 1 with score 4, against 2 for the next best. Its support: lesson 10, line 8: «A freezer works like a fridge but colder, around minus 18 degrees, so germs stop growing and food keeps for months.», reached through the same lesson line as the sentence the question matched. What matched: the same action «grow» (+2); the same doer «germs» (+2). · the question and its options parsed, with trees and pragmatics
Test 7 · ★★★ · wrong ✗
«stick a full glass bottle of juice in the freezer to chill it quick» What could go wrong?
- 1. The juice will turn into fizzy pop — no support
- 2. Nothing can ever go wrong — no support
- 3. The juice gets bigger as it freezes and can crack the bottle — ✓ the right answer · no support
- 4. The glass bottle will melt — ← Mova's choice · score 8
Why: It took the question to ask who or what does it. It chose option 4 with score 8, the only option with support. Its support: lesson 10, line 13: «Water gets bigger when it freezes, which is why a full glass bottle can crack in the freezer.», reached through the remembered sentence the question matched. What matched: it fills the role the question asks for (+6); the same doer «full glass bottle» (+4). Against it: a different action (counts against) (-2). The right option, 3, found no support in what it remembers. · the question and its options parsed, with trees and pragmatics
Test 8 · ★★★ · right ✓
«frozen food lasts for ever cos freezing kills germs» What is right?
- 1. Freezing stops germs growing, but they wake up when the food thaws — ← Mova's choice · ✓ the right answer · score 6
- 2. Yes, every germ dies in the freezer — score 3
- 3. Frozen food goes off within a day, so it must be eaten straight away — no support
- 4. Germs grow faster when frozen — score 4
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 10, line 9: «Freezing does not kill most germs; they wake up again when the food thaws.», reached through the remembered sentence the question matched. What matched: the same doer «freezing» (+4); the same thing acted on «most germs» (+4). Against it: a different action (counts against) (-2). · the question and its options parsed, with trees and pragmatics
Test 9 · ★★★ · right ✓
An ice tray has 2 rows of 8 cubes. You use 5. How many cubes are left?
- 1. 11 — ← Mova's choice · ✓ the right answer · no support
- 2. 3 — no support
- 3. 16 — no support
- 4. 13 — 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 10 · ★★★ · wrong ✗
Each cool box needs 4 ice packs. How many packs for 3 cool boxes?
- 1. 7 — ← Mova's choice · no support
- 2. 9 — no support
- 3. 12 — ✓ the right answer · no support
- 4. 16 — 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 11 · ★★★ · right ✓
«does the fridge light stay on all night with the door shut?» What is right?
- 1. No, a small switch turns it off when the door shuts — ← Mova's choice · ✓ the right answer · score 8
- 2. Yes, it stays on all the time, even when nobody opens it — no support
- 3. Only at weekends, when the family is home more often — no support
- 4. It stays on until all the food inside it has been eaten — score 6
Why: It took the question to ask which statement is true. It chose option 1 with score 8, against 6 for the next best. Its support: lesson 10, line 10: «A small switch turns on the fridge light when the door opens and off when it shuts, and a rubber seal with magnets inside keeps the cold in; a piece of paper s…», reached through the remembered sentence the question matched. What matched: the same action «shut» (+4); the same doer «door» (+4). · the question and its options parsed, with trees and pragmatics
Test 12 · ★★★ · right ✓
«shop fridge has no door, it'll lose all the cold, thick design» What is right?
- 1. A curtain of cold air keeps most cold in, though doors save even more electricity — ← Mova's choice · ✓ the right answer · no support
- 2. Open chillers lose no cold at all — no support
- 3. The chillers are packed with ice — no support
- 4. The cold leaks out only at night — 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 operation of a domestic refrigerator?
- 1. It transfers heat from its interior and releases it via pipes at the rear — ← Mova's choice · ✓ the right answer · no support
- 2. It manufactures cold within its motor and expels it into its interior via a fan — no support
- 3. It cools the food by causing the food itself to evaporate — no support
- 4. It admits cold air from outside the dwelling — 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 2 · formal language · right ✓
Identify the principal reason for which a full glass bottle of water may crack within a freezer.
- 1. Water expands upon freezing — ← Mova's choice · ✓ the right answer · no support
- 2. Ice is heavier than glass — no support
- 3. The freezer compresses all its contents — no support
- 4. Glass contracts to nothing at low temperatures — 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 3 · formal language · right ✓
Select the response consistent with the established facts concerning food stored in a freezer.
- 1. The food becomes permanently free of germs, even after it has been thawed — no support
- 2. Germs multiply more rapidly at low temperatures — no support
- 3. The growth of germs is arrested, though they may resume upon thawing — ← Mova's choice · ✓ the right answer · score 8
- 4. All germs are destroyed instantaneously — no support
Why: It took the question to ask which statement is true. It chose option 3 with score 8, the only option with support. Its support: lesson 10, line 4: «Cold matters because germs grow slowly below about 5 degrees and stop growing in a freezer at about minus 18, so milk and meat keep much longer.», reached through the remembered sentence the question matched. What matched: the same action «grow» (+4); the same doer «germs» (+4). · the question and its options parsed, with trees and pragmatics
Exam question 4 · formal language · wrong ✗
Ascertain the number of ice cubes remaining in a tray of three rows of six cubes, it being given that seven cubes have been removed.
- 1. Thirteen — ← Mova's choice · no support
- 2. Eighteen — no support
- 3. Ten — no support
- 4. Eleven — ✓ 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
This page in Markdown → https://md.mova.elamur.ai/free/en/school-run/technology/10-keeping-cold-fridges-freezers-and-heat-pumps/