---
title: Olympiad: machines at home and in the factory ★★★ — how Mova does on the tests · Technology
description: Lesson 42 of the technology course of Mova's primary school: 4 of 11 tests right, exam 3 of 4, every question with the options, the student's choice, the right answer and why it chose.
---

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# Olympiad: machines at home and in the factory ★★★

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**Tests:** 4 of 11 right · **Exam:** 3 of 4 right · **Kind:** ★★★ · **Understood:** 8 of 15 · **Run:** 2026-10-18, commit `f3c23ea72`

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Lesson 42 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](https://md.mova.elamur.ai/free/en/corpora/school/technology/42-olympiad-machines-at-home-and-in-the-factory/).

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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/technology/42-olympiad-machines-at-home-and-in-the-factory/).

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### Test 1 · ★★★ · right ✓ {#t1}

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★★★ «bruv my bike's in the biggest back cog, gonna be well fast on the flat innit» What is right?

- **1.** It makes no difference which cog the chain is on — no support
- **2.** No, the biggest back cog is easiest but slowest, good for hills — **← Mova's choice** · **✓ the right answer** · score 3
- **3.** Yes, the biggest cog always gives the top speed on the flat — no support
- **4.** Yes, but only while you pedal backwards — no support

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**Why:** It took the question to ask which statement is true. It chose option 2 with score 3, the only option with support. Its support: lesson 42, line 7: «A bigger back cog makes pedalling easier but slower, good for hills; a smaller back cog makes it harder but faster.», reached through the option's own match among the sentences about the question's things. What matched: the same doer «bigger back cog» (+2); the same property (+1). · [the question and its options parsed, with trees and pragmatics](https://md.mova.elamur.ai/free/en/corpora/questions/technology/42-olympiad-machines-at-home-and-in-the-factory/t1/)

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### Test 2 · ★★★ · wrong ✗ {#t2}

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★★★ «it's roasting, leave the fridge door open, it'll cool the kitchen» Will it?

- **1.** No, because fridges switch off when the door is open — **← Mova's choice** · score 4
- **2.** Yes, a fridge makes cold air, so an open one will cool any room it stands in — score 3
- **3.** Yes, but only if you open the freezer door as well — score 2
- **4.** No, the heat it takes in comes out of its back into the same kitchen — **✓ the right answer** · no support

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**Why:** It took the question to ask which statement is true. It chose option 1 with score 4, against 3 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 same lesson line as the sentence the question matched. What matched: the same doer «door» (+2); the same property (+1); the same light verb (be, have, do, get, go) (+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/technology/42-olympiad-machines-at-home-and-in-the-factory/t2/)

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### Test 3 · ★★★ · wrong ✗ {#t3}

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★★★ «my e-scooter battery's gone a bit puffy and warm, no biggie lol» What does it really mean?

- **1.** A real danger: tell an adult and never press or pierce it — **✓ the right answer** · score 5
- **2.** Nothing, puffy batteries just hold extra charge — **← Mova's choice** · score 6
- **3.** Press it flat again so it fits back in — no support
- **4.** Pop it in the freezer for an hour to cool it right down so it is safe — score 1

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**Why:** It took the question to ask what it is done to. It chose option 2 with score 6, against 5 for the next best. Its support: lesson 34, line 11: «A car battery is heavy, starts the engine and powers the lights when the engine is off; it contains acid, so only adults deal with it, and car batteries are am…», reached through the option's own match among the sentences about the question's things. What matched: the same action «contain» (+3); a different thing acted on (counts against) (+2); the same doer «battery» (+1). The right option, 1, scored 5. · [the question and its options parsed, with trees and pragmatics](https://md.mova.elamur.ai/free/en/corpora/questions/technology/42-olympiad-machines-at-home-and-in-the-factory/t3/)

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### Test 4 · ★★★ · wrong ✗ {#t4}

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★★★ «we got 2 bikes and a trike — no wait, 2 trikes. how many wheels in the shed then»

- **1.** 7 — **← Mova's choice** · no support
- **2.** 8 — no support
- **3.** 10 — **✓ the right answer** · no support
- **4.** 12 — 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/technology/42-olympiad-machines-at-home-and-in-the-factory/t4/)

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### Test 5 · ★★★ · wrong ✗ {#t5}

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★★★ «lights went off when I plugged in the toaster, Dad flicked a switch in the box and they came back. magic or what» What happened?

- **1.** The light bulbs got scared of the toaster and turned off — **← Mova's choice** · no support
- **2.** Too much current flowed, so a breaker switched the circuit off — **✓ the right answer** · no support
- **3.** The power station switched the whole town off — no support
- **4.** The toaster used up all the house's electricity for the day — 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/technology/42-olympiad-machines-at-home-and-in-the-factory/t5/)

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### Test 6 · ★★★ · right ✓ {#t6}

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★★★ «we're stuck in the lift, air's gonna run out, smash the doors!» What is right?

- **1.** Hold your breath as long as you can to save the air until help comes — no support
- **2.** Smash the doors and climb out between floors — no support
- **3.** Jump up and down to get the lift moving again — score 3
- **4.** Press the alarm and wait calmly; lifts are not airtight — **← Mova's choice** · **✓ the right answer** · 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 3 for the next best. Its support: lesson 26, line 12: «The alarm button in a lift rings a bell or calls a help centre; if stuck, stay calm, press it and wait, and never try to climb out. The air will not run out, b…», reached through a sentence linked to the one the question matched. What matched: the same doer «lifts» (+3); the same property (+1); the same light verb (be, have, do, get, go) (+1). · [the question and its options parsed, with trees and pragmatics](https://md.mova.elamur.ai/free/en/corpora/questions/technology/42-olympiad-machines-at-home-and-in-the-factory/t6/)

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### Test 7 · ★★★ · wrong ✗ {#t7}

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★★★ Eva is 11 and 128 cm; Leo is 8 and 136 cm. Who still needs a booster in the UK?

- **1.** Both of them — **← Mova's choice** · score 5
- **2.** Neither of them — score 5
- **3.** Only Leo — score 5
- **4.** Only Eva — **✓ the right answer** · score 5

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**Why:** It took the question to ask who or what does it. It chose option 1 with score 5, tied with another option at 5 (the first shown, or the one claiming less beyond what it knows, wins). Its support: lesson 8, line 12: «Crash tests are why every seat has a belt and children need the right car seat or booster for their size, so the belt sits across them safely.», reached through the remembered sentence the question matched. What matched: the same thing acted on «right car seat» (+4); the same action «need» (+3). Against it: a different doer (counts against) (-2). The right option, 4, scored 5. · [the question and its options parsed, with trees and pragmatics](https://md.mova.elamur.ai/free/en/corpora/questions/technology/42-olympiad-machines-at-home-and-in-the-factory/t7/)

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### Test 8 · ★★★ · right ✓ {#t8}

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★★★ «yeast is just a powder that makes bread puff, like baking soda innit» What is right?

- **1.** Yes, it fizzes like a sweet when water touches it — no support
- **2.** No, yeast is the flour that has been ground extra fine — no support
- **3.** No, yeast is a tiny living fungus whose gas makes the bubbles — **← Mova's choice** · **✓ the right answer** · score 4
- **4.** Yes, yeast is a kind of salt with no life in it at all — no support

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**Why:** It took the question to ask which statement is true. It chose option 3 with score 4, the only option with support. Its support: lesson 3, line 10: «Yeast is a tiny living fungus (a relative of mushrooms), and the bubbles in bread are the gas it gives off.», reached through the option's own match among the sentences about the question's things. What matched: the same doer «yeast» (+2); the same thing acted on «tiny living fungus» (+1); the same light verb (be, have, do, get, go) (+1). · [the question and its options parsed, with trees and pragmatics](https://md.mova.elamur.ai/free/en/corpora/questions/technology/42-olympiad-machines-at-home-and-in-the-factory/t8/)

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### Test 9 · ★★★ · wrong ✗ {#t9}

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★★★ «the washer spun like a billion times, it literally walked across the floor» What really made it walk?

- **1.** It really spun a billion times in one wash — **← Mova's choice** · score 2
- **2.** The clothes bunched on one side, so the drum wobbled — **✓ the right answer** · score 2
- **3.** Its concrete blocks fell out of the back — no support
- **4.** The water froze inside it — no support

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**Why:** It took the question to ask a circumstance (with what, when, how). It chose option 1 with score 2, tied with another option at 2 (the first shown, or the one claiming less beyond what it knows, wins). Its support: lesson 15, line 14: «A lawnmower blade can spin about fifty times a second and can throw stones, so children stay indoors or far away while it runs and never ride on or near a ride…», reached through the remembered sentence the question matched. What matched: the same action «spin» (+2); the same property (+2). Against it: a different doer (counts against) (-2). The right option, 2, scored 2. · [the question and its options parsed, with trees and pragmatics](https://md.mova.elamur.ai/free/en/corpora/questions/technology/42-olympiad-machines-at-home-and-in-the-factory/t9/)

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### Test 10 · ★★★ · wrong ✗ {#t10}

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★★★ «if microwaves can't get through the door holes, how come I can see the food?» What is the answer?

- **1.** Microwaves are see-through, so light and microwaves pass together — **← Mova's choice** · no support
- **2.** The door glass is the only part that lets anything through — no support
- **3.** The holes are too small for microwaves but big enough for light — **✓ the right answer** · no support
- **4.** You can't really see it; the picture is a screen — 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/technology/42-olympiad-machines-at-home-and-in-the-factory/t10/)

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### Test 11 · ★★★ · right ✓ {#t11}

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★★★ A worker says: «the belt's jammed, just reach in quick, it'll be fine.» What should happen first?

- **1.** Stop the machine before anyone touches it — **← Mova's choice** · **✓ the right answer** · no support
- **2.** Pull the jam out with a scarf so hands stay clean — no support
- **3.** Kick the belt hard with your boot until it starts moving again — no support
- **4.** Reach in quickly while it is still running slowly — 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/technology/42-olympiad-machines-at-home-and-in-the-factory/t11/)

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

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A chain wheel bearing 40 teeth drives a rear cog bearing 20 teeth. Determine the number of revolutions of the rear wheel corresponding to 3 revolutions of the pedals.

- **1.** Six — **← Mova's choice** · **✓ the right answer** · no support
- **2.** Sixty — no support
- **3.** Three — no support
- **4.** Two — 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/technology/42-olympiad-machines-at-home-and-in-the-factory/e1/)

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

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Select the response consistent with the established facts concerning the operation of a domestic refrigerator.

- **1.** It destroys heat by means of a chemical reaction — **← Mova's choice** · no support
- **2.** It manufactures cold air, which it stores within its walls — no support
- **3.** It transfers heat from its interior and releases it from pipes at the rear — **✓ the right answer** · no support
- **4.** It cools the room in which it is placed when its door is left open — 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/technology/42-olympiad-machines-at-home-and-in-the-factory/e2/)

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### Exam question 3 · formal language · right ✓ {#e3}

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It is given that a child in the United Kingdom is 11 years of age and 128 cm in height. Ascertain whether a booster seat is required.

- **1.** It is not required, the child being over 10 years of age — score 2
- **2.** It is required solely on journeys of more than one hour — score 6
- **3.** It is not required, boosters being intended for infants alone — score 2
- **4.** It is required, the child being under both 12 years and 135 cm — **← Mova's choice** · **✓ the right answer** · score 8

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**Why:** It took the question to ask which statement is true. It chose option 4 with score 8, against 6 for the next best. Its support: lesson 8, line 12: «Crash tests are why every seat has a belt and children need the right car seat or booster for their size, so the belt sits across them safely.», reached through the remembered sentence the question matched. What matched: the same action «need» (+4); the same thing acted on «right car seat» (+4). · [the question and its options parsed, with trees and pragmatics](https://md.mova.elamur.ai/free/en/corpora/questions/technology/42-olympiad-machines-at-home-and-in-the-factory/e3/)

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

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Identify the item which a spinning magnet in a sorting plant expels from the conveyor belt.

- **1.** The aluminium can — **← Mova's choice** · **✓ the right answer** · no support
- **2.** The plastic bottle — no support
- **3.** The steel can — no support
- **4.** The paper carton — 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/technology/42-olympiad-machines-at-home-and-in-the-factory/e4/)

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- ← previous: [41. Rivers, canals and boats: locks, weirs, water-mi…](https://md.mova.elamur.ai/free/en/school-run/technology/41-rivers-canals-and-boats-locks-weirs-water-mills-barges-and-how-not-to-tip-a-rowing-boat/)
- next →: [43. Olympiad: transport, building and energy ★★★](https://md.mova.elamur.ai/free/en/school-run/technology/43-olympiad-transport-building-and-energy/)
- ↑ back to [Technology](https://md.mova.elamur.ai/free/en/school-run/technology/)