---
title: Olympiad: sound, light, heat, electricity and magnets ★★★ — how Mova does on the tests · Physics
description: Lesson 43 of the physics course of Mova's primary school: 4 of 11 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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# Olympiad: sound, light, heat, electricity and magnets ★★★

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**Tests:** 4 of 11 right · **Exam:** 1 of 4 right · **Kind:** ★★★ · **Understood:** 6 of 15 · **Run:** 2026-10-18, commit `f3c23ea72`

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Lesson 43 of the physics 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/physics/43-olympiad-sound-light-heat-and-magnets/).

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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/physics/43-olympiad-sound-light-heat-and-magnets/).

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### Test 1 · ★★★ · wrong ✗ {#t1}

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Cerys, in Cardiff: "It's chucking it down, mun, and the thunder's a million miles off." She counts 6 seconds after the flash. How far is the storm?

- **1.** About 6 kilometres — **← Mova's choice** · no support
- **2.** About 2 kilometres — **✓ the right answer** · no support
- **3.** About 18 kilometres — no support
- **4.** A million miles away — 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/physics/43-olympiad-sound-light-heat-and-magnets/t1/)

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### Test 2 · ★★★ · wrong ✗ {#t2}

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"Counted 9 secs after the flash, no wait, 15." About how far is the storm?

- **1.** About 45 kilometres — **← Mova's choice** · no support
- **2.** About 5 kilometres — **✓ the right answer** · no support
- **3.** About 3 kilometres — no support
- **4.** About 9 kilometres — 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/physics/43-olympiad-sound-light-heat-and-magnets/t2/)

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### Test 3 · ★★★ · wrong ✗ {#t3}

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Your bro swears he heard the lightning first and then saw the flash. Fair?

- **1.** No, the two always arrive at the same moment — **← Mova's choice** · no support
- **2.** No, the light gets to you first — **✓ the right answer** · no support
- **3.** Yes, sound always travels faster than light — no support
- **4.** Yes, in heavy rain the sound overtakes it — 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/physics/43-olympiad-sound-light-heat-and-magnets/t3/)

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### Test 4 · ★★★ · wrong ✗ {#t4}

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In a cartoon, a spaceship blows up with a huge BOOM heard by heroes in another ship far away. Fix it.

- **1.** They would hear it, but only a minute or so later — score 2
- **2.** They would hear it but see nothing — **← Mova's choice** · score 6
- **3.** They would see the blast but hear nothing — **✓ the right answer** · no support
- **4.** It would be even louder out in space — no support

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**Why:** It took the question to ask which statement is true. It chose option 2 with score 6, against 2 for the next best. Its support: lesson 20, line 2: «We see most things because some of that light bounces off them into our eyes; in a room with no light at all you see nothing, however long you wait.», reached through the option's own match among the sentences about the question's things. What matched: the same thing acted on «nothing» (+4); the same action «see» (+2). The right option, 3, 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/physics/43-olympiad-sound-light-heat-and-magnets/t4/)

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### Test 5 · ★★★ · right ✓ {#t5}

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"Bruh, this metal bench is way colder than the wooden one, no cap." Both have been out all night. Put him right.

- **1.** Metal makes its own cold when it's dark — no support
- **2.** The wood is the colder one, it just hides it — no support
- **3.** He's right, metal is always colder than wood — no support
- **4.** Both are equally cold; metal draws heat out of your hand faster — **← Mova's choice** · **✓ the right answer** · score 3

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**Why:** It took the question to ask which statement is true. It chose option 4 with score 3, the only option with support. Its support: lesson 23, line 4: «Your skin does not measure temperature; it feels how fast heat leaves it, so a metal bench feels colder than a wooden one on the same frosty morning, though bo…», reached through the option's own match among the sentences about the question's things. What matched: the same doer «metal bench» (+3). · [the question and its options parsed, with trees and pragmatics](https://md.mova.elamur.ai/free/en/corpora/questions/physics/43-olympiad-sound-light-heat-and-magnets/t5/)

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### Test 6 · ★★★ · wrong ✗ {#t6}

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A Kiwi mum: "Run the jar under the hot tap, it'll open, sweet as." ("sweet as" means great.) Why does it work?

- **1.** The heat melts glue under the lid — no support
- **2.** The metal lid grows more than the glass — **✓ the right answer** · no support
- **3.** The glass shrinks away from the lid as it warms — no support
- **4.** The hot water makes the lid slippery — **← Mova's choice** · score 1

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**Why:** It took the question to ask why something happens (its cause). It chose option 4 with score 1, the only option with support. Its support: lesson 16, line 4: «Warmth changes pressure too: a warm gas pushes harder, a cold one pushes less, so a balloon in the freezer shrinks and a jar sealed hot pulls its lid in as it…», reached through the option's own match among the sentences about the question's things. What matched: the same action «pull in» (+1); the same thing acted on «lid» (+1). Against it: a different doer (counts against) (-1). The right option, 2, 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/physics/43-olympiad-sound-light-heat-and-magnets/t6/)

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### Test 7 · ★★★ · right ✓ {#t7}

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Leo: "Fridge makes cold, so leave the door open and the kitchen cools down, ez." What's wrong?

- **1.** Nothing, the kitchen will soon get very cold — no support
- **2.** A fridge only moves heat out of the box into the room — **← Mova's choice** · **✓ the right answer** · score 4
- **3.** The fridge would freeze the whole kitchen — no support
- **4.** It works, but only in the middle of winter — no support

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**Why:** It took the question to ask which statement is true. It chose option 2 with score 4, the only option with support. Its support: lesson 24, line 13: «A fridge or freezer does not make cold; it pumps heat out of the box and lets it go at the back, which feels warm, and its motor adds a little heat of its own.», reached through a sentence linked to the one the question matched. What matched: the same thing acted on «heat» (+3); the same place «box» (+3). Against it: a different action (counts against) (-1); 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/physics/43-olympiad-sound-light-heat-and-magnets/t7/)

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### Test 8 · ★★★ · right ✓ {#t8}

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Your compass swings the wrong way while you hold a steel torch right next to it. Why?

- **1.** The steel pulls the needle harder than the Earth does — **← Mova's choice** · **✓ the right answer** · no support
- **2.** The batteries in the torch make the north pole move about — no support
- **3.** Compasses only work in bright daylight — no support
- **4.** The torch beam pushes the needle round — 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/physics/43-olympiad-sound-light-heat-and-magnets/t8/)

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### Test 9 · ★★★ · wrong ✗ {#t9}

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Riya, dusting the TV: "It's literally a dust magnet, I've wiped it a million times." What really pulls the dust on?

- **1.** The light from the screen drawing it in — no support
- **2.** A real magnet hidden inside the screen — **← Mova's choice** · score 8
- **3.** The heat of the screen sucking it in — no support
- **4.** A little electric charge on the screen — **✓ the right answer** · no support

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**Why:** It took the question to ask what it is done to. It chose option 2 with score 8, the only option with support. Its support: lesson 29, line 13: «Two small strong magnets swallowed by a child can pull together through the walls of the gut and badly damage it; this is an emergency.», reached through the remembered sentence the question matched. What matched: it fills the role the question asks for (+6); the same thing acted on «two small strong magnets» (+4). Against it: a different action (counts against) (-2). 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/physics/43-olympiad-sound-light-heat-and-magnets/t9/)

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### Test 10 · ★★★ · right ✓ {#t10}

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Put these in order, fastest first: light, sound in steel, sound in air.

- **1.** Light, sound in steel, sound in air — **← Mova's choice** · **✓ the right answer** · no support
- **2.** Sound in steel, light, sound in air — no support
- **3.** Light, sound in air, sound in steel — no support
- **4.** Sound in air, sound in steel, light — 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/physics/43-olympiad-sound-light-heat-and-magnets/t10/)

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### Test 11 · ★★★ · wrong ✗ {#t11}

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Dirty snow and clean snow lie side by side in the sunshine. Which melts first?

- **1.** Neither, ever — no support
- **2.** Both at once — no support
- **3.** The clean snow — **← Mova's choice** · score 8
- **4.** The dirty snow — **✓ the right answer** · score 8

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**Why:** It took the question to ask who or what does it. It chose option 3 with score 8, tied with another option at 8 (the first shown, or the one claiming less beyond what it knows, wins). Its support: lesson 24, line 17: «Dirty snow melts faster than clean snow, because the dark dirt soaks up sunlight.», 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 action «melt» (+2); the same doer «dirty snow» (+2); the same property (+1). The right option, 4, scored 8. · [the question and its options parsed, with trees and pragmatics](https://md.mova.elamur.ai/free/en/corpora/questions/physics/43-olympiad-sound-light-heat-and-magnets/t11/)

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

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Calculate the approximate distance of a storm whose thunder is heard 21 seconds after its lightning is seen.

- **1.** About 63 kilometres — **← Mova's choice** · no support
- **2.** About 21 kilometres — no support
- **3.** About 3 kilometres — no support
- **4.** About 7 kilometres — **✓ 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/physics/43-olympiad-sound-light-heat-and-magnets/e1/)

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

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Identify the colour of a white garment illuminated solely by red light.

- **1.** Red — **← Mova's choice** · **✓ the right answer** · no support
- **2.** Black — no support
- **3.** White — no support
- **4.** Green — 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/physics/43-olympiad-sound-light-heat-and-magnets/e2/)

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

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Determine the result of dividing a bar magnet into two parts.

- **1.** Two pieces devoid of magnetism — **← Mova's choice** · no support
- **2.** One magnet and one inert piece — no support
- **3.** Two magnets, each having both poles — **✓ the right answer** · no support
- **4.** Two separate single poles — 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/physics/43-olympiad-sound-light-heat-and-magnets/e3/)

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

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Select the metal which a magnet does not attract.

- **1.** Steel — **← Mova's choice** · no support
- **2.** Nickel — no support
- **3.** Aluminium — **✓ the right answer** · no support
- **4.** Wrought iron — 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/physics/43-olympiad-sound-light-heat-and-magnets/e4/)

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- ← previous: [42. Olympiad: forces, floating and machines ★★★](https://md.mova.elamur.ai/free/en/school-run/physics/42-olympiad-forces-floating-and-machines/)
- next →: [44. Olympiad: speed, space and seasons ★★★](https://md.mova.elamur.ai/free/en/school-run/physics/44-olympiad-speed-space-and-seasons/)
- ↑ back to [Physics](https://md.mova.elamur.ai/free/en/school-run/physics/)