Magnets: pulling and pushing without touching
Tests: 6 of 11 right · Exam: 2 of 4 right · Kind: plain · Understood: 9 of 15 · Run: 2026-10-18, commit f3c23ea72
Lesson 29 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.
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 ✓
my sister says magnets stick to all metals. right?
- 1. No, mainly iron, steel, nickel and cobalt are pulled — ← Mova's choice · ✓ the right answer · score 6
- 2. Yes, every metal is magnetic — no support
- 3. Yes, but only shiny metals — no support
- 4. No, magnets only stick to plastic — no support
Why: It took the question to ask which statement is true. It chose option 1 with score 6, the only option with support. Its support: lesson 29, line 6: «Magnets pull iron and steel without touching them, and the pull fades quickly with distance.», reached through the remembered sentence the question matched. What matched: the same action «pull» (+3); the same thing acted on «iron» (+3). · the question and its options parsed, with trees and pragmatics
Test 2 · right ✓
Jake wants a magnet with only a north pole, so he cuts his magnet in half. What does he get?
- 1. Two magnets, each with north and south — ← Mova's choice · ✓ the right answer · score 10
- 2. One north magnet and one south one, as he hoped — score 8
- 3. One magnet and one bit of dust — score 10
- 4. Two non-magnetic bits of metal — no support
Why: It took the question to ask what it is done to. It chose option 1 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 29, line 10: «A magnet is made of countless tiny magnets lined up together, so a magnet cut in half becomes two magnets, each with both poles.», reached through the remembered sentence the question matched. What matched: it fills the role the question asks for (+6); the same thing acted on «magnet» (+4). · the question and its options parsed, with trees and pragmatics
Test 3 · wrong ✗
How could you make a paper clip dance on top of a table without touching it?
- 1. Move a magnet underneath the table — ✓ the right answer · no support
- 2. Blow on the paper clip very gently — no support
- 3. Rub the table with a balloon — ← Mova's choice · score 0
- 4. Tap the table with a pencil — no support
Why: It took the question to ask what something is like. It chose option 3 with score 0, the only option with support. Its support: lesson 26, line 2: «Rub a balloon on your hair and electrons move from your hair to the balloon; opposite charges pull, so your hair reaches for the balloon, while hairs with the…», reached through the option's own match among the sentences about the question's things. What matched: the same action «rub» (+1); the same circumstance (+1). Against it: a different thing acted on (counts against) (-2). The right option, 1, found no support in what it remembers. · the question and its options parsed, with trees and pragmatics
Test 4 · wrong ✗
A toddler has swallowed two small round magnets from a toy. What should happen?
- 1. Give her a glass of milk and forget it — ← Mova's choice · no support
- 2. Hold a big magnet to her tummy to pull them out — no support
- 3. Get medical help straight away; it is an emergency — ✓ the right answer · no support
- 4. Wait, they will come out by themselves — 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 ✓
In a cartoon, a hero uses a huge magnet to pull a gold bar out of a safe. What's wrong?
- 1. Magnets cannot work through a safe door — no support
- 2. Nothing, gold is strongly magnetic — no support
- 3. Magnets only work in the dark — no support
- 4. Gold is not pulled by magnets — ← Mova's choice · ✓ the right answer · score 2
Why: It took the question to ask which statement is true. It chose option 4 with score 2, the only option with support. Its support: lesson 29, line 16: «An electric motor spins because electricity in a coil of wire makes it a magnet that is pushed and pulled by other magnets.», reached through the option's own match among the sentences about the question's things. What matched: the same action «pull» (+3); the same doer «magnet» (+2). Against it: one says «not», the other does not (counts against) (-3). · the question and its options parsed, with trees and pragmatics
Test 6 · right ✓
Why could a child trapped inside a modern fridge still push the door open?
- 1. The door is held only by a magnet, not a lock — ← Mova's choice · ✓ the right answer · no support
- 2. The fridge door is made of soft rubber — no support
- 3. Fridges open by themselves whenever it gets warm inside — no support
- 4. The light inside unlocks the door — 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 7 · wrong ✗
Chloe pushes two magnets together and feels a soft springy push. What is happening?
- 1. The magnets have run out of power — no support
- 2. Air is trapped between the magnets and squashed — no support
- 3. Unlike poles are pulling together — ← Mova's choice · score 3
- 4. Like poles are pushing each other apart — ✓ the right answer · no support
Why: It took the question to ask which statement is true. It chose option 3 with score 3, 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 option's own match among the sentences about the question's things. What matched: the same action «pull together» (+3). The right option, 4, found no support in what it remembers. · the question and its options parsed, with trees and pragmatics
Test 8 · right ✓
oi, stop stroking my sewing needle with that magnet!! what's it gonna do?
- 1. Turn the needle into a weak magnet — ← Mova's choice · ✓ the right answer · no support
- 2. Make the needle pull on plastic things — no support
- 3. Nothing at all — no support
- 4. Melt the needle a little bit — 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 9 · wrong ✗
Why does a maglev train hardly lose any speed to friction?
- 1. It travels only downhill — ← Mova's choice · no support
- 2. No wheels touch the track — ✓ the right answer · no support
- 3. The track is greased with oil — no support
- 4. The train is made of feathers — 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 ✗
What would happen to a toy car's motor if there were no magnets inside it?
- 1. It would not spin — ✓ the right answer · score 3
- 2. It would turn into a magnet — score 2
- 3. It would spin twice as fast — ← Mova's choice · score 9
- 4. It would spin backwards — score 9
Why: It took the question to ask what happens next. It chose option 3 with score 9, tied with another option at 9 (the first shown, or the one claiming less beyond what it knows, wins). Its support: lesson 29, line 16: «An electric motor spins because electricity in a coil of wire makes it a magnet that is pushed and pulled by other magnets.», reached through what followed the sentence the question matched. What matched: the same action «spin» (+5); the same doer «electric motor» (+4). The right option, 1, scored 3. · the question and its options parsed, with trees and pragmatics
Test 11 · right ✓
Ella scatters iron filings round a magnet and they bunch up at the two ends. What does that tell her?
- 1. The magnet is broken in the middle — no support
- 2. The filings are scared of the middle — no support
- 3. The ends of the magnet are wet — no support
- 4. The pull is strongest at the poles — ← Mova's choice · ✓ the right answer · score 4
Why: It took the question to ask what it is done to. It chose option 4 with score 4, the only option with support. Its support: lesson 29, line 9: «Iron filings sprinkled around a magnet line up and show its invisible magnetic field; the lines bunch up at the poles, where the pull is strongest.», reached through the same lesson line as the sentence the question matched. What matched: the same doer «pull» (+2); the same property (+1); the same light verb (be, have, do, get, go) (+1). · the question and its options parsed, with trees and pragmatics
Exam question 1 · formal language · wrong ✗
Identify which of the following materials is strongly attracted by a magnet.
- 1. Plastic — ← Mova's choice · no support
- 2. Steel — ✓ the right answer · no support
- 3. Aluminium — no support
- 4. Copper — 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 ✓
Ascertain the consequence of severing a bar magnet transversely into two portions.
- 1. Each portion constitutes a complete magnet possessing both poles — ← Mova's choice · ✓ the right answer · score 5
- 2. Both portions forfeit their magnetic properties entirely — no support
- 3. One portion possesses solely a north pole and the other a south — no support
- 4. The magnetism is retained by the larger portion alone — no support
Why: It took the question to ask which statement is true. It chose option 1 with score 5, the only option with support. Its support: lesson 29, line 8: «Every magnet has a north pole and a south pole: like poles push apart, unlike poles pull together.», reached through the option's own match among the sentences about the question's things. What matched: the same thing acted on «north pole» (+3); the same doer «magnet» (+2). · the question and its options parsed, with trees and pragmatics
Exam question 3 · formal language · right ✓
Which of the following statements most accurately characterises the interaction between two magnetic poles of like kind?
- 1. They repel one another — ← Mova's choice · ✓ the right answer · score 10
- 2. They attract only when separated by water — score 10
- 3. They attract one another — score 10
- 4. They neither attract nor repel — score 10
Why: It took the question to ask who or what does it. It chose option 1 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 29, line 2: «Every magnet has two ends, a north pole and a south pole; bring two north poles together and you feel them push apart like an invisible cushion, turn one round…», reached through the remembered sentence the question matched. What matched: it fills the role the question asks for (+6); the same doer «pole» (+4). · the question and its options parsed, with trees and pragmatics
Exam question 4 · formal language · wrong ✗
Select the response consistent with the established facts concerning the operation of an electric motor.
- 1. Fuel is combusted within a small chamber — ← Mova's choice · no support
- 2. Static charge accumulates and propels the axle — no support
- 3. A spring is wound and released by the battery — no support
- 4. A current-carrying coil is acted upon by magnetic forces and rotates — ✓ 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/physics/29-magnets-pulling-and-pushing-without-touching/