Magnets

Tests: 5 of 13 right · Exam: 2 of 4 right · Kind: ★ · Understood: 13 of 17 · Run: 2026-10-18, commit f3c23ea72

Lesson 81 of the world 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 ✗

You have a mix of steel pins and sand. How could you separate them?

1. Shake them until the sand floats — ← Mova's choice · no support
2. Heat them until the sand burns — no support
3. Pour water to melt the pins — no support
4. Pull the pins out with a magnet — ✓ 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 2 · ★ · wrong ✗

Two ring magnets on a pencil float apart, one above the other. Why?

1. The pencil is pushing them up — no support
2. Air is trapped between them — no support
3. Unlike poles are facing each other and attract — ← Mova's choice · score 1
4. Like poles are facing each other and repel — ✓ the right answer · score 1

Why: It took the question to ask why something happens (its cause). It chose option 3 with score 1, tied with another option at 1 (the first shown, or the one claiming less beyond what it knows, wins). Its support: lesson 81, line 2: «Every magnet has two ends called poles, a north pole and a south pole, where the pull is strongest; two unlike poles attract each other, and two like poles pus…», reached through the same lesson line as the sentence the question matched. What matched: the same doer «two like poles» (+1); the same thing acted on «each» (+1). Against it: a different action (counts against) (-1). The right option, 4, scored 1. · the question and its options parsed, with trees and pragmatics

Test 3 · ★ · wrong ✗

A drinks can is not picked up by a magnet. What is it probably made of?

1. Steel — ← Mova's choice · score 6
2. Aluminium — ✓ the right answer · score 4
3. Nickel — score 6
4. Iron — score 6

Why: It took the question to ask a circumstance (with what, when, how). It chose option 1 with score 6, tied with another option at 6 (the first shown, or the one claiming less beyond what it knows, wins). Its support: lesson 81, line 6: «Magnets attract iron, steel, nickel and cobalt.», reached through the remembered sentence the question matched. What matched: it fills the role the question asks for (+6); the same circumstance (+4). Against it: a different action (counts against) (-2); a different thing acted on (counts against) (-2). The right option, 2, scored 4. · the question and its options parsed, with trees and pragmatics

Test 4 · ★ · wrong ✗

Which is true?

1. A magnet pulls harder from far away — ← Mova's choice · no support
2. A magnet attracts every kind of metal — no support
3. A magnet can attract a clip through your hand — ✓ the right answer · no support
4. A magnet works only when it touches things — 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 5 · ★ · wrong ✗

Lost in a forest with no sun, which tool helps you find north?

1. A magnifying glass — ← Mova's choice · no support
2. A thermometer — no support
3. A compass — ✓ the right answer · no support
4. A ruler — 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 · ★ · wrong ✗

You bring a magnet slowly towards a pin. When does the pin jump to it?

1. Never, pins are not magnetic — no support
2. As soon as the magnet is in the room — no support
3. When the magnet is close enough for the pull to be strong — ✓ the right answer · no support
4. Only when the magnet touches it — ← Mova's choice · score 5

Why: It took the question to ask which statement is true. It chose option 4 with score 5, the only option with support. Its support: lesson 81, line 1: «A magnet pulls things made of iron, steel, nickel and cobalt, even without touching them; most other materials, such as wood, plastic, glass, paper, copper and…», reached through the option's own match among the sentences about the question's things. What matched: the same action «touch» (+3); the same doer «magnet» (+3). Against it: a different thing acted on (counts against) (-1). The right option, 3, found no support in what it remembers. · the question and its options parsed, with trees and pragmatics

Test 7 · ★ · right ✓

A pupil says: «A magnet sticks to the fridge, so it will stick to a copper pan too.» What is wrong?

1. Magnets do not attract copper — ← Mova's choice · ✓ the right answer · score 5
2. Copper is not a metal — score 2
3. Fridges are made of copper — no support
4. Magnets only stick to fridges — no support

Why: It took the question to ask which statement is true. It chose option 1 with score 5, against 2 for the next best. Its support: lesson 81, line 7: «Copper, aluminium, gold and silver are metals that magnets do not attract.», reached through the option's own match among the sentences about the question's things. What matched: the same action «attract» (+3); the same doer «magnets» (+3). Against it: a different thing acted on (counts against) (-1). · the question and its options parsed, with trees and pragmatics

Test 8 · ★ · wrong ✗

What would happen if you broke a magnet into three pieces?

1. The pieces would push away all metals near them — score 3
2. The magnet would lose both of its poles for ever — no support
3. Only the middle piece would still be a magnet at all — ← Mova's choice · score 5
4. Each piece would have a north and a south pole — ✓ the right answer · no support

Why: It took the question to ask what happens next. It chose option 3 with score 5, against 3 for the next best. Its support: lesson 81, line 15: «If you cut a magnet in half, each piece becomes a magnet with its own two poles.», reached through the option's own match among the sentences about the question's things. What matched: the same thing acted on «magnet» (+3); the same doer «piece» (+2). The right option, 4, found no support in what it remembers. · the question and its options parsed, with trees and pragmatics

Test 9 · ★ · wrong ✗

Why can a crane drop scrap metal with an electromagnet but not with a bar magnet?

1. The electromagnet can be switched off — ✓ the right answer · no support
2. The bar magnet is too weak to lift anything — no support
3. The bar magnet melts the metal — ← Mova's choice · score 3
4. The electromagnet repels steel — 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 81, line 7: «Copper, aluminium, gold and silver are metals that magnets do not attract.», reached through the option's own match among the sentences about the question's things. What matched: the same doer «magnets» (+3); the same thing acted on «metals» (+1). Against it: a different action (counts against) (-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 ✓

magnet won't pick up the coins, why

1. The magnet only works through water — no support
2. Coins have their own magnet that pushes back — no support
3. The coins are too heavy for any magnet — no support
4. Some metals, like copper and aluminium, are not attracted by magnets — ← Mova's choice · ✓ the right answer · score 7

Why: It took the question to ask which statement is true. It chose option 4 with score 7, the only option with support. Its support: lesson 81, line 7: «Copper, aluminium, gold and silver are metals that magnets do not attract.», reached through the option's own match among the sentences about the question's things. What matched: the same action «attract» (+3); the same doer «magnets» (+3); the same thing acted on «metals» (+1). · the question and its options parsed, with trees and pragmatics

Test 11 · ★ · right ✓

snapped my magnet in half lol, is it ruined

1. No, each piece becomes a magnet with its own two poles — ← Mova's choice · ✓ the right answer · score 7
2. Yes, each half now has only one pole, either north or south — score 2
3. No, but only one half still works — no support
4. Yes, a broken magnet loses all its pull — score 6

Why: It took the question to ask which statement is true. It chose option 1 with score 7, against 6 for the next best. Its support: lesson 81, line 15: «If you cut a magnet in half, each piece becomes a magnet with its own two poles.», reached through the option's own match among the sentences about the question's things. What matched: the same action «become» (+3); the same doer «piece» (+3); the same thing acted on «magnet» (+1). · the question and its options parsed, with trees and pragmatics

Test 12 · ★ · right ✓

Mia says magnets stick to all metals. true?

1. Yes, every metal is pulled by a magnet — score 6
2. No, magnets stick only to steel — score 3
3. Yes, but only if the metal is shiny — no support
4. No, they attract iron, steel, nickel and cobalt but not copper or gold — ← Mova's choice · ✓ the right answer · score 7

Why: It took the question to ask which statement is true. It chose option 4 with score 7, against 6 for the next best. Its support: lesson 81, line 6: «Magnets attract iron, steel, nickel and cobalt.», reached through the option's own match among the sentences about the question's things. What matched: the same action «attract» (+3); the same doer «magnets» (+3); the same thing acted on «iron» (+1). · the question and its options parsed, with trees and pragmatics

Test 13 · ★ · right ✓

my mate reckons two north poles snap together. right?

1. Yes, but only if the magnets are big — no support
2. No, two north poles do nothing at all — no support
3. No, like poles repel each other — ← Mova's choice · ✓ the right answer · score 6
4. Yes, like poles always attract — score 6

Why: It took the question to ask which statement is true. It chose option 3 with score 6, tied with another option at 6 (the first shown, or the one claiming less beyond what it knows, wins). Its support: lesson 51, line 15: «Opposite poles of two magnets attract and like poles repel.», reached through the option's own match among the sentences about the question's things. What matched: the same action «repel» (+3); the same doer «opposite poles» (+3). · the question and its options parsed, with trees and pragmatics

Exam question 1 · formal language · wrong ✗

Which of the following statements most accurately characterises the metals attracted by a magnet?

1. Copper, aluminium, gold and silver — ← Mova's choice · score 11
2. All metals without exception — no support
3. Iron, steel, nickel and cobalt — ✓ the right answer · no support
4. No metals, only plastics — no support

Why: It took the question to ask who or what does it. It chose option 1 with score 11, the only option with support. Its support: lesson 81, line 7: «Copper, aluminium, gold and silver are metals that magnets do not attract.», reached through the option's own match among the sentences about the question's things. What matched: the same thing acted on «metals» (+4); it fills the role the question asks for (+4); the same doer «copper» (+3). The right option, 3, found no support in what it remembers. · the question and its options parsed, with trees and pragmatics

Exam question 2 · formal language · right ✓

It is given that a magnet is divided into two pieces. Determine the consequence for the pieces thereof.

1. Both pieces lose their magnetism entirely — no support
2. One piece bears only a north pole and the other only a south — no support
3. Only the larger piece remains a magnet — score 3
4. Each piece becomes a magnet with its own two poles — ← Mova's choice · ✓ the right answer · score 7

Why: It took the question to ask which statement is true. It chose option 4 with score 7, against 3 for the next best. Its support: lesson 81, line 15: «If you cut a magnet in half, each piece becomes a magnet with its own two poles.», reached through the option's own match among the sentences about the question's things. What matched: the same action «become» (+3); the same doer «piece» (+3); the same thing acted on «magnet» (+1). · the question and its options parsed, with trees and pragmatics

Exam question 3 · formal language · wrong ✗

Identify the part of a magnet at which its pull is strongest.

1. At the surface facing upwards — ← Mova's choice · no support
2. At its exact middle — no support
3. Equally along its whole length — no support
4. At its poles — ✓ 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

Exam question 4 · formal language · right ✓

Select the response that is consistent with the established facts concerning electromagnets.

1. They are natural stones found in the ground — no support
2. They attract copper and aluminium alone — no support
3. They are made with electricity and may be switched on and off — ← Mova's choice · ✓ the right answer · score 9
4. They remain magnetic for ever once made — no support

Why: It took the question to ask which statement is true. It chose option 3 with score 9, the only option with support. Its support: lesson 81, line 16: «Electromagnets are made with electricity and can be switched on and off.», reached through the remembered sentence the question matched. What matched: the same action «make» (+4); the same circumstance (+4); the same thing acted on «electromagnets» (+1). · the question and its options parsed, with trees and pragmatics

This page in Markdown → https://md.mova.elamur.ai/free/en/school-run/world/81-magnets/