Metals and what they're good for

Tests: 4 of 10 right · Exam: 3 of 4 right · Kind: plain · Understood: 9 of 14 · Run: 2026-10-18, commit f3c23ea72

Lesson 31 of the chemistry 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 ✗

Zoe: "magnets stick to all metal, that's what makes it metal". What's true?

1. Only gold and silver are magnetic — ← Mova's choice · no support
2. Metals are magnetic only when hot — no support
3. Only a few metals, like iron, are magnetic — ✓ the right answer · no support
4. She's right, every metal is magnetic — 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 · right ✓

Dad stirs the pan with a metal spoon and yelps: "bloody handle's red hot!" What should he use?

1. A wet metal spoon — score 6
2. A thinner metal spoon — score 6
3. A gold spoon, which never gets hot — score 4
4. A wooden spoon, which stays cool — ← Mova's choice · ✓ the right answer · score 11

Why: It took the question to ask what it is done to. It chose option 4 with score 11, against 6 for the next best. Its support: lesson 31, line 1: «Leave a metal spoon in hot soup and soon the handle is too hot to hold, while a wooden spoon stays cool. Metals pass heat along very well, and electricity too,…», reached through the remembered sentence the question matched. What matched: the same action «stay» (+5); the same doer «wooden spoon» (+4); the same property (+2). · the question and its options parsed, with trees and pragmatics

Test 3 · wrong ✗

If wires inside a house were made of wood instead of copper, what would happen?

1. Nothing at all would change — ← Mova's choice · no support
2. Electricity would not flow through them — ✓ the right answer · no support
3. Every light in the house would be much brighter — no support
4. The house would be warmer — 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 4 · wrong ✗

"pure gold is the best for rings, it's the hardest metal". What's true?

1. Pure gold is soft and scratches easily — ✓ the right answer · score 9
2. Pure gold never bends at all — no support
3. Pure gold is the hardest metal — ← Mova's choice · score 10
4. Pure gold can cut glass — no support

Why: It took the question to ask which statement is true. It chose option 3 with score 10, against 9 for the next best. Its support: lesson 31, line 9: «Gold, silver and platinum are precious metals: rare, beautiful, and hardly reacting with air, although silver slowly tarnishes.», reached through the remembered sentence the question matched. What matched: the same thing acted on «precious metals» (+5); the same doer «gold» (+3); the same light verb (be, have, do, get, go) (+2). The right option, 1, scored 9. · the question and its options parsed, with trees and pragmatics

Test 5 · right ✓

A British penny from 2010 sticks to your magnet. Why?

1. The magnet is made of copper — no support
2. Copper is very strongly magnetic indeed — no support
3. It is steel with a thin copper coat — ← Mova's choice · ✓ the right answer · score 9
4. It is a fake coin — no support

Why: It took the question to ask why something happens (its cause). It chose option 3 with score 9, the only option with support. Its support: lesson 31, line 12: «Some coins, such as British pennies made since 1992, are steel with a thin copper coat, so they stick to a magnet.», reached through the cause of the sentence the question matched. What matched: the same thing acted on «steel» (+4); the same circumstance (+4); the same light verb (be, have, do, get, go) (+2). Against it: a different doer (counts against) (-1). · the question and its options parsed, with trees and pragmatics

Test 6 · right ✓

In a video game, a hero builds a bridge from pure gold. What's wrong with that?

1. Gold is too soft and rare for a bridge — ← Mova's choice · ✓ the right answer · score 7
2. Gold melts in the sunshine — no support
3. Gold rusts very fast in the rain and falls apart — no support
4. Gold is too light for a bridge — no support

Why: It took the question to ask which statement is true. It chose option 1 with score 7, the only option with support. Its support: lesson 31, line 10: «Pure gold is so soft that it scratches easily, so most gold jewellery is gold mixed with other metals.», reached through the remembered sentence the question matched. What matched: the same doer «pure gold» (+3); the same property (+2); the same light verb (be, have, do, get, go) (+2). · the question and its options parsed, with trees and pragmatics

Test 7 · wrong ✗

Why would a Bronze Age smith add tin to copper?

1. To make the copper float — ← Mova's choice · no support
2. To make the copper magnetic — no support
3. To make the copper rust less — no support
4. To make a harder metal, bronze — ✓ 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 8 · right ✓

"whack steel on a rock, sparks, so the rock's full of fire, right?"

1. Yes, the sparks are tiny stones — no support
2. No, tiny bits of hot steel burn as sparks — ← Mova's choice · ✓ the right answer · score 5
3. Yes, flint has lots of fire stored up inside it — no support
4. No, the sparks are from the air — no support

Why: It took the question to ask which statement is true. It chose option 2 with score 5, the only option with support. Its support: lesson 26, line 8: «The sparks of a sparkler are tiny bits of burning iron or aluminium; a sparkler gets hotter than 1000 °C, much hotter than an oven.», reached through the remembered sentence the question matched. What matched: the same doer «tiny bits» (+3); the same property (+2). · the question and its options parsed, with trees and pragmatics

Test 9 · wrong ✗

Two bikes look the same; one is steel and one is aluminium. Which is lighter?

1. The aluminium one — ✓ the right answer · no support
2. It depends on the colour — no support
3. They weigh the same — ← Mova's choice · score 2
4. The steel one — no support

Why: It took the question to ask which statement is true. It chose option 3 with score 2, the only option with support. Its support: lesson 1, line 19: «When ice melts, the same water molecules (a molecule = a small group of atoms joined together) are there before and after; melted ice weighs the same as the ic…», reached through the option's own match among the sentences about the question's things. What matched: the same thing acted on «same» (+2); the same action «weigh» (+1). Against it: a different doer (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 · wrong ✗

If people recycled all metal and stopped throwing it away, what would happen?

1. More mining would be needed — ← Mova's choice · no support
2. Less mining would be needed — ✓ the right answer · no support
3. Metal would run out faster — no support
4. Bikes would get heavier — 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 ✓

Identify the principal reason for which electrical conductors are customarily fabricated from copper.

1. Copper is the most abundant metal in rocks — no support
2. Copper is the least dense of all metals — no support
3. Copper is an excellent conductor of electricity — ← Mova's choice · ✓ the right answer · score 2
4. Copper is attracted strongly by magnets — no support

Why: It took the question to ask which statement is true. It chose option 3 with score 2, the only option with support. Its support: lesson 31, line 6: «Copper conducts electricity very well, so electric wires are made of copper, while wood and plastic hardly let electricity through, which is why the wire has a…», reached through the option's own match among the sentences about the question's things. What matched: the same circumstance (+2); the same doer «copper» (+1). Against it: a different thing acted on (counts against) (-1). · the question and its options parsed, with trees and pragmatics

Exam question 2 · formal language · right ✓

Which of the following statements most accurately characterises steel?

1. An alloy of iron with a small proportion of carbon — ← Mova's choice · ✓ the right answer · score 4
2. A compound of aluminium and oxygen — no support
3. A pure element found free in nature in large lumps — no support
4. An alloy of copper with tin — score 4

Why: It took the question to ask who or what does it. It chose option 1 with score 4, tied with another option at 4 (the first shown, or the one claiming less beyond what it knows, wins). Its support: lesson 31, line 3: «Mixing metals makes alloys that are better than the pure metals: copper with tin makes bronze, and iron with a little carbon makes steel, strong enough for bri…», reached through the same lesson line as the sentence the question matched. What matched: it fills the role the question asks for (+3); the same doer «alloys» (+2). Against it: a different thing acted on (counts against) (-1). · the question and its options parsed, with trees and pragmatics

Exam question 3 · formal language · wrong ✗

It is given that a magnet is presented to a series of objects. Select the object which will be attracted.

1. A copper pipe — ← Mova's choice · no support
2. A steel fridge door — ✓ the right answer · no support
3. An aluminium beverage can — no support
4. A gold ring — 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 ✓

Ascertain the principal reason for which titanium is employed in hip replacements.

1. It is the most magnetic of metals — no support
2. It is luminous in darkness — no support
3. It is well tolerated by the human body — ← Mova's choice · ✓ the right answer · score 4
4. It is the softest of metals — no support

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 31, line 17: «Titanium is also used for hip replacements because the body accepts it well.», reached through a sentence linked to the one the question matched. What matched: the same doer «body» (+2); the same thing acted on «titanium» (+2); the same property (+1). Against it: a different action (counts against) (-1). · the question and its options parsed, with trees and pragmatics

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