Energy — where it comes from and how to save it
Tests: 7 of 12 right · Exam: 1 of 4 right · Kind: plain · Understood: 5 of 16 · Run: 2026-10-18, commit f3c23ea72
Lesson 56 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 ✗
A town builds a dam on a river to make electricity. What kind of energy source is it using?
- 1. Energy made from nothing — ← Mova's choice · no support
- 2. A renewable one, flowing water — ✓ the right answer · no support
- 3. A fossil fuel from the riverbed — no support
- 4. A non-renewable one, like coal — 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 ✓
A family wants to use less energy. Which plan helps most?
- 1. Walk to the nearby shop and switch off unused lights — ← Mova's choice · ✓ the right answer · no support
- 2. Leave chargers and screens on all night — no support
- 3. Keep the heating on with windows open — no support
- 4. Drive to the nearby shop every day — 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 3 · right ✓
Why will the world eventually run short of oil but not of sunshine?
- 1. Oil forms far too slowly, but the Sun keeps shining — ← Mova's choice · ✓ the right answer · no support
- 2. The Sun is made of oil — no support
- 3. Sunshine is stored underground — no support
- 4. Oil is all used up already — 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 · right ✓
A lamb grows by eating grass. Where did the energy in the lamb first come from?
- 1. The farmer's tractor — score 7
- 2. The rain on the field — score 7
- 3. The soil the grass grew in — no support
- 4. The Sun, through the grass — ← Mova's choice · ✓ the right answer · score 15
Why: It took the question to ask where. It chose option 4 with score 15, against 7 for the next best. Its support: lesson 56, line 9: «Food gives our bodies energy, and that energy came from the Sun through plants.», reached through the remembered sentence the question matched. What matched: it fills the role the question asks for (+5); the same action «come» (+4); the same doer «energy» (+3); the same place «sun» (+3). · the question and its options parsed, with trees and pragmatics
Test 5 · right ✓
Which is true about a wind turbine?
- 1. It burns fuel to spin — no support
- 2. It turns the movement of wind into electricity — ← Mova's choice · ✓ the right answer · score 9
- 3. It works only when there is no wind blowing at all — no support
- 4. It makes the wind blow harder — score 3
Why: It took the question to ask which statement is true. It chose option 2 with score 9, against 3 for the next best. Its support: lesson 56, line 4: «Sunlight, wind, flowing water and the heat inside the Earth will not run out — they are renewable. Solar panels turn sunlight into electricity, and wind turbin…», reached through the remembered sentence the question matched. What matched: the same place «electricity» (+4); the same action «turn» (+3); the same doer «wind turbines» (+2). · the question and its options parsed, with trees and pragmatics
Test 6 · wrong ✗
When coal is burned in a power station, what happens to its energy?
- 1. It is made bigger by the fire in the boiler — ← Mova's choice · no support
- 2. It changes into heat and then electricity — ✓ the right answer · no support
- 3. It turns back into living plants in the soil — no support
- 4. It disappears completely into the air for ever — 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 ✗
Why do many countries build more solar panels and wind turbines?
- 1. They make the weather warmer — score 3
- 2. They are renewable and do not release carbon dioxide while working — ✓ the right answer · score 5
- 3. They are made from oil and gas — ← Mova's choice · score 6
- 4. They work without sunlight or wind — score 3
Why: It took the question to ask why something happens (its cause). It chose option 3 with score 6, against 5 for the next best. Its support: lesson 44, line 1: «The United States of America is a huge country in North America made of 50 states; its capital is Washington, D.C., which is not in any state, and its largest…», reached through the option's own match among the sentences about the question's things. What matched: the same action «make» (+3); the same thing acted on «huge country» (+3). The right option, 2, scored 5. · the question and its options parsed, with trees and pragmatics
Test 8 · wrong ✗
A toy car runs on a battery until it stops. What has happened?
- 1. The wheels have stored up all of the energy inside them — ← Mova's choice · no support
- 2. The battery has turned into coal — no support
- 3. The chemical energy in the battery has been used — ✓ the right answer · no support
- 4. The car has become too heavy — 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 · right ✓
where'd the energy in my cereal come from
- 1. From the Sun, through the plants — ← Mova's choice · ✓ the right answer · no support
- 2. From the big machines at the factory — no support
- 3. From the bowl it was poured into — no support
- 4. From the milk carton in the fridge — 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 ✗
whats a solar panel actually do
- 1. It turns wind into heat — ← Mova's choice · no support
- 2. It makes the sun brighter — no support
- 3. It changes sunlight into electricity — ✓ the right answer · no support
- 4. It stores coal for later, like a battery — 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 11 · right ✓
my friend says a battery makes energy out of nothing. true?
- 1. Yes, that is why they never run out — no support
- 2. Yes, batteries make new energy — score 2
- 3. No, batteries store only heat inside — score 3
- 4. No, it stores chemical energy — ← Mova's choice · ✓ the right answer · score 6
Why: It took the question to ask which statement is true. It chose option 4 with score 6, against 3 for the next best. Its support: lesson 55, line 9: «A battery stores chemical energy and pushes electricity around a circuit.», reached through the remembered sentence the question matched. What matched: the same action «store» (+3); the same doer «battery» (+2); the same thing acted on «chemical energy» (+1). · the question and its options parsed, with trees and pragmatics
Test 12 · right ✓
a video said burning coal is clean and doesn't change the climate. right?
- 1. Yes, coal smoke is clean — no support
- 2. No, it releases carbon dioxide which warms the climate — ← Mova's choice · ✓ the right answer · score 5
- 3. Yes, coal cools the Earth — no support
- 4. No, coal releases only water — 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 47, line 4: «Burning coal, oil and gas also puts smoke and carbon dioxide into the air, which dirties the air we breathe and warms the climate of the whole planet.», reached through the same lesson line as the sentence the question matched. What matched: the same action «warm» (+4); the same thing acted on «climate» (+2). Against it: a different doer (counts against) (-1). · the question and its options parsed, with trees and pragmatics
Exam question 1 · formal language · wrong ✗
Ascertain the principal source of the greater part of the energy available upon the Earth.
- 1. The Earth's oceans — ← Mova's choice · no support
- 2. The Moon — no support
- 3. The Sun — ✓ the right answer · no support
- 4. The Earth's magnetism — 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 · wrong ✗
Identify the principal reason for which coal, oil and natural gas are designated non-renewable.
- 1. They are wholly incapable of combustion in any furnace — ← Mova's choice · no support
- 2. Their formation requires millions of years — ✓ the right answer · no support
- 3. They are derived from sunlight directly — no support
- 4. They are replenished upon each day — 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 3 · formal language · right ✓
Select, from the sources hereinafter enumerated, that which is designated a renewable source of energy.
- 1. The wind — ← Mova's choice · ✓ the right answer · no support
- 2. Coal — no support
- 3. Natural gas — no support
- 4. Petroleum — 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 · wrong ✗
Which of the following statements most accurately characterises the nature of energy?
- 1. It is destroyed entirely upon each use — ← Mova's choice · no support
- 2. It exists solely in living organisms — no support
- 3. It is created from nothing whenever a machine is operated — no support
- 4. It is converted from one form into another but is never created from nothing — ✓ 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
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