Fuels, the Sun and saving energy

Tests: 6 of 11 right · Exam: 2 of 4 right · Kind: ★★ · Understood: 9 of 15 · Run: 2026-10-18, commit f3c23ea72

Lesson 32 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 ✓

dad's like "turn the lights off, we're not made of money". why tho?

1. Turned-off bulbs charge themselves up — no support
2. Leaving lights on makes them brighter — no support
3. Making electricity costs money and often burns fuel — ← Mova's choice · ✓ the right answer · score 5
4. Lights only work for a few hours each day, then break — no support

Why: It took the question to ask why something happens (its cause). It chose option 3 with score 5, the only option with support. Its support: lesson 32, line 8: «Coal, oil and gas power stations burn fuel to heat water into steam, and the steam spins turbines that make electricity.», reached through the same lesson line as the sentence the question matched. What matched: the same action «burn» (+4); the same thing acted on «fuel» (+2). Against it: a different doer (counts against) (-1). · the question and its options parsed, with trees and pragmatics

Test 2 · ★★ · right ✓

A pan of oil catches fire on the cooker. Why would putting a lid or fire blanket over it help?

1. It cools the hot pan down straight away — no support
2. It turns the burning oil into plain water — no support
3. It cuts off the oxygen the fire needs — ← Mova's choice · ✓ the right answer · score 5
4. It squashes the flames flat against the oil — no support

Why: It took the question to ask why something happens (its cause). It chose option 3 with score 5, the only option with support. Its support: lesson 32, line 7: «A fire needs fuel, oxygen and heat; take one away and it goes out, and a fire blanket works by keeping the oxygen out.», reached through the option's own match among the sentences about the question's things. What matched: the same action «need» (+3); the same doer «fire» (+2). · the question and its options parsed, with trees and pragmatics

Test 3 · ★★ · right ✓

Mia says the Sun burns coal like a giant fireplace. Put it right.

1. It burns wood from old forests — no support
2. It shines by fusion, hydrogen joining together deep inside — ← Mova's choice · ✓ the right answer · score 3
3. It is lit by lightning every morning — no support
4. It reflects light from the Moon — no support

Why: It took the question to ask which statement is true. It chose option 2 with score 3, the only option with support. Its support: lesson 32, line 17: «The Sun shines because tiny parts of hydrogen join together deep inside it, a process called fusion, and it will keep shining for about another five billion ye…», reached through the option's own match among the sentences about the question's things. What matched: the same action «join» (+3). · the question and its options parsed, with trees and pragmatics

Test 4 · ★★ · wrong ✗

What would happen if everyone kept using oil much faster than it forms?

1. It would turn into coal — ← Mova's choice · score 4
2. Nothing, oil never runs out — score -2
3. It would grow back each spring — no support
4. It would eventually run out — ✓ the right answer · score 4

Why: It took the question to ask what happens next. 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 7, line 3: «To make it bigger, we use rubber, chalk and rough surfaces: try opening a stuck jar with a rubber glove and it turns at once.», reached through the option's own match among the sentences about the question's things. What matched: the same action «turn» (+2); the same doer «oil» (+2). The right option, 4, scored 4. · the question and its options parsed, with trees and pragmatics

Test 5 · ★★ · right ✓

A town wants energy that will never run out. Which should it choose?

1. Wind and solar power — ← Mova's choice · ✓ the right answer · score 8
2. Bigger oil tanks — no support
3. Burning old car tyres — no support
4. More coal power stations — score 8

Why: It took the question to ask who or what does it. It chose option 1 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 32, line 4: «Wind, sunshine and flowing water keep coming back, so they are called renewable, and the cleanest energy of all is the energy you do not waste: lights off, LED…», reached through the same lesson line as the sentence the question matched. What matched: it fills the role the question asks for (+5); the same doer «wind» (+4). Against it: a different action (counts against) (-1). · the question and its options parsed, with trees and pragmatics

Test 6 · ★★ · wrong ✗

Why does your little cousin's houseplant lean towards the window?

1. It wants to see the garden — ← Mova's choice · no support
2. Plants always lean over towards any glass and windows — no support
3. Its leaves are stretching for the light they need — ✓ the right answer · no support
4. It is being blown by a draught — 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 ✗

shut up and pedal, the lamp's only bright when we're going fast, whyyy

1. The lamp gets scared when you stop — ← Mova's choice · no support
2. The dynamo makes more electricity when the wheel spins faster — ✓ the right answer · no support
3. It's the wind that lights it — no support
4. The battery only charges when you are fast — 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 8 · ★★ · wrong ✗

In a cartoon, a sledge rolls up a hill all by itself with nobody pushing. What's wrong?

1. Snow pushes things uphill — ← Mova's choice · no support
2. Going up a hill needs energy from something, like a push or a motor — ✓ the right answer · no support
3. Nothing, sledges love going uphill — no support
4. Sledges can only go sideways — 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 ✗

After a long drive the bonnet of the car is too hot to touch. Why?

1. The radio inside the car heats the whole bonnet up — ← Mova's choice · no support
2. The tyres rubbed against the bonnet and made it hot — no support
3. The engine turned much of its fuel into heat — ✓ the right answer · no support
4. Sunlight was shining down on it all the way home — 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 · ★★ · right ✓

The Sun has shone for billions of years. Will it go out tomorrow?

1. Yes, it is nearly out of coal — no support
2. Yes, it goes out every hundred years and lights up again — score 1
3. Nobody has any idea at all — no support
4. No, it has fuel for about another five billion years — ← 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, against 1 for the next best. Its support: lesson 32, line 17: «The Sun shines because tiny parts of hydrogen join together deep inside it, a process called fusion, and it will keep shining for about another five billion ye…», reached through the option's own match among the sentences about the question's things. What matched: the same doer «sun» (+2). · the question and its options parsed, with trees and pragmatics

Test 11 · ★★ · right ✓

Which loses more energy as wasted heat: a petrol car engine or an electric car's motor?

1. The petrol engine — ← Mova's choice · ✓ the right answer · score 6
2. Neither loses any energy as heat — score 6
3. The electric motor — score 6
4. Both lose exactly the same — no support

Why: It took the question to ask who or what does it. 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 32, line 1: «A log on a campfire holds energy the tree caught from sunlight; burning joins the wood with oxygen from the air and lets that energy out as heat and light.», reached through the remembered sentence the question matched. What matched: the same thing acted on «energy» (+3); the same circumstance (+3). · the question and its options parsed, with trees and pragmatics

Exam question 1 · formal language · wrong ✗

Identify the three requisites for the sustenance of combustion.

1. Smoke, ash and sparks — ← Mova's choice · no support
2. Fuel, oxygen and heat — ✓ the right answer · no support
3. Water, wind and light — no support
4. Electricity, metal and air — 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

Exam question 2 · formal language · wrong ✗

Which of the following statements most accurately characterises renewable sources of energy?

1. They are manufactured afresh in factories each day — ← Mova's choice · no support
2. They may be employed on a single occasion only — no support
3. They are replenished naturally and are not depleted by use — ✓ the right answer · no support
4. They are derived exclusively from the burning of coal and wood — 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 ✓

Ascertain the principal environmental objection to the combustion of fossil fuels.

1. It releases carbon dioxide into the atmosphere, thereby warming the planet — ← Mova's choice · ✓ the right answer · score 2
2. It causes the oceans to freeze — no support
3. It renders the generated electricity excessively powerful — no support
4. It depletes the oxygen supply of every household — no support

Why: It took the question to ask which statement is true. It chose option 1 with score 2, the only option with support. Its support: lesson 32, line 3: «Coal, oil and gas power stations burn fuel to boil water into steam that spins turbines, but these fossil fuels took millions of years to form, will run out, a…», reached through the same lesson line as the sentence the question matched. What matched: the same thing acted on «planet» (+2); the same action «warm» (+1). Against it: a different doer (counts against) (-1). · the question and its options parsed, with trees and pragmatics

Exam question 4 · formal language · right ✓

Select the response consistent with the established facts concerning the efficiency of light-emitting diode lamps.

1. They convert the greater part of their energy into heat — no support
2. They yield equal illumination for a fraction of the electrical energy — ← Mova's choice · ✓ the right answer · score 5
3. They consume more energy but yield superior colour — no support
4. They require no electrical supply whatsoever — 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 32, line 14: «An LED bulb gives the same light as an old bulb for a fraction of the electricity.», reached through the option's own match among the sentences about the question's things. What matched: the same action «give» (+3); the same circumstance (+2). · the question and its options parsed, with trees and pragmatics

This page in Markdown → https://md.mova.elamur.ai/free/en/school-run/physics/32-fuels-the-sun-and-saving-energy/