Wind, sun and other clean energy

Tests: 4 of 11 right · Exam: 1 of 4 right · Kind: ★★ · Understood: 11 of 15 · Run: 2026-10-18, commit f3c23ea72

Lesson 33 of the technology 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 ✓

«solar panels are useless in England, it's always cloudy innit» What is the best correction?

1. You are right, they only work in full bright sunshine — score 8
2. They still work on cloudy days, just less — ← Mova's choice · ✓ the right answer · score 10
3. They work only if the clouds are white — score 8
4. They work only in summer at noon — score 8

Why: It took the question to ask which statement is true. It chose option 2 with score 10, against 8 for the next best. Its support: lesson 33, line 7: «In a solar panel, light hits special silicon cells and knocks tiny electrons free, which flow as electricity; panels still work on cloudy days and in winter, j…», reached through the remembered sentence the question matched. What matched: the same action «work» (+4); the same doer «panels» (+4); the same property (+2). · the question and its options parsed, with trees and pragmatics

Test 2 · ★★ · right ✓

In a cartoon, a giant blows on a wind turbine to light up a city at night. What is true about real wind turbines?

1. They light the city with lamps on the blades — no support
2. The turbines need people to push them — no support
3. The wind turns the blades and a generator makes electricity — ← Mova's choice · ✓ the right answer · score 6
4. The turbines blow the wind to make clouds — no support

Why: It took the question to ask which statement is true. It chose option 3 with score 6, the only option with support. Its support: lesson 33, line 2: «A wind turbine is a giant windmill. The wind pushes its long blades round, the blades turn a shaft, and a generator in the box at the top makes electricity, ju…», reached through the same lesson line as the sentence the question matched. What matched: the same action «make» (+2); the same doer «generator» (+2); the same thing acted on «electricity» (+2). · the question and its options parsed, with trees and pragmatics

Test 3 · ★★ · wrong ✗

What would happen to a solar garden light if you covered its panel with a box for a week?

1. Nothing, it runs on air — score 2
2. It would glow brighter than before — ← Mova's choice · score 4
3. Its battery would not charge, so it would stop lighting up — ✓ the right answer · no support
4. It would charge from the warmth of the ground instead of light — score 4

Why: It took the question to ask what happens next. It chose option 2 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 33, line 10: «A solar garden light charges a small battery from a little panel during the day, and a light sensor switches it on when it gets dark.», reached through what followed the sentence the question matched. What matched: the same doer «panel» (+4). The right option, 3, found no support in what it remembers. · the question and its options parsed, with trees and pragmatics

Test 4 · ★★ · wrong ✗

«tides are just the wind pushing the sea about» What is the best correction?

1. Tides are caused mainly by the Moon pulling the sea — ✓ the right answer · score 7
2. Right, the wind pushes the sea in and out every single day — ← Mova's choice · score 8
3. Tides come from whales and big fish all swimming together — no support
4. Tides come from rain filling the sea up and then draining away — no support

Why: It took the question to ask which statement is true. It chose option 2 with score 8, against 7 for the next best. Its support: lesson 21, line 3: «Stand on a platform when a fast train rushes through without stopping: the wind tugs at your coat and the train is past almost before you heard it coming. That…», reached through the remembered sentence the question matched. What matched: the same action «tug» (+4); the same doer «wind» (+4). The right option, 1, scored 7. · the question and its options parsed, with trees and pragmatics

Test 5 · ★★ · wrong ✗

Count them: a small offshore wind farm has 4 rows with 5 turbines in each row. How many turbines?

1. 25 — ← Mova's choice · no support
2. 9 — no support
3. 15 — no support
4. 20 — ✓ 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 6 · ★★ · wrong ✗

Count them: each turbine has 3 blades. How many blades on 6 turbines?

1. 12 — ← Mova's choice · no support
2. 18 — ✓ the right answer · no support
3. 9 — no support
4. 24 — 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 · ★★ · right ✓

Count them: a solar farm has 3 strips of grass between its rows of panels, with 4 sheep grazing on each strip. How many sheep?

1. 12 — ← Mova's choice · ✓ the right answer · no support
2. 16 — no support
3. 9 — no support
4. 7 — 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 ✓

«we put our potato peelings in the food bin, so what, it just rots» What can really happen?

1. It is fed into the wind turbines to make them spin faster — score 2
2. It is packed into rockets and sent up to the Moon to rot there — score 2
3. Bacteria can turn it into biogas that makes electricity — ← Mova's choice · ✓ the right answer · score 6
4. It is burned straight away in a power station with the coal — score 2

Why: It took the question to ask what it is done to. It chose option 3 with score 6, against 2 for the next best. Its support: lesson 33, line 13: «In a biogas plant, bacteria break down food waste and manure and make a gas that can be burned for electricity or heat, so a food waste bin can end up making e…», reached through the remembered sentence the question matched. What matched: it fills the role the question asks for (+4); the same action «make» (+2); the same thing acted on «electricity» (+2). Against it: a different doer (counts against) (-2). · the question and its options parsed, with trees and pragmatics

Test 9 · ★★ · wrong ✗

Two bottles of water lie in the sun, one painted white and one painted black. Which warms faster, and why?

1. The white one, because it reflects heat inwards — ← Mova's choice · score 8
2. Both the same, colour does not matter — no support
3. The white one, because white soaks up more sunlight — score 5
4. The black one, because black soaks up more sunlight — ✓ the right answer · score 5

Why: It took the question to ask who or what does it. It chose option 1 with score 8, against 5 for the next best. Its support: lesson 33, line 1: «Some energy never runs out. The wind keeps blowing, the Sun keeps shining, the Moon keeps pulling the tides and the deep Earth stays hot; energy from sources l…», reached through the option's own match among the sentences about the question's things. What matched: the same action «shine» (+3); it fills the role the question asks for (+3); the same doer «sun» (+2). The right option, 4, scored 5. · the question and its options parsed, with trees and pragmatics

Test 10 · ★★ · wrong ✗

«why not just switch off every gas station tomorrow and use wind» What is the main problem?

1. On calm nights there is little wind or sun, so we still need other sources and storage — ✓ the right answer · no support
2. The wind would run out after a week — no support
3. Wind turbines are too quiet to work at night — no support
4. Wind makes more pollution than gas — ← Mova's choice · score 2

Why: It took the question to ask why something happens (its cause). It chose option 4 with score 2, the only option with support. Its support: lesson 32, line 1: «Almost all the electricity in your house was made by something spinning. In a power station, steam, gas, wind or falling water spins a turbine, a wheel of blad…», reached through the option's own match among the sentences about the question's things. What matched: the same doer «steam» (+2); the same circumstance (+2). 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 11 · ★★ · wrong ✗

Why does Iceland find it easy to heat homes with geothermal energy?

1. It has a lot of hot rock and hot water close under the ground — ✓ the right answer · no support
2. It burns ice to make heat — ← Mova's choice · score 5
3. It has the most wind turbines of any country in the whole world — no support
4. It is the sunniest country in Europe — no support

Why: It took the question to ask why something happens (its cause). It chose option 2 with score 5, the only option with support. Its support: lesson 33, line 12: «Geothermal energy uses heat from deep underground to warm water, make steam or heat homes; Iceland, a land of volcanoes with hot rock and hot water close under…», reached through the option's own match among the sentences about the question's things. What matched: the same thing acted on «heat» (+3); the same doer «geothermal energy» (+2). The right option, 1, found no support in what it remembers. · the question and its options parsed, with trees and pragmatics

Exam question 1 · formal language · wrong ✗

Which of the following statements most accurately characterises renewable energy?

1. It derives from sources not exhausted by use, such as wind and sunlight — ✓ the right answer · score 6
2. It is derived exclusively from coal and oil of very recent extraction from the ground — no support
3. It is energy which may be employed on one occasion only and is then lost for ever — ← Mova's choice · score 8
4. It is energy which is cheaper than every alternative in every country of the world — score 7

Why: It took the question to ask who or what does it. It chose option 3 with score 8, against 7 for the next best. Its support: lesson 33, line 12: «Geothermal energy uses heat from deep underground to warm water, make steam or heat homes; Iceland, a land of volcanoes with hot rock and hot water close under…», reached through the option's own match among the sentences about the question's things. What matched: the same action «use» (+3); it fills the role the question asks for (+3); the same doer «geothermal energy» (+2). The right option, 1, scored 6. · the question and its options parsed, with trees and pragmatics

Exam question 2 · formal language · wrong ✗

Identify the principal process by which a solar cell produces electricity.

1. Light heats water into steam which rotates a turbine — ← Mova's choice · score 3
2. Light rotates a small wheel concealed within the panel — no support
3. Light liberates electrons within the silicon, which then flow as an electric current — ✓ the right answer · no support
4. Light is stored in the form of a chemical fuel — no support

Why: It took the question to ask which statement is true. It chose option 1 with score 3, the only option with support. Its support: lesson 32, line 5: «In a power station, fuel or another source heats water into steam, which spins a turbine; the turbine turns a generator, where magnets and coils of wire make e…», reached through the same lesson line as the sentence the question matched. What matched: the same action «heat» (+2); the same thing acted on «water» (+2). Against it: a different doer (counts against) (-1). The right option, 3, found no support in what it remembers. · the question and its options parsed, with trees and pragmatics

Exam question 3 · formal language · wrong ✗

Ascertain the principal cause of the tides employed in tidal power stations.

1. The movement of large marine animals — ← Mova's choice · no support
2. The gravitational attraction exerted by the Moon upon the oceans — ✓ the right answer · no support
3. The discharge of rivers into the sea — no support
4. The action of the wind blowing steadily upon the surface of the sea — 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 consistent with the established facts concerning the impossibility, at present, of relying solely upon wind and solar energy.

1. They emit more carbon dioxide than coal — no support
2. Their output varies with the weather and the time of day, so storage and other sources are required — ← Mova's choice · ✓ the right answer · score 6
3. Their use is prohibited in the majority of countries — no support
4. They operate exclusively during the summer months — no support

Why: It took the question to ask which statement is true. It chose option 2 with score 6, the only option with support. Its support: lesson 33, line 16: «We cannot use only wind and sun yet, because they come and go with the weather and the time of day, so the grid also needs storage and other sources.», reached through the same lesson line as the sentence the question matched. What matched: the same action «need» (+2); the same thing acted on «storage» (+2); its «because» matches the remembered cause (+2). · the question and its options parsed, with trees and pragmatics

This page in Markdown → https://md.mova.elamur.ai/free/en/school-run/technology/33-wind-sun-and-other-clean-energy/