Mirrors, shadows and colours

Tests: 6 of 13 right · Exam: 2 of 4 right · Kind: plain · Understood: 14 of 17 · Run: 2026-10-18, commit f3c23ea72

Lesson 84 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 · right ✓

You want to shine a torch beam onto a toy hidden around a corner. What can help?

1. A clear glass window pane at the corner — no support
2. A sheet of thick cardboard in the corner — no support
3. A black cloth hung right across the corner — no support
4. A flat mirror placed at the corner — ← Mova's choice · ✓ the right answer · score 8

Why: It took the question to ask who or what does it. It chose option 4 with score 8, the only option with support. Its support: lesson 84, line 2: «A periscope uses two mirrors to bend the path of light twice, so you can see over a wall or out of a submarine. Curved mirrors change the picture: a mirror tha…», reached through the remembered sentence the question matched. What matched: the same place «wing mirrors» (+6); the same thing acted on «mirror» (+1); a different action (counts against) (+1). · the question and its options parsed, with trees and pragmatics

Test 2 · right ✓

A flagpole's shadow points to the west. Where in the sky is the Sun?

1. In the east — ← Mova's choice · ✓ the right answer · score 8
2. Straight overhead — score 5
3. In the west — score 6
4. In the north at night — score 8

Why: It took the question to ask where. 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 60, line 10: «In the morning the Sun is in the east, so shadows point west; in the evening they point east.», reached through a sentence linked to the one the question matched. What matched: it fills the role the question asks for (+3); the same doer «sun» (+2); the same place «east» (+2); the same light verb (be, have, do, get, go) (+1). · the question and its options parsed, with trees and pragmatics

Test 3 · wrong ✗

Which is true about rainbows?

1. You see one when you look straight at the Sun — no support
2. Every rainbow has its colours in a new order — no support
3. You see one when you face away from the Sun — ✓ the right answer · no support
4. Rainbows only appear when there is no rain — ← 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 84, line 5: «A rainbow appears when the Sun is behind you and rain is in front of you: each raindrop bends and reflects the sunlight and splits it into colours. Its colours…», reached through the remembered sentence the question matched. What matched: the same action «appear» (+4); the same doer «rainbow» (+1). The right option, 3, found no support in what it remembers. · the question and its options parsed, with trees and pragmatics

Test 4 · wrong ✗

You put a coin in an empty cup and move back until it just hides behind the rim. A friend pours in water and the coin appears. Why?

1. The water lifts the coin up off the bottom towards the rim — score 1
2. Light from the coin bends as it leaves the water — ✓ the right answer · score 4
3. The cup becomes see-through when it is wet — no support
4. The water makes the coin shine more brightly — ← Mova's choice · score 6

Why: It took the question to ask why something happens (its cause). It chose option 4 with score 6, against 4 for the next best. Its support: lesson 43, line 4: «Water shapes the land too: a river carries sand and stones that scrape its bed, and over thousands of years it cuts a deep valley shaped like the letter V; whe…», reached through the option's own match among the sentences about the question's things. What matched: the same action «build» (+3); the same doer «water» (+3). The right option, 2, scored 4. · the question and its options parsed, with trees and pragmatics

Test 5 · right ✓

Why are mirrors that bulge outwards used on cars?

1. They help the car go faster — no support
2. They make the driver's face look smaller — no support
3. They make cars behind look closer — no support
4. They show more of the road behind — ← Mova's choice · ✓ the right answer · score 6

Why: It took the question to ask why something happens (its cause). It chose option 4 with score 6, the only option with support. Its support: lesson 84, line 9: «A mirror that bulges outwards shows a wider view than a flat one.», reached through the option's own match among the sentences about the question's things. What matched: the same action «show» (+3); the same doer «mirror» (+3). · the question and its options parsed, with trees and pragmatics

Test 6 · wrong ✗

A child stands in the same spot at 9 o'clock, at 12 o'clock and at 3 o'clock on a sunny day. When is the shadow shortest?

1. At 9 o'clock — no support
2. At 12 o'clock — ✓ the right answer · no support
3. It is the same all day — ← Mova's choice · score 4
4. At 3 o'clock — 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 38, line 11: «Children should be active for about an hour every day.», reached through the option's own match among the sentences about the question's things. What matched: the same doer «children» (+2); the same property (+1); the same light verb (be, have, do, get, go) (+1). The right option, 2, found no support in what it remembers. · the question and its options parsed, with trees and pragmatics

Test 7 · wrong ✗

You shine white light through a red filter and then through a green filter. What do you see?

1. Bright yellow light like the Sun — ← Mova's choice · score 10
2. Bright white light — score 10
3. Almost no light at all — ✓ the right answer · score 10
4. Red and green stripes — no support

Why: It took the question to ask what it is done to. It chose option 1 with score 10, tied with another option at 10 (the first shown, or the one claiming less beyond what it knows, wins). Its support: lesson 79, line 9: «Bees can see ultraviolet light, which people cannot see; many flowers have ultraviolet patterns that guide bees to the nectar.», reached through the option's own match among the sentences about the question's things. What matched: the same action «see» (+5); it fills the role the question asks for (+3); the same thing acted on «ultraviolet light» (+2). The right option, 3, scored 10. · the question and its options parsed, with trees and pragmatics

Test 8 · right ✓

A sailor in a submarine wants to see ships on the surface. Which tool helps?

1. A periscope — ← Mova's choice · ✓ the right answer · score 5
2. A magnifying glass — no support
3. A prism — no support
4. A sundial — no support

Why: It took the question to ask who or what does it. It chose option 1 with score 5, the only option with support. Its support: lesson 84, line 2: «A periscope uses two mirrors to bend the path of light twice, so you can see over a wall or out of a submarine. Curved mirrors change the picture: a mirror tha…», reached through the same lesson line as the sentence the question matched. What matched: it fills the role the question asks for (+4); the same doer «periscope» (+3). Against it: a different action (counts against) (-2). · the question and its options parsed, with trees and pragmatics

Test 9 · wrong ✗

Which shows that light bends when it changes material?

1. A spoon in water looks bent — ✓ the right answer · no support
2. A shadow points away from a lamp — ← Mova's choice · score 9
3. A mirror shows writing reversed — no support
4. A black shirt gets hot in sunshine — no support

Why: It took the question to ask who or what does it. It chose option 2 with score 9, the only option with support. Its support: lesson 84, line 3: «Shadows change during the day because the Sun's position in the sky changes. In the morning and evening the Sun is low and shadows are long; around midday it i…», reached through the option's own match among the sentences about the question's things. What matched: it fills the role the question asks for (+4); the same doer «shadow» (+3); the same action «point away» (+2). The right option, 1, found no support in what it remembers. · the question and its options parsed, with trees and pragmatics

Test 10 · right ✓

why is my shadow massive this arvo but tiny at lunch

1. The Sun gets bigger in the afternoon — no support
2. Shadows grow longer as you get tired — score 4
3. Shadows are longest in morning and evening and shortest around midday — ← Mova's choice · ✓ the right answer · score 5
4. The ground gets darker as the day goes on — no support

Why: It took the question to ask which statement is true. It chose option 3 with score 5, against 4 for the next best. Its support: lesson 60, line 4: «Because light travels in straight lines, a shadow points away from the Sun. In the morning and evening the Sun is low, so shadows are long; at midday the Sun i…», reached through the same lesson line as the sentence the question matched. What matched: the same doer «shadows» (+3); the same property (+1); the same light verb (be, have, do, get, go) (+1). · the question and its options parsed, with trees and pragmatics

Test 11 · wrong ✗

wanna see a rainbow, where's the sun gotta be

1. Right above you at midday — ← Mova's choice · no support
2. Hidden behind thick clouds — no support
3. In front of you, with rain behind you — no support
4. Behind you, with rain in front of you — ✓ 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 12 · wrong ✗

Mia says a mirror flips things upside down. true?

1. Yes, but only in a big mirror — no support
2. No, a mirror shows things exactly as they are — ← Mova's choice · score 4
3. No, it shows writing back to front, not upside down — ✓ the right answer · score 4
4. Yes, everything in a mirror is upside down — no support

Why: It took the question to ask which statement is true. 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 84, line 9: «A mirror that bulges outwards shows a wider view than a flat one.», reached through the option's own match among the sentences about the question's things. What matched: the same action «show» (+3); the same doer «mirror» (+2). Against it: a different thing acted on (counts against) (-1). The right option, 3, scored 4. · the question and its options parsed, with trees and pragmatics

Test 13 · right ✓

my mate reckons a red filter turns all light red. right?

1. No, it lets every colour through except red — score 1
2. No, it lets only red light through and blocks the other colours — ← Mova's choice · ✓ the right answer · score 6
3. Yes, but only white light turns red — no support
4. Yes, it paints every colour red — score 1

Why: It took the question to ask which statement is true. It chose option 2 with score 6, against 1 for the next best. Its support: lesson 84, line 17: «A red filter lets only red light through and blocks the other colours.», reached through the remembered sentence the question matched. What matched: the same action «block» (+4); the same doer «red filter» (+1); the same thing acted on «other colours» (+1). · the question and its options parsed, with trees and pragmatics

Exam question 1 · formal language · right ✓

Which of the following statements most accurately characterises the reflection of light by a mirror?

1. Light is split into the colours of the rainbow — no support
2. Light is reflected straight back whatever its angle — score 6
3. Light is absorbed and none is reflected — no support
4. Light is reflected at the same angle at which it arrives — ← Mova's choice · ✓ the right answer · score 8

Why: It took the question to ask who or what does it. It chose option 4 with score 8, against 6 for the next best. Its support: lesson 84, line 6: «A mirror reflects light at the same angle as the light arrives.», reached through the remembered sentence the question matched. What matched: the same place «same angle» (+6); the same action «reflect» (+1); the same thing acted on «light» (+1). · the question and its options parsed, with trees and pragmatics

Exam question 2 · formal language · wrong ✗

Identify the instrument which employs two mirrors to permit vision over obstacles.

1. A filter — ← Mova's choice · no support
2. A prism — no support
3. A sundial — no support
4. A periscope — ✓ 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 3 · formal language · wrong ✗

It is given that the Sun stands behind an observer and rain falls before him. Ascertain the phenomenon which may thereby be observed.

1. A mirage — ← Mova's choice · no support
2. A shooting star — no support
3. A rainbow — ✓ the right answer · no support
4. An eclipse — 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 a red filter.

1. It permits only red light to pass and blocks the other colours — ← Mova's choice · ✓ the right answer · score 2
2. It permits all colours save red to pass — no support
3. It blocks red light and permits white light to pass — no support
4. It converts all colours into red light — 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 84, line 17: «A red filter lets only red light through and blocks the other colours.», reached through the option's own match among the sentences about the question's things. What matched: the same action «block» (+3). Against it: a different doer (counts against) (-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/84-mirrors-shadows-colours/