---
title: Light and shadows — how Mova does on the tests · Physics
description: Lesson 20 of the physics course of Mova's primary school: 6 of 10 tests right, exam 1 of 4, every question with the options, the student's choice, the right answer and why it chose.
---

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# Light and shadows

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**Tests:** 6 of 10 right · **Exam:** 1 of 4 right · **Kind:** plain · **Understood:** 8 of 14 · **Run:** 2026-10-18, commit `f3c23ea72`

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Lesson 20 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](https://md.mova.elamur.ai/free/en/corpora/school/physics/20-light-and-shadows/).

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Every question of this lesson and each of its options parsed by Mova, with trees and pragmatics: [the lesson's questions in the corpora](https://md.mova.elamur.ai/free/en/corpora/questions/physics/20-light-and-shadows/).

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### Test 1 · right ✓ {#t1}

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my sis thinks your eyes shoot out beams that hit stuff so u can see. right?

- **1.** No, light from things comes into your eyes — **← Mova's choice** · **✓ the right answer** · score 5
- **2.** No, your ears help you see — no support
- **3.** Yes, but only in the dark — no support
- **4.** Yes, that is exactly how seeing works for everybody — no support

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**Why:** It took the question to ask which statement is true. It chose option 1 with score 5, the only option with support. Its support: lesson 20, line 10: «We see a book because light from a lamp or the Sun bounces off it into our eyes.», reached through a sentence linked to the one the question matched. What matched: the same doer «light» (+3); the same place «eyes» (+3). Against it: a different action (counts against) (-1). · [the question and its options parsed, with trees and pragmatics](https://md.mova.elamur.ai/free/en/corpora/questions/physics/20-light-and-shadows/t1/)

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### Test 2 · right ✓ {#t2}

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A cartoon cat walks around a dark cellar and sees everything clearly. What is true?

- **1.** Cats make light with their eyes — no support
- **2.** Cats see by the heat of things — score 4
- **3.** Cats can see in complete darkness — score 4
- **4.** Cats see in dim light, but in total darkness nobody sees — **← Mova's choice** · **✓ the right answer** · score 8

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**Why:** It took the question to ask which statement is true. It chose option 4 with score 8, against 4 for the next best. Its support: lesson 20, line 14: «A cat's eyes shine in headlights because a mirror-like layer at the back of the eye bounces light back out, helping the cat see in dim light.», reached through the remembered sentence the question matched. What matched: the same place «dim light» (+4); the same action «see» (+3); the same doer «cat» (+1). · [the question and its options parsed, with trees and pragmatics](https://md.mova.elamur.ai/free/en/corpora/questions/physics/20-light-and-shadows/t2/)

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### Test 3 · wrong ✗ {#t3}

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What would happen if the Sun suddenly went out?

- **1.** It would stay light for ever — score 2
- **2.** We would not know for about eight minutes — **✓ the right answer** · no support
- **3.** It would be dark a year later — **← Mova's choice** · score 4
- **4.** It would be dark at once, with no delay of any kind — score 4

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**Why:** It took the question to ask what happens next. It chose option 3 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 20, line 4: «A low morning Sun stretches your shadow long across the playground, while the high Sun at midday shrinks it to a puddle at your feet.», reached through what followed the sentence the question matched. What matched: the same doer «high sun» (+4). The right option, 2, found no support in what it remembers. · [the question and its options parsed, with trees and pragmatics](https://md.mova.elamur.ai/free/en/corpora/questions/physics/20-light-and-shadows/t3/)

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### Test 4 · wrong ✗ {#t4}

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Under a blue lamp at a party, your red top looks almost black. Why?

- **1.** There is no red light for it to bounce — **✓ the right answer** · no support
- **2.** The top has gone cold — no support
- **3.** Blue light dyes the cloth black — **← Mova's choice** · score 2
- **4.** Your eyes stop working under blue light — no support

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**Why:** It took the question to ask why something happens (its cause). It chose option 3 with score 2, the only option with support. Its support: lesson 20, line 15: «A red apple looks red because it bounces red light and soaks up the other colours; under a blue lamp it looks almost black.», reached through the option's own match among the sentences about the question's things. What matched: the same property (+2); the same doer «light» (+1). Against it: a different action (counts against) (-1). The right option, 1, found no support in what it remembers. · [the question and its options parsed, with trees and pragmatics](https://md.mova.elamur.ai/free/en/corpora/questions/physics/20-light-and-shadows/t4/)

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### Test 5 · wrong ✗ {#t5}

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A star has blown up but you still see it shining tonight. How can that be?

- **1.** Stars never really blow up — **← Mova's choice** · no support
- **2.** Its old light is still on its way to us — **✓ the right answer** · no support
- **3.** Your eyes remember it from all the nights before — no support
- **4.** The Moon keeps the star alive — no support

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**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](https://md.mova.elamur.ai/free/en/corpora/questions/physics/20-light-and-shadows/t5/)

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### Test 6 · right ✓ {#t6}

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You stand in the playground at three times: 8 am, noon and 6 pm. When is your shadow longest?

- **1.** At noon, when the Sun is highest — score 1
- **2.** Shadows do not change through the day — no support
- **3.** It is the same at all three times — no support
- **4.** At 8 am or 6 pm, when the Sun is low — **← Mova's choice** · **✓ the right answer** · score 4

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**Why:** It took the question to ask which statement is true. It chose option 4 with score 4, against 1 for the next best. Its support: lesson 20, line 8: «Shadows are long when the Sun is low in the morning and evening and short when it is high at midday, and sundials used shadows to tell the time.», reached through the same lesson line as the sentence the question matched. What matched: the same doer «sun» (+2); the same property (+1); the same light verb (be, have, do, get, go) (+1). · [the question and its options parsed, with trees and pragmatics](https://md.mova.elamur.ai/free/en/corpora/questions/physics/20-light-and-shadows/t6/)

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### Test 7 · wrong ✗ {#t7}

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oi, what you wearing black for in this heat, you thick or what? What is the point he's making?

- **1.** Black makes the Sun shine harder and longer on you — **← Mova's choice** · no support
- **2.** Black soaks up sunlight and makes you hotter — **✓ the right answer** · no support
- **3.** Black cloth lets in more wind — no support
- **4.** Black cloth is heavier — no support

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**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](https://md.mova.elamur.ai/free/en/corpora/questions/physics/20-light-and-shadows/t7/)

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### Test 8 · right ✓ {#t8}

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A driver says a kid in dark clothes "came out of nowhere" at night. What would have helped?

- **1.** A reflective strip or bright vest — **← Mova's choice** · **✓ the right answer** · no support
- **2.** Walking along with no light at all — no support
- **3.** Wearing a big woolly hat pulled down low — no support
- **4.** A black coat and a pair of dark trousers — no support

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**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](https://md.mova.elamur.ai/free/en/corpora/questions/physics/20-light-and-shadows/t8/)

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### Test 9 · right ✓ {#t9}

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Which is true about light and shadow?

- **1.** A shadow can bend round corners — no support
- **2.** Shadows are made of dark gas — score 4
- **3.** A shadow has the outline of the thing that blocks the light — **← Mova's choice** · **✓ the right answer** · score 5
- **4.** Shadows are thicker on sunny days at noon — no support

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**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 20, line 3: «When something blocks the light, it leaves a dark patch behind it in its own outline: a shadow, like your hand rabbit on the bedroom wall.», reached through the option's own match among the sentences about the question's things. What matched: the same thing acted on «light» (+3); the same action «block» (+2). · [the question and its options parsed, with trees and pragmatics](https://md.mova.elamur.ai/free/en/corpora/questions/physics/20-light-and-shadows/t9/)

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### Test 10 · right ✓ {#t10}

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Why do we usually see an object best when a lamp is behind us shining onto it?

- **1.** The light pushes the object a little nearer to us — score 3
- **2.** More light bounces off it into our eyes — **← Mova's choice** · **✓ the right answer** · score 9
- **3.** The lamp heats it up so that it glows by itself — no support
- **4.** The lamp makes the pupils of our eyes much bigger — score 2

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**Why:** It took the question to ask why something happens (its cause). It chose option 2 with score 9, against 3 for the next best. Its support: lesson 20, line 10: «We see a book because light from a lamp or the Sun bounces off it into our eyes.», reached through the cause of the sentence the question matched. What matched: the same place «eyes» (+4); the same action «bounce off» (+3); the same doer «light» (+2). · [the question and its options parsed, with trees and pragmatics](https://md.mova.elamur.ai/free/en/corpora/questions/physics/20-light-and-shadows/t10/)

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### Exam question 1 · formal language · wrong ✗ {#e1}

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Identify the principal reason for which an opaque body casts a shadow.

- **1.** The body absorbs all heat from its surroundings — **← Mova's choice** · no support
- **2.** Light curves around the body — no support
- **3.** Light is propagated in straight lines and is obstructed by the body — **✓ the right answer** · no support
- **4.** The body emits darkness in the opposite direction — no support

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**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](https://md.mova.elamur.ai/free/en/corpora/questions/physics/20-light-and-shadows/e1/)

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### Exam question 2 · formal language · right ✓ {#e2}

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Which of the following statements most accurately characterises the perception of a non-luminous object?

- **1.** Light reflected from the object enters the eye — **← Mova's choice** · **✓ the right answer** · no support
- **2.** Rays emitted by the eye travel out and strike the object — no support
- **3.** The object is perceived by its warmth — no support
- **4.** The object emits light of its own — no support

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**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](https://md.mova.elamur.ai/free/en/corpora/questions/physics/20-light-and-shadows/e2/)

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### Exam question 3 · formal language · wrong ✗ {#e3}

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It is given that the light of the Sun requires approximately eight minutes to reach the Earth. Determine what may be inferred should the Sun cease to shine.

- **1.** Its extinction would be perceived instantaneously — **← Mova's choice** · no support
- **2.** Its extinction would not be perceived for approximately eight minutes — **✓ the right answer** · no support
- **3.** Its extinction could never be perceived — no support
- **4.** Its extinction would be perceived after eight days — no support

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**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](https://md.mova.elamur.ai/free/en/corpora/questions/physics/20-light-and-shadows/e3/)

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### Exam question 4 · formal language · wrong ✗ {#e4}

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Ascertain the reason for which a red apple presents a red appearance.

- **1.** It transmits all light without alteration — **← Mova's choice** · score 3
- **2.** It emits red light of its own — score 3
- **3.** It reflects light of the red colour and absorbs the remainder — **✓ the right answer** · score 3
- **4.** It absorbs light of the red colour and reflects the remainder — score 3

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**Why:** It took the question to ask which statement is true. It chose option 1 with score 3, tied with another option at 3 (the first shown, or the one claiming less beyond what it knows, wins). Its support: lesson 20, line 15: «A red apple looks red because it bounces red light and soaks up the other colours; under a blue lamp it looks almost black.», reached through the option's own match among the sentences about the question's things. What matched: the same thing acted on «red light» (+3); the same doer «apple» (+1). Against it: a different action (counts against) (-1). The right option, 3, scored 3. · [the question and its options parsed, with trees and pragmatics](https://md.mova.elamur.ai/free/en/corpora/questions/physics/20-light-and-shadows/e4/)

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- ← previous: [19. Bangs and loud sounds: firecrackers and ears](https://md.mova.elamur.ai/free/en/school-run/physics/19-bangs-and-loud-sounds-firecrackers-and-ears/)
- next →: [21. Mirrors, rainbows and the blue sky](https://md.mova.elamur.ai/free/en/school-run/physics/21-mirrors-rainbows-and-the-blue-sky/)
- ↑ back to [Physics](https://md.mova.elamur.ai/free/en/school-run/physics/)