---
title: Day and night, and the Moon's faces — how Mova does on the tests · Physics
description: Lesson 39 of the physics course of Mova's primary school: 4 of 11 tests right, exam 3 of 4, every question with the options, the student's choice, the right answer and why it chose.
---

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# Day and night, and the Moon's faces

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**Tests:** 4 of 11 right · **Exam:** 3 of 4 right · **Kind:** plain · **Understood:** 8 of 15 · **Run:** 2026-10-18, commit `f3c23ea72`

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Lesson 39 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/39-day-and-night-and-the-moons-faces/).

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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/39-day-and-night-and-the-moons-faces/).

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### Test 1 · right ✓ {#t1}

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my bro says the Sun goes round us, look it moves across the sky innit. right?

- **1.** Yes, the Sun goes round us once every day, east to west — score 2
- **2.** No, the Sun stays still and the sky moves — no support
- **3.** Yes, but only in summer — no support
- **4.** No, the Earth spins, so the Sun only seems to move — **← Mova's choice** · **✓ the right answer** · score 9

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**Why:** It took the question to ask which statement is true. It chose option 4 with score 9, against 2 for the next best. Its support: lesson 39, line 6: «The Earth spins towards the east, so the Sun seems to rise in the east and set in the west; careful watching proved it is the Earth that turns.», reached through the option's own match among the sentences about the question's things. What matched: the same action «seem» (+4); the same doer «sun» (+3); its «because» matches the remembered cause (+2). · [the question and its options parsed, with trees and pragmatics](https://md.mova.elamur.ai/free/en/corpora/questions/physics/39-day-and-night-and-the-moons-faces/t1/)

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### Test 2 · wrong ✗ {#t2}

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"The dark side of the Moon is always in darkness," says a band poster. Put it right.

- **1.** The far side gets as much sunlight as the near side — **✓ the right answer** · no support
- **2.** It is right, that side never gets any sunlight at all — score 5
- **3.** The Moon has no far side — **← Mova's choice** · score 7
- **4.** It is lit only by the Earth — no support

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**Why:** It took the question to ask which statement is true. It chose option 3 with score 7, against 5 for the next best. Its support: lesson 10, line 16: «In Newton's cradle, swing one ball in and one flies out the other side, swing two in and two fly out, because the knock passes through the still balls.», reached through the option's own match among the sentences about the question's things. What matched: the same thing acted on «other side» (+4); the same doer «one» (+3). 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/39-day-and-night-and-the-moons-faces/t2/)

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### Test 3 · wrong ✗ {#t3}

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Granny on the phone from Sydney says "good morning" as you go to bed. How can that be?

- **1.** Australia has two suns — **← Mova's choice** · no support
- **2.** The Sun goes to Sydney first every day — no support
- **3.** Sydney is on the side of the Earth now turning to face the Sun — **✓ the right answer** · no support
- **4.** She is confused about the time — 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/39-day-and-night-and-the-moons-faces/t3/)

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### Test 4 · right ✓ {#t4}

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You are on a plane flying very smoothly and your juice does not spill. How is this like the spinning Earth?

- **1.** The plane is not really moving, it only seems to be moving — no support
- **2.** Smooth motion cannot be felt, only bumps and changes — **← Mova's choice** · **✓ the right answer** · score 3
- **3.** Planes and the Earth both stand still — no support
- **4.** Juice is too heavy to move — no support

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**Why:** It took the question to ask what something is like. It chose option 2 with score 3, the only option with support. Its support: lesson 39, line 3: «We do not feel the spin because it is perfectly smooth; you only feel motion when it speeds up, slows down or jolts.», reached through the option's own match among the sentences about the question's things. What matched: the same action «feel» (+3); the same thing acted on «motion» (+3). Against it: one says «not», the other does not (counts against) (-3). · [the question and its options parsed, with trees and pragmatics](https://md.mova.elamur.ai/free/en/corpora/questions/physics/39-day-and-night-and-the-moons-faces/t4/)

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### Test 5 · right ✓ {#t5}

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tbh I saw the Moon at like 10 in the morning, is something broken lol?

- **1.** No, that was the Sun shining dimly through haze — no support
- **2.** No, the Moon is often up in the daytime — **← Mova's choice** · **✓ the right answer** · score 4
- **3.** Yes, the Moon only ever comes out at night — no support
- **4.** Yes, that was just a pale round cloud, not the Moon — no support

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**Why:** It took the question to ask which statement is true. It chose option 2 with score 4, the only option with support. Its support: lesson 39, line 16: «The Moon is often in the sky in daytime and is bright enough to see; the stars are there too, but the bright sky hides them.», reached through the option's own match among the sentences about the question's things. What matched: the same doer «moon» (+3); 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/39-day-and-night-and-the-moons-faces/t5/)

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### Test 6 · wrong ✗ {#t6}

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In a cartoon, a crescent Moon has a star shining inside its dark part. What's wrong?

- **1.** The Moon has a hole in it — **← Mova's choice** · no support
- **2.** Nothing, stars are closer than the Moon — no support
- **3.** The crescent should be blue — no support
- **4.** The dark part is still the Moon, so it would hide any star behind it — **✓ the right answer** · 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/39-day-and-night-and-the-moons-faces/t6/)

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### Test 7 · wrong ✗ {#t7}

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Leo wants to watch a solar eclipse with sunglasses. What should he do?

- **1.** Sunglasses are fine if he squints and only looks for a minute — **← Mova's choice** · no support
- **2.** Look through binoculars instead — no support
- **3.** Look quickly, a few seconds is safe — no support
- **4.** Use special eclipse glasses only; sunglasses are not safe — **✓ the right answer** · 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/39-day-and-night-and-the-moons-faces/t7/)

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### Test 8 · wrong ✗ {#t8}

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What would happen to the Moon's face as seen from Earth if the Moon stopped spinning?

- **1.** We would still see only the very same one face — score 8
- **2.** The Moon would stop and fall down to the Earth — **← Mova's choice** · score 9
- **3.** The Moon would go completely dark and disappear — no support
- **4.** Over each month we would see all sides of it — **✓ the right answer** · no support

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**Why:** It took the question to ask which statement is true. It chose option 2 with score 9, against 8 for the next best. Its support: lesson 2, line 6: «The Moon is falling towards the Earth all the time, but its sideways speed carries it past, so its path bends round the Earth.», reached through the option's own match among the sentences about the question's things. What matched: the same action «fall» (+4); the same doer «moon» (+3); the same circumstance (+2). The right option, 4, 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/39-day-and-night-and-the-moons-faces/t8/)

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### Test 9 · wrong ✗ {#t9}

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The Moon is full tonight and looks orange-red at one point during an eclipse. What is shining on it?

- **1.** Sunlight bent through the Earth's air, like sunsets — **✓ the right answer** · no support
- **2.** Reddish light reflected onto it from the planet Mars — **← Mova's choice** · score 4
- **3.** Light from all the big cities on the night side of Earth — score 4
- **4.** Red lava glowing from old volcanoes on the Moon's surface — no support

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**Why:** It took the question to ask who or what does it. 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 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 a sentence linked to the one the question matched. What matched: it fills the role the question asks for (+3); the same doer «light» (+2). 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/39-day-and-night-and-the-moons-faces/t9/)

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### Test 10 · wrong ✗ {#t10}

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Why can the Sun and the Moon look the same size in the sky?

- **1.** The air makes them look the same — score 4
- **2.** The Sun is much bigger but also much further away — **✓ the right answer** · score 4
- **3.** The Moon is bigger than the Sun — **← Mova's choice** · score 5
- **4.** They really are exactly the same size, just in different places — score 4

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**Why:** It took the question to ask why something happens (its cause). It chose option 3 with score 5, against 4 for the next best. Its support: lesson 39, line 13: «In an eclipse of the Sun the Moon passes exactly between the Sun and the Earth; the Sun is about 400 times wider than the Moon but also about 400 times further…», reached through the same lesson line as the sentence the question matched. What matched: the same doer «moon» (+3); the same circumstance (+2). The right option, 2, scored 4. · [the question and its options parsed, with trees and pragmatics](https://md.mova.elamur.ai/free/en/corpora/questions/physics/39-day-and-night-and-the-moons-faces/t10/)

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### Test 11 · right ✓ {#t11}

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A camera points at the North Star all night with the shutter open. What does the picture show?

- **1.** Circles of starlight round the North Star — **← Mova's choice** · **✓ the right answer** · no support
- **2.** A single still dot for each and every star — no support
- **3.** The stars all falling slowly down to the ground — no support
- **4.** A black sky with nothing in it at all, all night — 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/39-day-and-night-and-the-moons-faces/t11/)

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### Exam question 1 · formal language · right ✓ {#e1}

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Identify the cause of the apparent passage of the Sun across the sky from east to west.

- **1.** The pull of the Moon upon the Sun — no support
- **2.** The rotation of the Earth towards the east — **← Mova's choice** · **✓ the right answer** · score 4
- **3.** The motion of the clouds from east to west — no support
- **4.** The revolution of the Sun about the Earth — no support

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**Why:** It took the question to ask which statement is true. It chose option 2 with score 4, the only option with support. Its support: lesson 39, line 6: «The Earth spins towards the east, so the Sun seems to rise in the east and set in the west; careful watching proved it is the Earth that turns.», reached through the option's own match among the sentences about the question's things. What matched: the same doer «sun» (+3); the same circumstance (+2). 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/39-day-and-night-and-the-moons-faces/e1/)

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

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Ascertain the reason for which the same hemisphere of the Moon is perpetually presented to the Earth.

- **1.** The Moon rotates once upon its axis in each revolution about the Earth — **← Mova's choice** · **✓ the right answer** · no support
- **2.** The opposite hemisphere is permanently unlit — no support
- **3.** The Moon does not rotate upon its axis at all — no support
- **4.** The Earth obscures the opposite hemisphere — 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/39-day-and-night-and-the-moons-faces/e2/)

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

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Which of the following statements most accurately characterises the phases of the Moon?

- **1.** The Moon emits varying quantities of its own light — **← Mova's choice** · no support
- **2.** Varying portions of its sunlit half are visible as it orbits the Earth — **✓ the right answer** · no support
- **3.** The Moon alters in actual size through the month — no support
- **4.** The Earth's shadow obscures varying portions of it each night — 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/39-day-and-night-and-the-moons-faces/e3/)

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### Exam question 4 · formal language · right ✓ {#e4}

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Select the response consistent with the established facts concerning the observation of a solar eclipse.

- **1.** It must never be viewed save through special eclipse glasses — **← Mova's choice** · **✓ the right answer** · no support
- **2.** It may be viewed safely through binoculars — no support
- **3.** It may be viewed directly provided the duration of viewing is brief — no support
- **4.** It may be viewed safely through ordinary sunglasses — 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/39-day-and-night-and-the-moons-faces/e4/)

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- ← previous: [38. Rockets, record speeds and motion everywhere](https://md.mova.elamur.ai/free/en/school-run/physics/38-rockets-record-speeds-and-motion-everywhere/)
- next →: [40. Seasons and tides](https://md.mova.elamur.ai/free/en/school-run/physics/40-seasons-and-tides/)
- ↑ back to [Physics](https://md.mova.elamur.ai/free/en/school-run/physics/)