---
title: Evaporation and condensation — how Mova does on the tests · World
description: Lesson 13 of the world course of Mova's primary school: 8 of 13 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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# Evaporation and condensation

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**Tests:** 8 of 13 right · **Exam:** 1 of 4 right · **Kind:** ★ · **Understood:** 3 of 17 · **Run:** 2026-10-18, commit `f3c23ea72`

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Lesson 13 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](https://md.mova.elamur.ai/free/en/corpora/school/world/13-evaporation-condensation/).

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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/world/13-evaporation-condensation/).

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### Test 1 · ★ · right ✓ {#t1}

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Two equal saucers of water are left out: one on a warm sunny windowsill, one in a cool cupboard. What happens?

- **1.** The one in the window dries first, because warmth speeds evaporation — **← Mova's choice** · **✓ the right answer** · no support
- **2.** The one in the cupboard dries first, because darkness draws water out — no support
- **3.** Neither dries, because water only leaves when it boils — no support
- **4.** Both dry at the same time, because they hold the same water — no support

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**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](https://md.mova.elamur.ai/free/en/corpora/questions/world/13-evaporation-condensation/t1/)

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### Test 2 · ★ · wrong ✗ {#t2}

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Why does breathing on a cold window make a foggy patch?

- **1.** Your breath carries dust that sticks to the glass — **← Mova's choice** · no support
- **2.** Your breath turns into ice crystals at once — no support
- **3.** Carbon dioxide turns white on the glass — no support
- **4.** The vapour in your breath condenses on the cold glass — **✓ 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/world/13-evaporation-condensation/t2/)

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### Test 3 · ★ · wrong ✗ {#t3}

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A dog pants with its tongue out on a hot day. How does this help it?

- **1.** It slows its heart down — **← Mova's choice** · no support
- **2.** It swallows cool air into its stomach — no support
- **3.** Water evaporating from its tongue cools it — **✓ the right answer** · no support
- **4.** It breathes out its heat as smoke — 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/world/13-evaporation-condensation/t3/)

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### Test 4 · ★ · right ✓ {#t4}

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Which is true?

- **1.** Water can evaporate even from a cold puddle — **← Mova's choice** · **✓ the right answer** · no support
- **2.** Water can only evaporate in sunlight — no support
- **3.** Water can only evaporate when it boils — no support
- **4.** Evaporation makes the water left behind warmer — no support

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**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](https://md.mova.elamur.ai/free/en/corpora/questions/world/13-evaporation-condensation/t4/)

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### Test 5 · ★ · wrong ✗ {#t5}

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A lid is put on a pot of hot soup. Later drops of water hang under the lid. Where did they come from?

- **1.** The lid was still wet from washing — **← Mova's choice** · no support
- **2.** Vapour from the soup condensed on the cooler lid — **✓ the right answer** · no support
- **3.** Water came through the metal from outside — no support
- **4.** The kitchen air made a little rain right under the lid — no support

<!-- .why -->
**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/world/13-evaporation-condensation/t5/)

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### Test 6 · ★ · right ✓ {#t6}

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Which of these shows condensation?

- **1.** Drops forming on a cold bottle just out of the fridge — **← Mova's choice** · **✓ the right answer** · no support
- **2.** Ice melting in a drink — no support
- **3.** Sugar disappearing in tea — no support
- **4.** A puddle drying in the sunshine — 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/world/13-evaporation-condensation/t6/)

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### Test 7 · ★ · right ✓ {#t7}

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Why does a swimmer feel cold climbing out of the pool on a windy day?

- **1.** Wind speeds up the evaporation that cools the skin — **← Mova's choice** · **✓ the right answer** · no support
- **2.** The pool water is colder than the air — no support
- **3.** Wind blows cold drops of rain onto the swimmer's skin — no support
- **4.** Wet skin cannot make any heat — 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/world/13-evaporation-condensation/t7/)

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### Test 8 · ★ · wrong ✗ {#t8}

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A wet floor dries faster after it is mopped thin than when it is left in puddles. Why?

- **1.** The mop soaks up every drop — **← Mova's choice** · no support
- **2.** Puddles are made of heavier water — no support
- **3.** Mopping makes the water colder — no support
- **4.** A thin layer has a bigger surface for evaporation — **✓ 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/world/13-evaporation-condensation/t8/)

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### Test 9 · ★ · right ✓ {#t9}

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What is fog?

- **1.** Tiny drops of water formed when vapour cools near the ground — **← Mova's choice** · **✓ the right answer** · no support
- **2.** A cloud of smoke from chimneys — no support
- **3.** Dust lifted by the wind — no support
- **4.** Pure water vapour gas — no support

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**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](https://md.mova.elamur.ai/free/en/corpora/questions/world/13-evaporation-condensation/t9/)

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### Test 10 · ★ · wrong ✗ {#t10}

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how come the puddle's gone after it got sunny

- **1.** It soaked into the Sun's rays — **← Mova's choice** · no support
- **2.** It froze and blew away — no support
- **3.** The ground drank it up and stays wet — no support
- **4.** The water evaporated into the air — **✓ the right answer** · no support

<!-- .why -->
**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/world/13-evaporation-condensation/t10/)

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### Test 11 · ★ · right ✓ {#t11}

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wots that white steam from the kettle actually

- **1.** Tiny drops of water from cooled vapour — **← Mova's choice** · **✓ the right answer** · no support
- **2.** Pure invisible water vapour, nothing else — no support
- **3.** Air that's been boiled till it goes white — no support
- **4.** Smoke coming off the hot metal of the kettle — no support

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**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](https://md.mova.elamur.ai/free/en/corpora/questions/world/13-evaporation-condensation/t11/)

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### Test 12 · ★ · right ✓ {#t12}

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Leo says sweat is just the body getting rid of water and doesn't cool u at all. true?

- **1.** Yes, sweat makes you warmer — no support
- **2.** No, sweat only cools you down when it's cold outside — score 6
- **3.** No, sweat cools you as it evaporates from your skin — **← Mova's choice** · **✓ the right answer** · score 10
- **4.** Yes, sweat has nothing to do with cooling — no support

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**Why:** It took the question to ask which statement is true. It chose option 3 with score 10, against 6 for the next best. Its support: lesson 13, line 12: «Sweat cools our body as it evaporates from the skin.», reached through the remembered sentence the question matched. What matched: the same action «cool» (+4); the same doer «sweat» (+4); its «because» matches the remembered cause (+4). Against it: a different thing acted on (counts against) (-2). · [the question and its options parsed, with trees and pragmatics](https://md.mova.elamur.ai/free/en/corpora/questions/world/13-evaporation-condensation/t12/)

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### Test 13 · ★ · right ✓ {#t13}

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Tom reckons the water on the grass in the morning is rain from the night. right?

- **1.** No, it's dew, vapour that condensed on the cool grass — **← Mova's choice** · **✓ the right answer** · score 12
- **2.** Yes, it falls from the clouds as tiny drops — no support
- **3.** No, it comes up out of the soil — no support
- **4.** Yes, it always rains a little at night — no support

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**Why:** It took the question to ask which statement is true. It chose option 1 with score 12, the only option with support. Its support: lesson 13, line 11: «Dew forms when water vapour in the air condenses on cool grass at night.», reached through the remembered sentence the question matched. What matched: the same action «condense» (+4); the same doer «water vapour» (+4); the same place «cool grass» (+4). · [the question and its options parsed, with trees and pragmatics](https://md.mova.elamur.ai/free/en/corpora/questions/world/13-evaporation-condensation/t13/)

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

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Which of the following statements most accurately characterises evaporation?

- **1.** A liquid becomes a gas solely upon reaching the boiling point, never below it — **← Mova's choice** · score 3
- **2.** A liquid becomes a gas at its surface below the boiling point — **✓ the right answer** · score 3
- **3.** A solid becomes a liquid upon heating — no support
- **4.** A gas becomes a liquid upon cooling — no support

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**Why:** It took the question to ask who or what does it. 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 13, line 1: «Water does not need to boil to become a gas: at any temperature some particles at the surface move fast enough to escape into the air. This is evaporation.», reached through the same lesson line as the sentence the question matched. What matched: the same action «become» (+2); the same thing acted on «gas» (+2). Against it: a different doer (counts against) (-1). The right option, 2, scored 3. · [the question and its options parsed, with trees and pragmatics](https://md.mova.elamur.ai/free/en/corpora/questions/world/13-evaporation-condensation/e1/)

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

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Select the response that is consistent with the established facts concerning the white cloud issuing from a kettle.

- **1.** It consists of minute drops of liquid water — **← Mova's choice** · **✓ the right answer** · no support
- **2.** It consists of smoke from the heating element — no support
- **3.** It consists of air expelled from the water — no support
- **4.** It consists of invisible water vapour — 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/world/13-evaporation-condensation/e2/)

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

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Identify the principal reason for which perspiration cools the human body.

- **1.** It is itself colder than the surrounding air — **← Mova's choice** · no support
- **2.** Its evaporation removes heat from the skin — **✓ the right answer** · no support
- **3.** It prevents blood from reaching the skin — no support
- **4.** It reflects the heat of the Sun — 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/world/13-evaporation-condensation/e3/)

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

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It is given that a dish of salt water is permitted to evaporate entirely. Ascertain what remains.

- **1.** A diminished quantity of salt water — **← Mova's choice** · no support
- **2.** The water alone — no support
- **3.** The salt alone — **✓ the right answer** · no support
- **4.** Nothing whatsoever — 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/world/13-evaporation-condensation/e4/)

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<!-- pn -->
- ← previous: [12. Melting, freezing and boiling](https://md.mova.elamur.ai/free/en/school-run/world/12-melting-freezing-boiling/)
- next →: [14. The water cycle](https://md.mova.elamur.ai/free/en/school-run/world/14-the-water-cycle/)
- ↑ back to [World](https://md.mova.elamur.ai/free/en/school-run/world/)