Heating, water pipes and drains

Tests: 6 of 11 right · Exam: 1 of 4 right · Kind: ★★ · Understood: 11 of 15 · Run: 2026-10-18, commit f3c23ea72

Lesson 13 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 ✓

dad cranked the thermostat to 30 so it heats faster. does it?

1. No, it heats at the same speed, just to a hotter end — ← Mova's choice · ✓ the right answer · no support
2. Yes, twice as fast — no support
3. No, it makes the house colder — no support
4. Yes, the boiler burns double gas — 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 2 · ★★ · right ✓

Ruby reckons radiators sit under windows for no reason. What is a good reason?

1. Radiators like the light — no support
2. It is the only place pipes fit — no support
3. So you can dry your socks in the sun that comes through the glass — no support
4. Warm air rising there meets the cold air from the window — ← Mova's choice · ✓ the right answer · score 6

Why: It took the question to ask which statement is true. It chose option 4 with score 6, the only option with support. Its support: lesson 13, line 9: «A radiator warms the air next to it, which rises and moves round the room; it heats the room more by moving warm air than by glowing heat; radiators often sit…», reached through a sentence linked to the one the question matched. What matched: the same action «meet» (+2); the same doer «rising warm air» (+2); the same thing acted on «cold air» (+2). · the question and its options parsed, with trees and pragmatics

Test 3 · ★★ · wrong ✗

bloody hell, water's pouring through the ceiling! what do we do first?

1. Switch the lights on to see better — ← Mova's choice · no support
2. Put your hand over the hole — no support
3. An adult turns off the stopcock, and keep away from electrics — ✓ the right answer · no support
4. Turn on every tap in the house — 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 4 · ★★ · wrong ✗

What would happen if there were no U-bend under the sink?

1. Smells from the drain would come up into the kitchen — ✓ the right answer · no support
2. The water would come out hot — ← Mova's choice · score 2
3. The sink would never empty, and the water would just sit there — score 2
4. The tap would stop working — score 2

Why: It took the question to ask what happens next. It chose option 2 with score 2, tied with another option at 2 (the first shown, or the one claiming less beyond what it knows, wins). Its support: lesson 13, line 13: «Under a sink, a U-bend holds a little water that blocks smells from the drain coming back up.», reached through what followed the sentence the question matched. What matched: the same doer «little water» (+4). Against it: a different action (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 5 · ★★ · wrong ✗

My brother flushes wet wipes because the packet says flushable. Is it a good idea?

1. Yes, they melt away in the water like toilet paper — ← Mova's choice · score 1
2. No, wipes help block pipes and make fatbergs — ✓ the right answer · no support
3. Yes, they turn into soft paper as soon as they're wet — no support
4. No, only because they float back up into the bowl — no support

Why: It took the question to ask which statement is true. It chose option 1 with score 1, the only option with support. Its support: lesson 13, line 19: «Only pee, poo and toilet paper should be flushed, and you keep away from sewers, treatment tanks and any water leaking near electrics.», reached through the same lesson line as the sentence the question matched. What matched: the same place «sewers» (+2); the same property (+1). Against it: a different action (counts against) (-1); a different doer (counts against) (-1). The right option, 2, found no support in what it remembers. · the question and its options parsed, with trees and pragmatics

Test 6 · ★★ · right ✓

Which is true about the water you flush away?

1. It goes to a sewage works, is cleaned and goes back to rivers — ← Mova's choice · ✓ the right answer · score 6
2. It is pumped straight back into your own tap the very next morning — no support
3. It stays under your garden for ever — no support
4. It goes straight into the sea untreated — no support

Why: It took the question to ask which statement is true. It chose option 1 with score 6, the only option with support. Its support: lesson 13, line 16: «At a sewage works, waste water is screened, settled in tanks and cleaned by helpful bacteria before the clean water goes back to rivers, and the sludge can be…», reached through the option's own match among the sentences about the question's things. What matched: the same action «go back» (+2); the same doer «clean water» (+2); the same circumstance (+2). · the question and its options parsed, with trees and pragmatics

Test 7 · ★★ · right ✓

A new boiler drips water from a pipe outside on cold days. Is it broken?

1. Not necessarily; condensing boilers drip water from their steam — ← Mova's choice · ✓ the right answer · score 6
2. Yes, it must be switched off at once — no support
3. Yes, the water is leaking gas — score 4
4. No, it is rain caught in the pipe — no support

Why: It took the question to ask which statement is true. It chose option 1 with score 6, against 4 for the next best. Its support: lesson 10, line 17: «Air conditioners drip water outside because cooling the air turns some of its water vapour (water as an invisible gas in the air) into droplets.», reached through the remembered sentence the question matched. What matched: the same action «drip» (+4); the same thing acted on «water» (+4). Against it: a different doer (counts against) (-2). · the question and its options parsed, with trees and pragmatics

Test 8 · ★★ · wrong ✗

mate says the cold tap water comes straight from the river, no cleaning. true?

1. Yes, the pipe goes straight to the river with nothing in between — no support
2. No, it comes from the sea — ← Mova's choice · score 8
3. Yes, rivers are perfectly clean — no support
4. No, it is filtered and treated before it reaches us — ✓ the right answer · score 4

Why: It took the question to ask which statement is true. It chose option 2 with score 8, against 4 for the next best. Its support: lesson 13, line 1: «Behind the walls and under the floor of every home runs a hidden river system: clean water comes in through one set of pipes, and used water leaves through ano…», reached through the remembered sentence the question matched. What matched: the same action «come in» (+4); the same doer «clean water» (+4). The right option, 4, scored 4. · the question and its options parsed, with trees and pragmatics

Test 9 · ★★ · right ✓

Your little sister is running a bath with only the hot tap. Best advice?

1. Run the cold first and test with your elbow — ← Mova's choice · ✓ the right answer · score 5
2. Jump in quickly before the hot water cools down — no support
3. It's fine, hot water from a tap can never scald you — score 1
4. Test it with the tips of your toes, they feel heat best — no support

Why: It took the question to ask which statement is true. It chose option 1 with score 5, against 1 for the next best. Its support: lesson 13, line 12: «Stored hot water is kept at about 60 degrees to stop germs growing in the tank; run the cold first in a bath and test it with your elbow, because hot water can…», reached through the same lesson line as the sentence the question matched. What matched: the same action «run» (+2); the same thing acted on «cold» (+2); the same property (+1). · the question and its options parsed, with trees and pragmatics

Test 10 · ★★ · wrong ✗

What can a sewage works make from its leftover sludge?

1. Drinking water for houses — ← Mova's choice · score 4
2. Paper for schools — no support
3. Salt for roads — no support
4. Gas for energy — ✓ the right answer · score 0

Why: It took the question to ask what it is done to. It chose option 1 with score 4, against 0 for the next best. Its support: lesson 11, line 2: «They do it in different ways: the oven heats the air in a box, the toaster makes thin wires glow red, the kettle has a hot metal element sitting in the water,…», reached through the remembered sentence the question matched. What matched: it fills the role the question asks for (+5); the same thing acted on «water» (+3). Against it: a different action (counts against) (-2); a different doer (counts against) (-2). The right option, 4, scored 0. · the question and its options parsed, with trees and pragmatics

Test 11 · ★★ · right ✓

Why does a house in a freezing winter need pipes in the loft wrapped?

1. Lagging stops the water in them freezing and bursting the pipe — ← Mova's choice · ✓ the right answer · score 5
2. It keeps the water cold in summer — no support
3. It keeps the pipes from getting dusty — no support
4. It stops the boiler going out — no support

Why: It took the question to ask why something happens (its cause). It chose option 1 with score 5, the only option with support. Its support: lesson 13, line 18: «Water expands when it freezes, which can split a pipe; when it thaws, water pours out, so pipes in lofts are wrapped in foam lagging.», reached through the same lesson line as the sentence the question matched. What matched: the same action «split» (+3); the same thing acted on «pipe» (+2). · the question and its options parsed, with trees and pragmatics

Exam question 1 · formal language · wrong ✗

Identify the principal reason for which a U-shaped bend is installed beneath a sink.

1. It filters drinking water before use — ← Mova's choice · score 6
2. It retains water which prevents the ingress of foul odours — ✓ the right answer · score 6
3. It heats water prior to its discharge — score 6
4. It accelerates the drainage of waste water into the sewer below — no support

Why: It took the question to ask which statement is true. It chose option 1 with score 6, tied with another option at 6 (the first shown, or the one claiming less beyond what it knows, wins). Its support: lesson 13, line 13: «Under a sink, a U-bend holds a little water that blocks smells from the drain coming back up.», reached through the remembered sentence the question matched. What matched: the same doer «u bend» (+4); the same thing acted on «little water» (+4). Against it: a different action (counts against) (-2). The right option, 2, scored 6. · the question and its options parsed, with trees and pragmatics

Exam question 2 · formal language · right ✓

It is given that the wall thermostat of a dwelling is raised from 20 to 30 degrees. Ascertain the effect upon the rate at which the dwelling is heated.

1. The rate is unchanged; only the final temperature is higher — ← Mova's choice · ✓ the right answer · no support
2. The rate of heating is reduced by one half — no support
3. The dwelling ceases to be heated — no support
4. The rate of heating is doubled — 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 ✗

Which of the following statements most accurately characterises the consequence of water freezing within a domestic pipe?

1. Contraction of the ice draws the pipe inwards — no support
2. Expansion of the ice may fracture the pipe — ✓ the right answer · no support
3. The pipe becomes permanently magnetised — score 5
4. The water boils and escapes as vapour — ← Mova's choice · score 7

Why: It took the question to ask who or what does it. It chose option 4 with score 7, against 5 for the next best. Its support: lesson 13, line 12: «Stored hot water is kept at about 60 degrees to stop germs growing in the tank; run the cold first in a bath and test it with your elbow, because hot water can…», 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 «cooled water» (+3). The right option, 2, found no support in what it remembers. · the question and its options parsed, with trees and pragmatics

Exam question 4 · formal language · wrong ✗

Select the response consistent with the established facts concerning the disposal of cooking fat via the kitchen sink.

1. It is harmless and recommended practice — ← Mova's choice · no support
2. It is required for the cleaning of drains — no support
3. It solidifies and contributes to blockages of sewers — ✓ the right answer · no support
4. It is fully dissolved by tap water and is carried safely away — 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

This page in Markdown → https://md.mova.elamur.ai/free/en/school-run/technology/13-heating-water-pipes-and-drains/