Car safety: brakes, seat belts and airbags

Tests: 7 of 11 right · Exam: 2 of 4 right · Kind: ★ · Understood: 11 of 15 · Run: 2026-10-18, commit f3c23ea72

Lesson 18 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 · ★ · wrong ✗

ugh do I need the belt, it's only to the shop round the corner?

1. Only if it's raining and the road is wet — ← Mova's choice · no support
2. No, only on long motorway trips — no support
3. Yes, every trip, in every seat — ✓ the right answer · no support
4. No, only grown-ups need one in a car — 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 ✓

My brother tucks the belt under his arm cos it's itchy on his neck. What's right?

1. He should put it round his soft tummy instead, under his jumper, so it doesn't rub — no support
2. He needs a booster so the belt sits on his chest and hips — ← Mova's choice · ✓ the right answer · score 12
3. That is the safest way to wear it — no support
4. It doesn't matter where it goes — no support

Why: It took the question to ask which statement is true. It chose option 2 with score 12, the only option with support. Its support: lesson 8, line 12: «Crash tests are why every seat has a belt and children need the right car seat or booster for their size, so the belt sits across them safely.», reached through the remembered sentence the question matched. What matched: the same action «sit» (+4); the same doer «belt» (+4); its «because» matches the remembered cause (+4). · the question and its options parsed, with trees and pragmatics

Test 3 · ★ · right ✓

What would happen to an unbelted passenger if the car stopped suddenly?

1. They would keep going forward and hit the inside of the car — ← Mova's choice · ✓ the right answer · score 4
2. Nothing, cars stop gently — score 4
3. They would stop at exactly the same moment as the car, safe in the seat — score 4
4. They would be pushed back into the seat — score 2

Why: It took the question to ask what happens next. It chose option 1 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 18, line 2: «If a car does stop suddenly in a crash, everything inside that is not held keeps going forward at the same speed, including people, which is why seat belts mat…», reached through what followed the sentence the question matched. What matched: the same action «keep» (+4). · the question and its options parsed, with trees and pragmatics

Test 4 · ★ · wrong ✗

A baby seat facing backwards is put in the front seat with the airbag on. Is it safe?

1. Yes, the airbag will protect the baby — no support
2. Yes, the front seat is the safest — no support
3. No, a rear-facing baby seat never goes in front of an active airbag — ✓ the right answer · score 3
4. No, babies must face forwards — ← Mova's choice · score 8

Why: It took the question to ask which statement is true. It chose option 4 with score 8, against 3 for the next best. Its support: lesson 18, line 14: «Babies ride facing backwards because their necks are weak.», reached through the remembered sentence the question matched. What matched: the same action «face» (+4); the same doer «babies» (+4). The right option, 3, scored 3. · the question and its options parsed, with trees and pragmatics

Test 5 · ★ · wrong ✗

In a cartoon a car stops dead from full speed in a second at a puddle. What's wrong?

1. Wet roads make cars stop sooner, because the water acts like glue on the tyres — ← Mova's choice · score 8
2. Puddles make brakes stronger — no support
3. Nothing, cars stop instantly in water — score 8
4. Cars need several car-lengths to stop, longer when wet — ✓ the right answer · score 8

Why: It took the question to ask which statement is true. 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 17, line 18: «The grooves in a tyre's tread push water away so the rubber can grip; the UK minimum tread depth for cars is 1.6 millimetres, and on wet roads cars need much l…», reached through the remembered sentence the question matched. What matched: the same action «stop» (+4); the same doer «cars» (+4). The right option, 4, scored 8. · the question and its options parsed, with trees and pragmatics

Test 6 · ★ · right ✓

Ted's playing hide and seek behind a parked car. What's the rule?

1. It's fine if the car is small — no support
2. It's fine if you crouch down low — no support
3. Never play behind or near parked cars — ← Mova's choice · ✓ the right answer · score 0
4. It's fine if the engine is off for a minute — no support

Why: It took the question to ask what it is done to. It chose option 3 with score 0, the only option with support. Its support: lesson 17, line 15: «Mechanics lift cars on ramps, plug in computers to read faults and replace worn parts; nobody goes under a raised car except the mechanic doing the job safely.», reached through the same lesson line as the sentence the question matched. What matched: it fills the role the question asks for (+2); the same thing acted on «cars» (+1). Against it: a different doer (counts against) (-1); a different action (counts against) (-2). · the question and its options parsed, with trees and pragmatics

Test 7 · ★ · wrong ✗

mate says a crumpled car after a crash means it was badly made. true?

1. No, crumpled cars are always made of paper — ← Mova's choice · score 8
2. Not necessarily; crumpling often means it did its job — ✓ the right answer · no support
3. Yes, crumpling hurts the people inside more than a stiff car would — no support
4. Yes, good cars never dent — no support

Why: It took the question to ask which statement is true. It chose option 1 with score 8, the only option with support. Its support: lesson 18, line 3: «Modern cars are built to protect the people inside: the belt holds you, the airbag cushions the head, and the front of the car crumples on purpose to slow ever…», reached through the remembered sentence the question matched. What matched: the same action «build» (+4); the same thing acted on «modern cars» (+4). The right option, 2, found no support in what it remembers. · the question and its options parsed, with trees and pragmatics

Test 8 · ★ · right ✓

The parking sensor isn't beeping, so there's no one behind the car. Right?

1. Yes, the sensor never misses anything, even a small child or a cat — no support
2. Yes, if the screen is dark — no support
3. No, sensors don't see everything; still stay clear — ← Mova's choice · ✓ the right answer · score 6
4. No, the sensor only sees walls — score 0

Why: It took the question to ask which statement is true. It chose option 3 with score 6, against 0 for the next best. Its support: lesson 18, line 17: «Parking sensors send out sound pulses and time the echo, beeping faster as the car gets closer to something, a bit like a bat, but they do not see everything.», reached through the same lesson line as the sentence the question matched. What matched: the same action «see» (+2); the same doer «sensors» (+2); the same thing acted on «everything» (+2). · the question and its options parsed, with trees and pragmatics

Test 9 · ★ · right ✓

You're on your bike next to a big lorry and you can't see its mirrors. What does that mean?

1. The mirrors are folded for cleaning — score 4
2. The lorry is parked for good — no support
3. The driver can't see you either — ← Mova's choice · ✓ the right answer · score 7
4. The driver is waving at you — score 4

Why: It took the question to ask what it is done to. It chose option 3 with score 7, against 4 for the next best. Its support: lesson 18, line 16: «Drivers have blind spots behind and to the sides, and a small child can be hidden behind a car; lorries have huge blind spots, and if you cannot see the driver…», reached through the option's own match among the sentences about the question's things. What matched: the same action «see» (+4); the same doer «driver» (+3). · the question and its options parsed, with trees and pragmatics

Test 10 · ★ · right ✓

Which is true about an airbag after it fills?

1. It fills the whole car up — no support
2. It quickly empties again — ← Mova's choice · ✓ the right answer · score 10
3. It can be used again at once — no support
4. It stays full for an hour — no support

Why: It took the question to ask which statement is true. It chose option 2 with score 10, the only option with support. Its support: lesson 18, line 11: «In a crash, sensors set off a small charge that fills a nylon airbag with gas in less time than a blink, bursting out with great force, and then it quickly emp…», reached through the remembered sentence the question matched. What matched: the same action «empty» (+4); the same doer «airbag» (+4); the same property (+2). · the question and its options parsed, with trees and pragmatics

Test 11 · ★ · right ✓

What would ABS do if the driver slammed the brakes on ice?

1. Spin the car round on purpose — no support
2. Stop the wheels locking so the driver can still steer — ← Mova's choice · ✓ the right answer · score 9
3. Make the car go faster — no support
4. Turn off the brakes completely so the tyres can slide along the ice — no support

Why: It took the question to ask what is done. It chose option 2 with score 9, the only option with support. Its support: lesson 18, line 8: «ABS anti-lock brakes notice when a wheel stops turning and skids, and release and press the brakes many times a second so the driver can still steer.», reached through the same lesson line as the sentence the question matched. What matched: it fills the role the question asks for (+5); the same action «stop» (+4). · the question and its options parsed, with trees and pragmatics

Exam question 1 · formal language · wrong ✗

Identify the principal function of a crumple zone in a motor vehicle.

1. The reduction of the cost of manufacture — ← Mova's choice · no support
2. The improvement of the vehicle's appearance — no support
3. The provision of additional storage space — no support
4. The absorption of energy so that occupants are decelerated more gently — ✓ the right answer · no support

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

Exam question 2 · formal language · wrong ✗

It is given that a child of nine years measures 130 centimetres. Ascertain, pursuant to United Kingdom rules, whether a child seat is required.

1. No child seat is required — ← Mova's choice · score 8
2. The child must sit in the front seat — score 4
3. A child seat is required only on motorways — score 8
4. A child seat or booster is required — ✓ the right answer · score 8

Why: It took the question to ask which statement is true. 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 8, line 12: «Crash tests are why every seat has a belt and children need the right car seat or booster for their size, so the belt sits across them safely.», reached through the remembered sentence the question matched. What matched: the same action «need» (+4); the same thing acted on «right car seat» (+4). The right option, 4, scored 8. · the question and its options parsed, with trees and pragmatics

Exam question 3 · formal language · right ✓

Which of the following statements most accurately characterises the operation of anti-lock braking systems?

1. The brakes are released and reapplied many times per second to retain steering — ← Mova's choice · ✓ the right answer · no support
2. The engine is reversed to arrest the vehicle — no support
3. The brakes are disabled upon wet surfaces — no support
4. The wheels are locked so as to shorten all stopping distances — 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 consistent with the established facts concerning the placement of a rear-facing infant seat.

1. It must never be placed before an active front airbag — ← Mova's choice · ✓ the right answer · no support
2. It must always be placed in the front seat beside the driver — no support
3. It requires no seat belt whatsoever — no support
4. It must face forwards in all circumstances — 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/18-car-safety/