Electricity — circuits, switches and safety
Tests: 5 of 13 right · Exam: 1 of 4 right · Kind: ★★ · Understood: 2 of 17 · Run: 2026-10-18, commit f3c23ea72
Lesson 55 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.
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 ✗
Tom builds a circuit with a battery, a bulb and wires, but uses a pencil's wooden body to join two wires. The bulb stays dark. Why?
- 1. The pencil needs to be sharpened — ← Mova's choice · no support
- 2. Wood is an insulator and blocks the flow — ✓ the right answer · no support
- 3. The bulb only works with plastic — no support
- 4. Wood is a conductor but the pencil is too short — 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 · ★★ · wrong ✗
In a doorbell circuit, what does pressing the button do?
- 1. It changes the bell into a light — ← Mova's choice · no support
- 2. It opens a gap in the wires so the bell rings — no support
- 3. It closes the gap so the bell rings — ✓ the right answer · no support
- 4. It charges the battery — 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 3 · ★★ · wrong ✗
Which is true?
- 1. Electricity flows best through rubber — ← Mova's choice · no support
- 2. Electricity can flow through a broken circuit — no support
- 3. A single battery is as dangerous as mains — no support
- 4. Electricity needs a complete path to flow — ✓ 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
Test 4 · ★★ · right ✓
A child wants to test whether a spoon is metal or plastic using a battery, a bulb and wires. What will show it is metal?
- 1. The bulb lights when the spoon fills the gap — ← Mova's choice · ✓ the right answer · no support
- 2. The battery gets lighter — no support
- 3. The bulb stays dark when the spoon fills the gap — no support
- 4. The spoon gets cold — 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 5 · ★★ · wrong ✗
A kettle cable has a crack and the copper inside shows. What should you do?
- 1. Wrap it in wet cloth and keep using it — ← Mova's choice · no support
- 2. Touch the copper to check it works — no support
- 3. Use it only when your hands are wet — no support
- 4. Stop using it and get it replaced — ✓ the right answer · 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 6 · ★★ · right ✓
What would happen to the lights in a circuit if a wire broke in the middle?
- 1. They would go out — ← Mova's choice · ✓ the right answer · score 2
- 2. They would change colour — score 2
- 3. They would keep shining as before — score 2
- 4. They would get brighter — score 2
Why: It took the question to ask what happens next. It chose option 1 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 5, line 11: «When you look at a far star, you see light that left it long ago, so you see the star as it was when that light set off.», reached through the option's own match among the sentences about the question's things. What matched: the same action «leave» (+1); the same doer «light» (+1). · the question and its options parsed, with trees and pragmatics
Test 7 · ★★ · right ✓
Why is a metal ladder dangerous near power lines but a dry wooden one less so?
- 1. Metal conducts electricity and dry wood does not easily — ← Mova's choice · ✓ the right answer · no support
- 2. Wooden ladders store electricity — no support
- 3. Wood is heavier than metal — no support
- 4. Metal is an insulator — 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 8 · ★★ · wrong ✗
In which device is electricity mainly changed into movement?
- 1. A light bulb — ← Mova's choice · no support
- 2. A heater — no support
- 3. An electric fan — ✓ the right answer · no support
- 4. A toaster — 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 9 · ★★ · right ✓
Two batteries are placed in a row in a torch instead of one. What happens to the bulb?
- 1. It turns into a switch — no support
- 2. It glows more dimly — no support
- 3. It stops working — no support
- 4. It glows brighter — ← Mova's choice · ✓ the right answer · score 4
Why: It took the question to ask which statement is true. It chose option 4 with score 4, the only option with support. Its support: lesson 55, line 14: «Adding more batteries in a row makes a bulb glow brighter.», reached through the same lesson line as the sentence the question matched. What matched: the same action «glow» (+4); the same property (+1). Against it: a different doer (counts against) (-1). · the question and its options parsed, with trees and pragmatics
Test 10 · ★★ · wrong ✗
bulb won't light, wire's come off one end, why
- 1. The bulb always needs two batteries to light up at all — ← Mova's choice · no support
- 2. One wire is enough for a bulb — no support
- 3. The circuit has a gap, so electricity cannot flow — ✓ the right answer · no support
- 4. The battery has gone cold — 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 11 · ★★ · wrong ✗
why are wires plastic on the outside
- 1. Plastic makes the electricity faster — ← Mova's choice · no support
- 2. It is only for the colours — no support
- 3. Plastic is an insulator that keeps the electricity in — ✓ the right answer · no support
- 4. Metal would melt the plastic — 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 12 · ★★ · right ✓
my little bro says it's fine to touch a plug with wet hands. true?
- 1. No, water can conduct electricity and it is dangerous — ← Mova's choice · ✓ the right answer · no support
- 2. Yes, wet hands are insulators — no support
- 3. Yes, water blocks electricity — no support
- 4. No, but only in the bath — 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 13 · ★★ · wrong ✗
Leo says a plastic spoon would make the circuit work. right?
- 1. Yes, any spoon works — ← Mova's choice · no support
- 2. No, only wooden spoons work — no support
- 3. Yes, plastic is a very good conductor of electricity — no support
- 4. No, plastic is an insulator and does not conduct — ✓ the right answer · 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 1 · formal language · wrong ✗
Which of the following statements most accurately characterises the condition necessary for the flow of electricity?
- 1. The circuit must contain at least one gap — ← Mova's choice · no support
- 2. The circuit must be immersed in water — no support
- 3. The wires must be coated externally in a layer of metal — no support
- 4. The circuit must be complete, without any gap — ✓ the right answer · 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 2 · formal language · wrong ✗
Identify, from the materials hereinafter enumerated, that which is designated a conductor of electricity.
- 1. Rubber — ← Mova's choice · no support
- 2. Plastic — no support
- 3. Glass — no support
- 4. Copper — ✓ the right answer · 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 · right ✓
It is given that a second battery is added in a row to a circuit containing a single bulb. Determine the consequent effect upon the bulb.
- 1. The bulb shall glow more brightly — ← Mova's choice · ✓ the right answer · no support
- 2. The bulb shall glow more dimly — no support
- 3. The bulb shall be extinguished forthwith — no support
- 4. The bulb shall remain wholly unaffected — 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 · wrong ✗
Select the response that is consistent with the established facts concerning the construction of electric wires.
- 1. They consist of rubber throughout their entire length — ← Mova's choice · no support
- 2. They consist of plastic internally with a metal coating externally — no support
- 3. They consist of glass internally with a wooden coating externally — no support
- 4. They consist of metal internally with a plastic coating externally — ✓ the right answer · 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
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