Theory questions
What proportion of the harmful substances does the catalytic converter filter out?
The catalytic converter “filters out 80–95 per cent.” (Driving Licence Book, 19th Edition, page 224)
Useful links:
- Catalytic converter (Körkortonline.se)
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Körkortonline.se offers driving licence theory tests in English (free demo test), Swedish (free demo test). This is an example of an explanation of a test question.
There is also a driving licence book online (2026).
More examples of explanations:
- Which are the two substances primarily produced by a functioning catalytic converter?
- What does it mean if this symbol lights up on the dashboard?
- What does it mean if this symbol lights up on the dashboard?
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- When should you give way to a bus that is standing at a bus stop?
- You are driving in an area where parking is prohibited. Are you permitted to park at point A?
- What is a reversible lane?
- It is dark outside, and you have your full beams on. When should you be able to see a person wearing dark clothing with no reflectors?
- It is dark outside, and you have your full beams on. When should you be able to see a person wearing reflectors?
- Do you have an obligation to give way to cyclists joining the road from the bicycle path on the right?
- Is it true that you are obliged to show consideration to certain road users?
- Which statement is true in this situation?
- Which statement is true in this situation?
- Why is it good to turn off your full beams for a moment before coming to the crest of a hill when driving in the dark?
- You intend to turn left. Do you need to use your direction indicators?
- Is it permitted to have dipped headlights and daytime lights on at the same time?
- It is 18.00 on a Sunday. Is it true that only electric (chargeable) vehicles are permitted to park here?
Category:
- Theory questions: Vehicle
- Theory questions: Environment
- Theory questions: Traffic safety
- Theory questions: Traffic regulations
- Theory questions: Individual circumstances
- Theory questions: Road signs
