The answer options
- To see which fuel supplier is the most popular
- To cover the cost of garage equipment
- To ensure diesel and petrol engines give off the same fumes
- To help protect the environmentCorrect
Why that is the answer
The exhaust emissions test measures the harmful gases released by your vehicle. Ensuring these pollutants stay within legal limits helps protect the environment and improves air quality. Petrol and diesel engines produce different emissions, so the test checks each against specific standards rather than making them equal. DVSA guidelines require this check during the MOT test to reduce environmental damage and ensure your vehicle remains roadworthy.
How this comes up in the real test
Questions from safety and your vehicle appear throughout the 50-question multiple-choice section, and the wording changes between versions. Learn the rule rather than the sentence: the DVSA can ask the same point from the opposite direction, and a memorised answer falls over the moment the phrasing moves.
The pass mark is 43 out of 50, so seven wrong answers is your entire margin. If a whole category is shaky, run the topic practice below until you are getting every question right for the right reason, then go back to full mocks under the clock.
More safety and your vehicle questions
- Before leaving your vehicle unattended, what should you remove from it?
- How can drivers help the environment?
- How can driving in a fuel-efficient manner help protect the environment?
- How can the volume of traffic on roads be reduced?
- How can you avoid wasting fuel?
- How can you deter thieves from stealing your vehicle?