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Ontario · G1 Knowledge Test · G1 · DriveTest (MTO)

Ontario G1 Knowledge Test — G1 Practice Question

Knowledge test administered by DriveTest (MTO) for the G1 licence. 40 questions, 80% to pass.

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Accuracy —
Emergency Situations

You should never leave your vehicle's engine running in a closed garage because:

Show Answer & Explanation
Correct Answer: B. Carbon monoxide is a deadly, odourless gas

Carbon monoxide (CO) is colourless, odourless, and fatal. A running engine in a closed garage produces lethal levels in minutes. Even with the garage door open, cold-start idle warming should be avoided in attached garages.

Why the other answers are wrong

  • A.It wastes fuelFuel waste is a minor concern next to CO poisoning.
  • C.The engine will overheat quicklyOverheating is a mechanical issue, not the fatal risk.
  • D.The transmission will failTransmission failure is not the concern; CO poisoning is.

More Emergency Situations Questions

Your headlights suddenly fail while you are driving at night. You should: Your windshield wipers suddenly stop working during heavy rain. You should: You notice smoke coming from under your hood. You should: When you brake hard in a vehicle equipped with anti-lock brakes (ABS), you feel the pedal vibrating. You should: You see a deer standing at the edge of a rural highway ahead of you. You should:

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