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  • Based on 2025 ON commercial driver's licence manual
  • Updated for January 2025

Ontario Class B (Bus) Commercial Licence Practice Test 11

Welcome to the final practice test in this series—Practice Test 11. This test centers around vehicle maintenance, an often overlooked but essential part of being a Class B driver in Ontario. The test comprises 50 questions and requires an 80% pass score. Maintenance is not just about vehicle longevity but also about ensuring a safe journey for all.
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What you need to know
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Verified by Steven Litvintchouk, M.S., Chief Educational Researcher, Member of ACES. See our detailed commitment to accuracy and quality in our practice tests.
What to expect on the official exam
50

questions

40

correct answers to pass

80

passing score

List of questions (classic view)
  1. How often are bus operators required to get their vehicles inspected?
  2. What is the minimum age requirement to drive a bus with a Class C or F licence?
  3. What is not a part of your road test for Class C and F?
  4. For a Class C or F licence, what is the minimum class of licence you must have?
  5. When can you attempt a knowledge test for a Class C or F licence?
  6. When parking a vehicle with a manual transmission facing uphill, you should always leave the parking brake on and the transmission in
  7. When driving at night, you should do which of the following?
  8. When passing parked cars in a bus, what should you do?
  9. When pulling away from the curb in a bus, you should
  10. When pulling out from an alley, you must
  11. When refuelling a school bus, you must
  12. When refuelling your vehicle, you should
  13. When should you check the tire pressures?
  14. When transporting persons with disabilities, you should do all of the following EXCEPT
  15. When traveling down a steep hill, you should NOT
  16. When travelling downhill, what can you do to prevent your brakes from overheating?
  17. When turning left from one two-way street onto another, where should you begin your turn?
  18. When using the applied stroke method to check pushrod stroke, how much pressure should you apply to the service brakes?
  19. When you are following a motorcycle, allow extra space between your vehicle and the motorcycle because
  20. When you are preparing to make a right turn from the right lane, you should shoulder check to the right to make sure
  21. When you conduct a pre-trip inspection of your vehicle, all of the following should be considered major defects EXCEPT
  22. When you encounter a flashing yellow signal at an intersection, what should you do?
  23. When you press down on the clutch in a vehicle with manual transmission, what does it do?
  24. When you see a potential hazard in your danger zone, you should
  25. When you're driving in an urban area, you should scan ahead about
  26. Where are a large commercial vehicle's blind spots?
  27. Where are a large vehicle's blind spots?
  28. Which of the following are true about a humpback railway crossing?
  29. Which of the following are true about brake fade?
  30. Which of the following can impair your ability to safely operate a vehicle?
  31. Which of the following can impair your driving?
  32. Where would an air dryer be installed in an air brake system?
  33. Which of the following are advantages of a dual air brake system?
  34. Which of the following can increase the danger of crossing railway tracks?
  35. Which of the following factors determine the sharpness of your large vehicle’s turn?
  36. Which of the following may reduce the amount of steering control you have?
  37. Which of the following should you check periodically during your trip?
  38. Which of the following statements about a vehicle's turning radius are true?
  39. Which of the following statements about changing lanes is true?
  40. Which of the following statements about railway crossings is FALSE?
  41. Which of the following statements about revolutions per minute (rpm) are true?
  42. Which of the following statements best describes "proactive (defensive) driving?"
  43. Which of the following can increase your vehicle's stopping distance (i.e., the length of your danger zone)?
  44. Which of the following statements about a vehicle's retarder is FALSE?
  45. Which of the following types of commercial vehicles are required to carry fire extinguishers?
  46. Which real forces act on your vehicle as you drive around a curve?
  47. While you drive, you should check your rear-view mirrors
  48. While you're driving a school bus, it breaks down on the road. What should you do?
  49. While you're waiting in an intersection to turn left, which way should you point your front wheels?
  50. Who is ultimately responsible for the condition of the brakes on a vehicle?
  51. Why are drivers required to complete a trip inspection report?
  52. Why do the hours of service regulations exist?
  53. Why is it risky to drive faster than the traffic flow?
  54. Why should you do a shoulder check when making a right turn?
  55. Why should you never run your vehicle's engine in a closed garage?
  56. You are pulling a trailer equipped with air brakes. How can you tell if you have cross-connected the supply line and the service line?
  57. You may be fined as much as _______ for driving a vehicle whose brakes are out of adjustment.
  58. You're driving a vehicle equipped with an automatic front-wheel limiting system (ratio valve). If you brake hard during an emergency stop, the air pressure delivered to the front brakes will be approximately _____ of the air pressure to the rear brakes.
  59. At a railway crossing that has a stop sign, you must stop _________ from the nearest rail.
  60. A Class C driver's licence allows you to drive which of the following?
  61. How is a traffic circle different from a roundabout?
  62. In the daytime, if your vehicle is carrying a load that extends at least _______ beyond the rear of your vehicle, you must attach a red flag to the end of the load.