CDL General Knowledge (Class A, B, or
C) Exam Practice Questions And Correct
Answers (Verified Answers) Plus
Rationales 2026 Q&A | Instant
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1. What is the main reason for performing a pre-trip inspection?
A. To check if the truck looks clean
B. To ensure the vehicle is safe to drive
C. To test your driving skills
D. To check if the cargo is heavy
Rationale: Pre-trip inspections help identify safety issues before
driving, preventing accidents.
2. How often should you check your mirrors while driving?
A. Once per hour
B. Only when changing lanes
C. Frequently, at regular intervals
, D. Only at intersections
Rationale: Frequent mirror checks ensure awareness of surrounding
traffic and potential hazards.
3. When is it safe to drive with a cracked windshield?
A. If it’s small and on the edge
B. Only during daytime
C. Only on highways
D. Never
Rationale: Cracks can obstruct vision or worsen while driving, making
it unsafe.
4. How much space should you keep between your truck and the vehicle
in front under normal conditions?
A. 1 second
B. 2 seconds
C. At least 4 seconds
D. 6 seconds
Rationale: A 4-second following distance allows time to react and
stop safely.
5. What is the primary cause of most truck accidents?
A. Bad weather
B. Poor brakes
C. Driver error
D. Road conditions
, Rationale: Human error, such as distraction or misjudgment, is the
leading cause of accidents.
6. When approaching a curve, you should:
A. Speed up to maintain momentum
B. Brake sharply in the curve
C. Slow down before entering the curve
D. Steer straight through
Rationale: Slowing down before a curve prevents rollover or loss of
control.
7. Which of the following is true about tire pressure?
A. Under-inflated tires last longer
B. Proper tire pressure prevents blowouts
C. Over-inflated tires are safer
D. Tire pressure doesn’t affect safety
Rationale: Correct tire pressure ensures even wear and reduces the
risk of blowouts.
8. How should you use brakes on a steep downgrade?
A. Hold down the brake pedal continuously
B. Use a low gear and apply brakes intermittently
C. Coast and only brake if necessary
D. Pump brakes rapidly
Rationale: Engine braking combined with intermittent braking
prevents brake overheating.
, 9. What is the safest way to back a large vehicle?
A. Quickly to save time
B. Without looking around
C. With a spotter whenever possible
D. Only by using mirrors
Rationale: A spotter helps prevent accidents by providing guidance
when visibility is limited.
10. When driving in fog, you should use:
A. High-beam headlights
B. Low-beam headlights
C. Hazard lights only
D. No lights
Rationale: Low beams reduce glare and improve visibility in fog.
11. What should you do if your brakes fail while driving?
A. Stop immediately without slowing
B. Shift into neutral and coast
C. Use the parking brake gradually and shift to a lower gear
D. Speed up to a safer area
Rationale: Using engine and parking brakes helps slow the vehicle
safely without sudden stops.
12. What is the main purpose of the vehicle’s suspension system?
A. Increase engine power
B. Improve fuel efficiency
C) Exam Practice Questions And Correct
Answers (Verified Answers) Plus
Rationales 2026 Q&A | Instant
Download Pdf
1. What is the main reason for performing a pre-trip inspection?
A. To check if the truck looks clean
B. To ensure the vehicle is safe to drive
C. To test your driving skills
D. To check if the cargo is heavy
Rationale: Pre-trip inspections help identify safety issues before
driving, preventing accidents.
2. How often should you check your mirrors while driving?
A. Once per hour
B. Only when changing lanes
C. Frequently, at regular intervals
, D. Only at intersections
Rationale: Frequent mirror checks ensure awareness of surrounding
traffic and potential hazards.
3. When is it safe to drive with a cracked windshield?
A. If it’s small and on the edge
B. Only during daytime
C. Only on highways
D. Never
Rationale: Cracks can obstruct vision or worsen while driving, making
it unsafe.
4. How much space should you keep between your truck and the vehicle
in front under normal conditions?
A. 1 second
B. 2 seconds
C. At least 4 seconds
D. 6 seconds
Rationale: A 4-second following distance allows time to react and
stop safely.
5. What is the primary cause of most truck accidents?
A. Bad weather
B. Poor brakes
C. Driver error
D. Road conditions
, Rationale: Human error, such as distraction or misjudgment, is the
leading cause of accidents.
6. When approaching a curve, you should:
A. Speed up to maintain momentum
B. Brake sharply in the curve
C. Slow down before entering the curve
D. Steer straight through
Rationale: Slowing down before a curve prevents rollover or loss of
control.
7. Which of the following is true about tire pressure?
A. Under-inflated tires last longer
B. Proper tire pressure prevents blowouts
C. Over-inflated tires are safer
D. Tire pressure doesn’t affect safety
Rationale: Correct tire pressure ensures even wear and reduces the
risk of blowouts.
8. How should you use brakes on a steep downgrade?
A. Hold down the brake pedal continuously
B. Use a low gear and apply brakes intermittently
C. Coast and only brake if necessary
D. Pump brakes rapidly
Rationale: Engine braking combined with intermittent braking
prevents brake overheating.
, 9. What is the safest way to back a large vehicle?
A. Quickly to save time
B. Without looking around
C. With a spotter whenever possible
D. Only by using mirrors
Rationale: A spotter helps prevent accidents by providing guidance
when visibility is limited.
10. When driving in fog, you should use:
A. High-beam headlights
B. Low-beam headlights
C. Hazard lights only
D. No lights
Rationale: Low beams reduce glare and improve visibility in fog.
11. What should you do if your brakes fail while driving?
A. Stop immediately without slowing
B. Shift into neutral and coast
C. Use the parking brake gradually and shift to a lower gear
D. Speed up to a safer area
Rationale: Using engine and parking brakes helps slow the vehicle
safely without sudden stops.
12. What is the main purpose of the vehicle’s suspension system?
A. Increase engine power
B. Improve fuel efficiency
