South Carolina General Knowledge CDL Practice Test
Below are 25 exam-style questions for the South Carolina General Knowledge CDL knowledge test, modeled on the FMCSA-aligned content used by the South Carolina Department of Motor Vehicles. Try to answer each question on your own before reading the answer key directly under it. The questions and answer choices are shuffled deterministically per state and endorsement, so the order will stay the same on repeat visits — that lets you genuinely measure your improvement.
- A Cover the brake and slow down
- B Move to the right lane
- C Maintain speed
- D Honk and accelerate
- A You brake hard on dry pavement
- B Tires are over-inflated
- C Tires lose contact with the road on a film of water
- D Roads are dry but hot
- A On vehicles with ABS
- B On vehicles without ABS, to keep them straight in an emergency
- C To save fuel
- D On wet roads only
- A Brake immediately and pull off the road
- B Shift to neutral and coast
- C Hold the steering wheel firmly, ease off the accelerator, and let the vehicle slow down
- D Steer sharply toward the shoulder
- A A vehicle is in safe operating condition
- B Required emergency equipment is missing
- C A passenger door is open
- D A trailer brake light is out
- A Roads are wet, icy, or snow-covered
- B On any downgrade
- C In residential areas only because of noise
- D Driving in dry conditions
- A At the end of the trip
- B Only when the load is hazardous
- C Within the first 25 miles, then about every 150 miles or every 3 hours
- D Only if a warning light comes on
- A Tying a load down once at the start is enough
- B Federal rules do not apply to cargo securement
- C Cargo is the shipper's responsibility, not yours
- D You must inspect cargo and securement before driving and within the first 50 miles
- A A fine only
- B No federal consequence
- C A warning
- D CDL disqualification for at least one year for a first offense
- A Roads are most slippery just after rain begins, when water mixes with road oil
- B Tire chains are required by federal law
- C High beams improve visibility in heavy rain
- D It is safe to drive at the posted speed limit
- A The full range of high-beam headlights when in use
- B Whatever speed feels safe
- C Half the range of your low-beam headlights
- D The range of your low-beam headlights
- A Stay in high gear
- B Coast in neutral
- C Use the parking brake intermittently
- D Select a lower gear before starting down
- A 6 seconds
- B 10 seconds
- C 4 seconds
- D 1 second
- A Fills the trailer floor edge to edge
- B Cannot shift on stops, starts, or turns and is within axle weight limits
- C Is loaded in the order it will be delivered
- D Looks neat from the outside
- A Stay at the same speed
- B Slow down before entering and accelerate gently through it
- C Brake while in the curve
- D Downshift in the curve
- A Gross Cargo Weight Rating
- B General Carrier Weight Rating
- C Government Combination Weight Reading
- D Gross Combination Weight Rating
- A Back to the right whenever possible
- B Use a helper and walk around the vehicle first
- C Back without using mirrors so you can watch out the window
- D Back fast to get it over with
- A Never communicate; just drive
- B Tap the horn lightly or flash lights to signal your presence
- C Honk loudly to warn other drivers
- D Make eye contact only when stopped
- A It applies the parking brake
- B It increases brake pressure automatically
- C It always stops the vehicle in a shorter distance
- D It prevents wheel lockup so the driver can keep steering
- A Properly working brakes
- B Manual transmissions
- C Old tires
- D Driving too fast for conditions
- A Any vehicle over 26,001 lbs
- B Class A combinations only
- C Tractor-trailers under 26,001 lbs GCWR
- D Vehicles designed to carry 16+ passengers including the driver, or that require hazmat placards
- A Accelerate
- B Brake hard immediately
- C Release the brake, let the wheels turn freely, and let the vehicle slow down
- D Steer sharply in the opposite direction
- A 12 and 6
- B Both hands at the bottom
- C One hand at 12
- D 10 and 2 (or 9 and 3)
- A 1 hour
- B 7 days
- C A reasonable time, before going off duty
- D 24 hours
- A To save fuel and improve mileage
- B To save brake pads and reduce drag
- C To rest the right leg
- D So the brake lights don't mislead following drivers and so the brakes don't overheat
Study tips for the South Carolina General Knowledge exam
The General Knowledge portion of the South Carolina CDL exam is graded out of the bank of questions the South Carolina Department of Motor Vehicles draws from each year. While the exact bank is not published, every question is sourced from the General Knowledge chapter of the South Carolina CDL handbook, which itself is derived from the FMCSA Model Commercial Driver's License Manual. That means studying our practice tests, reading the corresponding handbook chapter, and re-reading the parts you got wrong is genuinely the most efficient route to a first-time pass.
Most successful applicants follow a simple cycle: take the practice test cold, write down every question you missed, open the matching chapter of the official South Carolina handbook, re-read the section that contains the right answer, then re-take the practice test 24 to 48 hours later. The 24-hour delay matters — sleep is when your brain commits new information to long-term memory, and CDL knowledge questions reward that kind of consolidated learning rather than cramming.
Pay particular attention to questions that include qualifier words like always, never, only, primary, or most. CDL test writers love to flip the right answer with a single qualifier. When two answer choices look almost identical, pay attention to the verb (is it must, should, or may?) and to any numbers (14 days, 100 air miles, 8 hours, 70/8 split). On endorsement tests in particular, watch for trick framing where a true statement about a different endorsement is offered as the "correct" answer to a question that is actually about General Knowledge.
Test-day logistics matter too. Bring photo ID, your Social Security card or birth certificate, your medical examiner's certificate (DOT card), and proof of state residency if you haven't already submitted those documents. The South Carolina Department of Motor Vehicles will not let you sit for the knowledge exam without your documentation, and most offices charge an additional fee for re-attempts. Arrive early — the wait at most CDL testing offices runs 30 to 60 minutes — and silence your phone before the exam begins.
Finally, keep your General Knowledge fundamentals sharp even when you're focused on the General Knowledge exam. Many states administer multiple knowledge tests in a single sitting, and questions on weight definitions (GVWR, GCWR, GAWR), stopping distance, and the pre-trip inspection routine show up across endorsements. If you're unsure on the basics, sit a fresh South Carolina General Knowledge practice test before scheduling the real exam.
Next steps
Missed more than four questions? Re-read the General Knowledge study guide and the matching chapter in the official South Carolina CDL handbook. Then come back and re-take the test. Once you can score 22 of 25 or higher on three runs in a row, you're in good shape to schedule the real exam at your local South Carolina Department of Motor Vehicles office.
Already comfortable with this endorsement? Drill another: SC Air Brakes · SC Combination Vehicles · SC Hazardous Materials · SC Passenger · SC School Bus · SC Tank Vehicle · SC Doubles / Triples
New to the CDL process in South Carolina? Read How to apply for a CDL in South Carolina for the document checklist and step-by-step timeline.