Mississippi General Knowledge CDL Prep Test (MS) 4

5 out of 5 (42 votes)
80% Passing score
20 Questions
4 Mistakes allowed
Are you gearing up to take the Mississippi General Knowledge CDL test in 2026? If so, our fourth CDL practice test is an invaluable resource for you. This DMV practice test is specifically designed to help you prepare effectively for your big day. With 20 carefully crafted permit test questions, it mirrors the format of the actual DMV written test, offering a realistic experience. To pass, you need to correctly answer at least 16 sample questions. Our Mississippi CDL practice tests are not just any ordinary quizzes. They're tools for focused learning. You can tailor your study sessions to target areas where you need more practice. If there's a topic that's giving you trouble, spend more time on it. The flexibility of taking these online DMV sample tests multiple times means you can steadily improve your score, building confidence as you go. One of the biggest advantages of our Mississippi general knowledge CDL practice tests is the no-pressure environment they provide. It's a stark contrast to the high-stakes atmosphere of the DMV permit test. Here, you can make mistakes and learn from them without the stress of pass or fail hanging over your head. This relaxed setting is conducive to absorbing information and honing your skills at your own pace. Another key feature of our DMV practice tests is the instant feedback provided for each sample question. You're not just finding out whether your answers are right or wrong; you're also given detailed explanations. This feedback is crucial in understanding the reasoning behind the correct answers, deepening your knowledge and preparing you for the types of questions you'll encounter on the actual Mississippi written permit test. In summary, our fourth Mississippi CDL practice test is more than just a set of questions; it's a comprehensive learning tool! It's designed to help you master the material, understand your strengths and weaknesses, and walk into your CDL permit test with confidence!
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Sample Mississippi CDL Test Questions - General Knowledge

Question 1

What can a driver do when a coolant sight glass or see-through container allows the level to be checked without opening the pressurized system?

  1. A Check the coolant level while the engine is hot
  2. B Remove the hot radiator cap immediately
  3. C Use only plain water in the cooling system
  4. D Open any pressurized-system cap at operating temperature

Correct answer: A – Check the coolant level while the engine is hot

A sight glass, see-through overflow container, or recovery container may permit the coolant level to be checked while the engine is hot. If a container is not part of the pressurized system, its cap may also be removed and coolant added at operating temperature. Never remove a radiator cap or another pressurized-system component until the system has cooled.

Source: Mississippi Commercial Driver’s License Manual — § 2.14.1, “Engine Coolant”

Question 2

Properly adjusted outside convex mirrors on a school bus should show:

  1. A The entire side of the bus up to the mirror mounts
  2. B The front of the rear tires where they touch the ground
  3. C At least one traffic lane on each side of the bus
  4. D All of the above

Correct answer: D – All of the above

The Mississippi CDL manual directs school bus drivers to adjust the outside convex mirrors to show the entire side of the bus up to the mirror mounts, the front of the rear tires touching the ground, and at least one traffic lane on each side. Convex mirrors provide a wide field of view, but objects may appear smaller and farther away than they are.

Source: Mississippi Commercial Driver’s License Manual — § 10.1.4, “Outside Left and Right Side Convex Mirrors”

Question 3

Turning off a hot engine makes it immediately safe to remove the radiator cap.

  1. A TRUE
  2. B FALSE

Correct answer: B – FALSE

The Mississippi CDL manual says not to remove the radiator cap or another part of the pressurized cooling system until the system has cooled. Steam and boiling coolant can spray out under pressure and cause severe burns. Shut off the engine, allow it to cool, protect your hands, and release the cap slowly. A nonpressurized recovery container is different from the radiator cap.

Source: Mississippi Commercial Driver’s License Manual — § 2.14.1, “Vehicle Checks—Engine Coolant”

Question 4

In very hot weather, how often should you inspect your tires while driving?

  1. A Every two hours or 100 miles
  2. B Every three hours or 200 miles
  3. C Every hour or 50 miles
  4. D Every five hours or 400 miles

Correct answer: A – Every two hours or 100 miles

The Mississippi CDL manual calls for tire inspections every two hours or every 100 miles when driving in very hot weather. Check tire mounting and air pressure. Because pressure increases as tires heat up, do not release air from a hot tire. If a tire is too hot to touch, remain stopped until it cools.

Source: Mississippi Commercial Driver’s License Manual — § 2.14.1, “Vehicle Checks—Tires”

Question 5

What should you do before taking a curve in a manual-transmission commercial vehicle?

  1. A Reduce speed and select the proper gear before entering
  2. B Shift to a higher gear and accelerate into the curve
  3. C Stop at the beginning of every curve

Correct answer: A – Reduce speed and select the proper gear before entering

The Mississippi CDL manual instructs drivers to slow to a safe speed and downshift to the proper gear before entering a curve. This allows some power to be used through the curve and helps maintain control. Braking or shifting after entering can upset the vehicle’s stability and increase the risk of a skid or rollover.

Source: Mississippi Commercial Driver’s License Manual — § 2.3.1, “Manual Transmissions—Before Entering a Curve”, Mississippi Commercial Driver’s License Manual — § 2.6.3, “Speed and Curves”

Question 6

Which group includes tire problems that should be found during a vehicle inspection?

  1. A Overinflation or underinflation
  2. B Abnormal wear or tread separation
  3. C Cuts or other damage
  4. D All of the above

Correct answer: D – All of the above

Commercial vehicle tire problems include too much or too little air pressure, excessive wear, cuts, and tread separation. Each condition can contribute to tire failure or loss of vehicle control. Drivers should identify these defects during inspections and have unsafe conditions corrected before operating the vehicle.

Source: Mississippi Commercial Driver’s License Manual — § 2.1.3, “What to Look For—Tire Problems”

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