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Free Mississippi CDL practice test online

Take a free Mississippi CDL practice exam online with clear explanations—no sign-up. Coverage includes general knowledge, vehicle systems, combination vehicles, cargo, and endorsements. Then verify current requirements with Mississippi Driver Service Bureau.

CDL knowledge tests are federally regulated, so the passing score in Mississippi is the same as everywhere else: 80% correct on every knowledge test. You must also hold a commercial learner’s permit for 14 days before the skills test.

Start practice Exam-style run

New to the knowledge test? CDL endorsements explained · One-week study plan

Practice coverage
Complete a run to establish your baseline.
600questions
23topics
80%federal pass mark

49 CFR 383.135(a)(1) sets the CDL knowledge-test passing score at 80%. Reaching it here is not a prediction of your official result.

Requirements before you test

Mississippi CDL test requirements

80%
Passing score
49 CFR 383.135(a)(1)
14 days
CLP held before skills test
Mississippi Driver Service Bureau
18
Min. CLP age
49 CFR 383.25(a)(4)
21
Min. age (interstate)
49 CFR 391.11(b)(1)

Commercial licensing is largely federal. Any figure above credited to a 49 CFR section applies in every state — see 49 CFR 383.135(a)(1) and 49 CFR 383.25(e). A figure credited to Mississippi Driver Service Bureau is Mississippi’s own, and may be stricter than the federal floor. Test length, fees, and scheduling are set by Mississippi Driver Service Bureau (official source).

Entry-Level Driver Training comes first

Since February 7, 2022, a new Class A or Class B CDL, a class upgrade, or a first passenger, school bus, or hazardous materials endorsement requires training from a provider on the FMCSA Training Provider Registry (49 CFR 380.600). Practice questions are study material and do not satisfy that requirement.

FMCSA Training Provider Registry

You need a Mississippi licence first

A commercial learner’s permit only counts if you already hold an ordinary licence from the same state (49 CFR 383.25(a)(2)). The Mississippi non-commercial knowledge test runs 30 questions and needs 24 correct, with permits issued from age 15.

Mississippi permit practice test
Quick practice
10 balanced questions with feedback after every answer.
Practice now
Topic review
Focus on one knowledge area before returning to mixed practice.
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Exam-style run
Answer the full starter bank before seeing your results.
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What you will practice

Build coverage topic by topic.

Each question carries a topic, difficulty, explanation, and source section so your review has context.

General knowledge29 reviewed questionsMountain driving12 reviewed questionsAir brakes61 reviewed questionsCombination vehicles54 reviewed questionsVehicle systems9 reviewed questionsCargo18 reviewed questionsTank vehicles47 reviewed questionsDoubles and triples43 reviewed questionsHazardous materials71 reviewed questionsSchool bus48 reviewed questionsPassenger vehicles45 reviewed questionsSafe driving6 reviewed questionsSpace management14 reviewed questionsVehicle inspection15 reviewed questionsEmergencies23 reviewed questionsHours of service14 reviewed questionsBasic control11 reviewed questionsSeeing hazards15 reviewed questionsWeather18 reviewed questionsNight driving7 reviewed questionsDriver fitness8 reviewed questionsSpeed management17 reviewed questionsCommunication15 reviewed questions

Sample questions

5 Mississippi CDL practice questions

Try these Mississippi sample questions now — each shows the correct answer with a plain-language explanation and a source section. The full 600-question bank is in the practice run.

  1. 1. Bus drivers need a CDL with a passenger endorsement for a vehicle designed for:

    • AAny van under 10,000 pounds GVWR
    • BOnly marked school routes
    • C8 or more persons including the driver
    • 16 or more persons including the driver

    Answer: 16 or more persons including the driver. If the bus has air brakes, you also need air-brake knowledge. Skills tests must match the class of vehicle you will drive.

    Source: Commercial Driver License Manual — Passenger vehicles — endorsement

  2. 2. Major CDL disqualifying offenses include driving a CMV under the influence and:

    • AChecking mirrors too often
    • BA single parking ticket
    • Leaving the scene of a CMV crash, among other major offenses in Part 383
    • DUsing cruise control

    Answer: Leaving the scene of a CMV crash, among other major offenses in Part 383. Federal rules set mandatory disqualification periods for major offenses, serious traffic violations, and railroad-crossing violations.

    Source: Commercial Driver License Manual — Introduction — disqualifications

  3. 3. If hydraulic brakes fail, pumping the brake pedal may:

    • ADamage ABS permanently always
    • Generate enough pressure to help stop the vehicle
    • CFill the air tanks
    • DRelease spring brakes

    Answer: Generate enough pressure to help stop the vehicle. Also downshift and carefully use the parking/emergency brake while modulating to avoid lockup.

    Source: Commercial Driver License Manual — Driving emergencies — hydraulic brake failure

  4. 4. After coupling a tractor and semitrailer, a tug test helps confirm that:

    • AThe trailer lights are off
    • BThe cargo doors are open
    • CThe landing gear is fully raised
    • The fifth-wheel jaws have locked around the kingpin

    Answer: The fifth-wheel jaws have locked around the kingpin. A gentle tug against the trailer brakes is one part of verifying a secure coupling. A visual inspection is also required.

    Source: Commercial Driver License Manual — Combination vehicles — coupling

  5. 5. How often should a commercial driver check the mirrors in normal driving?

    • Every 5 to 8 seconds
    • BOnce every minute
    • COnly before a lane change
    • DOnly when a vehicle passes

    Answer: Every 5 to 8 seconds. Regular checks show traffic entering your blind areas, tire problems, and cargo or door issues before they become emergencies.

    Source: Commercial Driver License Manual — Seeing — mirror use

Practice all 600 questions

CDL knowledge areas

Classes and endorsements, organized.

Each area below scopes the reviewed question bank to one knowledge test. The material is federal, so it applies in Mississippi just like everywhere else — the endorsement guide explains how the codes fit together.

General knowledge

The foundation for commercial driving: inspections, space, speed, communication, hazards, and safe operation.

  • Pre-trip inspection
  • Space and speed management
  • Railroad crossings
  • Emergency procedures
Practice general knowledge
Air brakes

Understand air-brake components, inspections, warning devices, stopping distance, and controlled braking.

  • Dual air systems
  • Low-air warnings
  • Brake lag and fade
  • Applied-leak and static checks
Practice air brakes
Combination vehicles

Prepare for safe coupling, inspection, turning, backing, and handling of tractor-trailer combinations.

  • Fifth-wheel inspection
  • Coupling and uncoupling
  • Off-tracking
  • Trailer skid prevention
Practice combination vehicles
Hazardous materialsEndorsement H

Study hazard communication, shipping papers, placards, loading rules, parking, and emergency response responsibilities.

  • Hazard classes
  • Placards and labels
  • Shipping papers
  • Loading and segregation
Practice hazardous materials
Tank vehiclesEndorsement N

Learn how liquid surge, outage, bulkheads, and high centers of gravity change vehicle handling.

  • Liquid surge
  • Outage requirements
  • Smooth braking
  • Rollover prevention
Practice tank vehicles
Doubles & triplesEndorsement T

Practice converter-dolly inspection, coupling order, rearward amplification, and stability principles.

  • Coupling sequence
  • Converter dollies
  • Rearward amplification
  • Space management
Practice doubles & triples
Passenger vehiclesEndorsement P

Prepare to inspect, load, and operate buses while keeping passengers, aisles, and exits safe.

  • Vehicle inspection
  • Passenger loading
  • Emergency exits
  • Prohibited practices
Practice passenger vehicles
School busEndorsement S

Review student loading, danger zones, mirrors, emergency procedures, and special railroad-crossing duties.

  • Danger zones
  • Student loading
  • Mirror use
  • Railroad crossings
Practice school bus
Official source hub
Verify current rules before your test.

QuizLane’s starter material points learners back to the agency responsible for licensing in Mississippi. Rules and manuals can change; the official agency remains authoritative.

Visit Mississippi Driver Service Bureau
Our accuracy promise
Original wording—not scraped competitor questions
A source section attached to every reviewed item
A correction path when something looks wrong
Read our methodology

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Common questions

What this practice can—and cannot—tell you.