Massachusetts CDL Practice Test: General Knowledge (MA) 6

4.9 out of 5 (78 votes)
80% Passing score
50 Questions
10 Mistakes allowed
Greetings from the heart of Massachusetts! Are you ready to take a significant step towards obtaining your CDL in 2026? You're in the right place! Our Massachusetts CDL General Knowledge Practice Test is an invaluable resource for aspiring commercial drivers. This is the sixth CDL practice test available on our site, tailored to prepare you for your CDL written knowledge test. Dive into our CDL practice test, featuring 50 thought-provoking RMV permit test questions. Your goal? Answer at least 40 correctly. But don't worry, the same RMV questions will appear each time you retake this test, allowing you to focus on areas where you need improvement. This MA CDL practice test encompasses a wide range of topics, from vehicle equipment to emergency procedures, accident handling, pre-trip inspection, and a touch on hazardous materials. While you might not be gunning for the HazMat endorsement just yet, it's crucial to have a basic understanding of these materials. What sets our DMV practice test apart? It's completely free. Yes, you read that right! We offer the same features and learning opportunities as paid tests but without the cost. Customize your study sessions to focus on topics that challenge you. Retake this Massachusetts CDL general knowledge practice test multiple times to see your scores soar, and study whenever it suits you best! Another unique aspect of our CDL practice test is its untimed nature. Unlike the actual Mass CDL permit test, we allow you to take your time with each question, ensuring a deeper understanding and better learning experience. This approach is particularly beneficial for mastering time management skills, which are crucial for the real general knowledge test. So, whether you're a seasoned pro brushing up on your knowledge or a newcomer to the world of commercial driving, our Massachusetts CDL General Knowledge Practice Test is the perfect tool to help you succeed in 2026. Let's get you road-ready!
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Sample Massachusetts CDL Test Questions - General Knowledge

Question 1

Which actions may help when a hydraulic brake system loses pressure?

  1. A Shift to a lower gear
  2. B Pump the brake pedal
  3. C Use the parking brake controllably while looking for an escape route
  4. D All of these actions

Correct answer: D – All of these actions

Downshifting uses engine resistance to help slow the vehicle, while pumping the brake pedal may temporarily generate enough hydraulic pressure for braking. The parking or emergency brake is separate from the hydraulic system and may be applied controllably to reduce speed. The driver should also look for the least hazardous escape route if the vehicle cannot be stopped normally.

Source: Massachusetts Commercial Driver’s License Manual — § 2.17.3, “Brake Failure”

Question 2

An empty commercial truck normally has better braking performance than a loaded truck.

  1. A TRUE
  2. B FALSE

Correct answer: B – FALSE

Empty trucks can require greater stopping distance because they have less traction. Heavy-vehicle brakes, tires, springs, and shock absorbers are designed to perform best when the vehicle is loaded. With little or no load, the wheels can lock more easily during braking, increasing the risk of a skid and loss of control.

Source: Massachusetts Commercial Driver’s License Manual — § 2.6.1, “Stopping Distance”

Question 3

Which group includes the light function that must illuminate when the service brake is applied and turn off when it is released?

  1. A Clearance lights and four-way flashers
  2. B Taillights and clearance lights
  3. C Headlights and clearance lights
  4. D Brake lights, four-way flashers, and turn signals

Correct answer: D – Brake lights, four-way flashers, and turn signals

The Massachusetts lights operation check includes brake lights, left and right turn signals, and four-way flashers. Brake lights must come on when the service brake is applied and go off when it is released. The operation of external lights must be inspected from outside the vehicle, with assistance from the examiner when necessary.

Source: Massachusetts Commercial Driver’s License Manual — § 11.4, “Lights Operations Check (All Vehicles)”

Question 4

Under Massachusetts law, which road user requires an approaching driver to come to a full stop when crossing or attempting to cross a way?

  1. A A blind pedestrian using a guide dog or a raised white cane
  2. B A motorcyclist waiting to enter traffic
  3. C A passenger-car driver at an uncontrolled intersection
  4. D A bicyclist waiting beside the roadway

Correct answer: A – A blind pedestrian using a guide dog or a raised white cane

An approaching driver must stop for a totally or partially blind pedestrian who is crossing or attempting to cross while guided by a guide dog or carrying a raised or extended white cane. The driver must remain cautious and take the precautions necessary to avoid injuring the pedestrian before proceeding. The rule does not remove the legal rights of blind pedestrians who are not using these aids.

Source: M.G.L. c. 90, § 14A – Protection of blind pedestrians crossing or attempting to cross ways

Question 5

Which list best combines items to monitor while driving with critical items to inspect when you stop during a trip?

  1. A Gauges, exhaust, lights, cargo, and coupling devices
  2. B Gauges, brakes, lights, pumps, and hoses
  3. C Gauges, brakes, lights, cargo securement, and coupling devices
  4. D Gauges, shock absorbers, brake shoes, and frame members

Correct answer: C – Gauges, brakes, lights, cargo securement, and coupling devices

Drivers should watch their gauges for signs of trouble throughout a trip and use sight, hearing, smell, and touch to detect problems. At stops, critical checks include brakes, lights and reflectors, trailer connections, coupling devices, and cargo securement. Tires, wheels, and rims are also among the items that should be inspected.

Source: Massachusetts Commercial Driver’s License Manual — § 2.1.2, “Types of Vehicle Inspection”

Question 6

A water-type extinguisher is suitable for which class of fire?

  1. A Class A ordinary-combustible fire
  2. B Class B gasoline fire
  3. C Class B diesel-fuel fire
  4. D Class C electrical-equipment fire

Correct answer: A – Class A ordinary-combustible fire

Water is suitable for Class A fires involving wood, paper, and similar ordinary combustible materials. Gasoline and diesel are Class B flammable-liquid hazards and require an appropriate smothering or dry-chemical agent. Electrical fires require a nonconducting extinguishing agent; water must not be used on energized electrical equipment.

Source: Massachusetts Commercial Driver’s License Manual — § 2.21.3, “Fire Fighting”

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