Free, full Massachusetts CDL general knowledge test practice right here in your browser — real exam format (50 questions, 80% to pass), diagnostic and adaptive modes, spaced-repetition review, and a readiness dashboard. No signup, no paywall — your progress is saved automatically on this device. Matched to the official RMV knowledge exam.
When evacuating a bus in an emergency, where should passengers be moved?
B. At least 100 feet away from the bus, off the road and upwind if there is a fuel leak or fire risk — Passengers should be evacuated to a safe distance (at least 100 feet) from the bus, off the road, and upwind if there is any risk of fuel leak or fire, to protect them from additional hazards.
How often should you check your mirrors while driving a commercial vehicle?
C. Every 5-8 seconds — Check mirrors every 5-8 seconds to maintain awareness of your surroundings and traffic conditions.
When uncoupling, after you pull the tractor partially clear of the trailer, you should:
D. Lower the landing gear if not already down — Lower the landing gear (if not already down) before pulling completely clear to ensure there's enough clearance.
The out-of-service BAC level for a CMV driver is:
D. 0.04% or above — A CMV driver with a BAC of 0.04% or higher must be placed out of service. Even a BAC between 0.01% and 0.039% requires the driver to be taken out of service for 24 hours.
CDL safety scenario 87: If the low air pressure warning activates while driving a commercial vehicle, what should you do?
B. Stop safely as soon as possible — Stop safely as soon as possible. Commercial drivers are expected to manage this situation before it becomes a crash risk. The CDL manual emphasizes controlling the vehicle, inspecting safety-critical systems, and correcting hazards promptly.
What three things add up to total stopping distance?
A. Perception distance, reaction distance, braking distance — Total stopping distance = perception distance (time to see hazard) + reaction distance (time to hit brakes) + braking distance (time to stop).
Air tanks should be drained of water and oil:
B. At the end of each driving day — Draining the tanks daily removes water and compressor oil that can freeze or reduce braking, keeping the system reliable.
The 'No-Zone' refers to:
A. The large blind spots around a commercial truck where crashes are likely — The No-Zones are the blind spots in front, behind, and beside a large truck where other vehicles disappear from the driver's view.
What should you check when inspecting the tractor's front axle area during a pre-trip?
B. Leaf springs or other spring mounts, shock absorbers, U-bolts, steering tie rod and drag link connections, and condition of the steer tires — Front axle inspection includes: spring hangers and mounting bolts, shock absorbers, U-bolts, steering linkage (tie rod ends, drag links, steering arm), and steer tire condition (tread, inflation, sidewall, valve stems).
Spring brakes will apply fully when air pressure drops below:
B. 20-45 PSI — Spring brakes will apply fully when air pressure drops to 20-45 PSI range, bringing the vehicle to a stop.
The Massachusetts CDL general knowledge test has 50 questions, and you need 80% to pass — at least 40 correct answers. The practice tests on this page use the same format. The 80% passing score is a federal FMCSA standard used by every state.
80%. You can miss at most 10 of the 50 questions. The readiness dashboard on this page tracks whether you're consistently scoring above that bar.
In Massachusetts, driver licensing is handled by the Registry of Motor Vehicles (RMV), so you'll often see the exam called the RMV CDL general knowledge test. The practice tests on this page match the official RMV knowledge exam format.
Yes. Every practice test on this page and everything in the DMVPrep iPhone app is free — no ads, no paywall, no account.
Federal motor carrier safety regulations (FMCSA) — the same rules every state's CDL exam is drawn from. Every question in the DMVPrep app cites the regulation or handbook section it comes from.
Yes — the DMVPrep app includes all 3,745+ questions in Spanish, and the whole app works in Spanish.