California CDL — General Knowledge Practice Test 1

1.A heavy load is slowing you badly on a long upgrade and cars are stacking up behind you. What is the recommended thing to do?
Move left so faster traffic can use the shoulderStay in the right-hand lane and leave the passing to themTurn on your headlights to claim the lane you are inPull onto the shoulder and stop until the queue has cleared
2.How often should you check your mirrors while driving?
Only once when you first start drivingRegularly, and always before changing lanes, turning, or mergingOnly when you hear another vehicle's hornNever, because mirrors are a distraction
3.A sign posting a clearance such as "13 ft 6 in" at an underpass tells a truck driver what?
The maximum weight allowed on the bridgeThe distance to the next exitThe maximum overhead clearance for your vehicleThe minimum speed on the ramp
4.How does the 14-hour rule limit a property-carrying driver?
It sets the maximum speed at 14 mph in work zonesYou may not drive after the 14th hour since coming on dutyIt requires a 14-minute break every hourIt allows 14 hours of driving with no breaks
5.Diamond-shaped signs turned to stand on one point are fixed to the outside of a trailer. What information do they carry?
The hazard class of the material being hauledThe gross weight of the loaded trailerThe states the carrier is authorized to enterThe date of the trailer's last brake inspection
6.Which combination of factors decides how high a person's blood alcohol concentration will climb?
The proof of the drink and how recently the person ateThe person's height and how much sleep they hadHow much is drunk, how fast it is drunk, and the drinker's body weightThe brand of the drink and the temperature of the room
7.A car behind you wants to pass and you can see that the road ahead is clear. Should you wave the driver around?
Yes, flashing your lights is the accepted way to signal a clear roadNo — waving another driver past can leave you carrying the blame for the crashYes, but only on a two-lane road in daylightYes, provided you first sound your horn twice
8.How does alcohol affect your ability to drive?
It sharpens reactions in experienced driversIt slows reactions and impairs judgment, coordination, and visionIt affects only your sense of smellIt has no effect below the legal limit
9.When you have a choice about how to leave a large vehicle in a lot, which position is best?
One that puts the driver's door against a wall for securityOne you can drive straight out of, with no reversing needed on the way outOne that lets you reverse out toward the right sideOne at the far end of the lot, whichever way the exit lies
10.How should you adjust your speed on wet roads?
Keep the same speed as on dry roadsSlow down, because stopping distance increases on wet roadsSpeed up to get through the wet area fasterWet roads do not affect traction for heavy trucks