Iowa General Knowledge Practice Test
This is our Iowa General Knowledge Practice Quiz and Practice Test compiled of 50 questions each. Each question is worth two points for a total of 100 possible points. A passing score is 80%.
The General Knowledge Practice Quiz reveals the correct answer during each question to help you study for the actual General Knowledge test. The General Knowledge Practice Test doesn’t reveal the correct answers until the test is over.
The questions and answers are given in random order each time you retake the test. When you are finished testing, simply click on the “Get Results” button to see your test results. Clicking on the blue “List” button will reveal a list of all the questions you answered correctly and incorrectly. To take the test again, just refresh your browser window. It’s that easy.
Press the start button to begin your free General Knowledge Practice Quiz. Good luck!
General Knowledge CDL Practice Quiz
Question 1 |
A | the lug nut is cheap. |
B | the lug nut needs to be replaced. |
C | the lug nut is loose. |
D | the wheel needs cleaning. |
Question 2 |
A | Play in the steering wheel of more than ten degrees (two inches on a 20-inch steering wheel). |
B | Oil on the tie rod. |
C | Too many vertical stacks. |
D | Play in the steering wheel of more than five degrees. |
Question 3 |
A | two |
B | three |
C | four |
D | one |
Question 4 |
A | three times |
B | half |
C | two times |
D | four times |
Question 5 |
A | bad tires. |
B | driving too fast for road conditions. |
C | poorly adjusted brakes. |
D | driving too slow for road conditions. |
Question 6 |
A | check the coolant level of a hot engine. |
B | safely remove the radiator cap and add coolant while the engine is hot. |
C | use only water in the cooling system. |
D | use windshield washer fluid as coolant. |
Question 7 |
A | the load can shift. |
B | the load should not get wet. |
C | the load can catch fire easily. |
D | a dry bulk tank should only be filled halfway. |
Question 8 |
A | it is a federal law. |
B | you want to avoid doing something all of a sudden. |
C | you want to have time to act before it turns into an emergency. |
D | you want to have a plan to communicate the risk. |
Question 9 |
A | Road construction zones. |
B | A stopped transit bus. |
C | Pedestrians and bicyclists. |
D | All of these are considered a hazard. |
Question 10 |
A | Perception distance, slowing distance, and braking distance. |
B | Perception distance, reaction distance, and braking distance. |
C | Perception distance, response distance, and reaction distance. |
D | Observation distance, reaction distance, and slowing distance. |
Question 11 |
A | exempt from weight limit restrictions. |
B | exempt from hazardous materials restrictions. |
C | exempt from height restrictions. |
D | generally used when freight is carried part way by rail or ship. |
Question 12 |
A | increases when the service brakes are hot. |
B | depends on the service brakes being in adjustment. |
C | is not affected by the condition of the service brakes. |
D | decreases when the service breaks are hot. |
Question 13 |
A | to help ensure the vehicle will make it to your destination. |
B | because law enforcement may inspect your vehicle on the road. |
C | to ensure safety for yourself, your passengers, and other drivers. |
D | because it is a requirement for all drivers. |
Question 14 |
A | dual tires that touch, hot road surfaces |
B | over-heated brakes, under-inflated tires |
C | poor-quality retreads, under-inflated tires |
D | under-inflated tires, dual tires that touch |
Question 15 |
A | neither of these. |
B | the legal weight limits. |
C | both of these. |
D | the weight of the liquid. |
Question 16 |
A | The same amount of space you would on a dry road. |
B | One vehicle length for every 10,000 lb. of gross vehicle weight. |
C | The same amount of space you would at night. |
D | More space than is needed for ideal driving conditions. |
Question 17 |
A | turn up the radio. |
B | slap yourself in the face three times. |
C | roll down the windows. |
D | stop to sleep. |
Question 18 |
A | at least once a week. |
B | if any problems occurred the last the time the vehicle was operated. |
C | whenever you stop to refuel. |
D | before operating the vehicle. |
Question 19 |
A | both loose fuel connections and under inflated tires |
B | eating spicy food in the truck cab |
C | loose fuel connections |
D | under inflated tires |
Question 20 |
A | there is ice and snow, to prevent skidding. |
B | you will be parked for a short time. |
C | testing the trailer brakes after hooking up to a trailer. |
D | it is absolutely necessary. |
Question 21 |
A | to avoid mixing hazmat with food. |
B | to warn others of hazardous materials. |
C | to combat terrorism. |
D | to make your vehicle look official. |
Question 22 |
A | before starting down a hill and before going up a hill. |
B | before starting down a hill and before entering a tunnel. |
C | before starting down a hill and before entering a curve. |
D | before going up a hill and before entering a curve. |
Question 23 |
A | Move forward slowly and push firmly on the brake pedal. |
B | Push the brake pedal firmly 5 seconds; listen for leaks. |
C | Pump the brake pedal 5 times; push the pedal firmly 3 seconds; the pedal should not move. |
D | Pump the brake pedal 3 times; push the pedal firmly 5 seconds; the pedal should not move. |
Question 24 |
A | law enforcement officers, detours |
B | truck stops, gas stations |
C | vehicles, traffic signs |
D | tunnels, overpasses |
Question 25 |
A | rubbing |
B | rust |
C | burning |
D | leaks |
Question 26 |
A | Shorter stopping distance. |
B | It depends on what mood you are in at the time. |
C | Greater stopping distance. |
D | The same amount of stopping distance. |
Question 27 |
A | Using your CB radio or cell phone to inform others. |
B | Using a helper when backing up. |
C | Using turn signals, 4-way flashers, headlights, and the horn. |
D | Using hand signals. |
Question 28 |
A | To see the blind spots you can't see. |
B | To prevent others from distracting you. |
C | To watch for steering errors. |
D | To direct traffic away from you. |
Question 29 |
A | Use a higher gear than you would use to climb the hill. |
B | Shift the truck into neutral and coast down the hill to save gas. |
C | Use the same gear you would use to climb the hill. |
D | Use a lower gear than you would use to climb the hill. |
Question 30 |
A | the trailer is out of brake adjustment. |
B | the trailer is fully loaded or very heavy. |
C | the trailer is empty or lightly loaded. |
D | the trailer is being hauled at high speed. |
Question 31 |
A | seal is secure. |
B | placard numbers match the seal numbers. |
C | seal is authentic. |
D | load is properly secured. |
Question 32 |
A | Judgment and self-control are the first to be affected. |
B | All of these things happen. |
C | Muscle control and coordination are affected. |
D | The drinker's brain is increasingly affected. |
Question 33 |
A | Load more cargo toward the front of the truck for a full load. |
B | Load cargo toward the rear of the truck for easier unloading. |
C | Load cargo weight evenly over all the axles. |
D | Load more weight over the drive axle for better traction. |
Question 34 |
A | the end of the kingpin is even with the top of the fifth wheel. |
B | it will be raised slightly when the tractor is backed under it. |
C | the kingpin is about 1¼ inches above the fifth wheel. |
D | the end of the kingpin is at waist level. |
Question 35 |
A | Downshift after you are in the curve. |
B | Turn on your four-way flashers as you approach the offramp. |
C | Nothing, because the posted speed limit for the offramp is usually 10 miles per hour below the safe speed limit for the offramp. |
D | Slow to a safe speed before the curve. |
Question 36 |
A | the brake pedal feels firm when you apply pressure. |
B | you have to push harder and harder to get the same stopping power on a downgrade. |
C | there is a slight vibration when you press down on the brake pedal. |
D | you release pressure on the brake pedal and speed increases. |
Question 37 |
A | 2/32-inch in every major groove. |
B | 3/32-inch in every major groove. |
C | 5/32-inch in every major groove. |
D | 4/32-inch in every major groove. |
Question 38 |
A | Because it's good to know that information. |
B | Because tank baffles are not always legal with outage. |
C | Because some liquids expand more than others when they get warm. |
D | Because some of the heaviest liquids don’t need any. |
Question 39 |
A | one half inch |
B | one inch |
C | three inches |
D | two inches |
Question 40 |
A | three or more. |
B | seven or more. |
C | none of these. |
D | five or more. |
Question 41 |
A | Electrical fire. |
B | Gasoline fire. |
C | None of these fires can be safely extinguished by water. |
D | Grease fire. |
Question 42 |
A | Warn other drivers by using your left turn signal lights. |
B | Put your warning devices out within 15 minutes. |
C | Turn on your 4-way emergency flashers to warn other drivers. |
D | Keep your low beam lights on. |
Question 43 |
A | A minimum of three. |
B | A minimum of one. |
C | A minimum of four. |
D | A minimum of two. |
Question 44 |
A | mirrors |
B | rear view cameras |
C | rolled down windows |
D | sunglasses |
Question 45 |
A | turn right and drive over the curb |
B | turn wide before you start the turn |
C | start the turn, then back up to re-position |
D | turn wide as you complete the turn |
Question 46 |
A | downshift into the turn. |
B | keep the cargo as close to the ground as possible. |
C | keep two hands firmly planted on the steering wheel at all times. |
D | check to make sure that the brakes are properly balanced. |
Question 47 |
A | require greater stopping distance than full trucks |
B | have better traction when stopping than full trucks |
C | need less space ahead than full trucks |
D | have the same stopping distance as full trucks |
Question 48 |
A | make sure you are driving slow enough so you can stop within the range of your headlights in case of an emergency. |
B | roll down your window so that the fresh air will help keep you awake. |
C | keep your high beams on at all times. |
D | drink coffee or other caffeine products to help keep you awake. |
Question 49 |
A | you are driving on the freeway. |
B | you are driving on hilly, rural roads. |
C | the road is wet, icy, or snow covered. |
D | road conditions are excellent. |
Question 50 |
A | slidetracking. |
B | offtracking. |
C | fishtailing. |
D | sidetracking. |
← | List | → |
1 | 2 | 3 | 4 | 5 |
6 | 7 | 8 | 9 | 10 |
11 | 12 | 13 | 14 | 15 |
16 | 17 | 18 | 19 | 20 |
21 | 22 | 23 | 24 | 25 |
26 | 27 | 28 | 29 | 30 |
31 | 32 | 33 | 34 | 35 |
36 | 37 | 38 | 39 | 40 |
41 | 42 | 43 | 44 | 45 |
46 | 47 | 48 | 49 | 50 |
End |
Remember, the General Knowledge Practice Test doesn’t reveal the correct answers until the test is over. The questions and answers are given in random order each time you retake the test. When you are finished testing, simply click on the “Get Results” button to see your test results. Clicking on the blue “List” button will reveal a list of all the questions you answered correctly and incorrectly. To take the test again, just refresh your browser window.
Press the start button to begin your free General Knowledge Practice Test. Good luck!
General Knowledge CDL Practice Test
Question 1 |
A | generally used when freight is carried part way by rail or ship. |
B | exempt from weight limit restrictions. |
C | exempt from height restrictions. |
D | exempt from hazardous materials restrictions. |
Question 2 |
A | poor-quality retreads, under-inflated tires |
B | over-heated brakes, under-inflated tires |
C | dual tires that touch, hot road surfaces |
D | under-inflated tires, dual tires that touch |
Question 3 |
A | you release pressure on the brake pedal and speed increases. |
B | the brake pedal feels firm when you apply pressure. |
C | there is a slight vibration when you press down on the brake pedal. |
D | you have to push harder and harder to get the same stopping power on a downgrade. |
Question 4 |
A | slidetracking. |
B | offtracking. |
C | sidetracking. |
D | fishtailing. |
Question 5 |
A | have the same stopping distance as full trucks |
B | have better traction when stopping than full trucks |
C | require greater stopping distance than full trucks |
D | need less space ahead than full trucks |
Question 6 |
A | two inches |
B | one half inch |
C | one inch |
D | three inches |
Question 7 |
A | slap yourself in the face three times. |
B | turn up the radio. |
C | stop to sleep. |
D | roll down the windows. |
Question 8 |
A | you want to have a plan to communicate the risk. |
B | it is a federal law. |
C | you want to have time to act before it turns into an emergency. |
D | you want to avoid doing something all of a sudden. |
Question 9 |
A | Pedestrians and bicyclists. |
B | Road construction zones. |
C | All of these are considered a hazard. |
D | A stopped transit bus. |
Question 10 |
A | Nothing, because the posted speed limit for the offramp is usually 10 miles per hour below the safe speed limit for the offramp. |
B | Downshift after you are in the curve. |
C | Turn on your four-way flashers as you approach the offramp. |
D | Slow to a safe speed before the curve. |
Question 11 |
A | none of these. |
B | five or more. |
C | three or more. |
D | seven or more. |
Question 12 |
A | driving too slow for road conditions. |
B | poorly adjusted brakes. |
C | driving too fast for road conditions. |
D | bad tires. |
Question 13 |
A | burning |
B | rust |
C | rubbing |
D | leaks |
Question 14 |
A | Put your warning devices out within 15 minutes. |
B | Turn on your 4-way emergency flashers to warn other drivers. |
C | Keep your low beam lights on. |
D | Warn other drivers by using your left turn signal lights. |
Question 15 |
A | because law enforcement may inspect your vehicle on the road. |
B | because it is a requirement for all drivers. |
C | to ensure safety for yourself, your passengers, and other drivers. |
D | to help ensure the vehicle will make it to your destination. |
Question 16 |
A | four times |
B | three times |
C | two times |
D | half |
Question 17 |
A | four |
B | two |
C | three |
D | one |
Question 18 |
A | both loose fuel connections and under inflated tires |
B | underinflated tires |
C | loose fuel connections |
D | overinflated tires |
Question 19 |
A | to avoid mixing hazmat with food. |
B | to make your vehicle look official. |
C | to combat terrorism. |
D | to warn others of hazardous materials. |
Question 20 |
A | the trailer is empty or lightly loaded. |
B | the trailer is fully loaded or very heavy. |
C | the trailer is out of brake adjustment. |
D | the trailer is being hauled at high speed. |
Question 21 |
A | Pump the brake pedal 3 times; push the pedal firmly 5 seconds; the pedal should not move. |
B | Pump the brake pedal 5 times; push the pedal firmly 3 seconds; the pedal should not move. |
C | Push the brake pedal firmly 5 seconds; listen for leaks. |
D | Move forward slowly and push firmly on the brake pedal. |
Question 22 |
A | The same amount of stopping distance. |
B | Shorter stopping distance. |
C | Greater stopping distance. |
D | It depends on what mood you are in at the time. |
Question 23 |
A | there is ice and snow, to prevent skidding. |
B | it is absolutely necessary. |
C | testing the trailer brakes after hooking up to a trailer. |
D | you will be parked for a short time. |
Question 24 |
A | the legal weight limits. |
B | the weight of the liquid. |
C | neither of these. |
D | both of these. |
Question 25 |
A | turn right and drive over the curb |
B | turn wide before you start the turn |
C | turn wide as you complete the turn |
D | start the turn, then back up to re-position |
Question 26 |
A | before starting down a hill and before entering a curve. |
B | before starting down a hill and before entering a tunnel. |
C | before starting down a hill and before going up a hill. |
D | before going up a hill and before entering a curve. |
Question 27 |
A | Oil on the tie rod. |
B | Too many vertical stacks. |
C | Play in the steering wheel of more than five degrees. |
D | Play in the steering wheel of more than ten degrees (two inches on a 20-inch steering wheel). |
Question 28 |
A | load is properly secured. |
B | placard numbers match the seal numbers. |
C | seal is authentic. |
D | seal is secure. |
Question 29 |
A | is not affected by the condition of the service brakes. |
B | increases when the service brakes are hot. |
C | decreases when the service breaks are hot. |
D | depends on the service brakes being in adjustment. |
Question 30 |
A | None of these fires can be safely extinguished by water. |
B | Grease fire. |
C | Electrical fire. |
D | Gasoline fire. |
Question 31 |
A | tunnels, overpasses |
B | truck stops, gas stations |
C | vehicles, traffic signs |
D | law enforcement officers, detours |
Question 32 |
A | Because tank baffles are not always legal with outage. |
B | Because some liquids expand more than others when they get warm. |
C | Because some of the heaviest liquids don’t need any. |
D | Because it's good to know that information. |
Question 33 |
A | check to make sure that the brakes are properly balanced. |
B | downshift into the turn. |
C | keep two hands firmly planted on the steering wheel at all times. |
D | keep the cargo as close to the ground as possible. |
Question 34 |
A | roll down your window so that the fresh air will help keep you awake. |
B | make sure you are driving slow enough so you can stop within the range of your headlights in case of an emergency. |
C | keep your high beams on at all times. |
D | drink coffee or other caffeine products to help keep you awake. |
Question 35 |
A | the load should not get wet. |
B | the load can catch fire easily. |
C | the load can shift. |
D | a dry bulk tank should only be filled halfway. |
Question 36 |
A | Using turn signals, 4-way flashers, headlights, and the horn. |
B | Using a helper when backing up. |
C | Using hand signals. |
D | Using your CB radio or cell phone to inform others. |
Question 37 |
A | 4/32-inch in every major groove. |
B | 5/32-inch in every major groove. |
C | 3/32-inch in every major groove. |
D | 2/32-inch in every major groove. |
Question 38 |
A | you are driving on the freeway. |
B | the road is wet, icy, or snow covered. |
C | road conditions are excellent. |
D | you are driving on hilly, rural roads. |
Question 39 |
A | mirrors |
B | sunglasses |
C | rolled down windows |
D | rear view cameras |
Question 40 |
A | The drinker's brain is increasingly affected. |
B | Muscle control and coordination are affected. |
C | All of these things happen. |
D | Judgment and self-control are the first to be affected. |
Question 41 |
A | Use a lower gear than you would use to climb the hill. |
B | Use a higher gear than you would use to climb the hill. |
C | Use the same gear you would use to climb the hill. |
D | Shift the truck into neutral and coast down the hill to save gas. |
Question 42 |
A | To direct traffic away from you. |
B | To prevent others from distracting you. |
C | To see the blind spots you can't see. |
D | To watch for steering errors. |
Question 43 |
A | it will be raised slightly when the tractor is backed under it. |
B | the kingpin is about 1¼ inches above the fifth wheel. |
C | the end of the kingpin is at waist level. |
D | the end of the kingpin is even with the top of the fifth wheel. |
Question 44 |
A | Load cargo toward the rear of the truck for easier unloading. |
B | Load more weight over the drive axle for better traction. |
C | Load cargo weight evenly over all the axles. |
D | Load more cargo toward the front of the truck for a full load. |
Question 45 |
A | A minimum of one. |
B | A minimum of four. |
C | A minimum of three. |
D | A minimum of two. |
Question 46 |
A | safely remove the radiator cap and add coolant while the engine is hot. |
B | use windshield washer fluid as coolant. |
C | check the coolant level of a hot engine. |
D | use only water in the cooling system. |
Question 47 |
A | before operating the vehicle. |
B | at least once a week. |
C | if any problems occurred the last the time the vehicle was operated. |
D | whenever you stop to refuel. |
Question 48 |
A | One vehicle length for every 10,000 lb. of gross vehicle weight. |
B | More space than is needed for ideal driving conditions. |
C | The same amount of space you would at night. |
D | The same amount of space you would on a dry road. |
Question 49 |
A | the lug nut needs to be replaced. |
B | the wheel needs cleaning. |
C | the lug nut is loose. |
D | the lug nut is cheap. |
Question 50 |
A | Perception distance, reaction distance, and braking distance. |
B | Perception distance, response distance, and reaction distance. |
C | Perception distance, slowing distance, and braking distance. |
D | Observation distance, reaction distance, and slowing distance. |
← | List | → |
1 | 2 | 3 | 4 | 5 |
6 | 7 | 8 | 9 | 10 |
11 | 12 | 13 | 14 | 15 |
16 | 17 | 18 | 19 | 20 |
21 | 22 | 23 | 24 | 25 |
26 | 27 | 28 | 29 | 30 |
31 | 32 | 33 | 34 | 35 |
36 | 37 | 38 | 39 | 40 |
41 | 42 | 43 | 44 | 45 |
46 | 47 | 48 | 49 | 50 |
End |
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