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