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General Knowledge Practice Question 61

RequiredGeneral Knowledge · Question 61

Minimum tread depth on non-steer tires is:

• A1/32 inch
• B2/32 inch
• C4/32 inch
• D8/32 inch

Correct answer: B. 2/32 inch

Why: Non-steering tires must have at least 2/32 inch tread depth in every major groove. Steer tires require deeper 4/32 inch tread because of the steering and load demands.

How this question fits the General test

FMCSA requires General Knowledge competency under 49 CFR 383.111 because every CDL holder operates a heavy vehicle in mixed traffic where situational judgment, pre-trip discipline, and emergency response routinely separate a safe trip from a fatal one.

Study technique for this topic

Read the FMCSA Model CDL Manual Section 2 cover to cover, then re-read it focused on numbers — speeds, distances, weights, and pressures. Use the practice questions in this category to drill those numeric thresholds until you can answer without hesitation.

Related General practice questions

• Q43. The best response to an aggressive driver is to:
• Q56. A perception distance is:
• Q5. The proper hand position on the steering wheel is:
• Q18. A 30-minute break is required after how many cumulative hours of driving?
• Q31. You must dim high beams to low beams when an oncoming vehicle is within:

Continue your CDL preparation

The General Knowledge portion of the CDL knowledge exam covers more than this single question. Use this site's full General Knowledge bank to drill every topic, then test yourself with one of our state-specific practice sets to confirm you are ready for the actual DMV exam in your state. Always check your state's CDL handbook for any local addenda before the test day.

If you are still building your overall CDL foundation, start with the General Knowledge bank — every CDL applicant must pass it — and then work outward to the endorsements you plan to add.