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General Knowledge Practice Question 50

RequiredGeneral Knowledge · Question 50

Your medical examiner's certificate generally must be renewed at least every:

• A6 months
• B12 months
• C24 months
• D60 months

Correct answer: C. 24 months

Why: DOT medical certificates are valid for up to 24 months. Drivers with conditions like hypertension or sleep apnea may receive shorter cards (3, 6, or 12 months).

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

• Q22. A second DUI conviction in a CDL results in:
• Q35. On wet roads, you should reduce speed by approximately:
• Q48. The Working Load Limit (WLL) of a tiedown chain assembly is:
• Q62. The CDL must be carried by the driver:
• Q10. You should check your mirrors approximately every:

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.