This question-specific review guide is tied to the answer reasoning for a PracticeTestVault item. Use it after you answer the question so the review stays focused on what the prompt actually tested.
What this question is testing
Objective: Hardware
Prompt focus: A technician is asked to expand the memory in a desktop and finds DDR4 modules already installed. Which statement correctly describes installing the new modules?
Why the correct answer works
The new modules must also be DDR4 because the slot keying is generation specific
Memory slots are keyed per generation, so a DDR4 system must use DDR4 modules.
Why the tempting wrong answer fails
The tempting wrong answer usually loses because it skips the key condition, priority, or evidence in the prompt.
Plain-language takeaway
Memory generations such as DDR3, DDR4, and DDR5 are not interchangeable because each has a different notch position and electrical specification, and the slot is keyed to accept only that generation. A DDR4 motherboard requires DDR4 modules. Desktop DIMMs and laptop SODIMMs…
Simple analogy
Think of hardware like following a short checklist: identify the clue, confirm the rule, and then make the move that fits this exact scenario.
How to review it before a retake
- Underline the command word and name what the question is asking before rereading the choices.
- Compare the correct answer against the closest distractor and write the exact detail that separates them.
- Retest this objective with a fresh question without looking at the rationale first.