220-1202 Practice Question: A technician is replacing the thermal paste on a…

Answer analysis

Option-by-option breakdown

For each option: why learners choose it and why it is or isn't the right answer here.

• ✗

  The CPU may be damaged by electrostatic discharge (ESD).

  Why it's wrong here

  While electrostatic discharge (ESD) is a significant risk when handling sensitive electronic components like a CPU, the act of touching the contacts with bare fingers primarily introduces contaminants rather than directly causing ESD damage. ESD typically occurs when there is a sudden transfer of static electricity from a charged body (like a person) to a less charged or grounded object, often through improper grounding techniques during handling. Although a person could be statically charged, the immediate and most direct consequence of bare finger contact with CPU pins or pads is the transfer of oils and debris.

• ✗

  The CPU may overheat due to improper thermal paste application.

  Why it's wrong here

  Overheating of the CPU is a direct consequence of an improperly applied or insufficient amount of thermal paste, which impedes efficient heat transfer from the CPU's integrated heat spreader (IHS) to the heatsink. However, the act of touching the CPU's electrical contacts with bare fingers does not directly affect the thermal paste application or its efficacy. The primary concern when touching contacts is the introduction of foreign substances, not a change in the thermal interface material's performance.

• ✓

  The CPU contacts may become contaminated with oils from the skin.

  Why this is correct

  Human skin naturally produces oils, salts, and other residues that can easily transfer to the delicate electrical contacts of a CPU when touched with bare fingers. These contaminants can create an insulating layer, impeding proper electrical conductivity between the CPU and its socket. Over time, these residues can also lead to corrosion of the metallic contacts, resulting in intermittent connections, system instability, or complete failure of the CPU or motherboard.

• ✗

  The CPU may be physically damaged by the pressure of the touch.

  Why it's wrong here

  While excessive force or improper handling can certainly cause physical damage, such as bent pins on a Pin Grid Array (PGA) CPU or scratches on the contact pads of a Land Grid Array (LGA) CPU, a light touch from bare fingers is highly unlikely to exert sufficient pressure to cause structural damage. The primary vulnerability of CPU contacts to a light touch is not physical deformation but rather the deposition of microscopic contaminants that interfere with electrical pathways.

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