Practice Test Geeks(CMT) Certified Mobile Tech Practice Test
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Device Hardware & Software Flashcards

7 cards from real CMT practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

Read the first 7 Device Hardware & Software flashcards as text

  1. What is the purpose of the IMEI number on a mobile device?

    Answer: It uniquely identifies the physical device on cellular networks

    The IMEI (International Mobile Equipment Identity) is a 15-digit number that uniquely identifies a mobile device on cellular networks.

  2. A smartphone's GPS is inaccurate indoors but accurate outdoors. What is the most likely explanation?

    Answer: GPS relies on line-of-sight to satellites and is blocked by structures

    GPS signals from satellites cannot penetrate most building materials, so indoor accuracy is naturally poor without assisted GPS (A-GPS) via Wi-Fi or cell data.

  3. Which storage interface standard offers faster read/write speeds on modern flagship smartphones compared to eMMC?

    Answer: UFS (Universal Flash Storage)

    UFS (Universal Flash Storage) uses a serial full-duplex interface enabling simultaneous reads and writes, significantly outperforming eMMC.

  4. After installing a third-party screen protector, a customer reports Face ID no longer works. What is the most likely cause?

    Answer: The protector is blocking the TrueDepth camera or IR sensor

    Face ID depends on the TrueDepth camera system and IR sensors; a protector covering or reflecting IR light prevents accurate face mapping.

  5. A technician notices swelling in a lithium-ion battery during a repair. What is the correct action?

    Answer: Safely remove the battery and follow hazardous materials disposal procedures

    A swollen Li-ion battery has dangerous gas buildup and must be carefully removed and disposed of through proper hazardous/e-waste channels.

  6. What does 'bootloader unlocking' allow a technician or advanced user to do on an Android device?

    Answer: Install unofficial operating systems or custom firmware

    Unlocking the bootloader removes the signature verification check, allowing installation of custom ROMs or unofficial OS builds.

  7. A device randomly restarts under heavy load. Which component is the most likely culprit?

    Answer: Battery unable to supply sufficient current under load

    A degraded battery with high internal resistance drops voltage sharply under heavy CPU/GPU load, triggering an automatic shutdown or restart.