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220-1201 Practice Question: A customer wants to use a portable projector with…
A customer wants to use a portable projector with their smartphone for impromptu presentations. The smartphone has a USB-C port that supports DisplayPort Alt Mode. Which accessory will enable this connection?
⚠ Common exam trap
CompTIA A+ often tests the misconception that any USB-C adapter works for video, but only those explicitly supporting DisplayPort Alt Mode or containing the necessary conversion chip will output video to HDMI.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
A USB-C to HDMI adapter
The smartphone's USB-C port supports DisplayPort Alt Mode, which allows it to output a video signal over the USB-C connection. A USB-C to HDMI adapter converts this native DisplayPort signal into HDMI, enabling the portable projector to receive the video input. This is the standard accessory for connecting a USB-C device with DisplayPort Alt Mode to an HDMI display.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
A USB-C to USB-A adapter
Why it's wrong here
USB-A ports are fundamentally designed for data transfer and power delivery, not for carrying video signals. While USB-C is versatile and supports various Alternate Modes (Alt Modes) for video output, a USB-C to USB-A adapter only converts the physical connector type. It cannot magically enable video transmission over the USB-A standard, which lacks the necessary pinouts and protocols for display output, rendering it useless for connecting to a projector.
- ✓
A USB-C to HDMI adapter
Why this is correct
Many modern devices with USB-C ports support DisplayPort Alternate Mode (Alt Mode) or HDMI Alt Mode, allowing them to output high-definition video and audio signals directly over the USB-C connection. A USB-C to HDMI adapter specifically converts these Alt Mode signals into a standard HDMI format. This enables seamless connection to an HDMI-compatible portable projector, providing both visual and auditory content for presentations or media consumption.
- ✗
A Bluetooth audio receiver
Why it's wrong here
Bluetooth technology is a short-range wireless communication standard primarily optimized for low-bandwidth applications like audio streaming, file transfers, and connecting peripherals. It lacks the necessary bandwidth and dedicated protocols to transmit high-resolution video signals required for a projector. Therefore, a Bluetooth audio receiver would only facilitate sound output, leaving the projector without any visual input capability whatsoever.
- ✗
A wireless HDMI dongle
Why it's wrong here
A wireless HDMI dongle typically functions as a receiver that plugs into a display, expecting a corresponding transmitter to send video wirelessly. While some smartphones support wireless display technologies like Miracast or Chromecast, a generic "wireless HDMI dongle" often refers to a proprietary system. Without a dedicated, compatible wireless HDMI transmitter component, which is usually not built into a standard smartphone, this solution would not enable video projection.
Go deeper
Related to this question
Learn chapter
Mobile Device Types and Features
Key term
Smartphone
A smartphone is a handheld mobile device that combines cellular communication with computing capabilities, running an operating system that supports third-party applications, internet connectivity, and a touchscreen interface.
Key term
Universal Serial Bus Type C
A small, reversible 24-pin USB connector that supports high-speed data transfer, power delivery, and video output, used in modern devices.
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