- A
A USB-C to USB-A adapter
Why wrong: USB-A does not carry video signals, so this adapter would not enable video output.
- B
A USB-C to HDMI adapter
This adapter uses the USB-C Alt Mode to transmit HDMI video and audio, making it compatible with the projector.
- C
A Bluetooth audio receiver
Why wrong: This only provides audio output and cannot transmit video to the projector.
- D
A wireless HDMI dongle
Why wrong: Wireless HDMI requires both transmitter and receiver; this scenario lacks a dedicated receiver, and the smartphone may not support wireless video output without additional hardware.
Question 211 of 1,020
220-1201 Mobile Device Accessories Practice Question
This 220-1201 practice question tests your understanding of mobile device accessories. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
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?
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.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
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 does not carry video signals, so this adapter would not enable video output.
- ✓
A USB-C to HDMI adapter
Why this is correct
This adapter uses the USB-C Alt Mode to transmit HDMI video and audio, making it compatible with the projector.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
A Bluetooth audio receiver
Why it's wrong here
This only provides audio output and cannot transmit video to the projector.
- ✗
A wireless HDMI dongle
Why it's wrong here
Wireless HDMI requires both transmitter and receiver; this scenario lacks a dedicated receiver, and the smartphone may not support wireless video output without additional hardware.
Common exam traps
Common exam trap: answer the scenario, not the keyword
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.
Trap categories for this question
Command / output trap
USB-A does not carry video signals, so this adapter would not enable video output.
Scenario analysis trap
Wireless HDMI requires both transmitter and receiver; this scenario lacks a dedicated receiver, and the smartphone may not support wireless video output without additional hardware.
Detailed technical explanation
How to think about this question
DisplayPort Alt Mode encapsulates DisplayPort signaling over the USB-C cable's SuperSpeed lanes, allowing simultaneous video, data, and power delivery. The USB-C to HDMI adapter must include a DisplayPort to HDMI protocol converter (often using a chip like the Parade PS176 or similar) to handle the signal translation and HDCP compliance. In practice, some adapters may not support all HDMI versions or resolutions, so users should verify the adapter's rated bandwidth (e.g., HDMI 2.0 for 4K@60Hz) matches the projector's capabilities.
KKey Concepts to Remember
- Read the scenario before looking for a memorised answer.
- Find the constraint that changes the correct option.
- Eliminate answers that are true in general but not in this case.
TExam Day Tips
- Watch for words such as best, first, most likely and least administrative effort.
- Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A practitioner preparing for the 220-1201 exam encounters this exact type of scenario on the job. The correct answer here is not the most general option — it is the best answer for the specific constraint described. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Real exam questions reward reading the full scenario before eliminating options, because the constraint defines which answer fits.
What to study next
Got this wrong? Here's your next step.
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FAQ
Questions learners often ask
What does this 220-1201 question test?
Mobile Device Accessories — This question tests Mobile Device Accessories — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: 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.
What should I do if I get this 220-1201 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Last reviewed: Jul 4, 2026
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