CMT Certified Mobile Technician — Questions and Answers

Question 1: What does OTA stand for in the context of mobile software updates?

Original Transmission Authorization
Over-the-Air, meaning the update is downloaded and installed wirelessly without a PC (Correct answer)
Offline Transfer Application
Operating Temperature Adjustment

Correct answer: Over-the-Air, meaning the update is downloaded and installed wirelessly without a PC

OTA updates allow devices to update their OS or firmware wirelessly without requiring a computer connection.

Question 2: What is the primary purpose of maintaining detailed repair logs for each device serviced?

To register repairs with device manufacturers
To meet OSHA equipment standards only
To track employee hours
To provide an audit trail, support warranty claims, ensure quality control, and protect against liability (Correct answer)

Correct answer: To provide an audit trail, support warranty claims, ensure quality control, and protect against liability

Comprehensive repair logs are essential for resolving disputes, supporting warranties, and demonstrating professional due diligence.

Question 3: What is meant by 'conflict of interest' in a mobile repair business context?

A situation where a technician's personal interests could improperly influence their professional decisions (Correct answer)
A parts supply shortage
A disagreement between two customers
A scheduling conflict between technicians

Correct answer: A situation where a technician's personal interests could improperly influence their professional decisions

Recognizing and disclosing conflicts of interest is essential to maintaining professional integrity.

Question 4: Which charging behavior is recommended to maximize long-term Li-Ion battery health?

Always use the fastest available charger to minimize time at high charge states
Charge only when battery reaches 0% and always charge to 100%
Charge in short bursts of 5–10 minutes multiple times per day
Keep battery between 20–80% charge and avoid prolonged exposure to high heat while charging (Correct answer)

Correct answer: Keep battery between 20–80% charge and avoid prolonged exposure to high heat while charging

Keeping Li-Ion batteries between 20–80% charge and avoiding heat minimizes electrochemical stress, reducing capacity degradation over hundreds of charge cycles.

Question 5: What is the purpose of a UV sanitizing device marketed for mobile phones?

It detects counterfeit accessories
UV-C light kills surface bacteria and viruses on the device exterior without using liquids that could damage the phone (Correct answer)
It charges the phone wirelessly via UV light
It repairs UV damage to screens

Correct answer: UV-C light kills surface bacteria and viruses on the device exterior without using liquids that could damage the phone

UV-C sanitizers reduce surface microbial contamination, which is relevant given how frequently phones are handled.

Question 6: What does the term 'data minimization' mean in the context of mobile app privacy standards?

Collecting only the data strictly necessary for the app's stated purpose (Correct answer)
Encrypting data to minimize its readable footprint
Compressing user data to reduce storage size
Deleting old user data after 30 days

Correct answer: Collecting only the data strictly necessary for the app's stated purpose

Data minimization is a core GDPR and privacy principle requiring apps to collect only data that is necessary for their specific function.

Question 7: A technician is repairing a water-damaged phone. Which action should be performed FIRST after disassembly?

Rinse with isopropyl alcohol (90%+) and inspect for corrosion (Correct answer)
Power on to test which components work
Apply heat to dry the board
Replace the battery immediately

Correct answer: Rinse with isopropyl alcohol (90%+) and inspect for corrosion

Rinsing with high-purity isopropyl alcohol removes mineral deposits from water and stops ongoing corrosion before further damage occurs.

Question 8: A repair shop finds a device abandoned after 90 days of no customer contact. What is the appropriate action?

Donate it to charity without documentation
Keep it as store property with no further steps
Immediately resell or discard the device
Follow state abandoned property laws, which typically require documented contact attempts before disposal (Correct answer)

Correct answer: Follow state abandoned property laws, which typically require documented contact attempts before disposal

Abandoned property laws vary by state but generally require documented outreach attempts before any disposition.

Question 9: What is the primary purpose of maintaining a written repair agreement with each customer?

To legally define the scope of work, pricing, and liability for both parties (Correct answer)
To track inventory levels
To register the repair with the manufacturer
To satisfy IRS audit requirements only

Correct answer: To legally define the scope of work, pricing, and liability for both parties

A signed repair agreement protects both the technician and customer by documenting mutual expectations.

Question 10: A customer's app keeps crashing on iOS. What is the recommended first troubleshooting step?

Replace the logic board
Reinstall iOS
Restore the device to factory settings
Force-close the app and relaunch it, then check for app updates (Correct answer)

Correct answer: Force-close the app and relaunch it, then check for app updates

Force-closing and checking for updates resolves the majority of app crashes with minimal disruption.

Question 11: What does the term 'mobile device chipset' refer to?

The set of integrated circuits that process data (Correct answer)
The power supply unit
The screen display
The device’s internal storage

Correct answer: The set of integrated circuits that process data

A mobile device chipset, often referred to as a System-on-a-Chip (SoC), is a collection of integrated circuits designed to work together to manage and process data within the device. It typically includes the central processing unit (CPU), graphics processing unit (GPU), memory controller, and other essential components. This integrated set of circuits acts as the device's central control unit, enabling communication between various hardware parts and executing instructions.

Question 12: What is 'shoulder surfing' in the context of mobile device security?

An attacker remotely capturing a device's screen via malware
Installing a keylogger through a rogue charging cable
Intercepting Bluetooth signals to read messages
Physically observing a user's screen or keypad to steal PINs or passwords (Correct answer)

Correct answer: Physically observing a user's screen or keypad to steal PINs or passwords

Shoulder surfing is a low-tech social engineering technique where an attacker observes a victim's device screen to steal credentials or sensitive information.

Question 13: What is the benefit of using a standardized checklist when completing a repair?

It replaces the need for customer communication
It slows down the repair process unnecessarily
It is only required for warranty repairs
It ensures consistent quality and provides documentation of steps completed (Correct answer)

Correct answer: It ensures consistent quality and provides documentation of steps completed

Checklists reduce errors, ensure quality control, and provide a record of completed work.

Question 14: Which factor most accelerates Li-Ion battery degradation over time?

Enabling dark mode on OLED displays
Consistently charging to 100% and discharging to 0% combined with high heat exposure (Correct answer)
Frequently using the device while it charges
Using third-party USB cables with original chargers

Correct answer: Consistently charging to 100% and discharging to 0% combined with high heat exposure

Extreme charge levels (keeping the battery at 100% or near 0%) combined with heat are the primary accelerators of Li-Ion capacity degradation.

Question 15: What is the purpose of using UV-curable adhesive (LOCA) when bonding a replacement display assembly?

It fills air gaps between the glass and display panel to improve optical clarity and bond strength (Correct answer)
It seals the device against water ingress at the charging port
It acts as a thermal interface material to cool the display
It prevents the digitizer from generating ghost touches

Correct answer: It fills air gaps between the glass and display panel to improve optical clarity and bond strength

LOCA eliminates the air gap that reduces brightness and causes glare, bonding glass to panel for improved display quality and structural integrity.

Question 16: What is the significance of a device's build number in Android?

It identifies the specific firmware version installed, critical for applying correct updates or patches (Correct answer)
It is the device's unique hardware ID
It shows the battery health percentage
It indicates carrier unlock status

Correct answer: It identifies the specific firmware version installed, critical for applying correct updates or patches

The build number pinpoints the exact OS version and patch level, essential for targeted troubleshooting.

Question 17: What is 'trickle charging' in the context of mobile battery management?

Charging at maximum current until 100% is reached
Charging multiple devices simultaneously at reduced speed
A slow, low-current charge applied to maintain a fully charged battery or recover a deeply discharged cell (Correct answer)
A fast-charge protocol that alternates between high and low current

Correct answer: A slow, low-current charge applied to maintain a fully charged battery or recover a deeply discharged cell

Trickle charging delivers a small, continuous current to maintain full charge without overcharging, and can safely recover batteries that have been deeply discharged.

Question 18: Why is it important to obtain customer authorization before performing additional repairs discovered during service?

To delay the repair process
To upsell unnecessary services
To meet state licensing requirements only
To ensure the customer agrees to additional costs and maintains trust (Correct answer)

Correct answer: To ensure the customer agrees to additional costs and maintains trust

Unauthorized work can lead to billing disputes and damage the shop's reputation.

Question 19: A technician replaces a phone's Wi-Fi antenna flex cable. After reassembly, the device connects to 2.4 GHz but not 5 GHz. What is the most likely issue?

Wrong APN configured
Operating system needs update
Router 5 GHz band is disabled
Only one antenna connected — 5 GHz requires dual-band antenna (Correct answer)

Correct answer: Only one antenna connected — 5 GHz requires dual-band antenna

Many phones use separate antenna paths for 2.4 GHz and 5 GHz; if the secondary antenna or its connector is missed during reassembly, 5 GHz fails.

Question 20: A phone shows ghost touches (screen inputs with no physical contact) after a screen replacement. What is the most likely cause?

Software malware causing false inputs
Worn volume buttons
Poor quality or incompatible digitizer, or digitizer flex cable not fully seated (Correct answer)
Failed Bluetooth module

Correct answer: Poor quality or incompatible digitizer, or digitizer flex cable not fully seated

An incompatible or poorly seated digitizer generates false electrical signals interpreted as touch inputs by the controller.

Question 21: A technician performing a screen replacement must boot the device into a diagnostic mode. Which security feature could prevent unauthorized access to the device during this process?

Auto-brightness setting
NFC disable
Airplane mode
Secure Boot / Bootloader lock (Correct answer)

Correct answer: Secure Boot / Bootloader lock

A locked bootloader enforces Secure Boot, preventing the device from booting unauthorized or modified OS images during repair.

Question 22: Under what circumstances can a mobile repair technician legally access data on a customer's device?

Never under any circumstances
Only to the extent necessary to diagnose and repair the reported issue, with customer consent (Correct answer)
To back up the device without being asked
Freely, since the device is in their possession

Correct answer: Only to the extent necessary to diagnose and repair the reported issue, with customer consent

Accessing customer data beyond what is needed for the repair may violate privacy laws and professional ethics.

Question 23: A technician is using a USB-C cable to transfer a customer's data during repair. Which attack vector should the technician be aware of if using an untrusted cable?

BadUSB attack where the cable contains embedded malicious firmware (Correct answer)
Bluetooth sniffing via the cable's port
Radio frequency interception
HDMI signal spoofing

Correct answer: BadUSB attack where the cable contains embedded malicious firmware

BadUSB attacks embed malicious firmware in a cable or USB device that can execute commands, inject keystrokes, or install malware when plugged in.

Question 24: What is the typical lifespan of a Li-Ion smartphone battery measured in charge cycles before it degrades to approximately 80% of original capacity?

300–500 cycles (Correct answer)
5,000+ cycles
50–100 cycles
1,000–2,000 cycles

Correct answer: 300–500 cycles

Li-Ion batteries in smartphones typically retain about 80% of their original capacity after 300–500 full charge cycles under normal usage conditions.

Question 25: A smartphone's GPS is inaccurate indoors but accurate outdoors. What is the most likely explanation?

The device OS needs a factory reset
GPS relies on line-of-sight to satellites and is blocked by structures (Correct answer)
Faulty GPS antenna requiring replacement
Cellular data is disabled, cutting off GPS

Correct 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.

Question 26: When a customer asks about an external battery pack (power bank), which specification MOST affects charging speed for their phone?

The color and weight of the power bank
Whether it has a built-in flashlight
The power bank's output wattage and whether it supports the phone's fast-charge protocol (e.g., USB-PD, Qualcomm Quick Charge) (Correct answer)
The number of USB-A ports

Correct answer: The power bank's output wattage and whether it supports the phone's fast-charge protocol (e.g., USB-PD, Qualcomm Quick Charge)

Protocol compatibility between the power bank output and device input determines whether fast charging is actually achieved.

Question 27: When updating iOS on a customer's device, what should the technician verify first?

That all apps have been deleted
That the device has sufficient storage and battery charge (at least 50%) before updating (Correct answer)
That the SIM card is removed
That the device is connected to 5G

Correct answer: That the device has sufficient storage and battery charge (at least 50%) before updating

Insufficient storage or battery during an iOS update can cause the update to fail or brick the device.

Question 28: A repair estimate turns out to be significantly higher than quoted. You should:

Contact the customer immediately with the revised estimate before proceeding (Correct answer)
Complete the repair and present the new total at pickup
Absorb the additional cost without disclosure
Cancel the repair without notifying the customer

Correct answer: Contact the customer immediately with the revised estimate before proceeding

Prompt disclosure of cost changes respects the customer's financial decisions and maintains ethical standards.

Question 29: What is the role of the PMU (Power Management Unit) in a mobile device?

Regulates and distributes voltage to all device components (Correct answer)
Controls the cellular antenna switching
Handles audio amplification for the speakers
Manages screen brightness via ambient light data

Correct answer: Regulates and distributes voltage to all device components

The PMU converts and regulates battery voltage into the precise power levels required by the CPU, display, radios, and other components.

Question 30: How does NFC (Near Field Communication) work in mobile devices?

It improves battery life
It increases signal strength
It allows data exchange and contactless payments (Correct answer)
It enables remote control functions

Correct answer: It allows data exchange and contactless payments

NFC (Near Field Communication) is a short-range wireless technology that enables two devices to communicate when brought within a few centimeters of each other. In mobile devices, its primary function is to facilitate quick data exchange, such as sharing files or pairing Bluetooth devices, and most notably, to enable secure contactless payments by simply tapping the device on a compatible reader.

Question 31: A customer's iPhone Face ID stopped working after a third-party screen replacement. What explains this?

Face ID's TrueDepth camera module is paired to the logic board and transfers with the original screen (Correct answer)
Third-party screens use different refresh rates
Third-party screens block infrared light
The battery needs replacement

Correct answer: Face ID's TrueDepth camera module is paired to the logic board and transfers with the original screen

Apple's TrueDepth camera system is cryptographically paired to the original logic board; the sensor assembly must transfer from the original screen to restore Face ID.

Question 32: A technician notices a colleague billing customers for unnecessary screen protector installations. The correct response is to:

Ignore it since it is not your responsibility
Warn customers yourself directly
Report the behavior to management or the shop owner, as it constitutes fraud (Correct answer)
Do the same to stay competitive

Correct answer: Report the behavior to management or the shop owner, as it constitutes fraud

Fraudulent billing by colleagues must be escalated through proper channels to protect the business and customers.

Question 33: Which 5G spectrum band provides the fastest speeds but the shortest range and worst building penetration?

Low-band 600–900 MHz
C-band 3.5 GHz
Sub-6 GHz (FR1)
mmWave (FR2) 24–100 GHz (Correct answer)

Correct answer: mmWave (FR2) 24–100 GHz

mmWave (millimeter wave) 5G offers multi-gigabit speeds but has very short range (hundreds of meters) and is blocked by walls and even rain.

Question 34: What is the purpose of the IMSI stored on a SIM card?

Controls which Wi-Fi networks the device can join
Encrypts all outgoing SMS messages
Uniquely identifies the subscriber to the mobile network (Correct answer)
Stores the phone's hardware serial number

Correct answer: Uniquely identifies the subscriber to the mobile network

The International Mobile Subscriber Identity (IMSI) is a unique number that identifies a subscriber and their home network to the carrier.

Question 35: Why should technicians be cautious when disabling system apps on Android?

Disabling critical system apps can cause instability, crashes, or loss of essential device functions (Correct answer)
It permanently deletes the apps from all devices on the account
It voids the physical warranty only
System apps cannot be disabled on any Android device

Correct answer: Disabling critical system apps can cause instability, crashes, or loss of essential device functions

Some system apps are dependencies for other services; disabling them can break core functionality.

Question 36: What is the primary advantage of Lithium-Polymer (LiPo) batteries over standard Li-Ion batteries in mobile devices?

Higher voltage output
Flexible form factor allowing thinner device designs (Correct answer)
Faster charge times at all temperatures
Lower manufacturing cost

Correct answer: Flexible form factor allowing thinner device designs

LiPo batteries use a polymer electrolyte instead of liquid, allowing them to be manufactured in flexible, thin, and custom shapes that enable slimmer device designs.

Question 37: A repair shop must comply with which regulation when disposing of lithium-ion batteries?

EPA and state hazardous waste regulations, as lithium batteries are classified as hazardous materials (Correct answer)
FTC advertising regulations
OSHA ergonomics standards
FCC Part 15 regulations only

Correct answer: EPA and state hazardous waste regulations, as lithium batteries are classified as hazardous materials

Lithium batteries contain materials regulated as hazardous waste and must be disposed of through certified recyclers.

Question 38: What is the primary difference between iOS and Android regarding app installation from third-party sources?

Both allow unrestricted third-party installs
iOS allows sideloading; Android does not
Neither platform allows third-party installations
Android allows sideloading APKs; iOS restricts installs to the App Store by default (Correct answer)

Correct answer: Android allows sideloading APKs; iOS restricts installs to the App Store by default

Android's open architecture permits APK sideloading, while Apple's iOS enforces App Store distribution by default.

Question 39: After replacing a phone battery, the device reports 0% charge and shuts down immediately even though the new battery is fully charged. What should you check first?

Inspect the battery connector pins and re-seat the connector (Correct answer)
Perform a factory reset
Re-flash the bootloader
Replace the charging port

Correct answer: Inspect the battery connector pins and re-seat the connector

A loose or misaligned battery connector prevents proper voltage reading and causes the device to shut down as if the battery is dead.

Question 40: What is the function of carrier aggregation in LTE-Advanced and 5G networks?

Bonds multiple frequency bands together to increase total bandwidth (Correct answer)
Combines signals from multiple towers to increase reliability
Reduces latency by bypassing the core network
Switches between carriers automatically for best price

Correct answer: Bonds multiple frequency bands together to increase total bandwidth

Carrier aggregation combines two or more LTE/5G frequency bands simultaneously, effectively multiplying available bandwidth for higher speeds.

Question 41: Which storage interface standard offers faster read/write speeds on modern flagship smartphones compared to eMMC?

USB 2.0
microSD
NFC
UFS (Universal Flash Storage) (Correct answer)

Correct answer: UFS (Universal Flash Storage)

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

Question 42: A customer's phone consistently overheats when using a particular case. What is the most likely cause?

The case interferes with GPS signals
The case insulates the device and traps heat generated during processing or charging, preventing normal thermal dissipation (Correct answer)
The case is emitting radio frequency radiation
The case activates always-on display mode

Correct answer: The case insulates the device and traps heat generated during processing or charging, preventing normal thermal dissipation

Smartphones rely on convective heat loss through the chassis; poorly ventilated cases reduce thermal dissipation.

Question 43: Which component in a mobile device is responsible for wireless communication?

Motherboard
Wireless communication module (Correct answer)
Processor
Display screen

Correct answer: Wireless communication module

The wireless communication module is the dedicated component within a mobile device responsible for enabling various forms of wireless connectivity. This module integrates technologies such as Wi-Fi, Bluetooth, and cellular (2G/3G/4G/5G) radios, allowing the device to connect to networks, access the internet, and communicate with other devices without physical cables. It is essential for all modern mobile connectivity features.

Question 44: Which method is MOST effective for communicating repair status to a busy customer?

Send a text or email update at key milestones without requiring a callback (Correct answer)
Post updates only on a website
Require the customer to call for all updates
Only communicate when the device is ready

Correct answer: Send a text or email update at key milestones without requiring a callback

Proactive updates via the customer's preferred channel reduce inbound calls and improve satisfaction.

Question 45: What does 'cache partition wipe' accomplish on Android?

It unlinks the Google account
It removes all user apps and data
It resets network settings
It clears temporary system files that can cause glitches without deleting user data (Correct answer)

Correct answer: It clears temporary system files that can cause glitches without deleting user data

Wiping the cache partition removes corrupted temp files and often resolves post-update performance issues.

Question 46: Which memory type in a mobile device retains data without power and stores the operating system?

SRAM cache
DRAM
NAND Flash (eMMC/UFS) (Correct answer)
LPDDR5 RAM

Correct answer: NAND Flash (eMMC/UFS)

NAND Flash (eMMC or UFS) is non-volatile storage that retains data without power and holds the OS and user data.

Question 47: How can you resolve a mobile device that is not connecting to Wi-Fi?

Replace the Wi-Fi card
Change the device's operating system (Correct answer)
Restart the device and reconnect to Wi-Fi
Use mobile data instead

Correct answer: Change the device's operating system

If a mobile device is not connecting to Wi-Fi, and basic troubleshooting like restarting the device and router fails, a deeper software issue might be at play. In such cases, reinstalling or updating the device's operating system (which can be considered 'changing' its state) can resolve underlying software bugs or corrupted network drivers. This drastic step is usually a last resort for persistent connectivity problems.

Question 48: What does the term 'roaming' mean in mobile networking?

Connecting to a partner carrier's network outside your home coverage area (Correct answer)
Switching between 4G and 5G automatically
Using Wi-Fi instead of cellular data
Enabling hotspot mode on a device

Correct answer: Connecting to a partner carrier's network outside your home coverage area

Roaming occurs when a device connects to a partner carrier's infrastructure because the home carrier has no coverage in that area.

Question 49: A phone's proximity sensor fails after a screen replacement, causing the screen to stay on during calls. Where is the proximity sensor typically located on modern smartphones?

On the back of the motherboard
Integrated in or near the front-facing camera/earpiece assembly behind the screen (Correct answer)
Inside the USB-C port assembly
Inside the battery compartment

Correct answer: Integrated in or near the front-facing camera/earpiece assembly behind the screen

Most smartphones integrate the proximity sensor into the front sensor bar or earpiece assembly, which can be damaged or misaligned during screen replacement.

Question 50: After a water damage repair, a device boots to the OS but has no cellular signal. All other functions work. What component is most suspect?

Cellular baseband module or its antenna connections (Correct answer)
Front camera
NAND flash chip
Touchscreen digitizer

Correct answer: Cellular baseband module or its antenna connections

Water damage often corrodes the baseband processor or antenna connector pads, eliminating cellular function while leaving Wi-Fi and other features intact.

Question 51: What differentiates a protective case rated for 'military standard' (MIL-STD-810G)?

It provides waterproofing to 30 meters
It has been tested to withstand specific conditions including drop, vibration, humidity, and temperature extremes (Correct answer)
It is manufactured by a military contractor only
It includes built-in encryption

Correct answer: It has been tested to withstand specific conditions including drop, vibration, humidity, and temperature extremes

MIL-STD-810G certification indicates the case has passed a series of environmental and mechanical stress tests.

Question 52: A device shows 'No SIM Card Detected' after a repair. The SIM card and tray are correctly installed. What should you check?

Inspect and re-seat the SIM card reader connector on the motherboard (Correct answer)
Re-flash carrier firmware
Factory reset the device
Replace the battery

Correct answer: Inspect and re-seat the SIM card reader connector on the motherboard

Repairs often disturb the SIM reader connector; a loose connector causes the device to fail to detect a properly inserted SIM.

Question 53: A shop receives a device for liquid damage repair that contains sensitive health data. Under HIPAA, what obligation does the repair shop have?

None, HIPAA only applies to healthcare providers
The shop must upload the data to a HIPAA-compliant cloud
The shop must immediately wipe the device before repair
The shop must sign a Business Associate Agreement (BAA) and handle data appropriately (Correct answer)

Correct answer: The shop must sign a Business Associate Agreement (BAA) and handle data appropriately

Repair shops that handle devices containing protected health information (PHI) may qualify as business associates and must execute a BAA and follow HIPAA safeguards.

Question 54: A phone running Android cannot connect to any Wi-Fi network after a screen replacement. The technician notices the Wi-Fi MAC address shows 'unavailable.' What is the most likely cause?

iCloud activation lock
Wi-Fi chip damaged during repair or antenna cable disconnected (Correct answer)
Android OS corruption
Wrong Wi-Fi password saved

Correct answer: Wi-Fi chip damaged during repair or antenna cable disconnected

A missing or 'unavailable' MAC address after a repair indicates the Wi-Fi chip was damaged by ESD or heat, or the antenna/flex cable is disconnected.

Question 55: What is 'battery memory effect' and which battery chemistry is most susceptible to it?

Permanent capacity loss from overcharging; most common in Li-Ion
Voltage drop from age; most common in Lead-Acid
Reduced capacity from repeated partial discharges; most common in NiCd (Correct answer)
Swelling from heat exposure; most common in LiPo

Correct answer: Reduced capacity from repeated partial discharges; most common in NiCd

Memory effect occurs in Nickel-Cadmium batteries when they are repeatedly partially discharged before recharging, causing the battery to 'remember' the lower capacity.

Question 56: Which communication style is most effective when explaining a technical issue to a non-technical customer?

Use technical terminology to appear professional
Write a detailed technical report
Refer them to the manufacturer's manual
Use plain language and avoid jargon (Correct answer)

Correct answer: Use plain language and avoid jargon

Plain language ensures the customer understands the issue without feeling overwhelmed by technical terms.

Question 57: What is the purpose of Google's Find My Device service from a technician's perspective?

It allows remote lock, erase, and location tracking, which technicians must consider before repair (Correct answer)
It only tracks stolen devices for law enforcement
It backs up app data automatically
It is used to unlock bootloaders

Correct answer: It allows remote lock, erase, and location tracking, which technicians must consider before repair

Technicians need to know if Find My Device is enabled because it affects the ability to perform certain repairs and resets.

Question 58: Why are mobile devices generally smaller than desktop computers?

For aesthetic reasons
For portability and space efficiency (Correct answer)
To improve security
To increase processing speed

Correct answer: For portability and space efficiency

Mobile devices are designed to be significantly smaller than desktop computers primarily for portability and space efficiency. Their compact size allows users to easily carry them in pockets or bags, making them convenient for use on the go and in various environments. This design choice prioritizes user mobility and ease of handling over raw processing power or extensive expandability.

Question 59: Which type of attack involves an attacker intercepting communication between a mobile device and a Wi-Fi access point without either party knowing?

Man-in-the-middle (MitM) attack (Correct answer)
Brute force attack
SQL injection
Phishing attack

Correct answer: Man-in-the-middle (MitM) attack

A man-in-the-middle attack intercepts and potentially alters communications between two parties who believe they are communicating directly.

Question 60: A customer's phone consistently shows 20% battery remaining but then suddenly shuts off. What is the most likely cause?

Cellular radio interference with the battery management IC
Faulty charging port preventing proper voltage sensing
Battery capacity degradation causing inaccurate state-of-charge readings (Correct answer)
Operating system crash due to software corruption

Correct answer: Battery capacity degradation causing inaccurate state-of-charge readings

As Li-Ion batteries age and lose capacity, the fuel gauge calibration becomes inaccurate, causing the device to report incorrect remaining charge and shut down unexpectedly.

CMT Certified Mobile Technician

The CMT Certified Mobile Tech certification validates a technician's knowledge and skills in mobile device diagnostics, repair, hardware/software maintenance, and professional business practices. It covers the full scope of smartphone and tablet servicing from hardware repair to OS management and compliance.

Questions

90 min

Time Limit

70%

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