Mobile Devices Exam Answers

Extended Mock Exam Section 1: Mobile Devices (15%) 1. Which type of memory is typically used in laptops? • A. DIMM • B. ECC • C. SO-DIMM • D. DDR4 Answer: C 2. What is the purpose of a laptop’s inverter? • A. Convert DC to AC for backlight • B. Convert AC to DC for the processor • C. Regulate battery power • D. Amplify Wi-Fi signals Answer: A 3. Which display technology is known for its deep blacks and high contrast ratio? • A. IPS • B. TN • C. OLED • D. LCD Answer: C 4. What is the first step in replacing a laptop’s hard drive? • A. Remove the battery • B. Format the new hard drive • C. Remove the display • D. Disconnect the keyboard Answer: A 5. What type of USB connector is most common on modern smartphones for charging and data transfer? • A. USB-A • B. USB-C • C. Mini-USB • D. Micro-USB Answer: B 6. A user reports their laptop display is dim even when plugged in. What is the most likely cause? • A. Incorrect brightness settings • B. Faulty power supply • C. Failing inverter • D. Overheated CPU Answer: C 7. Which of the following is a characteristic of eMMC storage? • A. Slower than SSDs • B. Larger capacity than SSDs • C. External storage format • D. Provides faster read speeds than NVMe SSD Answer: A 8. Which technology allows smartphones to make payments by tapping on a terminal? • A. Bluetooth • B. NFC • C. Wi-Fi Direct • D. IR Answer: B 9. What would be the first step to troubleshoot if a laptop’s keyboard stops working? • A. Replace the keyboard • B. Update keyboard drivers • C. Test with an external keyboard • D. Replace the motherboard Answer: C 10. Which port is commonly used for docking stations on modern laptops? • A. USB-C • B. HDMI • C. VGA • D. Ethernet Answer: A 11. What is the most common type of battery in mobile devices? • A. NiCad • B. Lithium-ion • C. Nickel-metal hydride • D. Alkaline Answer: B 12. Which of the following issues can a factory reset resolve on a mobile device? • A. Broken screen • B. Software corruption • C. Dead battery • D. Physically damaged speakers Answer: B 13. Which accessory connects a smartphone to an external display? • A. USB-C to HDMI adapter • B. Micro-USB to VGA cable • C. USB-A to DisplayPort adapter • D. Thunderbolt to VGA adapter Answer: A 14. A user reports slow data speeds on their phone when on mobile data. Which of the following is the first step? • A. Restart the phone • B. Replace the SIM card • C. Reset network settings • D. Contact the mobile carrier Answer: A 15. What is the first step to replace a smartphone screen? • A. Remove the back panel • B. Power off the device • C. Disconnect the battery • D. Remove the screen protector Answer: B Section 2: Networking (20%) 16. What protocol is used to retrieve emails from a remote server to a local client? • A. FTP • B. SMTP • C. POP3 • D. RDP Answer: C 17. Which of the following describes a characteristic of UDP? • A. Connection-oriented • B. Higher overhead than TCP • C. Connectionless • D. Error-correcting protocol Answer: C 18. What is the default port for HTTPS? • A. 80 • B. 443 • C. 110 • D. 21 Answer: B 19. Which wireless standard operates only on the 2.4 GHz band? • A. 802.11n • B. 802.11g • C. 802.11ac • D. 802.11ax Answer: B 20. A user cannot connect to a website. You ping the site and receive an IP address. Which layer of the OSI model is likely functioning correctly? • A. Application • B. Data Link • C. Network • D. Presentation Answer: C 21. Which of the following IP addresses is valid for a private network? • A. 172.16.20.5 • B. 192.200.1.5 • C. 200.100.100.5 • D. 127.0.0.1 Answer: A 22. Which technology allows a network administrator to prioritize certain types of traffic for smoother performance? • A. QoS • B. DNS • C. NAT • D. VPN Answer: A 23. What type of cable is required to achieve 10 Gbps speeds over a short distance? • A. Cat5e • B. Cat6a • C. Cat7 • D. Fiber optic Answer: B 24. Which protocol is responsible for dynamically assigning IP addresses to devices on a network? • A. DNS • B. DHCP • C. FTP • D. ARP Answer: B 25. What is the maximum theoretical speed of a 802.11n Wi-Fi connection? • A. 54 Mbps • B. 600 Mbps • C. 1.3 Gbps • D. 3.46 Gbps Answer: B 26. A user can access local network resources but cannot browse the web. Which of the following is most likely the problem? • A. The router is misconfigured • B. The user’s DNS settings are incorrect • C. The device is using an incorrect IP address • D. The user’s NIC is faulty Answer: B 27. Which of the following describes the purpose of a VPN? • A. To encrypt all network traffic over a secure connection • B. To monitor network traffic • C. To prevent DoS attacks • D. To allocate IP addresses dynamically Answer: A 28. Which of the following network types has the largest coverage area? • A. PAN • B. LAN • C. MAN • D. WAN Answer: D 29. A technician is setting up a wireless network for a small office. What encryption method should be used to secure the network? • A. WEP • B. WPA • C. WPA2 • D. RADIUS Answer: C 30. What is the purpose of NAT (Network Address Translation)? • A. Translate IP addresses between private and public networks • B. Assign MAC addresses to devices on the network • C. Prioritize network traffic • D. Provide redundancy in case of a network failure Answer: A Section 3: Hardware (25%) 31. Which connector is used to provide power to modern motherboards? • A. Molex • B. 24-pin ATX • C. 6-pin PCIe • D. SATA power connector Answer: B 32. Which of the following is an advantage of SSDs over HDDs? • A. Higher storage capacity • B. Greater durability • C. Lower price per GB • D. Longer lifespan Answer: B 33. Which of the following components is part of a CPU’s architecture? • A. Northbridge • B. ALU (Arithmetic Logic Unit) • C. DIMM • D. GPU Answer: B 34. Which RAID level provides redundancy and allows for the replacement of a failed drive without losing data? • A. RAID 0 • B. RAID 1 • C. RAID 5 • D. RAID 6 Answer: C 35. Which type of memory is often used in cache for the CPU? • A. DRAM • B. SRAM • C. ECC RAM • D. VRAM Answer: B 36. Which of the following connector types is commonly used for analog video output? • A. HDMI • B. DisplayPort • C. VGA • D. DVI Answer: C 37. What voltage is provided by the yellow wire in a standard ATX power supply? • A. +3.3V • B. +5V • C. +12V • D. -12V Answer: C 38. Which expansion card is most commonly used to add Wi-Fi connectivity to a desktop computer? • A. Sound card • B. Network interface card (NIC) • C. Video card • D. RAID controller Answer: B 39. What is the primary function of a heat sink in a computer? • A. Power regulation • B. Voltage conversion • C. Cooling the CPU or GPU • D. Reducing electromagnetic interference Answer: C 40. What type of printer uses a fuser to adhere toner to paper? • A. Inkjet • B. Laser • C. Thermal • D. Dot matrix Answer: B Section 4: Virtualization and Cloud Computing (11%) 41. Which cloud model provides users with computing infrastructure such as virtual machines and storage? • A. IaaS • B. SaaS • C. PaaS • D. XaaS Answer: A 42. Which of the following is a benefit of virtualization? • A. Enhanced physical security • B. Better network throughput • C. Reduced hardware costs • D. Faster processor speeds Answer: C 43. Which type of hypervisor is installed directly on the hardware of a host machine? • A. Type 1 • B. Type 2 • C. Hosted hypervisor • D. Emulated hypervisor Answer: A Section 5: Hardware and Network Troubleshooting (29%) 44. A computer is making a clicking noise, and files are becoming inaccessible. What is the most likely cause? • A. Failing power supply • B. Overheating CPU • C. Faulty hard drive • D. Failing RAM Answer: C 45. What is the final step in the CompTIA troubleshooting methodology? • A. Test the theory • B. Verify functionality • C. Document findings • D. Implement a solution Answer: C