81. What is the primary function of an arithmetic logic unit (ALU)?
- a) Performs mathematical and logical operations
- b) Stores data permanently
- c) Manages network connections
- d) Displays graphics
Answer: A - The ALU handles calculations (addition, subtraction) and logic (AND, OR) operations.
82. Which of these is a characteristic of SRAM compared to DRAM?
- a) Faster access time
- b) Higher density
- c) Requires constant refreshing
- d) Cheaper to manufacture
Answer: A - SRAM (Static RAM) is faster but more expensive than DRAM, used in CPU caches.
83. What is the purpose of the control unit in a CPU?
- a) Directs operations of the processor
- b) Stores temporary data
- c) Converts analog to digital signals
- d) Manages power supply
Answer: A - The control unit fetches, decodes, and executes instructions.
84. Which interface is commonly used for connecting high-speed SSDs?
- a) NVMe
- b) SATA
- c) IDE
- d) USB 2.0
Answer: A - NVMe (Non-Volatile Memory Express) uses PCIe for faster SSDs (up to 3500 MB/s).
85. What does USB Type-C offer compared to USB Type-A?
- a) Reversible plug orientation
- b) Lower data transfer speeds
- c) Larger physical size
- d) Incompatibility with newer devices
Answer: A - USB-C is reversible and supports faster data/power delivery (up to 40 Gbps with USB4).
86. Which of these is a function of the operating system's kernel?
- a) Memory management
- b) Word processing
- c) Graphic design
- d) Web browsing
Answer: A - The kernel allocates RAM to processes and ensures isolation.
87. What is the purpose of a capacitor in a motherboard?
- a) Stabilizes power delivery
- b) Stores BIOS settings
- c) Processes graphics
- d) Connects to the internet
Answer: A - Capacitors filter and regulate voltage to components.
88. Which of these is a feature of UEFI compared to legacy BIOS?
- a) Supports larger hard drives (>2TB)
- b) Slower boot times
- c) No graphical interface
- d) Limited to 32-bit systems
Answer: A - UEFI (Unified Extensible Firmware Interface) offers faster boots, secure boot, and GPT partition support.
89. What is the role of a register in a CPU?
- a) Holds data for immediate processing
- b) Stores long-term files
- c) Connects to peripheral devices
- d) Manages internet connectivity
Answer: A - Registers are small, fast storage locations for active computations (e.g., accumulator).
90. Which protocol is used for secure remote login?
- a) SSH
- b) FTP
- c) HTTP
- d) SMTP
Answer: A - SSH (Secure Shell) encrypts remote command-line access.
91. What is the purpose of a heatsink in a computer?
- a) Dissipates heat from components
- b) Stores temporary data
- c) Boosts Wi-Fi signals
- d) Converts AC to DC power
Answer: A - Heatsinks (often with fans) prevent CPU/GPU overheating.
92. Which of these is a type of non-volatile memory?
- a) Flash memory
- b) DRAM
- c) SRAM
- d) Cache memory
Answer: A - Flash memory (used in SSDs, USB drives) retains data without power.
93. What does the term "overclocking" refer to?
- a) Running a component at a higher speed than specified
- b) Cooling a CPU below ambient temperature
- c) Reducing power consumption
- d) Encrypting hard drive data
Answer: A - Overclocking increases performance but may cause overheating.
94. Which component converts digital signals to analog for modem communication?
- a) DAC (Digital-to-Analog Converter)
- b) ADC (Analog-to-Digital Converter)
- c) ALU
- d) GPU
Answer: A - DACs are used in modems, audio interfaces, and displays.
95. What is the purpose of the Windows Registry?
- a) Stores system and application settings
- b) Manages internet bandwidth
- c) Defragments hard drives
- d) Acts as a firewall
Answer: A - The Registry is a hierarchical database for OS/software configurations.
96. Which of these is a disadvantage of cloud computing?
- a) Dependency on internet connectivity
- b) Higher upfront hardware costs
- c) Limited scalability
- d) Slower data access than local storage
Answer: A - Cloud services require stable internet; outages disrupt access.
97. What is the function of a transistor in a CPU?
- a) Acts as a switch/amplifier for electronic signals
- b) Stores permanent data
- c) Converts sound to digital signals
- d) Powers the motherboard
Answer: A - Transistors form logic gates (millions/billions in modern CPUs).
98. Which of these is a feature of IPv6 compared to IPv4?
- a) Larger address space
- b) Shorter addresses
- c) Less secure
- d) No support for multicast
Answer: A - IPv6 uses 128-bit addresses (3.4×10³⁸ addresses) vs. IPv4's 32-bit.
99. What is the purpose of a QR code?
- a) Stores data in a machine-readable format
- b) Encrypts sensitive information
- c) Boosts Wi-Fi signals
- d) Functions as a computer virus
Answer: A - QR codes encode data (e.g., URLs, text) for quick scanning.
100. Which of these is a characteristic of a 64-bit processor?
- a) Can address more than 4GB of RAM
- b) Runs only 32-bit software
- c) Has fewer registers than a 32-bit CPU
- d) Slower clock speeds than 32-bit CPUs
Answer: A - 64-bit CPUs support larger memory addressing (theoretically up to 16 exabytes).