Year 9 GCSE 1.1 Lesson 3 quiz: CPU and performance.

What is the role of the Arithmetic Logic Unit (ALU)?

• To perform calculations and make logical decisions
• To store permanent files like documents and videos on a long-term basis
• To manage and configure network connections for external devices
• To display graphical output on the computer's screen using dedicated hardware

What does the Control Unit do in the CPU?

• It sends signals to dictate how data moves around the CPU

• It enhances audio performance using specialised hardware for sound processing
• It handles software installation and monitors internet usage
• It manages external storage devices such as USB drives and external hard disks

What is the primary purpose of cache memory?

• To provide fast access to frequently used instructions and data
• To permanently store large programs and operating systems for future use
• To act as a backup in case the computer’s hard drive fails suddenly
• To help the computer download and install updates from the internet automatically

What are registers in the CPU?

• Tiny, fast memory locations with specific purposes
• Large capacity memory slots that can be upgraded to store more user data
• External chips that connect to USB ports to improve processing power
• Cloud-based memory units that synchronise automatically across multiple devices

What does clock speed measure?

• The number of instruction cycles the CPU can carry out per second
• How much time it takes for a program to load based on internet speed
• The duration it takes the cooling fan to regulate system temperature effectively
• The number of programs the user can install without slowing down the system

Why is cache memory faster than main memory?

• Because it is located closer to or inside the CPU
• Because it uses a complex layered file system similar to SSD drives
• Because it is refreshed automatically using advanced background processes
• Because it compresses data in real-time to improve overall read and write speeds

What is a CPU core?

• A complete processing unit within the CPU
• A high-performance fibre cable connecting different parts of the computer
• A graphical chip responsible for all visual output on the monitor
• A battery-powered unit that improves the efficiency of mobile devices

How does having more CPU cores affect performance?

• It allows multiple instructions to be processed simultaneously
• It guarantees that all software will run at twice the speed without exception
• It enables the computer to automatically update itself without user interaction
• It disables older cores to improve energy efficiency and prevent overheating

What is the name of the special register that keeps track of the next instruction to be executed?

• Program Counter
• File Access Register for Secondary Memory Devices
• Advanced Virtual Memory Address Locator System
• Synchronous Input Output Scheduler

Why doesn’t adding more cores always double performance?

• Because cores must communicate and not all software uses them fully
• Because computers can’t physically handle more than four simultaneous processes
• Because RAM limits prevent additional cores from accessing system data efficiently
• Because each core needs its own separate operating system and software drivers