WorksheetsY22 CS CPU and Data Rep
Total questions: 25
Worksheet time: 18mins
James is assembling a computer and wants to understand the role of each component. What is the main purpose of the CPU in his computer?
To permanently store data
To display output to the user
To provide power to components
To fetch, decode and execute instructions
Which of the following is a component found inside the CPU?
Hard disk drive
Power supply unit
Motherboard
Arithmetic Logic Unit (ALU)
What is the role of the Control Unit (CU)?
Performs mathematical calculations
Stores data permanently
Displays results to the user
Controls and coordinates the execution of instructions
How does increasing clock speed affect CPU performance?
It increases storage capacity
It reduces power consumption
It allows more RAM to be installed
It allows more instructions to be processed per second
How do multiple CPU cores improve performance?
They increase the size of cache memory
They reduce the need for RAM
They slow down processing to save energy
They allow multiple tasks to be processed at the same time
What is the purpose of cache memory?
To store files long-term
To replace RAM
To store user documents
To store frequently used data close to the CPU for faster access
Which register stores the address of the next instruction to be fetched?
Accumulator
Memory Data Register (MDR)
Current Instruction Register (CIR)
Program Counter (PC)
Why is cache memory faster than RAM?
It has a larger capacity
It is stored on the hard drive
It uses virtual memory
It is located closer to the CPU and uses faster memory technology
Which statement best describes primary storage?
It stores data permanently
It is slower than secondary storage
It is only used for backups
It stores data and programs currently in use
Which of the following is an example of primary storage?
Hard disk drive
Solid state drive
Optical disc
Random Access Memory (RAM)
Explain the purpose of RAM
What is the main use of ROM?
Running applications
Storing user files
Temporary storage
Storing firmware used during boot-up
Which of the following is a type of secondary storage?
Cache memory
Registers
RAM
Solid State Drive (SSD)
Which comparison between HDDs and SSDs is correct?
HDDs are faster and more durable
SSDs are cheaper and slower
HDDs have no moving parts
SSDs are faster and more durable than HDDs
What is a disadvantage of cloud storage?
What is the binary equivalent of denary 13?
1010
1110
1101
1101
What is the hexadecimal equivalent of the binary number 10101100₂?
A8
AC
B2
AC
How many unique values can be represented using 5 bits?
16
24
30
32
What does bit depth refer to in digital images?
The image resolution
The number of pixels
The file format
The number of bits used to represent the colour of each pixel
How many bytes are in 1 KB?
1,000
1,024
1,048
1,048,576
What is the key difference between lossy and lossless compression?
Lossless removes more data
Lossy files are larger
Lossless reduces quality
Lossy removes some data permanently, lossless does not
Which file type typically uses lossy compression?
PNG
WAV
FLAC
MP3
A file is reduced from 8 MB to 2 MB. What is the compression ratio?
2:8
2:4
8:2
4:1
Why is lossy compression often used for images and sound?
It improves quality
It keeps all original data
It increases file size
The reduction in quality is usually not noticeable to humans
Which factor increases the file size of a digital sound file?
Lower bit depth
Shorter duration
Mono sound
Higher sample rate
