WorksheetsOCR J277 Computer Science Paper 1 Revision Test 1
Total questions: 86
Worksheet time: 43mins
What is the primary function of the Arithmetic Logic Unit (ALU) in a CPU?
Controls the flow of data in and out of the CPU
Temporarily holds small amounts of data
Performs calculations and logical operations
Stores regularly used data for quick access
Amelia is configuring her new workstation for advanced video editing tasks. Which component of her computer system is crucial for processing all data and instructions?
Control Unit
Arithmetic Logic Unit
Central Processing Unit
Cache
What is the role of the Control Unit (CU) within the CPU?
Performs calculations including addition and subtraction
Temporarily holds small amounts of data
Controls the flow of data and manages instruction execution
Stores regularly used data for quick access
Isabelle is building a custom PC for gaming. Which factor does NOT affect the CPU performance of her gaming setup?
Number of cores
Clock speed
Cache size
Type of peripherals connected
What is the role of the Memory Address Register (MAR) in a CPU?
It stores the data being transferred to and from the memory unit
It holds the address of the next instruction to be executed
It contains the address of the memory location currently being accessed
It decodes the instructions fetched from memory
Which component of the CPU holds the actual data or instruction that has been fetched from memory or is waiting to be written to memory?
Arithmetic Logic Unit (ALU)
Memory Address Register (MAR)
Memory Data Register (MDR)
Control Unit
What is the primary function of the Program Counter (PC) in the Fetch-Execute Cycle?
It stores the data needed for CPU operations.
It keeps track of the next instruction to execute.
It manages the input/output operations of the system.
It performs arithmetic and logical operations on data.
In the Fetch-Execute Cycle, what happens during the "Decode" step?
The instruction in the MDR is decoded by the control unit.
The program counter is incremented to point to the next instruction.
Data is written to memory.
The memory address is copied from the program counter to the MAR.
Which type of memory loses its data when the power is turned off?
Hard Drive
RAM
SSD
ROM
Muhammad is working on his computer to complete a project. He needs to access data quickly while he works. Which type of memory is known as the main temporary memory in a computer that allows Muhammad to access this data quickly?
ROM
RAM
Virtual Memory
Secondary Storage
Arjun is working on a complex video editing project on his computer, which has limited RAM. What is the function of virtual memory in Arjun's computer system?
To increase the processing speed of the CPU
To store permanent data
To act as additional RAM by using secondary storage
To only read data and not write to it
ROM is described as which type of memory?
Volatile and writable
Non-volatile and writable
Non-volatile and only readable
Volatile and only readable
Which component contains the BIOS necessary for a computer to boot up?
RAM
CPU
ROM
Virtual Memory
While deciding on a new laptop, Priya is considering the type of storage device. What would be an important characteristic of Solid State Drives (SSDs) compared to Hard Disk Drives (HDDs) that Priya should consider?
SSDs have moving parts.
SSDs use magnetic storage.
SSDs are usually noisy.
SSDs have no moving parts.
Ava, Sophie, and Oliver are part of a tech team at a university. They need to choose a storage solution to archive decades of academic research data. Which type of storage is commonly used by organizations to store large amounts of data?
Flash drives
SSDs
Magnetic tape
Memory cards
What is a common use of external SSDs in a home computing environment?
They are mainly used for gaming.
They serve as primary operating system drives.
They are used for additional storage and backups.
They enhance the graphics performance of computers.
Max is setting up a new gaming PC and wants the fastest data access speeds for his games. Which type of storage device should he choose?
External HDD
Internal SSD
USB Flash Drive
Optical Disc
What is the primary function of peripheral management in an operating system?
To allocate memory addresses to applications
To communicate with internal hardware and manage peripherals using drivers
To organize files into a hierarchical structure
To grant user access to specific data and resources
Anna, Carlos, and Lee are developing a software application. They want to ensure the interface allows users to interact through graphical icons and visual indicators rather than text-based command lines. What type of interface are they focusing on?
Text-Based User Interfaces
Graphical User Interfaces (GUIs)
Hardware Control Interfaces
Network Configuration Interfaces
How does memory management enhance system efficiency?
By organizing files into folders
By controlling user access
By dividing CPU processing time between tasks to complete them efficiently
By choosing correct drivers for hardware
How does the operating system ensure the security of file data?
By encrypting file contents
By managing user permissions for files
By physically locking the hard drive
By monitoring Internet traffic
As an IT technician for a law firm, Oscar is assigned to manage sensitive data on shared computers. Which feature of user management in operating systems is aimed at preventing unauthorized access by other employees?
Allocating memory addresses to apps
Using memory buffers to store data
Organizing files into folders
Using anti-theft measures like passwords or pin protection
Alexander is working on his computer and notices that it has become significantly slower when accessing files. He learns that this might be due to fragmented data. What is the primary purpose of defragmentation software that Alexander might use to solve this issue?
To encrypt data to prevent unauthorized access
To compress files and reduce their size
To reorganize a HDD by putting related data back together
To permanently delete files from the system
Why do SSDs not require defragmentation like HDDs?
SSDs are random access and do not have a sequential read/write head
SSDs automatically compress files
SSDs use encryption software by default
SSDs are slower than HDDs
What happens to the hard disk when files are moved, deleted, or change size according to the defragmentation process?
The disk becomes encrypted
Small gaps appear on the disk
Files are compressed
The disk is cleaned of all data
How does defragmentation software improve the performance of a hard disk drive?
By encrypting the files
By compressing the files
By reducing the movement of the read/write head
By permanently removing data from files
What is the base number of the hexadecimal system?
10
2
16
8
What is the binary representation of the number 5?
0101
1010
0011
1001
How is the number 9 represented in hexadecimal?
(a)
What is the decimal equivalent of the binary number 1010?
10
12
8
5
Kiara is working on a project that involves low-level programming. She notices that hexadecimal numbers are frequently used. What is a primary advantage of using hexadecimal numbers in this context?
They simplify the representation of binary numbers
They are universally used in all programming languages
They increase computational speed directly
They require less memory to store
What is the value of the hexadecimal number 'A1' in decimal?
161
162
163
164
Sophia is learning about number systems in her computer science class. She is asked to convert the number 43 from denary to hexadecimal. What is the remainder when 43 is divided by 16?
11
10
12
13
What is the hexadecimal equivalent of the binary number 1110?
E
7
D
F
What is the binary representation of the hexadecimal digit E4?
1110 0100
1101 0100
1111 0100
1010 0100
What is the result of adding the binary numbers 1 and 1?
0
1
10
11
What happens when a binary number is left-shifted by one place?
The number is halved
The number remains the same
The number is doubled
The number is tripled
What is a potential issue when performing binary addition with two 8-bit numbers?
The result fits perfectly every time
The result might require more than 8 bits
The result is always less than 8 bits
The result is converted to a decimal number
What does a right shift operation do to a binary number?
Multiplies the number by two
Leaves the number unchanged
Divides the number by two
Squares the number
Which type of shift operation can cause the most significant bits to be lost?
Right shift
Left shift
Circular shift
No shift causes loss of bits
Charlie is organizing his computer files and notices different file sizes. Which of the following represents the largest unit of data size?
Byte
Kilobyte
Megabyte
Gigabyte
While preparing a presentation, Noah decides to reduce the file size of embedded videos to save space. He doesn't need to restore them to their original quality later. Which type of data compression should he use?
Lossy Compression
Lossless Compression
Efficient Compression
Temporary Compression
How many bytes are there in a Kilobyte?
100 bytes
1000 bytes
1024 bytes
2048 bytes
Florence is working on a project that involves storing large amounts of video data. What is a benefit of using data compression for Florence's project?
Increases file size
Uses more bandwidth
Files use less storage space
Reduces data accessibility
Which of the following is a benefit of lossless compression?
Reduces file size without losing quality
Reduces file size by removing some data
Increases the file size
Cannot be used on multimedia files
How many bits are typically used to represent a single ASCII character?
5 bits
6 bits
7 bits
8 bits
Which of the following statements is true about Unicode compared to ASCII?
Unicode uses the same number of bytes for each character as ASCII.
The first 128 characters in Unicode are different from those in ASCII.
Unicode can represent characters from major languages including Greek and Chinese.
Unicode represents characters using only a 7-bit binary code.
How many bits are needed to store the string "I'm a string, store me!" in 8-bit ASCII?
184 bits
192 bits
160 bits
200 bits
What is a bitmap in the context of image representation?
A type of image enhancement technique
A type of image compression format
A type of image made up of tiny dots, where each pixel is stored using a binary code
A type of image file format used exclusively for digital cameras
How is image resolution typically expressed?
In megabytes
As width x height in pixels
In dots per inch
As color depth in bits
What does color depth in an image determine?
The physical size of the image
The number of pixels in the image
The number of colors each pixel can represent
The file format of the image
How many colours can be represented with a colour depth of 2 bits?
2 colours
4 colours
8 colours
16 colours
What is the file size in bits for an image with a resolution of 100 x 100 pixels and a color depth of 16 bits?
160,000 bits
1,600 bits
16,000 bits
160 bits
What does metadata in an image file typically include?
The algorithm used for compression
The file size and file type
Information such as height, width, color depth, and resolution
The copyright information of the image
What is the role of 'bit depth' in digital audio processing?
It determines the overall loudness of the audio file
It refers to the number of bits used per sample in audio recordings
It controls the duration of the audio playback
It specifies the encryption level of the audio file
What is meant by "sample rate"?
The quality of the sound in a digital file
The duration of the sound recording
The number of samples taken per second
The size of the sound file
How does increasing the bit depth affect the quality of a digital audio file?
It increases the file's playback speed
It reduces the overall file size
It enhances the audio resolution and dynamic range
It decreases the noise level during recording
Isabelle is working on a digital sound recording project for her music class. She wants to calculate the file size of her recording. How should she calculate it?
Sample rate x bit depth
Sample rate + bit depth + length
Sample rate x bit depth x length
Sample rate / bit depth / length
Which factor will increase the quality as well as the file size of a digital sound file?
Lowering the sample rate
Decreasing the bit depth
Increasing the sample rate or bit depth
Shortening the length of the recording
During a school project, Matilda, Charlie, and Grace are setting up a network to connect all the computers in their classroom. What type of network are they setting up if it is specifically for a small geographical area?
Large Area Network
Local Area Network
Limited Access Network
Link Aggregate Network
Which of the following is NOT a typical use of a LAN?
Sharing an Internet connection
Accessing and sharing files
Connecting global corporate offices
Sharing hardware
What is the primary difference between LANs and WANs?
WANs are cheaper to set up
LANs cover larger geographical areas
WANs connect LANs in different geographical locations
LANs require an Internet connection to function
Emily is setting up a wireless network in her home office. Which factor does NOT affect the performance of her wireless network?
Type of cables used
Signal quality
Range of the device
Interference from other networks
What is the function of a Network Interface Controller (NIC) in computer networking?
It transmits data between networks as packets.
It allows devices to connect to a network, usually built into the motherboard.
It shields networks from external interference.
It connects multiple devices to a LAN wirelessly.
What type of network cable uses light to transmit data and is immune to electromagnetic interference?
Twisted pair
Coaxial
Fibre optic
None of the above
Scarlett is setting up a network for her new office building and is considering different types of cables. What is the primary advantage of using fibre optic cables in this scenario?
Low cost
High performance and can send data over long distances with little interference
Easy installation
Low bandwidth
Which wireless technology is primarily used for contactless payment systems and has a very short range?
Wi-Fi
NFC
Bluetooth
LTE
In a corporate setting where Mira, Oscar, and Leo work, what is a key advantage of using a client-server network model?
No central server required
Expensive to set up
Easy file tracking as all stored centrally
Data can be lost if one device fails
Which of the following is a disadvantage of peer-to-peer networks?
High performance
Easy to maintain without expertise
Data could be lost if one device fails
Network unaffected if a device fails
In a company's network setup using a star topology, what is a major drawback?
No single point of failure
Switch is a single point of failure
Easy to add more devices
Network unaffected if a device fails
Which characteristic is true for mesh topology?
Central switch controls the network
Single point of failure
No switch — data sent along fastest route from one device to another
Expensive for wired networks
What is the primary function of the Transmission Control Protocol (TCP) in network communication?
Encrypts website information
Directs packets to their destination across a network
Splits and reassembles data packets
Sends and transfers emails between servers
Sebastian is creating a website for his final year project. Which protocol will be used when the website is accessed via web browsers?
SMTP
HTTP
FTP
IMAP
What type of identifiers are IP addresses?
16-bit identifiers
32- or 128-bit identifiers
48- or 64-bit identifiers
8- or 16-bit identifiers
Which protocol is responsible for retrieving emails from a server and allows the server to delete the email after it is downloaded?
SMTP
POP
IMAP
FTP
What is the purpose of the HTTPS protocol?
Splits and reassembles data packets
Encrypts website information sent and received for security
Directs packets to their destination across a network
Retrieves emails from a server
Which protocol is primarily used for sending email attachments?
HTTP
FTP
SMTP
TCP
In computer networking, what does the term 'IP address' stand for?
Internet Provision address
Internet Protocol address
Internal Port address
Interface Privacy address
What is the hexadecimal representation of the binary number 1101 1010?
1A5
B4
DA
7E
What is the primary role of the Graphics Processing Unit (GPU) in a computer system?
To manage the computer's memory and processes
To enhance video and image processing capabilities
To store data permanently
To handle network connections
In computer terminology, what does the acronym 'BIOS' stand for?
Basic Input/Output System
Binary Integrated Operating System
Basic Integrated Output System
Binary Input/Output System
What is the primary function of cache memory in a computer system?
To store user data permanently.
To enhance the speed of the CPU.
To act as the main storage for the operating system.
To provide backup storage in case of system failure.
What does the term 'bit' stand for in computing?
Binary Digit
Binary Data
Bitrate Transfer
Binary Transmission
Charlie is considering upgrading his computer's storage. What is the main advantage of Charlie choosing an SSD over an HDD in terms of access speed?
SSDs have slower read and write speeds.
SSDs have faster read and write speeds.
SSDs require more power to operate.
SSDs have a larger storage capacity.
Which of the following is a characteristic of volatile memory?
It retains data when the power is turned off.
It is primarily used for long-term storage.
It loses stored data when the power is turned off.
It is slower than non-volatile memory.
In a client-server model, what role does the server primarily play?
Requests data from clients
Provides data and services to clients
Acts as an equal in data sharing
Only receives data, does not provide data
