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Questions and Answers
Which of the following devices is classified as an output device?
Which of the following devices is classified as an output device?
- Mouse
- Printer (correct)
- Keyboard
- Scanner
What is a byte defined as?
What is a byte defined as?
- A group of 2 bits
- A group of 4 bits
- A group of 16 bits
- A group of 8 bits (correct)
Which term describes a program or set of programs designed to interact with a computer?
Which term describes a program or set of programs designed to interact with a computer?
- Software (correct)
- Malware
- Firmware
- Hardware
What is the significance of open source software?
What is the significance of open source software?
What does a nibble consist of?
What does a nibble consist of?
Which of the following measurements is NOT typically used to quantify computer memory?
Which of the following measurements is NOT typically used to quantify computer memory?
Which component is NOT considered an output device?
Which component is NOT considered an output device?
Which of the following best defines a bit?
Which of the following best defines a bit?
What is stored in the /bin directory of the Linux file system?
What is stored in the /bin directory of the Linux file system?
Which directory would you find system configuration files in a Linux system?
Which directory would you find system configuration files in a Linux system?
Why is learning GNU/Linux considered beneficial for a career?
Why is learning GNU/Linux considered beneficial for a career?
What information can be found in the /proc directory?
What information can be found in the /proc directory?
Where are temporary files stored in a Linux file system?
Where are temporary files stored in a Linux file system?
Which of the following describes the /home directory?
Which of the following describes the /home directory?
What is the role of repositories in a GNU/Linux distribution?
What is the role of repositories in a GNU/Linux distribution?
Which of the following is true about the flexibility of GNU/Linux?
Which of the following is true about the flexibility of GNU/Linux?
What is the primary data model widely used for data storage and processing?
What is the primary data model widely used for data storage and processing?
What does the DECIMAL data type represent in a database?
What does the DECIMAL data type represent in a database?
Which of the following is NOT one of the standard properties of transactions in a database?
Which of the following is NOT one of the standard properties of transactions in a database?
What does the term 'atomicity' in transactions ensure?
What does the term 'atomicity' in transactions ensure?
For storing a date in a database, which data type would be appropriate?
For storing a date in a database, which data type would be appropriate?
What is a transaction in the context of databases?
What is a transaction in the context of databases?
Which of the following describes the INT data type in a database?
Which of the following describes the INT data type in a database?
What is the significance of handling database errors during transactions?
What is the significance of handling database errors during transactions?
What is the primary concern of data integrity in a DBMS?
What is the primary concern of data integrity in a DBMS?
Which of the following best describes data security in a database?
Which of the following best describes data security in a database?
What is a data model in the context of databases?
What is a data model in the context of databases?
Which data type can hold a fixed length string that includes letters, numbers, and special characters?
Which data type can hold a fixed length string that includes letters, numbers, and special characters?
What feature does a DBMS provide to reduce application development and maintenance time?
What feature does a DBMS provide to reduce application development and maintenance time?
Which of the following models is NOT mentioned as a type of data model?
Which of the following models is NOT mentioned as a type of data model?
What is the consequence of unauthorized access to a database?
What is the consequence of unauthorized access to a database?
What does the specific data type of a field in a database determine?
What does the specific data type of a field in a database determine?
What does the term 'Durability' in database operations refer to?
What does the term 'Durability' in database operations refer to?
In the context of a database table, what is a 'Field'?
In the context of a database table, what is a 'Field'?
What is the role of 'Isolation' in RDBMS?
What is the role of 'Isolation' in RDBMS?
Which of the following correctly defines a 'Record' in a database?
Which of the following correctly defines a 'Record' in a database?
What does a 'Key' signify in a database table?
What does a 'Key' signify in a database table?
How are columns represented in a table?
How are columns represented in a table?
What defines the 'Consistency' in database transactions?
What defines the 'Consistency' in database transactions?
How does an RDBMS organize data?
How does an RDBMS organize data?
Flashcards
Output Devices
Output Devices
Devices that show or reproduce computer data in a user-friendly way.
Monitors
Monitors
Output devices that display images and text.
Printers
Printers
Output devices that produce printed documents.
Speakers
Speakers
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Memory Size Units
Memory Size Units
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Megabytes (MB)
Megabytes (MB)
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Gigabytes (GB)
Gigabytes (GB)
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Bit
Bit
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Nibble
Nibble
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Byte
Byte
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Software
Software
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Open-source software
Open-source software
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Linux distributions
Linux distributions
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Root Directory
Root Directory
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/bin
/bin
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/dev
/dev
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/etc
/etc
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/proc
/proc
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/home
/home
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Data Security (DBMS)
Data Security (DBMS)
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Authorization
Authorization
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Integrity Constraints
Integrity Constraints
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CHAR data type
CHAR data type
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VARCHAR data type
VARCHAR data type
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DECIMAL data type
DECIMAL data type
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Database Models
Database Models
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Relational Model
Relational Model
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Transaction Properties (ACID)
Transaction Properties (ACID)
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Study Notes
Output Devices
- Output devices display or reproduce data processed by the computer in a user-friendly form.
- Common output devices include monitors, screens, printers, and speakers.
- Includes all components with circuit boards within personal computers, such as motherboards, graphics cards, CPUs, and webcams.
Memory Units
- Memory size is typically measured in Megabytes (MB) and Gigabytes (GB).
- Bits, nibbles, bytes, and larger units are fundamental to understanding data storage:
- Bit: Smallest unit, representing values 0 or 1.
- Nibble: Comprises 4 bits.
- Byte: Group of 8 bits, capable of holding a data item or character.
Software
- Software consists of programs providing instructions that enable users to interact with computers.
- Open-source software: Publicly accessible, allowing users to modify and share code.
- Linux distributions often utilize free software, updating through repositories.
Linux File System Hierarchy
- Root directory: All system directories reside under "/", with specific directories serving distinct functions:
- /bin: Contains essential system programs.
- /dev: Stores connected device information.
- /etc: Houses system configuration files.
- /proc: Provides process-related information.
- /home: User-specific directories.
Benefits of Learning GNU/Linux
- Widely used in workplaces, powering millions of desktops and servers.
- Android, a smartphone OS, is based on a modified GNU/Linux kernel.
- Consistency and accuracy in database management are crucial for data integrity.
Data Security in DBMS
- Authorisation is key; only verified users should access databases.
- Unauthorized access violates integrity constraints, necessitating strong security measures.
Data Types in DBMS
- Different data types define field characteristics:
- CHAR: Fixed-length string for letters, numbers, special characters.
- VARCHAR: Variable-length string for similar data.
- DECIMAL: Represents numbers with or without decimal points.
- DATE and TIME: Store date and time data, respectively.
Database Models
- Database structure follows specific models, often relational, which is the most common:
- Organizes data into tables linked by defined relationships.
- Supports effective data processing and storage efficiency.
Transaction Properties (ACID)
- Transactions should maintain four key properties:
- Atomicity: All operations must complete successfully or else roll back.
- Consistency: Valid data states before and after transactions.
- Isolation: Transactions operate independently, minimizing interference.
- Durability: Ensures data remains intact even during system failures.
Key Database Terms
- Table: Basic unit of data storage, organized into rows and columns.
- Field: Specific information stored in a column.
- Record: A row in a table, containing related data, also referred to as a tuple.
- Key: Identifies unique records within a table.
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Description
This quiz focuses on the various output devices used in computers, including monitors, printers, and speakers. It explores how these devices reproduce data for the user's benefit. Test your knowledge on the components that form part of a computer system.
