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| Section | Objectives |
|---|---|
| IT Roles, Governance & Professional Practices | - IT Careers
|
| Computer Hardware & Software Fundamentals | - Software Systems
|
| Data, Databases & Information Systems | - Databases
|
| Cybersecurity & Emerging Technologies | - Emerging Tech & Ethics
|
| Networking & Internet Fundamentals | - Network Concepts
|
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NEW QUESTION # 76
Why are businesses beginning to use big data?
Answer: B
Explanation:
*Businesses are beginning to use big data to integrate vast amounts of electronic data into analysis in order to gain insight for better decision making.
*Explanation: Big data allows organizations to analyze large datasets to uncover patterns, trends, and correlations, leading to more informed decisions and strategic business moves1.
* Therefore, the correct answer is A. To integrate vast amounts of electronic data into analysis in order to gain insight for better decision making.
NEW QUESTION # 77
What is the role of the CPU in a computing environment?
Choose 2 answers
Answer: B,C
Explanation:
1.Arithmetic Logic Unit (ALU):
oThe ALU is a critical component within the CPU. It performs various arithmetic operations (such as addition, subtraction, multiplication, and division) and logic operations (such as comparisons, AND/OR operations, and shifting).
oWhen you perform a calculation on your computer, the ALU processes the numbers involved and produces the result.
oFor example, when you add two numbers in a spreadsheet, the ALU handles the addition operation.
2.Instruction Execution:
oThe CPU executes instructions based on machine code (binary signals represented as 1's and 0's).
oThese instructions come from software programs (applications), the operating system, or other components.
oThe CPU fetches an instruction from memory, decodes it, performs the necessary operation (using the ALU), and then stores the result.
oThis process happens at an incredibly fast rate, allowing your computer to perform complex tasks seamlessly.
3.System Bus:
oThe CPU communicates with other components (such as RAM, storage devices, and peripherals) through the system bus.
oThe system bus consists of three types:
Control Bus: Facilitates communication between the CPU and other devices.
Data Bus: Transfers data between different components.
Address Bus: Identifies memory locations for data access.
References
1.What Is a CPU, and What Does It Do? - How-To Geek
2.What Is The Purpose Of The Central Processing Unit (CPU) In A Computer? - Robots.net
3.Central Processing Unit (CPU) - GeeksforGeeks12
NEW QUESTION # 78
What is the role of the compiler?
Answer: C
Explanation:
1.Lexical Analysis:
oThe source code is first tested by the compiler's lexer, which breaks it down into tokens (such as keywords, identifiers, operators, and punctuation).
oThis step identifies the individual elements of the program.
2.Syntactic and Semantic Analysis:
oThe compiler performs syntactic analysis, checking the source code for syntax errors and ensuring it follows the correct language-specific rules.
oIf any errors occur, the compiler throws an error and stops the compilation.
oAdditionally, the compiler performs semantic analysis to find the meaning of the code.
oIt checks for logical errors, such as type mismatches, undeclared variables, and incorrect usage of operators.
3.Optimization:
oOnce the code is syntactically correct, the compiler performs low-level optimization to improve performance.
oThis may involve reducing memory usage or optimizing code for speed by rearranging instructions or eliminating unnecessary operations.
4.Output Code Generation:
oFinally, the compiler generates machine code corresponding to the original source code.
oThe resulting machine code resides in a binary file that the computer's hardware can execute directly.
Why Do We Use Compilers?
*Compilers catch syntax and semantic errors before running the code, saving time and preventing crashes.
*They optimize code for efficient execution, resulting in faster, more compact programs.
Disadvantages of a Compiler:
*Compiled code is platform-dependent, meaning it produces a machine-specific executable file.
*Code compiled on one type of machine won't run on another type without recompilation1.
References
1.GeeksforGeeks
2.Built In
3.Wikipedia
NEW QUESTION # 79
What type of database uses parent-child relationships?
Answer: B
Explanation:
Hierarchical databases use a parent-child relationship model. In this type of database, data is organized into a tree-like structure that implies a single-parent for each record. This model allows the representation of data in a hierarchy which is very much like a family tree. Each parent can have multiple children, but each child has only one parent (also known as a one-to-many relationship).
The hierarchical database model was one of the first database models, historically used with mainframe computers. In this model, records contain information about their groups of parent/child relationships, similar to a family tree. If we consider a database of employees,each department would be a parent node, and each employee within that department would be a child node of the department.
References: The concept of parent-child relationships in databases is well-established and discussed in various educational resources and forums. For example, Stack Overflow provides explanations of how these relationships work in practice12. Additionally, other resources like phoenixnap.com explain how these relationships are established in databases3.
NEW QUESTION # 80
An Instructor delivers a quiz to the students in a class, assigns a grade to each quiz, and determines the minimum, maximum, and average grade. When the quizzes are returned, the students receive the average differential for each grade.
Which content is considered data in this scenario?
Answer: D
Explanation:
In this scenario, the grade for each quiz is considered data. Each student's specific score represents a discrete piece of information, and collectively, these individual grades form the dataset that the instructor analyzes to calculate the minimum, maximum, and average grades1. The other options (average differential, minimum and maximum grade for all quizzes, and average grade for all quizzes) are derived metrics or summaries based on this raw data2.
NEW QUESTION # 81
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