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| Section | Objectives |
|---|---|
| Computer Science Fundamentals | - Core CS Concepts
|
| Data & Security Basics | - Data Handling
|
| Programming Foundations | - Language Concepts Overview
|
| Operating Systems & Architecture | - OS Fundamentals
|
>> Foundations-of-Computer-Science Original Questions <<
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NEW QUESTION # 61
Which protocol provides encryption while email messages are in transit?
Answer: A
Explanation:
"Encryption in transit" means protecting data while it moves across a network so that eavesdroppers cannot read or modify it. For email systems, this protection is most commonly provided byTLS (Transport Layer Security). TLS is a cryptographic protocol that can wrap application protocols (including mail protocols) to provide confidentiality, integrity, and server (and sometimes client) authentication. In practice, TLS is used to secure connections such as SMTP submission (often with STARTTLS or implicit TLS), IMAP over TLS, and POP3 over TLS. Textbooks present TLS as the standard successor to SSL and the foundation of secure communication on the modern Internet.
The other options are not correct in this context. FTP is a file transfer protocol and is traditionally unencrypted unless paired with additional security mechanisms (e.g., FTPS, which uses TLS, or SFTP, which uses SSH). HTTP is a web protocol; it becomes encrypted only when used as HTTPS, which again relies on TLS underneath. IMAP is an email retrieval protocol, butIMAP itself is not the encryption protocol- IMAP can be run over TLS (IMAPS) to become secure.
Therefore, the protocol that provides encryption while email messages (or email protocol traffic) are in transit is TLS.
NEW QUESTION # 62
Which type of files are meant to be inaccessible to standard users, but can be critical in terms of functionality?
Answer: D
Explanation:
Operating systems contain many files that are essential for booting, hardware support, security enforcement, and core services. These are generally referred to assystem files. Textbooks explain that system files are often protected by permissions and special attributes because accidental modification or deletion could destabilize the OS, break device drivers, prevent applications from running, or even stop the machine from booting.
Therefore, standard (non-administrator) users are typically restricted from accessing or altering them, and the OS may hide them by default to reduce the risk of user error.
Examples include kernel-related components, shared libraries, driver files, configuration databases, and critical service executables. Modern OS designs enforce protection through user accounts, access control lists, and privilege separation. This ensures only trusted processes and administrators can change system-critical components.
Log files record events and are sometimes protected, but many logs are readable by users or administrators depending on policy; they are not necessarily "meant to be inaccessible" in the same strict sense. Backup files are important for recovery but are not inherently system-critical for day-to-day operation, and their accessibility depends on organizational policy. "Extension files" is not a standard category; file extensions describe formats rather than a protected functional class.
Thus, the files intended to be inaccessible to standard users yet critical for functionality are system files, reflecting core OS security principles such as least privilege and integrity protection.
NEW QUESTION # 63
How does the data type of a variable get set in Python?
Answer: D
Explanation:
Python usesdynamic typing, a core concept emphasized in programming language textbooks. In dynamically typed languages, a variable name does not permanently "own" a type. Instead, theobjectcreated by an expression has a type, and the variable becomes a reference to that object. Therefore, the type associated with a variable at any moment is determined by the value assigned to it. For example, after x = 7, x refers to an integer object. After x = "seven", the same name now refers to a string object. The type changes because the binding changes, not because the variable's type declaration was edited.
Option A describesstatic typingsystems (common in languages like Java, C, or C++), where programmers declare types and compilers enforce them. Python does not require such declarations for ordinary variables.
Option B is incorrect because type assignment is deterministic, not random. Option C is incorrect because Python does not default variables to strings; it assigns whatever type results from the right-hand-side expression.
This model is closely tied to Python's runtime behavior: type checks occur during execution, and functions can accept values of different types as long as the operations used are valid (often discussed as
"duck typing"). This flexibility supports rapid development, but also motivates careful testing and, in larger systems, optional type hints for documentation and tool support.
NEW QUESTION # 64
How is the NumPy package imported into a Python session?
Answer: D
Explanation:
In Python, external libraries are brought into a program using the import statement. NumPy, which provides the ndarray type and a large collection of numerical computing functions, is conventionally imported with an alias for convenience. The standard and widely taught pattern is import numpy as np. This imports the numpy module and binds it to the shorter name np, making code more readable and reducing repeated typing, especially in mathematical expressions such as np.array(...), np.mean(...), or np.dot(...).
Option A is incorrect because the module name is numpy, not num_py. Options C and D resemble syntax from other languages (for example, "using" in C# or "include" in C/C++), but they are not valid Python import mechanisms. Python's module system is based on imports, and the aliasing feature (as np) is built into the import statement.
Textbooks also emphasize that importing a package requires that it be installed in the active Python environment. If NumPy is not installed, import numpy as np will raise an ImportError (or ModuleNotFoundError in modern Python). Once imported, the alias np is used consistently in scientific computing materials, notebooks, and professional data analysis codebases, which is why this option is considered the correct and expected answer.
NEW QUESTION # 65
Which Python function is used to display the data type of a given variable?
Answer: D
Explanation:
Python is a dynamically typed language, meaning variables do not require explicit type declarations; instead, objects carry type information at runtime. To inspect the type of an object, Python provides the built-in function type(). When you pass a variable or value into type(), it returns the object's class, which represents its data type. For example, type(5) returns <class 'int'>, type(3.14) returns <class 'float'>, and type("hello") returns <class 'str'>. This is commonly used in debugging, learning exercises, and when writing functions that must behave differently depending on input types.
Textbook discussions often pair type() with Python's object model: everything in Python is an object, and each object is an instance of some class. type() reveals that class. In addition, type() can be used in more advanced ways, such as dynamic class creation, but its foundational educational use is type inspection.
The other options are not correct because GetVar(), Show(), and Data() are not standard Python built- ins for type checking. While developers can define functions with those names, they are not part of Python's core language or standard library in the sense required by the question. For typical coursework and professional Python usage, the correct and universally accepted function is type().
NEW QUESTION # 66
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