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| Section | Objectives |
|---|---|
| Topic 1: Programming Foundations | - Programming Concepts
|
| Topic 2: Operating Systems & Architecture | - System Architecture
|
| Topic 3: Data & Security Basics | - Security Fundamentals
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| Topic 4: Computer Science Fundamentals | - Data Structures Introduction
|
>> Foundations-of-Computer-Science Latest Exam Notes <<
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NEW QUESTION # 59
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 # 60
What is the purpose of the pointer element of each node in a linked list?
Answer: A
Explanation:
In a singly linked list, each node is a small record that typically contains two main parts: a data field and a pointer field. The data field stores the actual value being kept in the list. The pointer field stores the address or reference of another node. The pointer element's purpose is to connect one node to the next by indicating where the next node is located in memory. This is essential because linked-list nodes are not stored in contiguous memory locations the way array elements are. Nodes may exist anywhere in memory, and the pointer is what preserves the logical sequence of the list.
This design supports efficient structural changes. For traversal, a program starts at the head node and repeatedly follows the pointer to reach subsequent nodes. For insertion, a new node can be added by adjusting a small number of pointers instead of shifting many elements, as would be required in an array. For deletion, the list can "skip over" a node by updating the pointer in the previous node to reference the node after the removed one. The end of the list is typically represented by a null pointer value, signaling there is no next node.
Keeping track of list size or current position is not the responsibility of each node's pointer field; these are usually handled by separate variables or computed during traversal.
NEW QUESTION # 61
print(20 # 5)
What will the output be of this line?
Answer: B
Explanation:
In Python, the # character begins acomment. Everything from # to the end of the line is ignored by the interpreter and is not executed. Therefore, the line # print(20 # 5) producesno outputbecause it is a comment, not an executable statement. This is a standard concept in programming language textbooks: comments are for humans, not for the machine, and they are used to document code, explain intent, temporarily disable statements during debugging, or leave notes about assumptions and design choices.
Even though the line contains an unusual symbol #, it does not matter here, because the interpreter never tries to parse the commented text. If the # were removed, then Python would attempt to parse print(20 # 5), and since # is not a valid Python operator, that would indeed trigger a syntax error. But with the leading #, the entire line is inert.
Option A is incorrect because nothing is evaluated. Option C is incorrect because comments are not printed; they remain only in the source code. Option D is incorrect for the commented version of the line, since Python does not check comment contents for syntax. Thus, the correct result is no output.
NEW QUESTION # 62
What is the first step in the selection sort algorithm?
Answer: C
Explanation:
Selection sort works by growing a sorted portion of the list one element at a time. The algorithm conceptually divides the array into two regions: asorted prefixon the left and anunsorted suffixon the right. At the beginning, the sorted prefix is empty and the entire list is unsorted. The first step is to consider position 0 as the target location for the smallest element. The algorithm scans the unsorted region (initially the whole list) to find the smallest valueand records its index. That action is exactly what option C describes: determine the lowest value starting from the first position.
After identifying the minimum element, selection sort swaps it into position 0 (if it isn't already there). Then it repeats the process for position 1, scanning the remaining unsorted suffix to find the next smallest element, swapping it into place, and so on. Textbooks emphasize that the key characteristic of selection sort is the repeated "select min (or max) from unsorted region and place it into the sorted region." Option A is not the standard first step; finding both min and max is unnecessary. Option B describes an unrelated swap that doesn't ensure progress toward sorting. Option D is not a "first step" but rather a different ordering goal; selection sort can be adapted for descending order, but the canonical version begins by selecting the minimum for the first position.
NEW QUESTION # 63
What is the built-in data structure that implements a hash table in Python?
Answer: D
Explanation:
A hash table is a data structure that supports fast lookup, insertion, and deletion by using ahash functionto map keys to positions in an underlying storage structure. In Python, the built-in data structure that provides hash-table behavior is thedictionary, written with curly braces like {"a": 1, "b": 2}. Dictionaries store key- value pairs and are designed so that accessing a value by key, such as d["a"], is efficient on average.
Textbooks typically describe this expected efficiency as average-case constant time, often written as O(1), assuming a good hash function and a well-managed table size.
Tuples and lists are sequence types. Lists provide indexed access by integer position, not hashing by arbitrary keys. Tuples are immutable sequences and likewise do not provide key-based hashing semantics. "Array" is not the core built-in mapping structure in Python; while Python has an array module and NumPy has arrays, neither is the built-in hash table abstraction for general key-value storage.
Python dictionaries require keys to be hashable, meaning the key's hash value is stable during its lifetime (common examples: strings, numbers, tuples of hashable items). This requirement is directly tied to hash-table implementation. Dictionaries are used throughout computer science applications:
symbol tables in interpreters, caches and memoization, frequency counting, indexing, and implementing graphs via adjacency maps.
NEW QUESTION # 64
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