String Manipulation Algorithms MCQs

By: Prof. Dr. Fazal Rehman Shamil | Last updated: September 20, 2024

What is the time complexity of searching for a substring in a string using the Knuth-Morris-Pratt algorithm?
A) O(n)
B) O(m + n)
C) O(n^2)
D) O(m)
Answer: B) O(m + n)

Which of the following algorithms is used for pattern matching in strings?
A) Quick Sort
B) Merge Sort
C) Rabin-Karp Algorithm
D) Dijkstra’s Algorithm
Answer: C) Rabin-Karp Algorithm

What is the primary use of the Levenshtein distance algorithm?
A) To find the shortest path in a graph
B) To measure the similarity between two strings
C) To sort strings alphabetically
D) To concatenate strings
Answer: B) To measure the similarity between two strings

Which algorithm is commonly used for finding the longest common subsequence?
A) Dynamic Programming
B) Greedy Algorithm
C) Divide and Conquer
D) Backtracking
Answer: A) Dynamic Programming

What does the Boyer-Moore algorithm primarily optimize?
A) Memory usage
B) Pattern matching efficiency
C) String sorting
D) Substring searching
Answer: B) Pattern matching efficiency

In which scenario is the Rabin-Karp algorithm most efficient?
A) When searching for a single character
B) When the pattern is long and there are many patterns
C) When searching for patterns in sorted strings
D) When using a small alphabet
Answer: B) When the pattern is long and there are many patterns

What is the primary advantage of using tries for string storage?
A) Fast substring searching
B) Efficient memory usage
C) Fast insertion and deletion operations
D) Easy to implement
Answer: A) Fast substring searching

Which of the following is NOT a string manipulation operation?
A) Concatenation
B) Insertion
C) Sorting
D) Compiling
Answer: D) Compiling

What does the term ‘string hashing’ refer to?
A) Converting a string into a numerical value
B) Breaking a string into characters
C) Sorting a string alphabetically
D) Finding the length of a string
Answer: A) Converting a string into a numerical value

Which algorithm is used to find the longest palindromic substring?
A) Manacher’s Algorithm
B) KMP Algorithm
C) Rabin-Karp Algorithm
D) Aho-Corasick Algorithm
Answer: A) Manacher’s Algorithm

What is the worst-case time complexity of the naive substring search algorithm?
A) O(n)
B) O(m + n)
C) O(n^2)
D) O(m^2)
Answer: C) O(n^2)

What does the ‘replace’ operation in string manipulation do?
A) Deletes a substring
B) Replaces occurrences of a substring with another substring
C) Splits a string into an array
D) Appends characters to a string
Answer: B) Replaces occurrences of a substring with another substring

Which method is used to convert a string to lowercase in many programming languages?
A) lower()
B) toLowerCase()
C) convertToLower()
D) makeLower()
Answer: B) toLowerCase()

What is a common application of the Z algorithm?
A) Sorting strings
B) Pattern matching
C) String comparison
D) String reversal
Answer: B) Pattern matching

What does the ‘split’ operation do in string manipulation?
A) Merges two strings
B) Divides a string into substrings based on a delimiter
C) Removes characters from a string
D) Appends characters to a string
Answer: B) Divides a string into substrings based on a delimiter

Which string manipulation algorithm uses a sliding window technique?
A) Rabin-Karp
B) KMP
C) Longest Common Substring
D) Longest Palindromic Substring
Answer: D) Longest Palindromic Substring

What is the purpose of the ‘trim’ operation in string manipulation?
A) To sort a string
B) To remove leading and trailing whitespace
C) To find the length of a string
D) To convert a string to uppercase
Answer: B) To remove leading and trailing whitespace

Which of the following is a property of immutable strings?
A) Strings can be modified after creation
B) Memory is reused
C) Strings cannot be changed once created
D) Strings are stored in a heap
Answer: C) Strings cannot be changed once created

What does the ‘substring’ operation do?
A) Returns the entire string
B) Creates a new string from a portion of the original string
C) Deletes a portion of the string
D) Sorts the characters in the string
Answer: B) Creates a new string from a portion of the original string

Which algorithm is used to compare two strings for equality?
A) Boyer-Moore
B) Knuth-Morris-Pratt
C) Simple comparison
D) Z Algorithm
Answer: C) Simple comparison

What is a common application of string manipulation algorithms in natural language processing?
A) Text classification
B) Image processing
C) Video analysis
D) Data compression
Answer: A) Text classification

Which data structure is commonly used to implement a trie?
A) Array
B) Linked List
C) Tree
D) Hash Table
Answer: C) Tree

What is the purpose of a suffix tree?
A) To store only unique substrings
B) To provide fast substring searching
C) To compress strings
D) To sort strings
Answer: B) To provide fast substring searching

What is the time complexity of the Boyer-Moore algorithm in the average case?
A) O(m + n)
B) O(n)
C) O(n^2)
D) O(m)
Answer: A) O(m + n)

Which of the following is a greedy algorithm for string manipulation?
A) Huffman Coding
B) Dynamic Programming
C) Binary Search
D) Merge Sort
Answer: A) Huffman Coding

What is the purpose of using character encoding in strings?
A) To compress strings
B) To convert strings into numerical values
C) To represent characters in bytes
D) To sort strings
Answer: C) To represent characters in bytes

Which operation can be performed to check if a string is a palindrome?
A) Reverse the string and compare
B) Count the characters
C) Sort the string
D) Remove whitespace
Answer: A) Reverse the string and compare

What is the main advantage of using string interning?
A) Reduces memory usage
B) Increases performance
C) Simplifies string operations
D) Allows for easy comparison
Answer: A) Reduces memory usage

Which of the following methods would you use to join an array of strings?
A) concatenate()
B) join()
C) merge()
D) append()
Answer: B) join()

What is the main difference between shallow and deep copying of strings?
A) Shallow copies the data, deep copies references
B) Shallow copies references, deep copies the data
C) There is no difference
D) Shallow copying is faster
Answer: B) Shallow copies references, deep copies the data

In which application are string manipulation algorithms often used?
A) Image processing
B) Web scraping
C) Sorting numbers
D) Graph algorithms
Answer: B) Web scraping

What is the time complexity of the naive algorithm for finding all occurrences of a substring?
A) O(n)
B) O(m + n)
C) O(n^2)
D) O(m^2)
Answer: C) O(n^2)

What is the output of the ‘reverse’ operation on the string “hello”?
A) “olleh”
B) “hello”
C) “he”
D) “world”
Answer: A) “olleh”

Which algorithm is used for compressing strings?
A) Run-Length Encoding
B) Merge Sort
C) Dijkstra’s Algorithm
D) Bubble Sort
Answer: A) Run-Length Encoding

What does a regular expression do in string manipulation?
A) Sorts strings
B) Searches and manipulates text based on patterns
C) Converts strings to numbers
D) Formats strings
Answer: B) Searches and manipulates text based on patterns

What is the main purpose of the Knuth-Morris-Pratt algorithm?
A) To sort strings
B) To find the longest common substring
C) To efficiently search for substrings
D) To remove duplicates from strings
Answer: C) To efficiently search for substrings

 

Data Structures MCQs

Basic Concepts

  1. Introduction to Data Structures
  2. Complexity Analysis MCQs

Linear Data Structures MCQs

  1. Arrays MCQs
  2. Linked Lists MCQs
  3. Stacks MCQs
  4. Queues MCQs

Non-Linear Data Structures MCQs

  1. Trees MCQs
  2. Heaps MCQs
  3. Graphs MCQs

Hashing MCQs MCQs

  1. Hash Tables

Sorting and Searching Algorithms MCQs 

  1. Sorting Algorithms MCQs
  2. Searching Algorithms MCQs

Miscellaneous

  1. Memory Management in data structures MCQs
  2. String Manipulation Algorithms MCQs
  1. Data Structures MCQs 1
  2. Data Structures MCQs 2
  3. Data Structures MCQs 3
  4. Data Structures MCQs 4
  5. Data Structures MCQs 5
  6. Stacks Solved MCQs
  7. Queues MCQs
  8. pointer mcqs
  9. Array MCQs