Topics

Hash Tables

⛪ Computer Science and Engineering > Data Structure

Looking for practice questions on Hash Tables Data Structure? Our MCQ (Multiple Choice Questions) quiz is designed to help you test your knowledge and prepare for exams. Our practice questions cover a range of topics related to Hash Tables Data Structure, including implementation, operations, and more. Whether you're a student studying for an exam or a professional looking to brush up on your skills, our practice questions are a great way to test your knowledge and improve your understanding of Hash Tables Data Structure. Try our free practice questions today and get started on your path to success! ➲ Hash Tables - Quiz

Q 1: What is a hash table?

A A data structure that stores data in a random order
B A data structure that stores data in a sorted order
C A data structure that maps keys to values using a hash function
D A data structure that links nodes together to form a list

Q 2: What is the time complexity of accessing an element in a hash table? A. O(1)

A O(1)
B O(n)
C O(log n)
D O(n log n)

Q 3: What is the role of a hash function in a hash table?

A To determine the order in which elements are stored in the table
B To map keys to unique indices in the table
C To sort the elements in the table
D To count the number of elements in the table

Q 4: Which of the following is a collision resolution technique used in hash tables?

A Linear probing
B Binary search
C Depth-first search
D Breadth-first search

Q 5: Which of the following is a disadvantage of using open addressing for collision resolution?

A It can lead to clustering of elements in the table.
B It requires more memory than separate chaining.
C It requires more time to access elements than separate chaining.
D It cannot handle collisions efficiently.

Q 6: Which of the following is an advantage of using separate chaining for collision resolution?

A It is faster than open addressing.
B It results in a more compact table than open addressing.
C It can handle an arbitrary number of collisions.
D It requires less memory than open addressing.

Q 7: What is the load factor of a hash table?

A The number of elements in the table divided by the number of slots in the table.
B The number of collisions in the table divided by the number of elements in the table.
C The number of slots in the table divided by the number of elements in the table.
D The number of elements in the table divided by the size of the hash function.

Q 8: Which of the following is a common application of hash tables?

A Sorting data
B Storing data in a stack
C Storing data in a heap
D Implementing a dictionary or map

Q 9: What is a hash collision?

A When two or more keys map to the same index in the table.
B When the hash function produces a negative index.
C When the table is full and cannot store any more elements.
D When the load factor of the table exceeds a certain threshold.

Q 10: Which of the following is an example of a perfect hash function?

A A function that maps every key to the same index in the table.
B A function that maps every key to a unique index in the table.
C A function that maps every key to a random index in the table.
D A function that maps every key to an index based on its length.