Hashing — Part 1 MCQs with Explanations

To provide constant time complexity for searches. is the correct answer to “What is the primary purpose of hashing in data structures”. This question is standard in competitive examination syllabi for Hashing.

When two keys hash to the same index. is the correct answer to “In hashing, what is a "collision"”. This question is standard in competitive examination syllabi for Hashing.

Linear probing is the correct answer to “Which of the following is a common method to handle collisions in hashing”. This question is standard in competitive examination syllabi for Hashing.

To map data to a fixed-size value. is the correct answer to “What is a hash function primarily used for in hashing”. This question is standard in competitive examination syllabi for Hashing.

Double hashing is the correct answer to “Which collision resolution technique involves using a secondary hash function”. This question is standard in competitive examination syllabi for Hashing.

O(1) is the correct answer to “What is the time complexity of searching for an element in a well-distributed hash table using chaining”. This question is standard in competitive examination syllabi for Hashing.

The ratio of the number of elements to the number of slots. is the correct answer to “What does "load factor" represent in hashing”. This question is standard in competitive examination syllabi for Hashing.

Produces random and unpredictable results. is the correct answer to “Which of the following is NOT a typical property of a good hash function”. This question is standard in competitive examination syllabi for Hashing.

Reduced memory usage. is the correct answer to “What is the primary advantage of open addressing over chaining in hash tables”. This question is standard in competitive examination syllabi for Hashing.

The next slot is checked sequentially. is the correct answer to “In a hash table with linear probing, what happens if the desired slot is occupied”. This question is standard in competitive examination syllabi for Hashing.

The process of resizing and rehashing all elements when the table is full. is the correct answer to “What is "rehashing" in the context of hash tables”. This question is standard in competitive examination syllabi for Hashing.

Chaining is the correct answer to “What type of hash table collision resolution involves storing a list of all elements that hash to the same index”. This question is standard in competitive examination syllabi for Hashing.

Universal hashing is the correct answer to “Which of the following hash functions provides the best performance for a hash table”. This question is standard in competitive examination syllabi for Hashing.

By increasing the size of the hash table and using a good hash function. is the correct answer to “How can you improve the performance of a hash table”. This question is standard in competitive examination syllabi for Hashing.

Clustering of elements can occur. is the correct answer to “What is the main drawback of using linear probing in hash tables”. This question is standard in competitive examination syllabi for Hashing.

Increased memory usage due to the storage of pointers. is the correct answer to “Which of the following is a disadvantage of using chaining for collision resolution in hash tables”. This question is standard in competitive examination syllabi for Hashing.

To uniformly distribute keys across the hash table. is the correct answer to “What is the main goal of a good hash function”. This question is standard in competitive examination syllabi for Hashing.

Using probing techniques to find an open slot. is the correct answer to “How is a hash table implemented in the case of open addressing”. This question is standard in competitive examination syllabi for Hashing.

Quadratic probing is the correct answer to “Which probing technique uses a quadratic function to resolve collisions”. This question is standard in competitive examination syllabi for Hashing.

The next available slot is searched. is the correct answer to “What happens if a hash function returns an index that is already occupied in a hash table using open addressing”. This question is standard in competitive examination syllabi for Hashing.

Reduces clustering of elements. is the correct answer to “What is the main advantage of using double hashing over linear probing”. This question is standard in competitive examination syllabi for Hashing.

Double hashing is the correct answer to “Which method for collision resolution involves adding a new hash function to handle collisions”. This question is standard in competitive examination syllabi for Hashing.

When the hash table is highly dynamic and frequently grows. is the correct answer to “In which scenario would you prefer chaining over open addressing for collision resolution”. This question is standard in competitive examination syllabi for Hashing.

Increased number of collisions. is the correct answer to “What is the effect of a high load factor on the performance of a hash table”. This question is standard in competitive examination syllabi for Hashing.

Universal hashing is the correct answer to “Which of the following hash functions is used to reduce the possibility of clustering”. This question is standard in competitive examination syllabi for Hashing.

Chaining is the correct answer to “What technique is used to convert a hash table from an array-based to a linked-list-based implementation”. This question is standard in competitive examination syllabi for Hashing.

Increased number of collisions and poor distribution of keys. is the correct answer to “What is the primary disadvantage of using a hash function with poor randomness”. This question is standard in competitive examination syllabi for Hashing.

It increases the size of the hash table and re-calculates indices for all elements. is the correct answer to “How does rehashing affect a hash table”. This question is standard in competitive examination syllabi for Hashing.

When the table size is not a prime number. is the correct answer to “In which case is the division method hash function less effective”. This question is standard in competitive examination syllabi for Hashing.

Chaining is the correct answer to “Which hash table technique requires additional space for linked lists at each index”. This question is standard in competitive examination syllabi for Hashing.

To handle cases where multiple keys hash to the same index. is the correct answer to “What is the purpose of a "hash collision resolution" technique”. This question is standard in competitive examination syllabi for Hashing.

Universal hashing is the correct answer to “Which of the following hash functions provides a uniform distribution of hash values”. This question is standard in competitive examination syllabi for Hashing.

Increased number of collisions and reduced efficiency. is the correct answer to “What is the result of a poor choice of hash function on a hash table's performance”. This question is standard in competitive examination syllabi for Hashing.

A slot in the hash table where elements are stored. is the correct answer to “What does the term "bucket" refer to in the context of hashing with chaining”. This question is standard in competitive examination syllabi for Hashing.

The hash table is resized and all elements are rehashed to new indices. is the correct answer to “What happens during "rehashing" in a hash table”. This question is standard in competitive examination syllabi for Hashing.

By searching sequentially for the next available slot. is the correct answer to “How does linear probing handle collisions in a hash table”. This question is standard in competitive examination syllabi for Hashing.

It may lead to secondary clustering. is the correct answer to “What is a common drawback of quadratic probing in hash tables”. This question is standard in competitive examination syllabi for Hashing.

Sorting elements is the correct answer to “Which of the following operations is not commonly used in hash table implementations”. This question is standard in competitive examination syllabi for Hashing.

It generally reduces the load factor and collisions. is the correct answer to “What is the effect of increasing the size of a hash table on performance”. This question is standard in competitive examination syllabi for Hashing.

Quadratic probing is the correct answer to “Which probing method is best suited for reducing clustering in a hash table”. This question is standard in competitive examination syllabi for Hashing.