Free Mock Test : Data Structures and Algorithms : Array (Test 1)

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Free Mock Test - Data Structures and Algorithms : Array (Test 1)

In an effort to support computer science students, coding enthusiasts, and job seekers preparing for technical interviews, a comprehensive Free Online Data Structure Mock Test has been launched. The test is designed to help learners evaluate their understanding of fundamental and advanced data structure concepts through a structured and interactive assessment.
Data Structures form the backbone of computer science and software development. Topics such as Arrays, Linked Lists, Stacks, Queues, Trees, Graphs, Hashing, and Algorithms are frequently asked in academic examinations, coding competitions, and technical interviews conducted by leading technology companies.
The newly introduced mock test platform offers a wide range of multiple-choice questions (MCQs) covering beginner, intermediate, and advanced-level topics. Participants can assess their strengths and identify areas requiring further improvement through instant results and detailed explanations.

Total Questions : 29

Timer : sec

Question : What is an array?

Collection of different data types

Collection of elements of the same data type stored in contiguous memory locations

Collection of functions

Collection of classes

Question : The index of the first element in most programming language arrays is:

-1

Depends on array size

Question : What is the size of the array int arr[10]?

Depends on compiler

Question : Which operation takes O(1) time in an array?

Searching an unsorted array

Accessing an element by index

Inserting at beginning

Deleting from middle

Question : Which memory allocation is used for arrays?

Random

Linked

Contiguous

Distributed

Question : In an array of size 15, the last valid index is:

Question : Which data structure is best represented using arrays?

Stack

Queue

Matrix

Tree

Question : What happens if you access an invalid array index?

Compilation error

Runtime error or undefined behavior

Correct value returned

Program terminates immediately always

Question : Which traversal method visits every element exactly once?

Binary Search

Linear Traversal

Hashing

Recursion

Question : What is the time complexity of traversing an array of n elements?

O(1)

O(log n)

O(n)

O(n²)

Question : A 2D array is also known as:

Vector

Matrix

List

Queue

Question : How many elements are in a 4 × 5 matrix?

Question : In a matrix A[3][4], how many rows exist?

Question : Address calculation in row-major order depends on:

Number of rows

Number of columns

Data type only

Base address only

Question : Which representation is used by C language for multidimensional arrays?

Column-major

Row-major

Linked

Sparse

Question : What is the total number of elements in a 3D array A[2][3][4]?

Question : Which searching algorithm requires a sorted array?

Linear Search

Binary Search

Sequential Search

Traversal

Question : Worst-case complexity of binary search is:

O(1)

O(n)

O(log n)

O(n²)

Question : Inserting an element at the beginning of an array requires:

No shifting

Shifting all elements right

Shifting one element

Sorting

Question : What is the time complexity of insertion at the beginning?

O(1)

O(log n)

O(n)

O(n²)

Question : A sparse matrix is a matrix:

With equal rows and columns

Having mostly non-zero elements

Having mostly zero elements

With negative elements only

Question : A matrix of size 100 × 100 contains only 50 non-zero elements. It is:

Dense Matrix

Sparse Matrix

Identity Matrix

Diagonal Matrix

Question : Which representation saves memory for sparse matrices?

Full Matrix Storage

Linked List Representation

Triplet Representation

Both B and C

Question : In triplet representation, each non-zero element is stored as:

Row only

Column only

Value only

Row, Column, Value

Question : The first row in triplet representation generally contains:

Sum of elements

Matrix dimensions and number of non-zero elements

Matrix values

Index values only

Question : A 5 × 5 identity matrix has how many non-zero elements?

Question : Memory complexity of storing a sparse matrix in normal form is:

Depends on total matrix size

Depends only on non-zero elements

Constant

Logarithmic

Question : Which matrix is always sparse when its size becomes very large?

Identity Matrix

Dense Matrix

Random Matrix

Full Matrix

Question : For a sparse matrix with 1000 rows, 1000 columns, and 20 non-zero elements, triplet representation stores:

1,000,000 values

20 values only

21 rows of triplets (including header)

1000 rows

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