Computer Science & IT MCQ & Objective Questions
Computer Science & IT is a crucial subject for students preparing for school and competitive exams in India. Mastering this field not only enhances your understanding of technology but also significantly boosts your exam scores. Practicing MCQs and objective questions is an effective way to reinforce your knowledge and identify important questions that frequently appear in exams.
What You Will Practise Here
Fundamentals of Computer Science
Data Structures and Algorithms
Operating Systems Concepts
Networking Basics and Protocols
Database Management Systems
Software Engineering Principles
Programming Languages Overview
Exam Relevance
Computer Science & IT is an integral part of the curriculum for CBSE, State Boards, and competitive exams like NEET and JEE. Questions often focus on theoretical concepts, practical applications, and problem-solving skills. Common patterns include multiple-choice questions that test your understanding of key concepts, definitions, and the ability to apply knowledge in various scenarios.
Common Mistakes Students Make
Confusing similar concepts in data structures, such as arrays and linked lists.
Overlooking the importance of algorithms and their time complexities.
Misunderstanding the functions and roles of different operating system components.
Neglecting to practice coding problems, leading to difficulty in programming questions.
Failing to grasp the fundamentals of networking, which can lead to errors in related MCQs.
FAQs
Question: What are the best ways to prepare for Computer Science & IT exams?Answer: Regular practice of MCQs, understanding key concepts, and reviewing past exam papers are effective strategies.
Question: How can I improve my problem-solving skills in Computer Science?Answer: Engage in coding exercises, participate in study groups, and tackle a variety of practice questions.
Start your journey towards mastering Computer Science & IT today! Solve our practice MCQs to test your understanding and enhance your exam preparation. Remember, consistent practice is the key to success!
Q. Which of the following is a valid application of binary search?
A.
Finding the square root of a number
B.
Finding an element in a sorted array
C.
Sorting an array
D.
Searching in a hash table
Show solution
Solution
Binary search is specifically used for finding an element in a sorted array.
Correct Answer:
B
— Finding an element in a sorted array
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Q. Which of the following is a valid application of Dijkstra's algorithm?
A.
Finding the minimum spanning tree
B.
Finding the shortest path in a road network
C.
Finding strongly connected components
D.
Sorting a list of numbers
Show solution
Solution
Dijkstra's algorithm is commonly used to find the shortest path in a road network, where the edges represent distances or travel times.
Correct Answer:
B
— Finding the shortest path in a road network
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Q. Which of the following is a valid HTTP status code for a successful request?
A.
200
B.
301
C.
403
D.
500
Show solution
Solution
The HTTP status code 200 indicates a successful request, meaning the server has successfully processed the request.
Correct Answer:
A
— 200
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Q. Which of the following is a valid implementation detail of Dijkstra's algorithm?
A.
Using a depth-first search approach
B.
Updating the distance of adjacent nodes only if they are visited
C.
Using a priority queue to select the next node
D.
Storing all nodes in a single array
Show solution
Solution
Dijkstra's algorithm uses a priority queue to efficiently select the next node with the smallest tentative distance.
Correct Answer:
C
— Using a priority queue to select the next node
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Q. Which of the following is a valid implementation of binary search in Python?
A.
def binary_search(arr, target): ...
B.
def binary_search(arr, target): for i in arr: if i == target: return i
C.
def binary_search(arr, target): while arr: ...
D.
def binary_search(arr, target): return arr.index(target)
Show solution
Solution
The first option correctly defines a binary search function that takes a sorted array and a target value.
Correct Answer:
A
— def binary_search(arr, target): ...
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Q. Which of the following is a valid IPv4 address?
A.
192.168.1.256
B.
172.16.0.1
C.
10.0.0.999
D.
255.255.255.256
Show solution
Solution
A valid IPv4 address must be in the range of 0 to 255 for each octet. 172.16.0.1 is valid.
Correct Answer:
B
— 172.16.0.1
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Q. Which of the following is a valid operation for a queue?
A.
Push
B.
Pop
C.
Enqueue
D.
Dequeue
Show solution
Solution
In a queue, the operation to add an element is called 'enqueue', while 'dequeue' is used to remove an element.
Correct Answer:
C
— Enqueue
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Q. Which of the following is a valid operation for a stack?
A.
Enqueue
B.
Dequeue
C.
Push
D.
Insert
Show solution
Solution
Push is a valid operation for a stack, allowing you to add an element to the top of the stack.
Correct Answer:
C
— Push
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Q. Which of the following is a valid property of AVL trees?
A.
The height difference between left and right subtrees can be at most 2.
B.
Every node must be black.
C.
The height difference between left and right subtrees can be at most 1.
D.
All leaves are red.
Show solution
Solution
In AVL trees, the height difference between left and right subtrees can be at most 1.
Correct Answer:
C
— The height difference between left and right subtrees can be at most 1.
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Q. Which of the following is a valid property of Red-Black trees?
A.
The height of the tree is always even
B.
No two red nodes can be adjacent
C.
All nodes must have two children
D.
The root can be red
Show solution
Solution
In Red-Black trees, no two red nodes can be adjacent, which helps maintain balance and ensures that the tree does not become skewed.
Correct Answer:
B
— No two red nodes can be adjacent
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Q. Which of the following is a valid sequence of colors for a Red-Black tree?
A.
Red, Red, Black
B.
Black, Red, Black
C.
Red, Black, Red
D.
Black, Black, Red
Show solution
Solution
The sequence Black, Red, Black is valid as it adheres to the Red-Black tree properties.
Correct Answer:
B
— Black, Red, Black
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Q. Which of the following is a valid subnet mask for a Class C IP address?
A.
255.255.255.0
B.
255.255.0.0
C.
255.0.0.0
D.
255.255.255.255
Show solution
Solution
A Class C IP address typically uses a subnet mask of 255.255.255.0, allowing for 256 addresses in the subnet.
Correct Answer:
A
— 255.255.255.0
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Q. Which of the following is a valid use case for a stack?
A.
Undo functionality in applications
B.
Managing print jobs
C.
Handling requests in a web server
D.
All of the above
Show solution
Solution
A stack is commonly used for undo functionality in applications.
Correct Answer:
A
— Undo functionality in applications
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Q. Which of the following is a valid variable declaration in C?
A.
int 1number;
B.
float number1;
C.
char number#;
D.
double number@;
Show solution
Solution
The valid variable declaration in C is float number1; as variable names cannot start with a digit or contain special characters.
Correct Answer:
B
— float number1;
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Q. Which of the following is a valid way to append an element to a linked list in Python?
A.
list.append(value)
B.
linked_list.add(value)
C.
linked_list.append(value)
D.
list.add(value)
Show solution
Solution
In Python, a linked list typically has an append method defined, so linked_list.append(value) is correct.
Correct Answer:
C
— linked_list.append(value)
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Q. Which of the following is a valid way to implement a binary tree in C++?
A.
Using an array
B.
Using a linked list
C.
Using a struct
D.
All of the above
Show solution
Solution
A binary tree can be implemented using an array, a linked list, or a struct in C++. Each method has its own advantages and use cases.
Correct Answer:
D
— All of the above
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Q. Which of the following is a valid way to implement a binary tree in Python?
A.
Using a list
B.
Using a dictionary
C.
Using a class
D.
All of the above
Show solution
Solution
A binary tree can be implemented using various data structures in Python, including lists, dictionaries, and custom classes.
Correct Answer:
D
— All of the above
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Q. Which of the following is a valid way to implement a binary tree node in C++?
A.
struct Node { int data; Node* left; Node* right; };
B.
class Node { int data; Node left; Node right; };
C.
struct Node { int data; Node left; Node right; };
D.
class Node { public: int data; Node* left; Node* right; };
Show solution
Solution
The correct implementation uses pointers for left and right children, and the class should have public access for the members.
Correct Answer:
D
— class Node { public: int data; Node* left; Node* right; };
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Q. Which of the following is a valid way to implement a binary tree node in Python?
A.
class Node: def __init__(self, value): self.value = value
B.
class Node: def __init__(self, value): self.value = value; self.left = None; self.right = None
C.
class Node: def __init__(self): self.value = None
D.
class Node: def __init__(self, value): self.left = None; self.right = None
Show solution
Solution
A valid binary tree node implementation includes left and right pointers, allowing for the structure of a binary tree.
Correct Answer:
B
— class Node: def __init__(self, value): self.value = value; self.left = None; self.right = None
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Q. Which of the following is a valid way to represent a binary tree node in C++?
A.
struct Node { int data; Node* left; Node* right; };
B.
class Node { int data; Node* left; Node* right; };
C.
struct Node { int data; Node left; Node right; };
D.
class Node { int data; Node left; Node right; };
Show solution
Solution
The correct representation of a binary tree node in C++ is using a struct with pointers to the left and right children.
Correct Answer:
A
— struct Node { int data; Node* left; Node* right; };
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Q. Which of the following is an advantage of using intermediate code?
A.
It simplifies the parsing process
B.
It allows for easier debugging
C.
It enables machine-independent optimizations
D.
It eliminates the need for a front-end
Show solution
Solution
Intermediate code allows for optimizations that are independent of the target machine, making it easier to optimize across different architectures.
Correct Answer:
C
— It enables machine-independent optimizations
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Q. Which of the following is an application of a queue?
A.
Undo functionality in text editors
B.
Breadth-first search in graphs
C.
Expression evaluation
D.
Memory management
Show solution
Solution
Queues are used in breadth-first search algorithms for traversing graphs, as they process nodes in the order they are discovered.
Correct Answer:
B
— Breadth-first search in graphs
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Q. Which of the following is an application of clustering in real-world scenarios?
A.
Spam detection in emails
B.
Customer segmentation in marketing
C.
Predicting stock prices
D.
Image classification
Show solution
Solution
Customer segmentation in marketing uses clustering to group customers based on purchasing behavior.
Correct Answer:
B
— Customer segmentation in marketing
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Q. Which of the following is an application of Dijkstra's algorithm?
A.
Finding the shortest route in GPS navigation
B.
Sorting a list of numbers
C.
Searching for an element in a binary search tree
D.
Calculating the factorial of a number
Show solution
Solution
Dijkstra's algorithm is commonly used in GPS navigation systems to find the shortest route between locations.
Correct Answer:
A
— Finding the shortest route in GPS navigation
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Q. Which of the following is an application of queues?
A.
Undo functionality in text editors
B.
Breadth-first search in graphs
C.
Expression evaluation
D.
Memory management
Show solution
Solution
Queues are used in breadth-first search algorithms for traversing graphs, as they follow the FIFO (First In, First Out) principle.
Correct Answer:
B
— Breadth-first search in graphs
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Q. Which of the following is an example of a classification algorithm?
A.
Linear Regression
B.
Logistic Regression
C.
K-Means Clustering
D.
Principal Component Analysis
Show solution
Solution
Logistic Regression is a classification algorithm used to predict binary outcomes based on input features.
Correct Answer:
B
— Logistic Regression
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Q. Which of the following is an example of a cloud service?
A.
Google Drive
B.
Microsoft Word
C.
Adobe Photoshop
D.
Notepad
Show solution
Solution
Google Drive is an example of a cloud service.
Correct Answer:
A
— Google Drive
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Q. Which of the following is an example of a problem that can be solved using divide and conquer?
A.
Binary search
B.
Fibonacci sequence
C.
Linear search
D.
Bubble sort
Show solution
Solution
Binary search is an example of a divide and conquer algorithm, as it divides the search space in half.
Correct Answer:
A
— Binary search
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Q. Which of the following is an example of a problem that can be solved using dynamic programming?
A.
Finding the maximum sum of a contiguous subarray
B.
Finding the maximum element in an array
C.
Sorting an array of integers
D.
Searching for an element in an unsorted array
Show solution
Solution
Finding the maximum sum of a contiguous subarray can be solved using dynamic programming, specifically with Kadane's algorithm.
Correct Answer:
A
— Finding the maximum sum of a contiguous subarray
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Q. Which of the following is an example of a regression algorithm?
A.
K-Means
B.
Logistic Regression
C.
Random Forest
D.
Support Vector Classifier
Show solution
Solution
Logistic Regression is a regression algorithm used for predicting binary outcomes, despite its name suggesting classification.
Correct Answer:
B
— Logistic Regression
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