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 layer of the OSI model does a switch operate at?
A.
Network Layer
B.
Transport Layer
C.
Data Link Layer
D.
Application Layer
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Solution
A switch operates at the Data Link Layer (Layer 2) of the OSI model, forwarding frames based on MAC addresses.
Correct Answer:
C
— Data Link Layer
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Q. Which layer of the OSI model does error detection and correction occur?
A.
Physical Layer
B.
Data Link Layer
C.
Network Layer
D.
Transport Layer
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Solution
Error detection and correction occur at the Data Link Layer (Layer 2) of the OSI model.
Correct Answer:
B
— Data Link Layer
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Q. Which layer of the OSI model does IP addressing operate?
A.
Application Layer
B.
Transport Layer
C.
Network Layer
D.
Physical Layer
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Solution
IP addressing operates at the Network Layer (Layer 3) of the OSI model, facilitating routing of packets.
Correct Answer:
C
— Network Layer
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Q. Which layer of the OSI model does the Ethernet protocol operate at?
A.
Physical Layer
B.
Data Link Layer
C.
Network Layer
D.
Transport Layer
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Solution
Ethernet operates at the Data Link Layer (Layer 2) of the OSI model.
Correct Answer:
B
— Data Link Layer
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Q. Which layer of the OSI model does the HTTP protocol operate on?
A.
Application Layer
B.
Transport Layer
C.
Network Layer
D.
Session Layer
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Solution
HTTP (Hypertext Transfer Protocol) operates at the Application Layer (Layer 7) of the OSI model.
Correct Answer:
A
— Application Layer
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Q. Which layer of the OSI model does the MAC address operate at?
A.
Application Layer
B.
Transport Layer
C.
Network Layer
D.
Data Link Layer
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Solution
The MAC address operates at the Data Link Layer of the OSI model, which is responsible for node-to-node data transfer.
Correct Answer:
D
— Data Link Layer
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Q. Which layer of the OSI model ensures error detection and correction?
A.
Physical Layer
B.
Data Link Layer
C.
Network Layer
D.
Transport Layer
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Solution
The Data Link Layer is responsible for error detection and correction through mechanisms like checksums and CRC.
Correct Answer:
B
— Data Link Layer
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Q. Which layer of the OSI model is responsible for data encryption and decryption?
A.
Transport Layer
B.
Session Layer
C.
Presentation Layer
D.
Application Layer
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Solution
The Presentation Layer (Layer 6) is responsible for data encryption and decryption, as well as data formatting.
Correct Answer:
C
— Presentation Layer
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Q. Which layer of the OSI model is responsible for data formatting and encryption?
A.
Session Layer
B.
Presentation Layer
C.
Transport Layer
D.
Network Layer
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Solution
The Presentation Layer (Layer 6) is responsible for data formatting, encryption, and translation between different data formats.
Correct Answer:
B
— Presentation Layer
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Q. Which layer of the OSI model is responsible for end-to-end communication and error recovery?
A.
Application Layer
B.
Transport Layer
C.
Network Layer
D.
Data Link Layer
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Solution
The Transport Layer (Layer 4) is responsible for end-to-end communication and error recovery, ensuring reliable data transfer.
Correct Answer:
B
— Transport Layer
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Q. Which layer of the OSI model is responsible for error detection and correction?
A.
Physical Layer
B.
Data Link Layer
C.
Network Layer
D.
Transport Layer
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Solution
The Data Link Layer (Layer 2) is responsible for error detection and correction in frames.
Correct Answer:
B
— Data Link Layer
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Q. Which layer of the OSI model is responsible for establishing, managing, and terminating sessions?
A.
Transport Layer
B.
Session Layer
C.
Application Layer
D.
Network Layer
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Solution
The Session Layer (Layer 5) is responsible for establishing, managing, and terminating sessions between applications.
Correct Answer:
B
— Session Layer
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Q. Which layer of the OSI model is responsible for establishing, managing, and terminating connections?
A.
Session Layer
B.
Transport Layer
C.
Network Layer
D.
Data Link Layer
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Solution
The Session Layer (Layer 5) is responsible for establishing, managing, and terminating connections between applications.
Correct Answer:
A
— Session Layer
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Q. Which layer of the OSI model is responsible for logical addressing?
A.
Transport Layer
B.
Network Layer
C.
Session Layer
D.
Application Layer
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Solution
The Network Layer (Layer 3) is responsible for logical addressing, such as IP addresses, to route packets across networks.
Correct Answer:
B
— Network Layer
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Q. Which layer of the OSI model is responsible for routing packets between networks?
A.
Transport Layer
B.
Network Layer
C.
Session Layer
D.
Application Layer
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Solution
The Network Layer is responsible for routing packets between different networks.
Correct Answer:
B
— Network Layer
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Q. Which layer of the OSI model is responsible for session establishment, maintenance, and termination?
A.
Transport Layer
B.
Session Layer
C.
Presentation Layer
D.
Application Layer
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Solution
The Session Layer is responsible for establishing, maintaining, and terminating sessions between applications.
Correct Answer:
B
— Session Layer
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Q. Which layer of the OSI model is responsible for session management?
A.
Transport Layer
B.
Session Layer
C.
Presentation Layer
D.
Application Layer
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Solution
The Session Layer (Layer 5) is responsible for managing sessions between applications, establishing, maintaining, and terminating connections.
Correct Answer:
B
— Session Layer
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Q. Which layer of the OSI model provides services to the user applications?
A.
Transport Layer
B.
Network Layer
C.
Application Layer
D.
Data Link Layer
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Solution
The Application Layer provides services directly to user applications.
Correct Answer:
C
— Application Layer
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Q. Which layer of the TCP/IP model corresponds to the Application Layer of the OSI model?
A.
Network Layer
B.
Transport Layer
C.
Application Layer
D.
Data Link Layer
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Solution
The Application Layer of the TCP/IP model corresponds directly to the Application Layer of the OSI model, handling high-level protocols and user interfaces.
Correct Answer:
C
— Application Layer
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Q. Which layer of the TCP/IP model corresponds to the Network layer of the OSI model?
A.
Application Layer
B.
Transport Layer
C.
Internet Layer
D.
Link Layer
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Solution
The Internet Layer of the TCP/IP model corresponds to the Network layer of the OSI model.
Correct Answer:
C
— Internet Layer
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Q. Which layer of the TCP/IP model corresponds to the OSI model's Network Layer?
A.
Application Layer
B.
Transport Layer
C.
Internet Layer
D.
Link Layer
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Solution
The Internet Layer of the TCP/IP model corresponds to the Network Layer of the OSI model, handling routing and addressing.
Correct Answer:
C
— Internet Layer
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Q. Which layer of the TCP/IP model corresponds to the OSI model's Transport layer?
A.
Application
B.
Internet
C.
Transport
D.
Network Access
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Solution
The Transport layer in the TCP/IP model corresponds directly to the Transport layer in the OSI model.
Correct Answer:
C
— Transport
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Q. Which layer of the TCP/IP model corresponds to the Transport Layer of the OSI model?
A.
Application Layer
B.
Internet Layer
C.
Transport Layer
D.
Network Interface Layer
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Solution
The Transport Layer in the TCP/IP model corresponds directly to the Transport Layer of the OSI model.
Correct Answer:
C
— Transport Layer
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Q. Which method can be used to determine the optimal number of clusters in K-Means?
A.
Elbow Method
B.
Cross-Validation
C.
Grid Search
D.
Random Search
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Solution
The Elbow Method helps to determine the optimal number of clusters by plotting the explained variance.
Correct Answer:
A
— Elbow Method
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Q. Which method is commonly used for model selection in machine learning?
A.
K-fold Cross-Validation
B.
Grid Search
C.
Random Search
D.
All of the above
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Solution
All of these methods are used for model selection to evaluate and compare the performance of different models.
Correct Answer:
D
— All of the above
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Q. Which metric is best for imbalanced datasets?
A.
Accuracy
B.
F1 Score
C.
Precision
D.
Recall
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Solution
F1 Score is the harmonic mean of precision and recall, making it a better metric for imbalanced datasets where one class is more significant than the other.
Correct Answer:
B
— F1 Score
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Q. Which metric is best suited for evaluating a model on imbalanced datasets?
A.
F1 Score
B.
Accuracy
C.
Precision
D.
Recall
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Solution
F1 Score is the harmonic mean of precision and recall, making it suitable for imbalanced datasets.
Correct Answer:
A
— F1 Score
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Q. Which metric is best suited for evaluating a model's performance on an imbalanced dataset?
A.
Accuracy
B.
Precision
C.
Recall
D.
F1 Score
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Solution
F1 Score is a better metric for imbalanced datasets as it considers both precision and recall, providing a balance between them.
Correct Answer:
D
— F1 Score
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Q. Which metric is best suited for evaluating a multi-class classification model?
A.
Mean Absolute Error
B.
F1 Score
C.
Root Mean Squared Error
D.
R-squared
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Solution
F1 Score is a suitable metric for evaluating multi-class classification models as it considers both precision and recall.
Correct Answer:
B
— F1 Score
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Q. Which metric is best suited for imbalanced classification problems?
A.
Accuracy
B.
Precision
C.
Recall
D.
F1 Score
Show solution
Solution
The F1 Score is preferred in imbalanced classification problems as it considers both precision and recall.
Correct Answer:
D
— F1 Score
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