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. What is the maximum height difference between the left and right subtrees in an AVL tree?
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Solution
In an AVL tree, the maximum height difference between the left and right subtrees of any node is 1 to maintain balance.
Correct Answer:
B
— 2
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Q. What is the maximum height of a Red-Black tree with n nodes?
A.
2n
B.
n
C.
log(n)
D.
2 log(n)
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Solution
The maximum height of a Red-Black tree is 2 log(n), which ensures that the tree remains balanced.
Correct Answer:
D
— 2 log(n)
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Q. What is the maximum height of an AVL tree with n nodes?
A.
O(log n)
B.
O(n)
C.
O(n log n)
D.
O(1)
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Solution
The maximum height of an AVL tree is O(log n), which ensures efficient operations.
Correct Answer:
A
— O(log n)
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Q. What is the maximum length of a CAT5e Ethernet cable segment?
A.
100 meters
B.
200 meters
C.
300 meters
D.
400 meters
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Solution
The maximum length of a CAT5e Ethernet cable segment is 100 meters for reliable data transmission.
Correct Answer:
A
— 100 meters
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Q. What is the maximum length of a standard Ethernet cable (Cat 5e)?
A.
50 meters
B.
100 meters
C.
200 meters
D.
300 meters
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Solution
The maximum length of a standard Ethernet cable (Cat 5e) is 100 meters for reliable data transmission.
Correct Answer:
B
— 100 meters
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Q. What is the maximum length of a standard Ethernet frame?
A.
1500 bytes
B.
1518 bytes
C.
1600 bytes
D.
9000 bytes
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Solution
The maximum length of a standard Ethernet frame is 1518 bytes, which includes the header and trailer.
Correct Answer:
B
— 1518 bytes
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Q. What is the maximum length of an IPv4 address?
A.
16 bits
B.
32 bits
C.
64 bits
D.
128 bits
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Solution
An IPv4 address is 32 bits long, allowing for approximately 4.3 billion unique addresses.
Correct Answer:
B
— 32 bits
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Q. What is the maximum number of comparisons needed to find an element in an array of size 1024 using binary search?
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Solution
The maximum number of comparisons is log2(1024) = 10, but since we start counting from 0, it takes 11 comparisons in the worst case.
Correct Answer:
B
— 11
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Q. What is the maximum number of comparisons needed to find an element in an array of size 16 using binary search?
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Solution
The maximum number of comparisons is log2(16) = 4, but since we count the initial comparison, it is 5.
Correct Answer:
B
— 5
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Q. What is the maximum number of hosts that can be accommodated in a subnet with a subnet mask of 255.255.255.224?
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Solution
A subnet mask of 255.255.255.224 provides 32 IP addresses, of which 30 are usable for hosts after accounting for the network and broadcast addresses.
Correct Answer:
A
— 30
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Q. What is the maximum number of hosts that can be accommodated in a subnet with a subnet mask of 255.255.255.240?
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Solution
A subnet mask of 255.255.255.240 provides 4 bits for host addresses, allowing for 2^4 - 2 = 14 usable hosts.
Correct Answer:
A
— 14
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Q. What is the maximum number of hosts that can be addressed in a /22 subnet?
A.
1022
B.
1024
C.
2046
D.
2048
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Solution
A /22 subnet has 2^(32-22) = 2^10 = 1024 total addresses. Subtracting 2 for the network and broadcast addresses leaves 1022 usable host addresses.
Correct Answer:
A
— 1022
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Q. What is the maximum number of hosts that can be addressed in a /24 subnet?
A.
254
B.
256
C.
512
D.
128
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Solution
A /24 subnet provides 256 IP addresses, but 2 are reserved (network and broadcast), leaving 254 usable addresses for hosts.
Correct Answer:
A
— 254
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Q. What is the maximum number of hosts that can be addressed in a /26 subnet?
A.
62
B.
64
C.
126
D.
128
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Solution
A /26 subnet has 64 IP addresses, but 2 are reserved (network and broadcast), leaving 62 usable host addresses.
Correct Answer:
A
— 62
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Q. What is the maximum number of hosts that can be addressed in a /29 subnet?
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Solution
A /29 subnet provides 8 total addresses, but 2 are reserved (network and broadcast), allowing for 6 usable host addresses.
Correct Answer:
B
— 6
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Q. What is the maximum number of hosts that can be addressed in a /30 subnet?
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Solution
A /30 subnet allows for 4 addresses, but only 2 are usable for hosts (1 for network and 1 for broadcast).
Correct Answer:
A
— 2
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Q. What is the maximum number of hosts that can be addressed in a Class C network?
A.
254
B.
256
C.
512
D.
1024
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Solution
In a Class C network, the maximum number of usable host addresses is 254, calculated as 2^8 - 2.
Correct Answer:
A
— 254
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Q. What is the maximum number of hosts that can be addressed in a subnet with a /26 prefix?
A.
62
B.
64
C.
126
D.
128
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Solution
A /26 subnet provides 64 IP addresses, but 2 are reserved (network and broadcast), leaving 62 usable host addresses.
Correct Answer:
A
— 62
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Q. What is the maximum number of hosts that can be addressed in a subnet with a /26 subnet mask?
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Solution
A /26 subnet mask allows for 64 total addresses, of which 62 can be assigned to hosts (2 addresses are reserved for network and broadcast).
Correct Answer:
A
— 62
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Q. What is the maximum number of hosts that can be addressed in a subnet with a /27 prefix?
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Solution
A /27 subnet provides 32 IP addresses, but 2 are reserved (network and broadcast), allowing for 30 usable hosts.
Correct Answer:
A
— 30
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Q. What is the maximum number of hosts that can be addressed in a subnet with a subnet mask of 255.255.255.128?
A.
126
B.
128
C.
254
D.
256
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Solution
A subnet mask of 255.255.255.128 allows for 2^7 - 2 = 126 usable host addresses (subtracting 2 for network and broadcast addresses).
Correct Answer:
A
— 126
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Q. What is the maximum number of iterations needed to find an element in an array of size 32 using binary search?
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Solution
The maximum number of iterations is log2(32) = 5, but since we count from 0, it can take up to 6 iterations.
Correct Answer:
C
— 7
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Q. What is the maximum number of nodes at level 'h' in a binary tree?
A.
h
B.
2^h
C.
2^(h+1) - 1
D.
h^2
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Solution
The maximum number of nodes at level 'h' in a binary tree is 2^h, where h is the height of the tree.
Correct Answer:
B
— 2^h
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Q. What is the maximum number of nodes at level 'h' of a binary tree?
A.
h
B.
2^h
C.
2^(h+1) - 1
D.
h^2
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Solution
The maximum number of nodes at level 'h' in a binary tree is 2^h, where h is the level number starting from 0.
Correct Answer:
B
— 2^h
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Q. What is the maximum number of nodes at level 'l' of a binary tree?
A.
l
B.
2^l
C.
2^(l+1) - 1
D.
l^2
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Solution
The maximum number of nodes at level 'l' of a binary tree is 2^l.
Correct Answer:
B
— 2^l
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Q. What is the maximum number of nodes in a binary tree of height h?
A.
h
B.
2^h - 1
C.
2^h
D.
h^2
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Solution
The maximum number of nodes in a binary tree of height h is given by the formula 2^h - 1.
Correct Answer:
B
— 2^h - 1
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Q. What is the maximum number of nodes in a Red-Black tree of height h?
A.
2^h
B.
2^(h+1)-1
C.
h^2
D.
h!
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Solution
The maximum number of nodes in a Red-Black tree of height h is 2^(h+1)-1.
Correct Answer:
B
— 2^(h+1)-1
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Q. What is the maximum number of nodes in an AVL tree of height h?
A.
2^h - 1
B.
2^(h+1) - 1
C.
Fibonacci(h+2) - 1
D.
h^2
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Solution
The maximum number of nodes in an AVL tree of height h is given by Fibonacci(h+2) - 1.
Correct Answer:
C
— Fibonacci(h+2) - 1
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Q. What is the maximum number of subnets that can be created from a Class B network with a /22 subnet mask?
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Solution
A /22 subnet mask allows for 2^(22-16) = 2^6 = 64 subnets from a Class B network.
Correct Answer:
C
— 64
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Q. What is the maximum number of subnets that can be created from a Class B network using a /30 subnet mask?
A.
64
B.
128
C.
1024
D.
256
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Solution
Using a /30 subnet mask on a Class B network allows for 1024 subnets, as it borrows 2 bits from the host portion.
Correct Answer:
C
— 1024
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