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MCQ தேர்வு
Q1
Which CPU scheduling algorithm can cause starvation even when the system is not overloaded?
A
Round Robin
B
First Come First Served
C
Shortest Job First
D
Multilevel Queue with Round Robin only
Q2
What is the primary purpose of a foreign key constraint in a relational database?
A
Prevent duplicate column names
B
Maintain referential integrity
C
Encrypt table contents
D
Improve CPU scheduling
Q3
Which cryptographic hash property makes it computationally difficult to find two different inputs producing the same hash?
A
Collision resistance
B
Key exchange
C
Forwarding
D
Compression ratio
Q4
Which software testing technique examines internal program logic, paths, branches and conditions?
A
Black-box testing
B
White-box testing
C
Acceptance testing only
D
Alpha testing only
Q5
Which algorithm can find shortest paths from a single source in a graph containing negative-weight edges, provided there is no reachable negative cycle?
A
Dijkstra
B
Bellman-Ford
C
Prim
D
Kruskal
Q6
Which protocol is primarily used to securely transfer files over an SSH connection?
A
SFTP
B
FTP
C
TFTP
D
Telnet
Q7
Which protocol is connectionless and does not guarantee delivery, ordering or duplicate protection at the transport layer?
A
TCP
B
UDP
C
HTTP
D
SSH
Q8
For a hash table using separate chaining, what is the expected average search complexity under a uniform hashing assumption?
A
O(1 + alpha)
B
O(log n)
C
O(n log n)
D
O(n^2)
Q9
What is the worst-case time complexity of Floyd-Warshall all-pairs shortest path algorithm?
A
O(V)
B
O(V log V)
C
O(V^2)
D
O(V^3)
Q10
Which principle states that software entities should be open for extension but closed for modification?
A
Single Responsibility Principle
B
Open-Closed Principle
C
Liskov Substitution Principle
D
Dependency Inversion Principle
Q11
Which algorithm is used by Ethernet switches to determine the shortest path through a network topology?
A
Spanning Tree Protocol
B
RIP
C
BGP
D
SMTP
Q12
Which CAP theorem property means that every request receives a response indicating success or failure without guaranteeing the most recent data?
A
Consistency
B
Availability
C
Partition tolerance
D
Atomicity
Q13
Which RAID level uses block-level striping with distributed parity?
A
RAID 0
B
RAID 1
C
RAID 5
D
RAID 10
Q14
Which protocol is primarily responsible for mapping an IPv4 address to a MAC address on a local network?
A
DNS
B
ARP
C
ICMP
D
SMTP
Q15
In a distributed system, what does the term split-brain primarily describe?
A
Complete loss of all network connectivity
B
Multiple system partitions independently believing they are authoritative
C
CPU overheating
D
Database normalization failure
Q16
Which synchronization primitive is specifically designed to allow only one thread at a time to enter a critical section?
A
Mutex
B
Cache
C
Page table
D
Socket
Q17
Which property of an algorithm guarantees that it eventually terminates after a finite number of steps?
A
Definiteness
B
Finiteness
C
Input
D
Output
Q18
Which compiler optimization eliminates repeated computation of the same expression when its operands have not changed?
A
Loop unrolling
B
Common subexpression elimination
C
Dead code insertion
D
Register spilling
Q19
Which technique is commonly used to reduce overfitting in neural networks by randomly disabling a fraction of neurons during training?
A
Pooling
B
Dropout
C
Tokenization
D
Quantization only
Q20
Which type of SQL JOIN returns every row from the left relation and matching rows from the right relation?
A
INNER JOIN
B
RIGHT JOIN
C
LEFT OUTER JOIN
D
CROSS JOIN
Q21
In an AVL tree, what is the maximum allowed absolute difference between the heights of the left and right subtrees of any node?
A
0
B
1
C
2
D
log n
Q22
Which operating system technique moves an entire process between main memory and secondary storage?
A
Paging
B
Swapping
C
Segmentation only
D
Spooling
Q23
Which statement about a deadlock in an operating system is correct?
A
It requires only mutual exclusion
B
It requires all four Coffman conditions simultaneously
C
It can occur only in single-process systems
D
It is always prevented by preemption
Q24
Which RAID configuration provides disk mirroring without striping?
A
RAID 0
B
RAID 1
C
RAID 5
D
RAID 6
Q25
Which page replacement algorithm can exhibit Beladys anomaly?
A
LRU
B
Optimal
C
FIFO
D
LFU
Q26
Which DNS record type maps a domain name directly to an IPv4 address?
A
AAAA
B
CNAME
C
A
D
MX
Q27
Which data structure provides amortized O(1) insertion at the end and O(1) random access when implemented as a dynamic array?
A
Linked list
B
Dynamic array
C
Binary search tree
D
Heap
Q28
Which principle of database transaction processing ensures that a transaction is treated as an indivisible unit?
A
Atomicity
B
Isolation
C
Durability
D
Indexing
Q29
In a relational database, which normal form specifically eliminates transitive functional dependencies of non-key attributes on a candidate key?
A
First Normal Form
B
Second Normal Form
C
Third Normal Form
D
Boyce-Codd Normal Form
Q30
Which TCP mechanism allows a sender to retransmit a packet before the retransmission timeout expires when sufficient duplicate ACKs are received?
A
Slow start
B
Fast retransmit
C
Flow control
D
Window scaling
Q31
Which attack exploits the fact that user-supplied input is incorporated into a database query without proper parameterization?
A
SQL injection
B
ARP spoofing
C
Denial of service
D
Packet sniffing
Q32
Which graph traversal guarantees the shortest path in an unweighted graph?
A
Depth First Search
B
Breadth First Search
C
Prim algorithm
D
Topological sort
Q33
What is the maximum number of edges in a simple undirected graph containing n vertices?
A
n^2
B
n(n - 1)
C
n(n - 1) / 2
D
2n
Q34
Which SQL clause is used to eliminate duplicate rows from the result of a SELECT query?
A
UNIQUE
B
DISTINCT
C
GROUP
D
DEDUP
Q35
Which concurrency problem occurs when two or more transactions read and write shared data in such a way that the final result depends on execution order?
A
Race condition
B
Compilation error
C
Fragmentation
D
Paging
Q36
Which database index structure is particularly suitable for range queries?
A
B-tree
B
Unordered hash table
C
Stack
D
Bitmap image
Q37
Which algorithm is commonly used to find strongly connected components in a directed graph?
A
Kruskal only
B
Kosarajus algorithm
C
Dijkstra only
D
Prim only
Q38
In TCP congestion control, which mechanism primarily detects congestion through packet loss or timeout and reduces the congestion window?
A
ARP
B
Slow start and congestion avoidance
C
DNS
D
DHCP
Q39
Which algorithm has O(V + E) time complexity for finding a topological ordering of a directed acyclic graph?
A
Dijkstra
B
BFS or DFS based topological sort
C
Floyd-Warshall
D
Prim
Q40
What is the worst-case time complexity of inserting n keys into an initially empty binary search tree when the keys are already sorted?
A
O(n)
B
O(log n)
C
O(n log n)
D
O(n^2)
Q41
What is the primary purpose of a TLB in a virtual memory system?
A
Store recently used disk blocks
B
Cache virtual-to-physical address translations
C
Execute privileged instructions
D
Manage CPU scheduling
Q42
Which scheduling algorithm is generally optimal for minimizing average waiting time when all process burst times are known in advance?
A
FCFS
B
SJF
C
Round Robin
D
Priority scheduling
Q43
Which data structure is most appropriate for implementing Dijkstras algorithm efficiently on a sparse graph?
A
Stack
B
Binary heap based priority queue
C
Hash table only
D
Circular queue
Q44
Which property of a transaction guarantees that committed changes survive a subsequent system failure?
A
Atomicity
B
Consistency
C
Isolation
D
Durability
Q45
Which compiler phase is primarily responsible for constructing an abstract syntax tree from tokens?
A
Lexical analysis
B
Syntax analysis
C
Code optimization
D
Code generation
Q46
In a B+ tree of order m, what is the maximum number of children that an internal node can have?
A
m
B
m - 1
C
2m
D
m + 1
Q47
Which SQL operation is logically evaluated before the HAVING clause?
A
SELECT
B
GROUP BY
C
ORDER BY
D
LIMIT
Q48
Which HTTP status code indicates that the server successfully processed the request but is not returning a response body?
A
200
B
201
C
204
D
304
Q49
Which algorithm is used to construct a minimum spanning tree by repeatedly selecting the minimum-weight edge that does not create a cycle?
A
Kruskal algorithm
B
Dijkstra algorithm
C
Bellman-Ford algorithm
D
Floyd-Warshall algorithm
Q50
Which language recognition class corresponds to languages accepted by a deterministic finite automaton?
A
Context-free languages
B
Regular languages
C
Context-sensitive languages
D
Recursively enumerable languages
Q51
Which normal form requires every determinant in a functional dependency to be a candidate key or superkey?
A
1NF
B
2NF
C
3NF
D
BCNF
Q52
Which machine learning problem occurs when a model performs extremely well on training data but poorly on unseen data?
A
Underfitting
B
Overfitting
C
Normalization
D
Regularization
Q53
Which IPv4 mechanism allows multiple private hosts to share one public IPv4 address by translating network addresses and ports?
A
DNS
B
NAT/PAT
C
ARP
D
ICMP
Q54
Which data structure is required for an iterative depth-first search implementation?
A
Queue
B
Stack
C
Priority queue
D
Hash table only
Q55
Which virtual machine technology allows multiple operating systems to share the same physical hardware through a hypervisor?
A
Virtualization
B
Defragmentation
C
Compilation
D
Spooling
Q56
Which OS concept allows a process to use an address space larger than the available physical memory?
A
Spooling
B
Virtual memory
C
Deadlock
D
Context switching
Q57
Which cryptographic property prevents an attacker from deriving the private key from the public key in a secure public-key system?
A
Compression
B
Computational hardness of the underlying mathematical problem
C
Packet fragmentation
D
Data normalization
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