📘 সিলেবাস টপিকস:
✅ C Programming
✅ Object Oriented Programming (OOP)
✅ UNIX
✅ Data Structures
✅ Operating System
✅ DBMS
✅ Computer Networks
✅ Software Engineering
✅ Machine Learning
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✅ WBJEE JECA – Computer Applications – Mock Test 10 (50 MCQs with Answers)
🔵 C Programming
1. Which operator has the highest precedence in C?
a. +
b. *
c. ()
d. =
Answer: c
2. Which of the following is a loop in C?
a. if
b. for
c. switch
d. goto
Answer: b
3. sizeof(int) is usually:
a. 2 bytes
b. 4 bytes
c. 6 bytes
d. 8 bytes
Answer: b
4. Which function is used to concatenate strings?
a. strcpy
b. strcmp
c. strcat
d. strlen
Answer: c
5. NULL pointer points to:
a. Some address
b. 0
c. -1
d. Garbage
Answer: b
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🟢 Object Oriented Programming (OOP)
6. Which concept binds data and functions?
a. Polymorphism
b. Abstraction
c. Encapsulation
d. Inheritance
Answer: c
7. In C++, which access specifier allows access only inside class?
a. public
b. private
c. protected
d. static
Answer: b
8. Virtual function allows:
a. Static binding
b. Dynamic binding
c. Operator overloading
d. Constructor overloading
Answer: b
9. Inheritance improves:
a. Security
b. Speed
c. Code reusability
d. Compilation
Answer: c
10. Object is an instance of:
a. Function
b. Variable
c. Class
d. Operator
Answer: c
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🟡 UNIX
11. Which command displays calendar?
a. date
b. cal
c. calendar
d. today
Answer: b
12. Which command changes file ownership?
a. chmod
b. chown
c. change
d. chgrp
Answer: b
13. mv command is used for:
a. Move files
b. Copy files
c. Read files
d. Execute files
Answer: a
14. Shell script files usually have extension:
a. .txt
b. .sh
c. .c
d. .exe
Answer: b
15. wc command shows:
a. Word count
b. CPU usage
c. Memory
d. Disk space
Answer: a
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🔴 Data Structures
16. Which data structure is best for implementing recursion?
a. Queue
b. Array
c. Stack
d. Heap
Answer: c
17. Time complexity of linear search:
a. O(1)
b. O(n)
c. O(log n)
d. O(n log n)
Answer: b
18. Which traversal visits root first?
a. Inorder
b. Postorder
c. Preorder
d. Level order
Answer: c
19. Queue supports:
a. LIFO
b. FIFO
c. Random
d. None
Answer: b
20. Adjacency matrix is used to represent:
a. Arrays
b. Queues
c. Graphs
d. Trees
Answer: c
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🟣 Operating System
21. Which memory management technique allows non-contiguous allocation?
a. Paging
b. Segmentation
c. Swapping
d. Contiguous allocation
Answer: a
22. Deadlock prevention technique:
a. Wait and die
b. Preemption
c. Mutual exclusion
d. Semaphore
Answer: b
23. Process Control Block contains:
a. Process ID
b. Register state
c. Program counter
d. All of these
Answer: d
24. Which is not an OS?
a. Windows
b. Linux
c. Oracle
d. MacOS
Answer: c
25. Which algorithm is used in disk scheduling?
a. FCFS
b. SSTF
c. SCAN
d. All
Answer: d
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🟤 DBMS
26. CREATE TABLE is a:
a. DDL
b. DML
c. DCL
d. TCL
Answer: a
27. A foreign key must reference:
a. Primary key
b. Unique key
c. Composite key
d. Any key
Answer: a
28. Which command removes all records but keeps structure?
a. DROP
b. DELETE
c. TRUNCATE
d. ERASE
Answer: c
29. Which of the following is not a SQL clause?
a. WHERE
b. GROUP BY
c. ORDER BY
d. SORT
Answer: d
30. A relation in 2NF is also in:
a. 1NF
b. 3NF
c. BCNF
d. 4NF
Answer: a
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🔵 Computer Networks
31. Which device connects different networks?
a. Switch
b. Router
c. Hub
d. Bridge
Answer: b
32. FTP is used for:
a. Email
b. File Transfer
c. Browsing
d. DNS
Answer: b
33. Which protocol is connection-oriented?
a. UDP
b. IP
c. TCP
d. ARP
Answer: c
34. Which topology has a central node?
a. Ring
b. Bus
c. Star
d. Mesh
Answer: c
35. IP stands for:
a. Internet Protocol
b. Internal Path
c. Intermediate Protocol
d. Internet Pathway
Answer: a
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🟠 Software Engineering
36. Which of the following is not a phase of SDLC?
a. Planning
b. Coding
c. Execution
d. Maintenance
Answer: c
37. Design phase results in:
a. Code
b. Flowchart
c. DFD
d. Software architecture
Answer: d
38. Black box testing tests:
a. Source code
b. Design
c. Functionality
d. Loops
Answer: c
39. Spiral model combines:
a. Waterfall + Prototyping
b. Agile + Waterfall
c. Waterfall + Scrum
d. Iteration + Debugging
Answer: a
40. Who performs alpha testing?
a. Developer
b. Client
c. Tester
d. End user
Answer: a
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🟢 Machine Learning
41. Which ML technique is used when data is unlabeled?
a. Supervised
b. Unsupervised
c. Reinforcement
d. Semi-supervised
Answer: b
42. Which of the following is a supervised algorithm?
a. K-Means
b. PCA
c. Linear Regression
d. Clustering
Answer: c
43. Which algorithm can be used for both classification and regression?
a. Decision Tree
b. SVM
c. KNN
d. All of the above
Answer: d
44. What is used to evaluate classification model performance?
a. RMSE
b. MSE
c. Confusion Matrix
d. Clustering Score
Answer: c
45. Which one is a deep learning framework?
a. TensorFlow
b. SQL
c. Hadoop
d. Spark
Answer: a
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🧩 Mixed
46. Which loop is guaranteed to execute at least once?
a. for
b. while
c. do-while
d. goto
Answer: c
47. C language was developed in:
a. 1960
b. 1972
c. 1980
d. 1991
Answer: b
48. Which is not a relational DBMS?
a. MySQL
b. PostgreSQL
c. MongoDB
d. Oracle
Answer: c
49. Which command gives IP address in UNIX?
a. ipconfig
b. ifconfig
c. netstat
d. ping
Answer: b
50. free -m in UNIX displays:
a. CPU
b. Memory usage
c. Disk usage
d. Load average
Answer: b
