✅ WBJEE JECA Computer Applications – Mock Test 1 (50 Questions with Answer)
1. What is the size of int data type (in bytes) in most modern C compilers?
a. 8
b. 4
c. 2
d. 1
Answer: b
2. Which of the following is not a valid C variable name?
a. total_marks
b. 2marks
c. marks2
d. _marks
Answer: b
3. What does scanf("%d", &x); do?
a. Prints an integer
b. Takes integer input
c. Takes float input
d. None
Answer: b
4. Which operator has the highest precedence?
a. +
b. *
c. =
d. ()
Answer: d
5. if-else is an example of:
a. Loop
b. Jump
c. Selection
d. Assignment
Answer: c
6. Which loop checks condition before execution?
a. do-while
b. while
c. goto
d. switch
Answer: b
7. What is the default return type of a C function?
a. float
b. int
c. void
d. char
Answer: b
8. An array index in C starts from:
a. 0
b. 1
c. -1
d. Depends
Answer: a
9. A pointer stores:
a. Value
b. Address
c. Data type
d. None
Answer: b
10. strcpy() is defined in:
a. stdio.h
b. math.h
c. string.h
d. stdlib.h
Answer: c
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11. Structure is:
a. Collection of similar data
b. Collection of different data types
c. Only int values
d. Pointer data
Answer: b
12. Which is true about union in C?
a. Stores multiple values at once
b. Shares memory
c. Same as structure
d. None
Answer: b
13. Which is not a preprocessor directive?
a. #define
b. #include
c. #pragma
d. #main
Answer: d
14. Command line arguments are accessed via:
a. main()
b. scanf()
c. getc()
d. argv[]
Answer: d
15. OOP is based on:
a. Functions
b. Classes
c. Procedures
d. Arrays
Answer: b
16. Function overloading means:
a. Same name, different parameters
b. Many functions in one
c. Static functions
d. Unused functions
Answer: a
17. 'this' pointer refers to:
a. Global variable
b. Current object
c. Previous class
d. None
Answer: b
18. Constructor is:
a. Any function
b. Special function with same name as class
c. Main function
d. Destructor
Answer: b
19. Virtual function is used in:
a. Overriding
b. Overloading
c. Static members
d. None
Answer: a
20. Abstract class has:
a. No member
b. At least one pure virtual function
c. All concrete methods
d. None
Answer: b
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21. Which is a UNIX command?
a. ps
b. vi
c. mv
d. All
Answer: d
22. Command to list current directory?
a. pwd
b. mv
c. ps
d. rm
Answer: a
23. chmod is used to:
a. Rename file
b. Change permission
c. Delete file
d. Copy file
Answer: b
24. Command to count words:
a. sort
b. wc
c. cat
d. echo
Answer: b
25. Shell script is:
a. Compiled
b. Executed line-by-line
c. Not executable
d. None
Answer: b
---
26. Stack follows:
a. FIFO
b. LIFO
c. Random
d. None
Answer: b
27. Insertion in queue is called:
a. Enqueue
b. Push
c. Pop
d. Delete
Answer: a
28. Binary search complexity:
a. O(n)
b. O(log n)
c. O(n log n)
d. O(1)
Answer: b
29. Inorder traversal of binary tree:
a. Left, Root, Right
b. Root, Left, Right
c. Right, Left, Root
d. None
Answer: a
30. Graph is:
a. Tree
b. Circular Queue
c. Non-linear
d. Array
Answer: c
---
31. Interrupt transfers control to:
a. RAM
b. Subroutine
c. I/O
d. CPU
Answer: b
32. DMA stands for:
a. Digital Memory Access
b. Direct Memory Access
c. Data Management Access
d. None
Answer: b
33. Which is volatile memory?
a. ROM
b. RAM
c. HDD
d. SSD
Answer: b
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34. Scheduling algorithm in OS:
a. FIFO
b. Round Robin
c. Priority
d. All
Answer: d
35. Deadlock requires:
a. Mutual exclusion
b. Hold and wait
c. No preemption
d. All
Answer: d
36. Page replacement algorithm:
a. FIFO
b. LRU
c. Optimal
d. All
Answer: d
---
37. TCP is:
a. Connectionless
b. Connection-oriented
c. Datagram protocol
d. None
Answer: b
38. IPv6 address size:
a. 32-bit
b. 64-bit
c. 128-bit
d. 256-bit
Answer: c
39. DNS stands for:
a. Domain Network Server
b. Domain Name System
c. Direct Network Setup
d. None
Answer: b
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40. SQL is:
a. Procedural
b. Declarative
c. High-level programming
d. None
Answer: b
41. Primary key:
a. Duplicate allowed
b. Must be NULL
c. Unique + NOT NULL
d. Foreign key
Answer: c
42. Which is valid Normal Form?
a. 1NF
b. 2NF
c. 3NF
d. All
Answer: d
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43. Waterfall model is:
a. Agile model
b. Linear sequential model
c. Iterative
d. Spiral
Answer: b
44. Requirement engineering involves:
a. Gathering needs
b. Writing code
c. Designing DB
d. All
Answer: a
45. Testing where full software is tested:
a. Unit
b. System
c. Integration
d. Alpha
Answer: b
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46. Classification is a type of:
a. Clustering
b. Supervised learning
c. Unsupervised learning
d. Reinforcement
Answer: b
47. Decision tree splits data by:
a. Distance
b. Entropy/information gain
c. Centroid
d. Weight
Answer: b
48. ANN is inspired by:
a. Trees
b. Graphs
c. Human brain
d. CPU
Answer: c
49. SVM finds:
a. Closest points
b. Decision boundary
c. Clusters
d. None
Answer: b
50. HMM is used in:
a. Time series
b. Image processing
c. Sorting
d. Database
Answer: a
