Computer Science
Multiple Choice
Questions
(MCQs) – Sets 47
with Detailed Explanations
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SET 47 – Computer Science MCQs
✅ No repetition from Sets 1–46
✅ 10 completely new questions
✅ Each explanation
Level: Class 9–10 / Beginners
1. What is an algorithm?
A. Programming error
B. Flowchart symbol
C. Step-by-step procedure to solve a problem
D. Output device
✅ Correct Answer: C
Explanation:
An algorithm is a clear, step-by-step set of instructions used to solve a specific problem or perform a task. Algorithms are written before coding to plan the logic of a program. They help in understanding, debugging, and improving program efficiency.
2. What is a flowchart?
A. Programming language
B. Graphical representation of algorithm
C. Hardware component
D. Compiler
✅ Correct Answer: B
Explanation:
A flowchart is a diagrammatic representation of an algorithm using standard symbols. It shows the flow of control and decision-making in a program. Flowcharts help beginners understand program logic visually and make complex processes easier to follow.
3. What does oval symbol represent in flowchart?
A. Input/Output
B. Processing
C. Start/Stop
D. Decision
✅ Correct Answer: C
Explanation:
The oval symbol in a flowchart represents the start or end of a program. It indicates where the algorithm begins and finishes. This symbol helps clearly define the boundaries of a process, making the flowchart easy to understand.
4. What does parallelogram symbol represent?
A. Processing
B. Decision
C. Input/Output
D. Flow line
✅ Correct Answer: C
Explanation:
The parallelogram symbol is used for input and output operations in a flowchart. It represents reading input from the user or displaying output. Using standard symbols ensures clarity and consistency in algorithm representation.
5. What does diamond symbol represent?
A. Start
B. Process
C. Decision making
D. Output
✅ Correct Answer: C
Explanation:
The diamond symbol represents a decision point in a flowchart. It is used when a condition must be tested, resulting in true or false paths. Decision symbols allow branching in program logic based on conditions.
6. What does rectangle symbol represent?
A. Input
B. Output
C. Processing
D. Decision
✅ Correct Answer: C
Explanation:
The rectangle symbol in a flowchart represents processing steps such as calculations or data manipulation. It shows where instructions are executed. Rectangles form the core logic blocks in most algorithms.
7. What is flow line?
A. Error line
B. Data type
C. Shows direction of flow
D. Decision symbol
✅ Correct Answer: C
Explanation:
A flow line is used to connect symbols in a flowchart and show the direction of control flow. It helps trace the sequence of steps in an algorithm. Without flow lines, the flowchart would be unclear and confusing.
8. What is pseudo code?
A. Programming language
B. Machine code
C. Informal description of algorithm
D. Error code
✅ Correct Answer: C
Explanation:
Pseudo code is a simplified, informal way of writing program logic using plain language. It does not follow strict programming syntax. Pseudo code helps programmers plan logic before converting it into actual code.
9. What is debugging?
A. Writing program
B. Running program
C. Removing errors from program
D. Saving program
✅ Correct Answer: C
Explanation:
Debugging is the process of identifying and fixing errors in a program. Errors may cause incorrect results or program crashes. Debugging improves program accuracy and reliability and is an essential part of software development.
10. What is testing?
A. Writing code
B. Executing program to find errors
C. Deleting errors
D. Flowchart design
✅ Correct Answer: B
Explanation:
Testing involves running a program with different inputs to find errors and verify correctness. It ensures the program meets requirements and performs as expected. Testing helps improve quality before final deployment.
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