Computer Science
Multiple Choice
Questions
(MCQs) – Sets 45
with Detailed Explanations
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SET 45 – Computer Science MCQs
✅ No repetition from Sets 1–44
✅ 10 completely new questions
✅ Each explanation
Level: Class 9–10 / Beginners
1. What is control structure?
A. Data type
B. Variable
C. Structure that controls flow of program
D. Hardware unit
✅ Correct Answer: C
Explanation:
A control structure determines the order in which instructions in a program are executed. It allows decision-making, repetition, and sequence control. Common control structures include sequence, selection, and iteration. They help programs behave differently based on conditions.
2. What is sequence structure?
A. Random execution
B. Repeated execution
C. Instructions executed in order
D. Conditional execution
✅ Correct Answer: C
Explanation:
Sequence structure means program instructions are executed one after another in the order they are written. It is the simplest control structure and is used when no decision-making or repetition is required. Every program uses sequence at some level.
3. What is selection structure?
A. Loop structure
B. Executes all instructions
C. Chooses different paths based on condition
D. Error handling
✅ Correct Answer: C
Explanation:
Selection structure allows a program to choose different execution paths based on conditions. It uses statements like if, if-else, and switch. Selection structures help programs make decisions and respond differently to varying inputs.
4. What is iteration structure?
A. Single execution
B. Conditional execution
C. Repetition of instructions
D. Program termination
✅ Correct Answer: C
Explanation:
Iteration structure repeatedly executes a set of instructions as long as a condition remains true. Loops such as for, while, and do-while are examples. Iteration reduces code repetition and improves program efficiency.
5. What is loop?
A. Decision statement
B. Program error
C. Block of code executed repeatedly
D. Variable
✅ Correct Answer: C
Explanation:
A loop is a programming structure that repeats a block of code until a condition is met. Loops are useful for tasks that require repetition, such as printing numbers or processing lists. Proper loop control prevents infinite execution.
6. What is infinite loop?
A. Loop runs once
B. Loop never executes
C. Loop that never ends
D. Syntax error
✅ Correct Answer: C
Explanation:
An infinite loop is a loop that continues forever because its condition never becomes false. It can cause programs to freeze or crash. Infinite loops usually occur due to logical errors and must be fixed to ensure proper execution.
7. What is conditional statement?
A. Loop
B. Output command
C. Statement that executes based on condition
D. Variable
✅ Correct Answer: C
Explanation:
A conditional statement executes code only when a specified condition is true. Examples include if and if-else statements. Conditional statements allow programs to make decisions and respond differently based on user input or data.
8. What is if-else statement?
A. Loop structure
B. Selection structure with two choices
C. Error handling
D. Output command
✅ Correct Answer: B
Explanation:
An if-else statement checks a condition and executes one block of code if the condition is true and another block if it is false. It allows programs to handle two possible outcomes effectively.
9. What is nested loop?
A. Loop inside another loop
B. Loop with error
C. Single loop
D. Conditional loop
✅ Correct Answer: A
Explanation:
A nested loop is a loop placed inside another loop. It is commonly used for tasks involving multi-dimensional data, such as matrices. Nested loops increase program complexity but are powerful when used correctly.
10. What is break statement?
A. Starts loop
B. Continues loop
C. Terminates loop or switch
D. Skips statement
✅ Correct Answer: C
Explanation:
The break statement is used to exit a loop or switch statement immediately. It helps control program flow by stopping execution when a certain condition is met. Using break carefully improves readability and logic.
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