Computer Science
Multiple Choice
Questions
(MCQs) – Sets 44
with Detailed Explanations
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SET 44 – Computer Science MCQs
✅ No repetition from Sets 1–43
✅ 10 completely new questions
✅ Each explanation
Level: Class 9–10 / Beginners
1. What is a variable?
A. Fixed value
B. Programming error
C. Memory location to store data
D. Output device
✅ Correct Answer: C
Explanation:
A variable is a named memory location used to store data that can change during program execution. Variables allow programs to work with different values dynamically. They make programs flexible and reusable by storing user input, calculations, and results efficiently.
2. What is a constant?
A. Variable value
B. Memory error
C. Fixed value that cannot change
D. Output unit
✅ Correct Answer: C
Explanation:
A constant is a value in a program that remains unchanged throughout execution. It helps maintain consistency and prevents accidental modification of important values. Constants improve program readability and reliability by clearly identifying fixed data.
3. What is data type?
A. Error type
B. Variable name
C. Type of data a variable can store
D. Output format
✅ Correct Answer: C
Explanation:
A data type defines the kind of data a variable can hold, such as integers, characters, or decimals. Data types help the computer allocate memory properly and perform correct operations. Using correct data types prevents errors and improves efficiency.
4. What is an operator?
A. Data type
B. Variable
C. Symbol used to perform operations
D. Output command
✅ Correct Answer: C
Explanation:
An operator is a symbol that performs operations on data. Examples include arithmetic operators (+, −), relational operators (>, <), and logical operators (AND, OR). Operators allow programs to perform calculations and make decisions.
5. What is expression?
A. Statement
B. Variable
C. Combination of variables, constants, and operators
D. Program error
✅ Correct Answer: C
Explanation:
An expression is a combination of variables, constants, and operators that produces a result. Expressions are used in calculations and decision-making. They are an essential part of programming logic and control program behavior.
6. What is statement?
A. Program comment
B. Error message
C. Instruction that performs an action
D. Variable name
✅ Correct Answer: C
Explanation:
A statement is a single instruction in a program that performs an action, such as assigning a value or printing output. Programs consist of multiple statements executed in sequence. Statements control the flow and behavior of programs.
7. What is assignment operator?
A. Arithmetic operator
B. Comparison operator
C. Operator used to assign value to variable
D. Logical operator
✅ Correct Answer: C
Explanation:
The assignment operator assigns a value to a variable. It stores the result of an expression in memory. Proper use of assignment operators ensures correct data storage and program functionality.
8. What is relational operator?
A. Adds values
B. Logical decision
C. Compares two values
D. Assigns value
✅ Correct Answer: C
Explanation:
Relational operators compare two values and return a true or false result. Examples include greater than, less than, and equal to. They are commonly used in conditions and decision-making statements.
9. What is logical operator?
A. Performs arithmetic
B. Assigns value
C. Combines conditions
D. Displays output
✅ Correct Answer: C
Explanation:
Logical operators combine multiple conditions and return true or false. Common logical operators include AND, OR, and NOT. They are used in decision-making and loops to control program flow based on multiple conditions.
10. What is precedence of operators?
A. Order of program execution
B. Variable priority
C. Order in which operators are evaluated
D. Program speed
✅ Correct Answer: C
Explanation:
Operator precedence determines the order in which operators are evaluated in an expression. It ensures correct calculation results. For example, multiplication is performed before addition. Understanding precedence helps avoid logical errors in programs.
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