Important Questions and Answers for Class 11 Computer Science Chapter 6 Flow of Control 2025-26

Q1. In Python, which statement is used to execute a group of statements repeatedly as long as a condition is true?

• (a) if statement
• (b) else statement
• (c) while statement
• (d) break statement

Answer: (c) while statement

Q2. What is the output of the following code?

for letter in 'PYTHON':
    print(letter)

• (a) P Y T H O N (on one line)
• (b) Each letter on a separate line
• (c) Error
• (d) Only P is printed

Answer: (b) Each letter on a separate line

Q3. Which statement is used to skip the current iteration in a loop and move to the next one in Python?

• (a) skip
• (b) continue
• (c) break
• (d) stop

Answer: (b) continue

Q4. What will be the value of diff for input values num1=3, num2=6 in the following code?

if num1 > num2:
    diff = num1 - num2
else:
    diff = num2 - num1

• (a) -3
• (b) 9
• (c) 3
• (d) 0

Answer: (c) 3

2. Very Short Answer (VSA).

Q1. What is flow of control in Python programming?

Answer: Flow of control in Python refers to the order in which statements are executed in a program, managed using control structures like selection and repetition.

Q2. Name any two types of control structures in Python.

Answer: The two main types of control structures in Python are selection (if, if-else, elif) and repetition (for, while loops).

Q3. Mention the purpose of indentation in Python.

Answer: Indentation in Python is used to define blocks of code and establish the hierarchy of statements, making structure and nesting clear.

Q4. What does the break statement do in a loop?

Answer: The break statement terminates the current loop immediately, transferring control to the statement following the loop.

Q5. Define an infinite loop.

Answer: An infinite loop is a loop whose condition never becomes false, causing it to run endlessly until externally stopped.

3. Short Answer Questions.

Q1. Differentiate between the 'break' and 'continue' statements in a loop with an example for each.

Answer: 'break' ends the entire loop immediately, while 'continue' skips the rest of the current loop iteration and moves to the next. For example, using 'break' inside a for loop exits on a certain condition; 'continue' will skip printing a value but continue looping.

Q2. What is the use of the range() function in Python's for loop?

Answer: The range() function generates a sequence of numbers, which is commonly used in for loops for iteration a specific number of times. For example, range(5) generates numbers from 0 to 4 for loop execution.

Q3. How does Python determine blocks of code?

Answer: Python uses indentation to indicate blocks of code. Statements with the same indentation level belong to the same block, which is critical for control structures like if, for, and while.

Q4. Explain the use of nested loops with an example.

Answer: Nested loops are loops inside other loops, allowing iteration over multiple dimensions. For example, printing each element of a matrix uses a loop for rows, and within it, another loop for columns.

4. Long Answer Questions.

Q1. Explain with an example how if, elif, and else are used in Python to handle multiple decision paths.

Answer: In Python, multiple decision-making can be performed using if, elif, and else. The if statement checks the first condition. If it's false, the elif (else if) checks another. If all are false, the else block executes. This structure allows choosing one path out of many based on different conditions.

1. Start with if condition; execute its block if true.
2. If false, check elif conditions in order; execute when true.
3. If none are true, execute the else block.

Q2. Describe the working and syntax of the for loop using the range() function to print all even numbers between 1 and 20.

Answer: The for loop iterates over a sequence generated by the range() function. To print all even numbers from 1 to 20, use range(2, 21, 2), which starts from 2, ends before 21, and increments by 2. The loop executes the print statement for each value in this sequence.

1. Use for num in range(2, 21, 2):
2. Print num inside the loop to display each even number.

Q3. Discuss the importance of indentation in Python, especially in control flow constructs. What errors can occur if indentation is not followed properly? Write an example to support your answer.

Answer: Indentation in Python defines code blocks and is essential for proper program structure. Without correct indentation, the interpreter raises syntax errors. Misaligned or missing indentation can cause blocks to end prematurely or code to execute outside the intended control structure, affecting logic and yielding errors.

1. Consistent indentation groups statements in a block.
2. Misalignment causes IndentationError, halting code execution.
3. Example: forgetting to indent print inside if leads to error.

Q4. How does a 'while' loop work in Python to find the sum of digits of an integer? Explain with stepwise logic.

Answer: A while loop repeatedly extracts the last digit of a number using modulus, adds it to a sum, and then removes that digit by integer division. The process continues until the number becomes zero. This logic accumulates the total sum of digits efficiently.

1. Initialize sum = 0 and read the integer.
2. Repeat while number > 0.
3. Add last digit (number % 10) to sum; update number = number // 10.
4. Loop ends when number reaches 0.

4. True or False Questions.

Q1. The continue statement in a loop causes the program to exit the current loop completely.

Answer: False

Q2. Indentation in Python is optional and used only for better readability.

Answer: False

Q3. In Python, you can nest a for loop inside a while loop and vice versa.

Answer: True

Q4. The range() function always includes the stop value specified in its arguments.

Answer: False

5. Match the Following Questions.

Q1. Match the following.

Answer: 1 - A, 2 - B, 3 - C

Why Understanding Flow of Control in Python Matters for Class 11 Students?

• Learning Flow of Control in Python Class 11 concepts empowers you to write logical, efficient code. Practice strengthens your core programming skills for higher grades.
• Exploring Class 11 Computer Science Chapter 6 Flow of Control Important Questions ensures you are exam-ready.
• Each topic like selection statements, loops, and indentation is explained in easy steps so you can solve any related question in your exam confidently.
• You can review, download, or save this Class 11 Computer Science flow of control PDF for revision. Covering both basic and higher-order problems, these Flow of Control Class 11 Questions and Answers support you in learning Python for board exams and beyond.