Python for loop (MCQs)

What is the output of the following code snippet in Python? Python Quiz #3

for i in range(10):
    if i % 2 == 0:
        print(i)

A) 0 1 2 3 4 5 6 7 8 9 B) 0 2 4 6 8 C) 2 4 6 8 D) IndentationError: expected an indented block

Watch the video for answer: https://bit.ly/3WKH9wE

What is the correct syntax for a for loop in Python?

A) for (int i = 0; i < 10; i++):
B) for i in range(10):
C) for i = 0 to 9:
D) for i in 10:

watch the video for the answer: https://youtu.be/2mhrDgBEp10

What will be the output of the following code? Python Quiz #36

for i in range(5):
  print(i * 2)

- A) 0 1 2 3 4
- B) 2 4 6 8 10
- C) 10 8 6 4 2
- D) 0 2 4 6 8

Watch this video for the answer: https://bit.ly/3WqjjEP

How many times is the print statement executed? Python Quiz #37
```
for i in range(3):
 for j in range(2):
     print(f"i = {i}, j = {j}")
```
- A) 3 times
- B) 5 times
- C) 6 times
- D) 9 times

Watch this video for the answer: https://youtu.be/CYeZI3uCiTI

What will the program output if the number variable is set to 5? ```python
Get user input

number = int(input(“Enter non-negative number:”))

if number < 0: print(“Factorial is not defined for negative numbers.”) result = None elif number == 0 or number ==1: result = 1 else: result = 1 for i in range(2, number + 1): result *= i

if result is not None: print(“Factorial of”, number, “is”, result)

- A) Factorial is not defined for negative numbers.
- B) Factorial of 5 is 5
- C) Factorial of 5 is 120
- D) Factorial of 5 is 24

**Watch this video for the answer:** [https://youtu.be/K5LV5I2hFg4](https://youtu.be/K5LV5I2hFg4)

6. **What will happen if the `number` variable is set to `0`?**

```python
# Get user input
number = int(input("Enter non-negative number:"))

if number < 0:
    print("Factorial is not defined for negative numbers.")
    result = None
elif number == 0 or number ==1:
    result = 1
else:
    result = 1
    for i in range(2, number + 1):
        result *= i

if result is not None:
    print("Factorial of", number, "is", result)

A) The program will raise an error.
B) The program will print “Factorial of 0 is 1”.
C) The program will print “Factorial is not defined for negative numbers.”
D) The program will print “Factorial of 0 is 0”.

Watch this video for the answer: https://youtu.be/K5LV5I2hFg4

What is the primary purpose of a for loop in Python?

- A) To define a function
- B) To iterate over a sequence
- C) To create a conditional statement
- D) To perform mathematical operations

In Python, what does the range() function do when used in a for loop? - A) Generates a sequence of numbers - B) Defines a list - C) Calculates the average - D) Determines the length of a string

How can you create a nested loop in Python?

- A) by using a loop inside another loop with proper indentation
- B) by using a loop inside another loop with parentheses
- C) by using a nested keyword before the inner loop
- D) by using a colon after the outer loop and before the inner loop

Answer: A

Question 4

Consider the following code:

total = 0
for i in range(1, 6):
    total += i
print(total)

What does this code accomplish?

A) It prints numbers from 1 to 5. B) It calculates the sum of numbers from 1 to 5. C) It prints the sum of numbers from 1 to 6. D) It calculates the sum of numbers from 0 to 5.

Explanation: The loop iterates over the range from 0 to 5 (inclusive), summing up the values. The total variable accumulates this sum.

Question 6

How can a for loop be used in a real-life scenario involving data processing?

A) To count the number of words in a large document. B) To open a web browser. C) To create a new file on the desktop. D) To turn off a computer.

Explanation: A for loop can be used to iterate through the words in a document to count them, making it useful for data analysis tasks.

Answer: A

Why might you use a for loop instead of manually performing repeated tasks?

- A) To reduce the chance of human error.
- B) To make the program run slower.
- C) To avoid using variables.
- D) To limit the program to one iteration.

Explanation: Using a for loop automates repetitive tasks, which helps prevent errors and saves time, especially when processing large datasets or performing repetitive calculations.

Answer: A

What does the following code print?

for x in range(5, 8):
    print(x)

- A) 5 6 7
- B) 5 6 7 8
- C) 4 5 6 7
- D) 5 6 7 8 9

Explanation: The range(5, 8) function generates numbers starting from 5 up to, but not including, 8.

Answer: A

What does the following code output?

for i in range(1, 4):
    for j in range(1, 3):
        print(i, j)

A) 1 1 1 2 2 1 2 2 3 1 3 2 B) 1 2 2 3 3 4 C) 1 3 2 3 3 3 D) 1 1 2 2 3 3

Explanation: This is a nested loop, where the outer loop runs from 1 to 3 (inclusive) and the inner loop runs from 1 to 2 (inclusive). It prints all combinations of i and j.

Answer: A

What will be the output of this code?

for i in range(3):
    print(i * i)

A) 0 1 4 B) 0 1 2 C) 1 4 9 D) 0 2 4

Explanation: The loop iterates over the range 0, 1, 2. For each iteration, it prints the square of the current index i.

Answer: A

What will the following code output?

for i in range(5, 10, 2):
    print(i)

A) 5 7 9

B) 5 6 7 8 9

C) 5 7 9 11

D) 5 7 8

Explanation: The range(5, 10, 2) generates numbers starting from 5 up to, but not including, 10 with a step of 2, resulting in 5, 7, and 9.

Answer: A