The Joy of Computing using Python Week 4 NPTEL Assignment Answers 2025

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✅ Subject: The Joy of Computing using Python
📅 Week: 4
🎯 Session: NPTEL 2025 July-October
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NPTEL The Joy of Computing using Python Week 4 Assignment Answers 2025

1. What is the output type of the function jumble_word(“Moana”)?

• List
• Tuple
• Dictionary
• String

Answer : See Answers

2. Why do we use list(word) before shuffling in jumble_word?

• Strings are immutable, so we convert to list
• Strings can be shuffled directly
• It converts all characters to uppercase
• It reverses the word

Answer :

3. Consider the line: if guess.lower() == original.lower():

What will happen if we remove .lower() from both sides?

• It will make the comparison more accurate
• The game will stop working entirely
• It may incorrectly mark right answers as wrong if case differs
• The original variable will change

Answer :

4. Which function is used to randomize the order of items in a list in the given code?

• random.choice()
• random.shuffle()
• random.sort()
• random.sample()

Answer :

5. What issue can occur with this line: jumbled = jumble_word(original)?

• It may return the original word in the same order
• It will always return the original word
• It causes a syntax error
• It deletes a letter from the word

Answer :

6. Which modification ensures that the jumbled word is not the same as the original?

• Add .lower() after shuffle()
• Convert it to uppercase
• Use reverse() instead of shuffle()
• Add a loop to reshuffle until different

Answer :

7. Suppose the word is “Yoda”. Which of the following is the least desirable output of jumble_word(“Yoda”), if the goal is to challenge the user?

• “odYa”
• “Yoda”
• “dayo”
• “odaY”

Answer : See Answers

8. What is the purpose of random.choice(characters)?

• To select a character randomly from the list
• To jumble all characters
• To sort the characters alphabetically
• To pick all characters one by one

Answer :

9. What will happen if the characters list is empty?

• The program will crash with IndexError
• The program will continue running without error
• The program will print a blank string
• The program will crash with ValueError

Answer :

10. Which of the following is the best way to score the user if you want to turn this into a 5-round game?

• Add 5 to score after every round
• Create a list of 5 questions and loop with a score variable
• Print the score inside the jumble_word function
• Use break instead of score

Answer :

In Python, a matrix is not a special built-in type. It is usually represented as a list of lists, where each inner list represents a row of the matrix.

For example, if we want to create a 3×3 matrix filled with zeros, we can do it like this:

This code will output:

[0, 0, 0]
[0, 0, 0]
[0, 0, 0]

Each sublist represents a row, and each element inside the sublist is a column element. Python gives you full flexibility, rows can even be of different lengths

11. What will be the output of the following code?

• [[99, 0, 0], [99, 0, 0], [99, 0, 0]]
• [[99, 0, 0], [0, 0, 0], [0, 0, 0]]
• [[99, 0, 0], [99, 0, 0], [0, 0, 0]]
• [[0, 0, 0], [0, 0, 0], [0, 0, 0]]

Answer :

12. What does line matrix.append([0] * 3)do inside a loop?

• Adds the same list multiple times
• Creates a new list each time and appends it
• Appends 0 three times
• Adds a tuple to the matrix

Answer :

13. What is the result of this code?

• 1
• 2
• 3
• 4

Answer : See Answers

14. Which of the following correctly creates a 2×2 matrix of zeros?

• [[0, 0], [0, 0]]
• [0, 0, 0, 0]
• [[0]2]2
• Both a and c

Answer :

15. Which of these statements access the last element of the first row , in the matrix [[0, 0, 0] [0, 0, 0] [0, 0, 0]]

• matrix[0][0]
• matrix[1][2]
• matrix[0][2]
• matrix[2][0]

Answer :

16. What does the following code do?

• Creates a 2×3 matrix with each row filled with i
• Adds only one row
• Creates a 2×3 matrix with values increasing across rows
• Creates a 3×2 matrix

Answer :

17. Which Python structure is best to represent a 3×3 grid of numbers?

• List of strings
• List of tuples
• List of lists
• Dictionary

Answer :

18. What does this code do?

• Creates a 1×3 matrix
• Creates a 3×3 matrix with all values as 1
• Gives an error
• Creates a 3×1 matrix

Answer :

19. Which of the following will raise an IndexError for a 2×2 matrix?

• matrix[1][1]
• matrix[2][0]
• matrix[0][1]
• matrix[1][0]

Answer :

20. What will be the output of the following code?

• [[1, 4], [2, 5], [3, 6]]
• [[1, 2, 3], [4, 5, 6]]
• [[1, 4, 2, 5, 3, 6]]
• [[1, 2], [4, 5], [3, 6]]

Answer : See Answers

Maya, a beginner Python programmer, has recently learned how to create lists using loops. Her mentor introduces her to list comprehension , a powerful and compact way to build lists using a single line of code.

Maya is especially interested in 2D lists (matrices) and wants to:
Create a matrix of zeroes
Generate addition tables
Fill custom values using formulae
Perform transposition
Apply filtering (like collecting even numbers)
Her mentor shows her the following code snippet:

21. What is the value of zeros[1][2]?

• 1
• 0
• 2
• Error

Answer :

22. What is the length of the list evens?

• 5
• 10
• 0
• 9

Answer :

23. What is the type of add_table?

• Integer
• List
• String
• Dictionary

Answer :

24. What does matrix[1] evaluate to?

• [10, 11, 12]
• [0, 1, 2]
• [1, 2, 3]
• [11, 12, 13]

Answer :

25. What is the shape (rows × cols) of the transpose list?

• 2 × 3
• 3 × 2
• 2 × 2
• 3 × 3

Answer :

26. What is the value of add_table[2][2]?

• 2
• 4
• 5
• 6

Answer :

27. What is the value of transpose[0][1]?

• 10
• 0
• 1
• 11

Answer :

28. What is the last element of the list evens?

• 10
• 8
• 9
• 6

Answer :

29. Which formula was used to generate the values in the matrix list?

• r + c
• r * c
• r * 10 + c
• r + c * 10

Answer :

30. What is the sum of all values in transpose[1]?

• 11
• 12
• 13
• 114

Answer : See Answers

NPTEL The Joy of Computing using Python Week 4 Assignment Answers 2024

1. Select the correct statements regarding Magic Square:

• Magic Square of Order 1 is Trivial
• Sum of 2 magic squares is a magic square
• Magic Square of Order 2 is not possible
• The magic constant (the sum of row/columns/diagonal elements) for a 7×7 possible magic square is 260

Answer: a, b, c, d
Explanation:

• Order 1 is a trivial case with a single element.
• The sum of two magic squares (element-wise) results in another magic square.
• There’s no magic square possible of order 2.
• For a 7×7 magic square, magic constant = (7 * (49 + 1))/2 = 7 × 25 = 175 (Hence this option is incorrect, correct answer is a, b, c).

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2. For which of the matrices would the following code snippet return True?

• 834 159 672
• 276 951 438
• 672159834
• 294753618

Answer: a, b, c, d
Explanation:
Each listed matrix appears to satisfy the conditions for a magic square or logic used in the code. Likely, the code checks for row/column/diagonal equality.

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3. Suppose you want to simulate the Birthday Paradox by generating random birthdays for a group of people. Which library function would you most likely use to create random integers representing birthdays?

• random.randint()
• time.time()
• random.random()
• None of the above

Answer: a
Explanation:
random.randint() is used to generate random integers in a specified range, ideal for simulating days of the year.

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4. Which of the following are functions in the date-time module of Python?

• datetime.now()
• datetime.present()
• date.today()
• date.now()

Answer: a, c
Explanation:
datetime.now() and date.today() are valid and commonly used functions from the datetime module. Others are invalid.

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6. To implement a magic square, we use the concept of matrices. Select all the statements that are True in this context.

• One possible Implementation of matrices is through nested lists in Python.
• NumPy is one of the standard libraries associated with implementing matrices.
• Implementation of matrices is only through lists in Python.
• None of the above

Answer: a, b
Explanation:
Python allows matrix representation via nested lists and libraries like NumPy. Option c is false as matrices can also be implemented using libraries.

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7. Consider the given dataset of 60 people born in 2000. Run your code using the given data to check the count of people whose birthdays fall exactly on a Tuesday.

• 8
• 9
• 10
• 11

Answer: c
Explanation:
Based on simulation/code logic, 10 is the correct output for Tuesday birthdays.

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8. What is the output of the following snippet of code?
Hint:
If L = [1, 2, 3, 4, 5], then L[1: 3] is the list [2, 3]. Slicing a list is very similar to slicing a string. All the rules that you have learned about string-slicing apply to list-slicing.
If P = [1, 2, 3] and Q = [4, 5, 6] then P + Q is the list [1, 2, 3, 4, 5, 6]. Again, list concatenation is very similar to string concatenation.

• [90, 47, 8, 18, 10, 7]
• [7, 10, 18, 8, 47, 90]
• [7, 8, 10, 18, 47, 90]
• [90, 47, 18, 10, 8, 7]

Answer: c
Explanation:
This represents a sorted version of the list in ascending order.

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9. What does the random.choice() function do?

• Generates a random integer.
• Selects a random element from a sequence.
• Chooses a random floating-point number.
• Generates a random Boolean value.

Answer: b
Explanation:
random.choice() selects a random item from a non-empty sequence.

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10. Identify the magic squares from the following:

Answer: a, b, c, d
Explanation:
All listed options meet the criteria of a magic square where the sums of rows, columns, and diagonals are the same.