NPTEL The Joy of Computing using Python Week 6 Assignment Answers 2025
1. If n is a positive integer, what is the output of the function given input n,
- Sum of numbers from 1 to n
- Sum of numbers from 1 to n-1
- n-1
- n
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2. Assertion (A): If a recursive function doesn’t have a base case, it may never stop.
Reason (R): Recursion means that a function calls itself.
- Both (A) and (R) are true, and (R) is the correct explanation of (A).
- Both (A) and (R) are true, but (R) is not the correct explanation of (A).
- (A) is true, but (R) is false.
- (A) is false, but (R) is true.
Answer :-
3. What is the output of following code ?
- Error
- 25
- 26
- 5
Answer :-
4. In English, the letter ‘z’ usually appears far less often than most letters. Now imagine applying a Substitution Cipher to a large body of English text, where ‘z’ is replaced by ‘r’, and every other letter is also mapped to a unique letter. After encryption, which letter is likely to be the least frequent in the new text?
Hint: Search the internet for more info, if needed.
- z
- r
- e
- It is not possible to determine
Answer :-
5. If you have a large ciphertext produced by a simple substitution cipher on an English text, can you determine the original message by examining how often each letter appears?
Hint: Search the internet for more info, if needed.
- Yes, it can be done.
- No, it cannot be done.
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6. Suppose you suspect that a piece of ciphertext was produced using a simple sub-stitution cipher. Under which circumstances might frequency analysis fail to yield accurate results?
- The ciphertext is short.
- The ciphertext was encrypted with another method before encrypting with sub-stitution cipher.
- The ciphertext is very long.
Answer :-
7. If variable dict_name is a non-empty dictionary, what does dict name.values() re-turn?
- Returns nothing, but prints all the keys in the dictionary.
- Returns a list of all the keys in the dictionary.
- Returns a list of all the values in the dictionary.
- Returns a list of all the items in the dictionary.
Answer :-
8. Assertion (A): A Caesar Cipher is a type of Substitution Cipher.
Reason (R): In a Caesar Cipher, each letter in the plaintext is replaced by a letter at a fixed shift in the alphabet.
- Both (A) and (R) are true, and (R) is the correct explanation of (A).
- Both (A) and (R) are true, but (R) is not the correct explanation of (A).
- (A) is true, but (R) is false.
- (A) is false, but (R) is true.
Answer :-
9. Which outcome generally follows from providing a proper base case in a recursive function?
- The function returns a predefined result when the base condition is met.
- It prevents infinite recursion and stops when a specific codition is met.
- It ensures recursion depth is always constant.
- It allows the function to keep calling itself indefinitely.
Answer :-
10. In a standard 3×3 Tic-Tac-Toe board, how many distinct winning lines (rows, columns, or diagonals) pass through the center square?
- 3
- 2
- 5
- 4
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