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Python · Recursion

15 questions · 32 marks · 6 papers

Answer key

Indian Institute of Technology Madras

BS Degree Programme · Examination & Study Paper

Programming in Python

Recursion

Official Paper

Examination Instructions & Guidelines

Solve on notebook/paper first before checking solutions.
MCQ: Exactly 1 option is correct. Negative marking applies.
MSQ: One or more options correct. Select all to score.
NAT: Numerical response. No negative marking.
Scientific calculator allowed for all calculations.
Official answer key is sealed at the end of this sheet.

End Term · 31 Aug 2025 (FN)End Term

Q1NAT3 Marks·Write the number
Key ↓
Consider the following Python code: def transform(words): if not words: return [] first = words[0][::-1] if first == first[::-1]: first = "<|>" return [first] + transform(words[1:]) sentence = "refer logic noon stats apple radar" words = sentence.split() new_sentence = " ".join(transform(words)) print(len(new_sentence)) What is the output of the given code?
Your answer:

End Term · 31 Aug 2025 (AN)End Term

Q2NAT3 Marks·Write the number
Key ↓
Consider the below python code. def procedure(child_dict, i): if i not in child_dict.keys(): return 1 ans = 1 for j in child_dict[i]: ans += procedure(child_dict, j) return ans child_dict = dict() child_dict[0] = [1,2] child_dict[1] = [3,4,5] child_dict[2] = [6,7,8] print(procedure(child_dict,0)) What will be the output of the given code?
Your answer:

End Term · 13 Apr 2025 (FN)End Term

Q3MCQ3 Marks·Choose one option
Key ↓
1. AIt reverses the entire sub-list from left to right, regardless of whether the elements are odd or even.
2. BIt reverses only the odd elements in the range [left, right], leaving even elements in their original positions.
3. CIt moves all even elements to the left and all odd elements to the right (a partition), but does not change the relative order of the odd elements themselves.
4. DIt sorts the sub-list from left to right in ascending order, ignoring whether elements are odd or even.
Q4NAT4 Marks·Write the number
Asked 2 times Key ↓
Your answer:

End Term · 13 Apr 2025 (AN)End Term

Q5NAT4 Marks·Write the number
Asked 2 times Key ↓
Your answer:
Read the passage below, then answer Q6–Q8
Based on the below code answer the given subquestions.
Q6NAT1 Mark·Write the number
Key ↓
Your answer:
Q7NAT1.5 Marks·Write the number
Key ↓
Your answer:
Q8NAT1.5 Marks·Write the number
Key ↓
What will be the value passed to the function in the call before the base case, if the function is called with the input 32456 ?
Your answer:

End Term · 22 Dec 2024 (FN)End Term

Q9MCQ3 Marks·Choose one option
Key ↓
1. A
2. B
3. C
4. D
Read the passage below, then answer Q10–Q12
Q10MCQ1.5 Marks·Choose one option
Asked 9 times Key ↓
1. A
2. B
3. C
4. D
Q11MSQ1.5 Marks·Choose all correct options
Asked 9 times Key ↓
1. A
2. B
3. C
4. D
Q12MCQ1 Mark·Choose one option
Asked 9 times Key ↓
1. A
2. B
3. C
4. D

End Term · 22 Dec 2024 (AN)End Term

Read the passage below, then answer Q13–Q15
Q13MCQ1.5 Marks·Choose one option
Asked 9 times Key ↓
1. A
2. B
3. C
4. D
Q14MSQ1.5 Marks·Choose all correct options
Asked 9 times Key ↓
1. A
2. B
3. C
4. D
Q15MSQ1 Mark·Choose all correct options
Asked 9 times Key ↓
1. A
2. B
3. C
4. D

Official Key

Master Answer Key & Explanations

Official answer keys from IIT Madras BS past papers. Click any question to review.

Reveal Key

Q127

Q29

Q3B

Q439

Q54

Q610

Q75

Q83

Q9A

Q10B

Q11A, B

Q12A

Q13C

Q14A, B

Q15A, C

Questions and answer keys are reproduced from the official IIT Madras BS papers. Topics and repeated question types are BTechi’s own grouping. BTechi is not affiliated with IIT Madras.