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C Programming · Functions & recursion

6 questions · 26 marks · 2 papers

Answer key

Indian Institute of Technology Madras

BS Degree Programme · Examination & Study Paper

Programming in C

Functions & recursion

Official Paper

Examination Instructions & Guidelines

Solve on notebook/paper first before checking solutions.
MCQ: Exactly 1 option is correct. Negative marking applies.
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

Q1MCQ4 Marks·Choose one option
Asked 2 times Key ↓
When a recursive function is called, how does the call stack (or program stack) manage the function calls?
1. AEach new recursive call overwrites the previous function call on the stack.
2. BEach new recursive call adds a new stack frame to the top of the stack for its local variables and parameters.
3. CThe call stack is not used for recursive functions; a separate data structure is used.
4. DThe recursive calls are stored in a queue, waiting to be processed in order.
Q2MCQ4 Marks·Choose one option
Asked 2 times Key ↓
1. A
2. B
3. C
4. D
Q3MCQ5 Marks·Choose one option
Asked 2 times Key ↓
1. A0501
2. B150
3. C501
4. D1050

End Term · 31 Aug 2025 (AN)End Term

Q4MCQ4 Marks·Choose one option
Asked 2 times Key ↓
What is a potential risk of a recursive function that is not properly terminated with a base case?
1. AIt will cause a compile-time error.
2. BIt will always return an incorrect value.
3. CIt can lead to a stack overflow, as the function calls consume all available stack memory.
4. DThe program will terminate gracefully with a success message.
Q5MCQ4 Marks·Choose one option
Asked 2 times Key ↓
What is the fundamental conceptual difference between "pass-by-value" and "pass-by-reference" for function parameters in C?
1. APass-by-value is used for primitive types, while pass-by-reference is used for composite types.
2. BIn pass-by-value, a function works with a copy of the argument, whereas in pass-by-reference, it works with the original variable via its memory address.
3. CPass-by-value allows a function to modify the original variable, while pass-by- reference protects the original variable from modification.
4. DThe choice between pass-by-value and pass-by-reference is made automatically by the compiler based on the variable's type.
Q6MCQ5 Marks·Choose one option
Asked 2 times Key ↓
Consider the following C code: What is the output of the program?
1. A5
2. B101
3. C10
4. D111

Official Key

Master Answer Key & Explanations

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

Reveal Key

Q1B

Q2C

Q3A

Q4C

Q5B

Q6B

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