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C Programming · All 2025 papers

65 questions · 250 marks · 3 papers

Answer key

Indian Institute of Technology Madras

BS Degree Programme · Examination & Study Paper

Programming in C

All 2025 papers

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.

Quiz 1 · 26 Oct 2025 (AN)Quiz 1

Q1MCQ2 Marks·Choose one option
Key ↓
Which of the following correctly ranks the memory units from fastest to slowest access time?
1. ACache → Registers → RAM → Hard Disk → Optical Disk
2. BRegisters → Cache → RAM → SSD → Hard Disk
3. CRAM → Registers → Cache → SSD → Hard Disk
4. DRegisters → RAM → Cache → HDD → SSD
Q2MCQ2 Marks·Choose one option
Key ↓
In an N-bit signed integer representation using 2’s complement, what is the range of values?
1. A
2. B
3. C
4. D
Q3MCQ2 Marks·Choose one option
Key ↓
Which of the following statements about Boolean conditions in C is true?
1. AIn C, 0 represents true, and any non-zero value represents false.
2. BIn C, 0 represents false, and any non-zero value represents true.
3. CC treats only positive integers as true.
4. DIn C, positive integers represent true, and negative integers represent false.
Q4MCQ3 Marks·Choose one option
Key ↓
The decimal number 2748 is represented in hexadecimal as:
1. A0xABC
2. B0xABD
3. C0xABE
4. D0xABF
Q5MCQ3 Marks·Choose one option
Key ↓
What is the minimum number of bits required to represent all integer values from −120 to +120 in a signed binary representation?
1. A5 Bits
2. B6 bits
3. C7 bits
4. D8 bits
5. E9 bits
Q6MCQ3 Marks·Choose one option
Asked 2 times Key ↓
1. Aa = 13, b = -4, c = 12
2. Ba = 12, b = -3, c = 11
3. Ca = 14, b = -5, c = 13
4. Da = 11, b = -2, c = 10
Q7MCQ3 Marks·Choose one option
Key ↓
1. A100
2. B200
3. C300
4. D400
Q8MCQ3 Marks·Choose one option
Key ↓
1. A6 5 4
2. B6 4 5
3. C6 3 5
4. D6 5 3
Q9MCQ4 Marks·Choose one option
Key ↓
1. ASum of first N natural numbers
2. BSum of squares of first N natural numbers
3. CSum of cubes of first N natural numbers
4. DFactorial of N
Q10MCQ4 Marks·Choose one option
Asked 3 times Key ↓
1. A0 1 2 5 6
2. B0 1 5 6
3. C1 2 3 6
4. D1 2 3 5 6
Q11MSQ2 Marks·Choose all correct options
Key ↓
Which of the following are key functions of the Arithmetic Logic Unit (ALU)?
1. AAddition and subtraction
2. BLogical comparisons (>, <, =)
3. CMemory storage management
4. DMultiplication and division
5. EInstruction decoding
Q12MSQ2 Marks·Choose all correct options
Asked 2 times Key ↓
Which statement is true about short-circuit evaluation in C?
1. AIn expr1 && expr2, if expr1 is false, expr2 is not evaluated.
2. BIn expr1 || expr2, if expr1 is true, expr2 is not evaluated.
3. CIn expr1 && expr2, if expr1 is true, expr2 is not evaluated.
4. DIn expr1 || expr2, if expr1 is false, expr2 is not evaluated.
Q13MSQ3 Marks·Choose all correct options
Key ↓
1. A
2. B
3. C
4. D
5. E
Q14MSQ3 Marks·Choose all correct options
Key ↓
1. Aa = 6, b = 4
2. Ba = 3, b = 5
3. Ca = 2, b = -3
4. Da = 4, b = 6
Q15NAT3 Marks·Write the number
Key ↓
Your answer:
Q16NAT4 Marks·Write the number
Key ↓
Your answer:
Q17NAT4 Marks·Write the number
Asked 3 times Key ↓
Your answer:

End Term · 31 Aug 2025 (FN)End Term

Q18MCQ4 Marks·Choose one option
Asked 2 times Key ↓
1. APre-increment changes the value after the expression is evaluated, while post- increment changes it before the expression is evaluated.
2. BPre-increment changes the value before the expression is evaluated, while post-increment changes it after the expression is evaluated.
3. CPre-increment is used with integers, while post-increment is used with floating-point numbers.
4. DPre- and Post-increment are identical in operation. They are two ways of writing the same statement.
Q19MCQ4 Marks·Choose one option
Key ↓
1. A
2. B
3. C
4. D
Q20MCQ4 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.
Q21MCQ4 Marks·Choose one option
Asked 2 times Key ↓
1. A
2. B
3. C
4. D
Q22MCQ4 Marks·Choose one option
Asked 2 times Key ↓
1. A
2. B
3. C
4. D
Q23MCQ4 Marks·Choose one option
Asked 2 times Key ↓
1. A
2. B
3. C
4. D
Q24MCQ4 Marks·Choose one option
Asked 2 times Key ↓
1. A
2. B
3. C
4. D
Q25MCQ4 Marks·Choose one option
Asked 2 times Key ↓
1. A10
2. B20
3. C30
4. D40
Q26MCQ4 Marks·Choose one option
Key ↓
1. A
2. B
3. C
4. D
Q27MCQ4 Marks·Choose one option
Asked 2 times Key ↓
1. A
2. B
3. C
4. D
Q28MCQ4 Marks·Choose one option
Asked 2 times Key ↓
A special data type is declared where multiple members share the same memory location. The size of an instance of this type is equal to the size of its largest member. What kind of data type is this?
1. A
2. B
3. C
4. D
Q29MCQ4 Marks·Choose one option
Asked 2 times Key ↓
1. A
2. B
3. C
4. D
Q30MCQ4 Marks·Choose one option
Asked 2 times Key ↓
In C programming, which memory region is primarily used for storing local variables of functions and function call information?
1. AHeap memory
2. BStack memory
3. CStatic memory
4. DCode segment
Q31MCQ4 Marks·Choose one option
Asked 2 times Key ↓
1. A"New Content" is appended to the end, resulting in "Hello WorldNew Content".
2. BThe file is cleared, and only "New Content" is written.
3. CThe code will fail to open the file because it already exists.
4. D"New Content" is inserted at the beginning, pushing "Hello World" to the end.
Q32MCQ4 Marks·Choose one option
Asked 2 times Key ↓
1. A
2. B
3. C
4. D
Q33MCQ4 Marks·Choose one option
Asked 2 times Key ↓
What is the primary purpose of the C preprocessor?
1. ATo execute the program's logic before the main function.
2. BTo convert the source code into machine language.
3. CTo process directives and modify the source code before compilation.
4. DTo manage dynamic memory allocation during runtime.
Q34MCQ4 Marks·Choose one option
Asked 2 times Key ↓
1. A25
2. B23
3. C17
4. D15
Q35MCQ4 Marks·Choose one option
Asked 2 times Key ↓
1. A7
2. B104
3. C4
4. D5
Q36MCQ5 Marks·Choose one option
Key ↓
1. A2 4 6 8
2. B2 4 6 8 10
3. CInfinite loop
4. D2 4 6 8 10 12
Q37MCQ5 Marks·Choose one option
Asked 2 times Key ↓
1. A0501
2. B150
3. C501
4. D1050
Q38NAT5 Marks·Write the number
Asked 2 times Key ↓
Your answer:
Q39NAT5 Marks·Write the number
Asked 2 times Key ↓
Your answer:
Q40NAT4 Marks·Write the number
Asked 2 times Key ↓
Your answer:
Q41NAT4 Marks·Write the number
Asked 2 times Key ↓
Your answer:

End Term · 31 Aug 2025 (AN)End Term

Q42MCQ4 Marks·Choose one option
Asked 2 times Key ↓
1. A
2. B
3. C
4. D
Q43MCQ4 Marks·Choose one option
Key ↓
1. ATo exit the loop entirely and continue with the program statement immediately following the loop.
2. BTo restart the loop from the beginning.
3. CTo immediately proceed to the next iteration of the loop, skipping any remaining statements in the current iteration.
4. DTo execute a block of code only a fixed number of times.
Q44MCQ4 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.
Q45MCQ4 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.
Q46MCQ4 Marks·Choose one option
Asked 2 times Key ↓
1. A
2. B
3. C
4. D
Q47MCQ4 Marks·Choose one option
Asked 2 times Key ↓
1. A10 10
2. B5 10
3. C5 5
4. D10 5
Q48MCQ4 Marks·Choose one option
Asked 2 times Key ↓
1. A
2. B
3. C
4. D
Q49MCQ4 Marks·Choose one option
Asked 2 times Key ↓
1. A1
2. B2
3. C3
4. D4
Q50MCQ4 Marks·Choose one option
Key ↓
1. A11 bytes.
2. B12 bytes.
3. C13 bytes.
4. D14 bytes.
Q51MCQ4 Marks·Choose one option
Asked 2 times Key ↓
1. A{0, 0, 100, 0, 0, 0}
2. B{100, 100, 100, 100, 100, 100}
3. C{100, 0, 0, 0, 0, 0}
4. D{0, 100, 0, 0, 0, 0}
Q52MCQ4 Marks·Choose one option
Asked 2 times Key ↓
1. A
2. B
3. C
4. D
Q53MCQ4 Marks·Choose one option
Asked 2 times Key ↓
1. A
2. B
3. C
4. D
Q54MCQ4 Marks·Choose one option
Asked 2 times Key ↓
1. ARED = 0, GREEN = 3, BLUE = 1
2. BRED = 1, GREEN = 3, BLUE = 4
3. CRED = 0, GREEN = 3, BLUE = 4
4. DRED = 1, GREEN = 3, BLUE = 2
Q55MCQ4 Marks·Choose one option
Asked 2 times Key ↓
In C programming, which memory region is typically used for dynamic memory allocation?
1. AHeap memory
2. BStack memory
3. CStatic memory
4. DCode segment
Q56MCQ4 Marks·Choose one option
Asked 2 times Key ↓
1. A
2. B
3. C
4. D
Q57MCQ4 Marks·Choose one option
Asked 2 times Key ↓
1. A
2. B
3. C
4. D
Q58MCQ4 Marks·Choose one option
Asked 2 times Key ↓
When a macro is used in a C program, at what stage is its definition replaced into the code?
1. A
2. B
3. C
4. D
Q59MCQ4 Marks·Choose one option
Asked 2 times Key ↓
Consider the below C program: What will be the output of the given C program?
1. A16
2. B10
3. C7
4. D12
Q60MCQ5 Marks·Choose one option
Asked 2 times Key ↓
1. A(0,0), (0,2), (1,1), (1,3), (2,2), (2,3)
2. B(0,0), (0,2), (0,3), (1,1), (2,2)
3. C(0,0), (0,2), (1,1), (1,3), (2,2)
4. D(0,1), (0,3), (1,1), (1,3), (2,2), (2,3)
Q61MCQ5 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
Q62NAT4 Marks·Write the number
Asked 2 times Key ↓
Your answer:
Q63NAT4 Marks·Write the number
Asked 2 times Key ↓
Your answer:
Q64NAT5 Marks·Write the number
Asked 3 times Key ↓
Consider the following C code: What will be the output of the given program?
Your answer:
Q65NAT5 Marks·Write the number
Asked 2 times Key ↓
Your answer:

Official Key

Master Answer Key & Explanations

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

Reveal Key

Q1B

Q2A

Q3B

Q4A

Q5D

Q6A

Q7D

Q8D

Q9B

Q10C

Q11A, B, D

Q12A, B

Q13B, C, E

Q14C, D

Q1513

Q165

Q1721

Q18B

Q19C

Q20B

Q21C

Q22B

Q23B

Q24B

Q25B

Q26A

Q27B

Q28B

Q29C

Q30B

Q31B

Q32B

Q33C

Q34D

Q35A

Q36A

Q37A

Q384

Q3920

Q4026

Q417

Q42C

Q43C

Q44C

Q45B

Q46A

Q47A

Q48A

Q49D

Q50B

Q51A

Q52C

Q53C

Q54C

Q55A

Q56B

Q57B

Q58C

Q59C

Q60C

Q61B

Q6219

Q632

Q649

Q6560

Questions and answer keys are reproduced from the official IIT Madras BS papers. BTechi is not affiliated with IIT Madras.