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OS · Quiz 1 · 26 Oct 2025 (Afternoon)

18 questions · 50 marks · 60 min

Answer key Take as mock

Indian Institute of Technology Madras

BS Degree Programme · Examination & Study Paper

Operating Systems

Quiz 1 · 26 Oct 2025 (Afternoon)

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.
Scientific calculator allowed for all calculations.
Official answer key is sealed at the end of this sheet.

Q1MCQ1 Mark·Choose one option
Key ↓
1. ATRUE
2. BFALSE
Q2MCQ2 Marks·Choose one option
Key ↓
In RISC-V, during system calls, which register stores the current mode of operation of the processor?
1. A
2. B
3. C
4. D
Q3MCQ2 Marks·Choose one option
Key ↓
1. ATRUE
2. BFALSE
Q4MCQ2 Marks·Choose one option
Key ↓
In the xv6 operating system, suppose a process is running and a timer interrupt occurs. What will be the transition for the process state?
1. ARunning → Sleeping
2. BRunning → Runnable
3. CRunning → Unused
4. DState remain unchanged
Q5MCQ2 Marks·Choose one option
Key ↓
In the xv6 operating system, when a process calls exit(), what will be the state transition of the process?
1. ARunning → Sleeping
2. BRunnable → Unused
3. CRunning → Zombie
4. DSleeping → Runnable
Q6MCQ2 Marks·Choose one option
Key ↓
Which of the following sequences of functions determines the steps for the execution of the first process initcode in the xv6 operating system?
1. A
2. B
3. C
4. D
Q7MCQ3 Marks·Choose one option
Key ↓
If the memory map for a device starts from the offset 0x20001000 and has a size of 2048 bytes in a 32-bit addressing scheme, what will be the last address in the memory map?
1. A0x200017FF
2. B0x20001800
3. C0x200016FF
4. D0x20000FFF
Q8MCQ3 Marks·Choose one option
Key ↓
1. A
2. B
3. C
4. D
Q9MCQ3 Marks·Choose one option
Key ↓
1. A
2. B
3. C
4. D
Q10MCQ3 Marks·Choose one option
Key ↓
1. A(i) → (ii) → (iii) → (iv)
2. B(i) → (iii) → (ii) → (iv)
3. C(ii) → (i) → (iii) → (iv)
4. D(iii) → (i) → (ii) → (iv)
Q11MCQ3 Marks·Choose one option
Key ↓
1. A
2. B
3. C
4. D
Q12MCQ3 Marks·Choose one option
Key ↓
1. AThe base address of the process stack.
2. BThe return value of the system call.
3. CThe number of arguments passed to the system call.
4. DThe number identifying the requested system call.
Q13MCQ3 Marks·Choose one option
Key ↓
1. A
2. B
3. C
4. D
Q14MCQ4 Marks·Choose one option
Key ↓
1. A2 KB
2. B4 KB
3. C8 KB
4. D16 KB
Q15MCQ4 Marks·Choose one option
Key ↓
Consider a system with 64 MB of physical memory and a 32-bit virtual address space. Given a page size of 16 KB, what will be the maximum number of page frames that can be present in RAM?
1. A2^(10) frames
2. B2^(11) frames
3. C2^(13) frames
4. D2^(12) frames
Q16MCQ4 Marks·Choose one option
Key ↓
1. A
2. B
3. C
4. D
Q17MSQ3 Marks·Choose all correct options
Key ↓
1. A
2. B
3. C
4. D
5. E
Q18MSQ3 Marks·Choose all correct options
Key ↓
1. AProcess Q1 is in the RUNNABLE state.
2. BProcess Q2 is in the RUNNING state.
3. CProcess Q3 is in the RUNNABLE state.
4. DProcess Q3 is in the SLEEPING state.
5. EProcess Q4 is in the ZOMBIE state.
6. FProcess Q4 is in the SLEEPING state.

Official Key

Master Answer Key & Explanations

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

Reveal Key

Q1A

Q2C

Q3A

Q4B

Q5C

Q6D

Q7A

Q8C

Q9D

Q10A

Q11C

Q12D

Q13C

Q14B

Q15D

Q16B

Q17B, E

Q18A, B, D

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