NPTEL Introduction to Operating Systems Week 4 Assignment Answers 2024
1. When an interrupt occurs the privilege level at the CPU is changed to __ from ______________.
- ring 0 , ring 3
- ring 1 , ring 2
- ring 2 , ring 1
- ring 3 , ring 0
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2. Which of the following acts as a cache for page table mappings?
- TLB
- DCache
- GDT
- LDT
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3. State True or False
INTR is the instruction used in x86 to generate software interrupts.
- True
- False
Answer :-
4. A system has 5 processes, where the scheduling used is non-preemptive. What is the total number of scheduling possible__________?
Answer :-
5. The number returned by a successful “write” system call handler indicates:
- The number of bytes written to the file descriptor
- The return status of the system call
- The system call number for write
- None of the above
Answer :-
6. State True or False
Kernel stack is used to store the function arguments during system calls.
- True
- False
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7. What is the minimum number of traditional 8 input pin PICs required to interface 32 devices with CPU?
- 8
- 4
- 32
- 2
Answer :-
8. State True or False
Stack switching happens during nested interrupt handling.
- True
- False
Answer :-
9. Consider a system having 5 CPUs, 9 processes. The upper bound of the number of processes in the RUNNING state is _____________, and BLOCKED states is __________. (write the option such that the first is the answer for the first blank, and the second is for the second blank)
Answer :-
10. What are the data structures used to obtain the interrupt handler of an interrupt?
- IDT alone
- GDT alone
- Both IDT and GDT
- stack
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