Operating System MCQs with Answers
Practice important Operating System MCQs with answers and explanations.
Chapter: 41
Q1101:
In which of the following cases will thrashing occur?
A. When there are not enough frames for processes
B. When there is high CPU utilization
C. When there are no page faults
D. When there is no swapping of pages
Correct Answer:
A
Chapter: 41
Q1102:
Local page replacement helps in preventing which of the following?
A. Global page replacement
B. Thrashing in one process
C. High CPU utilization
D. High page fault rate
Correct Answer:
B
Chapter: 41
Q1103:
What is the main benefit of local page replacement?
A. It replaces pages without regard to the process
B. It prevents one process from causing thrashing in others
C. It increases CPU utilization
D. It reduces page fault frequency
Correct Answer:
B
Chapter: 41
Q1104:
What is the working set model based on?
A. Page fault frequency
B. Locality of reference
C. Degree of multiprogramming
D. Global page replacement
Correct Answer:
B
Chapter: 41
Q1105:
What does the working set size (WSS) of a process represent?
A. The number of frames required by the process
B. The total number of pages used by all processes
C. The total demand for frames
D. The number of page faults in a process
Correct Answer:
A
Chapter: 41
Q1106:
What happens if the total demand for frames exceeds the available frames?
A. Thrashing occurs
B. System performance improves
C. CPU utilization increases
D. Disk utilization decreases
Correct Answer:
A
Chapter: 41
Q1107:
What does the accuracy of the working set model depend on?
A. The selection of the working set window (∆)
B. The size of the memory available
C. The type of CPU used
D. The number of processes in the system
Correct Answer:
A
Chapter: 41
Q1108:
What is the main drawback of using a very small ∆ in the working set model?
A. It will not encompass the entire locality
B. It will include unnecessary pages
C. It will require excessive memory
D. It will lead to faster page faults
Correct Answer:
A
Chapter: 41
Q1109:
How does the page fault frequency method control thrashing?
A. It keeps track of page fault rates and adjusts frame allocation
B. It increases the degree of multiprogramming
C. It uses a larger page size
D. It monitors CPU utilization
Correct Answer:
A
Chapter: 41
Q1110:
What is the benefit of pre-paging in demand paging systems?
A. It reduces initial page faults
B. It reduces memory utilization
C. It increases disk usage
D. It reduces the need for page replacement
Correct Answer:
A
Chapter: 41
Q1111:
Which of the following page sizes typically leads to reduced I/O overhead?
A. Smaller page sizes
B. Larger page sizes
C. The size does not affect I/O overhead
D. Both large and small page sizes have the same I/O overhead
Correct Answer:
A
Chapter: 41
Q1112:
In which situation is a smaller page size more desirable?
A. When minimizing internal fragmentation
B. When reducing page fault frequency
C. When reducing CPU usage
D. When optimizing disk I/O transfer times
Correct Answer:
A
Chapter: 41
Q1113:
What is one issue with using larger page sizes?
A. Increased page table size
B. Increased internal fragmentation
C. Reduced memory utilization
D. Increased CPU utilization
Correct Answer:
B
Chapter: 41
Q1114:
What is a key consideration when choosing a page size?
A. Balancing between memory fragmentation and I/O time
B. Only minimizing I/O time
C. Reducing CPU utilization
D. Increasing the size of the page table
Correct Answer:
A
Chapter: 41
Q1115:
How does program structure affect performance in a demand paging system?
A. Sequential access is preferred
B. Random access is preferred
C. Programs with larger arrays perform better
D. Programs that access memory in any order perform better
Correct Answer:
A
Chapter: 41
Q1116:
What type of memory access pattern causes fewer page faults in a demand-paged system?
A. Sequential access
B. Random access
C. Accessing memory in a scattered pattern
D. Accessing memory in a reverse order
Correct Answer:
A
Chapter: 41
Q1117:
What kind of data structure is considered "good" for demand paging?
A. Stack
B. Hash table
C. Binary search tree
D. Linked list
Correct Answer:
A
Chapter: 41
Q1118:
What is the primary concern with accessing memory randomly in a demand-paged system?
A. It causes more page faults
B. It results in better memory utilization
C. It reduces CPU utilization
D. It reduces the need for page replacement
Correct Answer:
A
Chapter: 41
Q1119:
In a demand paging system, which of the following helps to improve performance?
A. Minimizing page faults
B. Increasing the degree of multiprogramming
C. Installing a faster CPU
D. Increasing disk I/O operations
Correct Answer:
A
Chapter: 41
Q1120:
What should be done to improve CPU utilization in a system experiencing thrashing?
A. Decrease the degree of multiprogramming
B. Increase the number of processes
C. Increase page size
D. Install more main memory
Correct Answer:
A