Wednesday, April 1, 2020

Operating systems true and false questions set 9

Operating systems TRUE / FALSE questions for competitive exams with answers justified

Operating Systems Quiz with Answers - 8

1. Threads within the same process share the same heap and stack.
(a) TRUE                                                   (b) FALSE
Answer: FALSE. Each Thread must have its own stack – whether or not it shares a process with another thread. [source: UCB]

2. A process makes a system call to read a packet from the network device, and blocks. The scheduler then context-switches this process out. This is an example of a voluntary context switch.
(a) TRUE                                                   (b) FALSE
Answer: TRUE. A voluntary context switch occurs when a thread blocks because it requires a resource that is unavailable. An involuntary context switch takes place when a thread executes for the duration of its time slice or when the system identifies a higher-priority thread to run. [source: IITB]

3. An operating system that implements on-demand paging on a machine with software TLB miss handling (such as MIPS) must use an inverted page table.
(a) TRUE                                                   (b) FALSE
Answer: FALSE. A machine with a software TLB can utilize any format of page table, since the page table walk is handled in software. [source: UCB]

4. If the banker's algorithm finds that it's safe to allocate a resource to an existing thread, then all threads will eventually complete.
(a) TRUE                                                   (b) FALSE
Answer: FALSE. The banker’s algorithm simply prevents resource-related deadlock. One of the threads could still go into an infinite loop and fail to complete. [source: UCB]

5. Periodically yielding the processor while spin waiting reduces the amount of wasted time to be proportional to the duration of a context-switch.
(a) TRUE                                                   (b) FALSE
Answer: TRUE. When this process yields because it can’t acquire the lock, the scheduler will pick another process to run (that hopefully has useful work to do), at the cost of a context-switch [source: Wisconsin]



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