Q. A preemptive type of process scheduling strategy:

View solution

Q. When a process is accessing shared modifiable data, the process is said to be in:

View solution

Q. The first MPI function call made by every MPI process is the call to:

View solution

Q. Dijkstra’s Banker’s algorithm is used for:

View solution

Q. Memory bank experiencing too much contention from processor:

View solution

Q. Consider a disk pack with 32 surfaces, 64 tracks and 512 sectors per pack. 256 bytes of data are stored in a bit serial manner in a sector. The number of bits required to specify a particular sector in the disk is

View solution

Q. Consider a system with 2 level cache. Access times of Level 1 cache, Level 2 cache and main memory are 0.5 ns, 5 ns and 100 ns respectively. The hit rates of Level 1 and Level 2 caches are 0.7 and 0.8 respectively. What is the average access time of the system ignoring the search time within the cache?

View solution

Q. To overcome difficulties in Readers-Writers problem, which of the following statement/s is/are true?

(i) Writers are given exclusive access to shared objects
(ii) Readers are given exclusive access to shared objects
(iii) Both Readers and Writers are given exclusive access to shared objects

View solution

Q. Suppose a system has 12 instances of some resource with n processes competing for that resource. Each process may require 4 instances of the resource. The maximum value of n for which the system never enters into deadlock is

View solution

Q. Dirty bit is used to show the

View solution

Q. Suppose for a process P, reference to pages in order are 1,2,4,5,2,1,2,4. Assume that main memory can accommodate 3 pages and the main memory has already 1 and 2 in the order 1 – first, 2 – second. At this moment, assume FIFO Page Replacement Algorithm is used then the number of page faults that occur to complete the execution of process P is

View solution

Q. Suppose P, Q and R are co-operating processes satisfying Mutual Exclusion condition. Then, if the process Q is executing in its critical section then

View solution

Q. A process residing in Main Memory and Ready and Waiting for execution, is kept on

View solution

Q. At a particular time of computation, the value of a counting semaphore is 10. Then 12 P operations and “x” V operations were performed on this semaphore. If the final value of semaphore is 7, x will be:

View solution

Q. In a multi-user operating system, 30 requests are made to use a particular resource per hour, on an average. The probability that no requests are made in 40 minutes, when arrival pattern is a poisson distribution, is ...............

View solution

Q. Normally user programs are prevented from handling I/O directly by I/O instructions in them. For CPUs having explicit I/O instructions, such I/O protection is ensured by having the I/O instructions privileged. In a CPU with memory mapped I/O, there is no explicit I/O instruction. Which one of the following is true for a CPU with memory mapped I/O?

View solution

Q. Which of the following statements are true?

(a) External Fragmentation exists when there is enough total memory space to satisfy a request but the available space is contiguous.
(b) Memory Fragmentation can be internal as well as external.
(c) One solution to external Fragmentation is compaction.

View solution

Q. Page information in memory is also called as Page Table. The essential contents in each entry of a page table is/are ....................

View solution

Q. Consider a virtual page reference string 1, 2, 3, 2, 4, 2, 5, 2, 3, 4. Suppose LRU page replacement algorithm is implemented with 3 page frames in main memory. Then the number of page faults are .................

View solution

Q. In which of the following scheduling criteria, context switching will never take place?

View solution