1. If a process needs I/O to or from a disk, and if the drive or controller is busy then
-
the request will be placed in the queue of pending requests for that drive
the request will not be processed and will be ignored completely
the request will be not be placed
2. If multiple threads are concurrently searching through a database and one thread returns the result then the remaining threads must be
-
continued
cancelled
protected
3. Signals that occur at the same time, are presented to the process
-
one at a time, in a particular order
one at a time, in no particular order
all at a time
4. Which of the following is not TRUE?
-
processes may send each other signals
kernel may send signals internally
a field is updated in the signal table when the signal is sent
5. The usual effect of abnormal termination of a program is
-
core dump file generation
system crash
program switch
6. .................... provides the interface to access the services of the operating system.
-
API
Library
System call
7. Which of the following was the first widely used multiuser, multitasking OS?
-
Unix
MS-DOS
Windows 3.0
8. A process can never be sure that a signal it has sent
- has which identifier
has not been lost
has been sent
9. Instead of starting a new thread for every task to execute concurrently, the task can be passed to a
-
process
thread pool
thread queue
10. Each connection arriving at multi threaded servers via network is generally
-
is directly put into the blocking queue
is wrapped as a task and passed on to a thread pool
is kept in a normal queue and then sent to the blocking queue from where it is dequeued
11. Disk Operating System (DOS) is an example of ___.
-
PC OS
Multi-processor OS
Distributed OS
12. ___ algorithm is used where resources have multiple instances.
-
Resource Allocation Graph
Banker’s
Resource Request
13. MAR stands for ___.
-
Memory Address Register
Memory Allocation Register
Main Address Register
14. Segments of user programs are allocated memory by the ___.
-
FCFC Scheduler
FIFO Scheduler
Bob Scheduler
15. Which of the following is not an operating system?
-
UNIX
MS-DOS
CP/M
16. In a time-sharing operating system, when the time slot given to a process is completed, the process goes from the running state to the :
-
Blocked state
Ready state
Suspended state
17. Which one of the following is a synchronization tool?
-
thread
pipe
semaphore
18. Computer system is divided into how many numbers of components?
19. Process synchronization can be done on
-
hardware level
software level
both (a) and (b)
20. Which one of the following is the deadlock avoidance algorithm?
-
banker’s algorithm
round-robin algorithm
elevator algorithm
21. For effective operating system, when to check for deadlock?
-
every time a resource request is made
at fixed time intervals
both (a) and (b)
22. Which of the following is an example of a spooled device?
-
A graphic display device
A line printer used to print the output of a number of jobs
A secondary storage device in a virtual memory system
23. Operating system is resident in memory of which part?
-
Middle
Lower
Upper
24. Operating System maintains the page table for
-
each process
each thread
each instruction
25. Because of virtual memory, the memory can be shared among
-
processes
threads
instructions
26. _____ is the concept in which a process is copied into main memory from the secondary memory according to the requirement.
-
Paging
Demand paging
Segmentation
27. The pager concerns with the
-
individual page of a process
entire process
entire thread
28. Swap space exists in
-
primary memory
secondary memory
CPU
29. A memory buffer used to accommodate a speed differential is called
-
stack pointer
cache
accumulator
30. The Operating System should work in a network as well as ___ environment.
-
diverted
data
distributed
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