Operating System Set 24 MCQs

Q1 | A process can never be sure that a signal it has sent

has which identifier

has not been lost

has been sent

all of the mentioned

Q2 | In UNIX, the system call is used to send a signal.

sig

send

kill

sigsend

Q3 | Thread pools are useful when

when we need to limit the number of threads running in the application at the same time

when we need to limit the number of threads running in the application as a whole

when we need to arrange the ordering of threads

none of the mentioned

Q4 | Instead of starting a new thread for every task to execute concurrently, the task can be passed to a

process

thread pool

thread queue

none of the mentioned

Q5 | 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

none of the mentioned

Q6 | What is the idea behind thread pools?

a number of threads are created at process startup and placed in a pool where they sit and wait for work

when a process begins, a pool of threads is chosen from the many existing and each thread is allotted equal amount of work

all threads in a pool distribute the task equally among themselves

none of the mentioned

Q7 | If the thread pool contains no available thread

the server runs a new process

the server goes to another thread pool

the server demands for a new pool creation

the server waits until one becomes free

Q8 | Thread pools help in

servicing multiple requests using one thread

servicing a single request using multiple threads from the pool

faster servicing of requests with an existing thread rather than waiting to create a new thread

none of the mentioned

Q9 | The number of the threads in the pool can be decided on factors such as

number of cpus in the system

amount of physical memory

expected number of concurrent client requests

all of the mentioned

Q10 | The swaps processes in and out of the memory.

Memory Manager

CPU

CPU Manager

User

Q11 | The address generated by the CPU is referred to as

Physical Address

Logical Address

Neither Physical nor Logical

None of the mentioned

Q12 | Operating System maintains the page table for

each process

each thread

each instruction

each address

Q13 | What is operating system?

collection of programs that manages hardware

system service provider to the

link to interface the hardware and

all of the mentioned

Q14 | 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

terminated state

Q15 | In virtual memory, which is not a page replacement algorithm ?

FIFO

BFS

LRU

Optimal

Q16 | Thrashing the CPU utilization.

increases

keep constant

decreases

None of the mentioned

Q17 | Mutual exclusion can be provided by the

mutex locks

binary semaphores

both mutex locks and binary

none of the mentioned

Q18 | A parent process calling system call will be suspended until children processes terminate.

wait

fork

exit

exec

Q19 | The child process completes execution, but the parent keeps executing, then the child process is known as

Orphan

Zombie

Body

Dead

Q20 | When the process issues an I/O request

It is placed in an I/O queue

It is placed in a waiting queue

It is placed in the ready queue

It is placed in the Job queue

Q21 | Which one of the following is the deadlock avoidance algorithm?

banker’s algorithm

elevator algorithm

karn’s algorithm

none of the mentioned

Q22 | File type can be represented by

file name

file extension

file identifier

none of the mentioned

Q23 | Which of the following are the two parts of the file name?

name & identifier

identifier & type

extension & name

type & extension

Q24 | Which of the following are forms of malicious attack?

Theft of information

Modification of data

Wiping of information

All of the mentioned

Q25 | From the following, which is not a common file permission?

Write

Execute

Stop

Read