Operating System Mock Test 2

10%

Question 1 of 10

1. The segment of code in which the process may change common variables, update tables, write into files is known as ____________

program

critical section

synchronizing

non - critical section

Question 1 of 10

Question 2 of 10

2. To ensure difficulties do not arise in the readers - writers problem _______ are given exclusive access to the shared object.

readers

writers

none of the mentioned

readers and writers

Question 2 of 10

Question 3 of 10

3. For Mutual exclusion to prevail in the system ____________

the processor must be a uniprocessor rather than a multiprocessor

there must be at least one resource in a sharable mode

all of the mentioned

at least one resource must be held in a non sharable mode

Question 3 of 10

Question 4 of 10

4. Round robin scheduling falls under the category of ____________

Preemptive scheduling

Non-preemptive scheduling

None of the mentioned

All of the mentioned

Question 4 of 10

Question 5 of 10

5. What are Spinlocks?

Locks that work better on multiprocessor systems

Locks that avoid time wastage in context switches

All of the mentioned

CPU cycles wasting locks over critical sections of programs

Question 5 of 10

Question 6 of 10

6. The portion of the process scheduler in an operating system that dispatches processes is concerned with ____________

assigning running processes to blocked queue

assigning ready processes to CPU

all of the mentioned

assigning ready processes to waiting queue

Question 6 of 10

Question 7 of 10

7. What are the operations that can be invoked on a condition variable?

hold & wait

wait & signal

continue & signal

signal & hold

Question 7 of 10

Question 8 of 10

8. In the write ahead logging a _____________ is maintained.

a memory

a disk

a log record

a system

Question 8 of 10

Question 9 of 10

9. TestAndSet instruction is executed ____________

atomically

periodically

none of the mentioned

after a particular process

Question 9 of 10

Question 10 of 10

10. Consider the methods used by processes P1 and P2 for accessing their critical sections whenever needed, as given below. The initial values of shared boolean variables S1 and S2 are randomly assigned. (GATE 2010)

Method used by P1 :
while(S1==S2);
Critical section
S1 = S2;

Method used by P2 :
while(S1!=S2);
Critical section
S2 = not(S1);

Which of the following statements describes properties achieved?

Progress but not mutual exclusion

Neither mutual exclusion nor progress

Mutual exclusion but not progress

Both mutual exclusion and progress

Question 10 of 10