HW 12.11.21

The following two functions P1 and P2 that share a variable B with an initial value of 2 execute concurrently.
P1()
{
C = B – 1;
B = 2*C;
}
P2()
{
D = 2 * B;
B = D - 1;
}
The number of distinct values that B can possibly take after the execution is
a) 3
b) 2
c) 5
d) 4
What type of memory stores data in a swap file on a hard drive?

a) Secondary memory
b) Virtual memory
c) Low memory
d) RAM
The PCB is identified by ___________.

a. Real-Number
b. Binary Number
c. Store block
d. Integer Process ID
Which of the following statement is correct about fragmentation?

a. It is software that connects the OS.
b. It is part of the software.
c. Loss the memory
d. All of the these
Which of the following operating systems supports only real-time
a) Batch OS
b) Distributed OS
c) Real-time OS
d) Network OS
Which of the following method is used to improve the main memory utilization?
a) Swapping
b) Operating system
c) Memory stack
d) None of these.
Disk Operating System (DOS) is an example of ___.

a) PC OS
b) Multi-processor OS
c) Distributed OS
d) Real-Time OS
Three processes arrive at time zero with CPU bursts of 16,20 and 10 10 milliseconds. If the scheduler has prior
knowledge about the length of the CPU bursts, the minimum achievable average waiting time for these three
processes in a non-preemptive scheduler (rounded to nearest integer) is _____________ milliseconds.
Which of the following component does not belong to PCB (Process Control Block)?
a) CPU registers
b) CPU scheduling information
c) Operating System information
d) Accounting information
Operating System is a _________ that provides an environment to help the user to execute the programs.
A form of processing known as spooling is an acronym for ___.
A typical operating system that supports a multiprogramming environment will be less than _________.
___ suggested the layered approach to lessen the design and implementation complexities of an operating system.
Increasing the RAM of a computer typically improves performance because
a) Virtual memory increases
b) Larger RAMs are faster
c) Fewer fault occurs
d) Fewer segmentation fault occurs
By using ___ techniques, an operating system can create the illusion that a process has its own processor with its
own memory.
a) CPU Scheduling
b) Virtual Memory
c) Both A and B
d) None of the above
Which of the following algorithms is used to avoid deadlock?

a) Dynamic Programming algorithm
b) Primality algorithms
c) Banker's algorithm
d) Deadlock algorithm
Which of the following scheduling reduces process flow time?

a) FCFS
b) LIFO
c) SJF
d) All of the these
___ is a part of UNIX OS.

a) Kernel
b) Module
c) Core
d) Software
In real systems CPU utilization ranges from ___ for a lightly loaded system to ___ for heavily loaded systems.
a) 40%, 90%
b) 50%, 50%
c) 90%, 40%
d) 25%, 75%
When a process is waiting for the CPU, we can say it is in ___ state.
a) Ready
b) New
c) Running
d) Waiting
If process Pi is executing in its critical section, then no other processes can be executing in their critical-sections.
This is called a ___.
a) Bounded Waiting
b) Mutual Exclusion
c) Progress
___ is a high-level synchronization construct that is a collection of procedures, variables and data structures
grouped together.
a) Semaphores
b) Processes
c) Monitor
A condition where at least one of the resources is non-shareable in a system is called ___.
a) Mutual Exclusion
b) Hold and Wait
c) Circular Wait
___ algorithm is used where resources have multiple instances.

a) Resource Allocation Graph
b) Banker’s
c) Resource Request
CPU switching from one process to another requires saving the state of the current process and loading the latest
state of the next process. This is known as a ___.
a) Program Switch
b) Context Switch
c) Process Switch
d) OS Switch
MAR stands for ___.
a) Memory Address Register
b) Memory Allocation Register
c) Main Address Register
d) Main Allocation Register
PTBR stands for ___.

a) Page Table Box Register
b) Page Table Base Register
c) Physical Table Base Register
d) Physical Table Box Register
Segments of user programs are allocated memory by the ___.

a) FCFC Scheduler
b) FIFO Scheduler
c) Bob Scheduler
d) LIFO Scheduler
When a process is to be executed then only that page of the process, which needs to be currently executed, is
swapped into memory. This method is called a ___.
a) Demand Paging
b) Request Paging
c) Swap Paging
d) Change Paging
Which of the following programs is loaded first when starting a computer?

a) Window desktop
b) Network connection program
c) Operating system
d) CMD
The operating system work between

a) User and Computer
b) Network and User
c) One user to another user
d) All of the these
Which of the following "semaphore" can take the non-negative integer values?
a) Binary Semaphore
b) Counting Semaphore
c) Real Semaphore
d) All of the these
A CPU generates 32-bit virtual addresses. The page size is 4 KB. The processor has a translation look-aside buffer
(TLB) which can hold a total of 128 page table entries and is 4-way set associative. The minimum size of the TLB
tag is:
a) 11
b) 13
c) 15
d) 20
Thrashing occurs when

a) When page fault occurs
b) Processes on system frequently access pages not memory
c) Processes on system are in running state
d) Processes on system are in waiting state
Given that a computer system has only 3 process.1st process is single threaded, 2nd process is two threaded and
3rd process is 4 threaded. So total how many number of page tables will be managed by the operating system?
Identify Correct Statements :

a) Forked Process shares the address space and other resources with the parent.
b) Forked Processes can't use multiprocessor for parallel execution.
c) Security is better in Process in comparison to threads.
d) Thread switching doesn't require Kernel Support unlike threads

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The following two functions P1 and P2 that share a variable B with an initial value of 2 execute concurrently.

What type of memory stores data in a swap file on a hard drive?

The PCB is identified by ___________.

Which of the following statement is correct about fragmentation?

Disk Operating System (DOS) is an example of ___.

A form of processing known as spooling is an acronym for ___.

Which of the following algorithms is used to avoid deadlock?

Which of the following scheduling reduces process flow time?

___ is a part of UNIX OS.

___ algorithm is used where resources have multiple instances.

PTBR stands for ___.

Segments of user programs are allocated memory by the ___.

Which of the following programs is loaded first when starting a computer?

The operating system work between

Thrashing occurs when

Identify Correct Statements :

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