This presentation gives the knowledge on the OS. It is inthe form of a quiz.

2. Before Operating System was developed, What was used to
interact with hardware?
Answer:
ASSEMBLY LANGUAGE
In around 1940s , computer
system was mainly used by
researchers, who were both
programmers as well as end users
of computer systems

3. What is Symmetric and Asymmetric multiprocessing?
Answer:
Asymmetric Symmetric
Each processor is assigned a specific task.
A master processor controls the system .
The scheme defines a master-slave
relationship
All processors are peers, No master slave
relationship.
Ex: mobile phones Ex: Solaris System Solaris is Unix
operating system.

4. What are the dual mode of Operating system?
Answer:
1. User mode
2. kernel mode
User mode is executed on behalf of user
whereas kernel mode is executed on behalf
of operating system
A bit is added to the hardware
of computer to indicate current
mode-
Kernel (0)
User (1)
This is known as mode bit.

5. What is von Neuman computer architecture?
Answer:
Von Neumann architecture is based on the
stored-program computer concept, where
instruction data and program data are stored in the
same memory.
Von Neumann is better for desktop computers,
laptops, workstations and high performance
computers.

6. Which system call is used to create a new process?
Answer:
fork()
System Calls are requests for a
service from the kernel of the
operating system on which it is
executed.
Which system call is used to terminate a process?
Answer:
kill()

7. What is Round robin scheduling Algorithm?
Answer:
To schedule processes fairly,
a round-robin scheduler generally
employs time-sharing, giving each job a
time slot or quantum
(its allowance of CPU time), and
interrupting the job if it is not completed by
then. The job is resumed next time a time
slot is assigned to that process.

8. What is Deadlock condition in process management of
operating system?
Answer:
When multiple process wait for
each other to free up resources and
thus all remain halted, this situation
is known as deadlock.

9. What does the heap section in process memory stores?
Answer:
Heap Section is the memory which is
dynamically allocated during runtime.
Where is the program code stored?
Answer:
Text section

10. Can you explain the memory hierarchy of following memory
units- Main memory, Auxillary memory, registers, Cache?
Answer:

11. Which type of operating system is used for embedded
applications?
Answer:
RTOS(real time operating system)
especially designed and developed for handling real
time applications, applications that are required to executed
within a period of time.
Types of operating system:
1. Batch processing operating system
2. Multi user operating system
3. Multitasking operating system
4. Real time operating system
5. Multi processor operating system
6. Embedded Operating systems.

12. Which command is used to show time and how can we avoid
to change it in cmd prompt?
Answer:
“time”, If the parameter /T is entered,
the command prompt only shows the time and
offers no option to directly change it.
Which command is used to see the content of a text file in
cmd prompt?
Answer:
type

13. For what the command “md ” is used in cmd prompt?
Answer:
Creates a new directory on the specified path.
Which command is used to see the environment variables in
cmd prompt?
Answer:
set
How can we see the list of all running processes in cmd
prompt?
Answer:
tasklist

14. THANK YOU