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Operating systems exams - multiple choice questions (MCQ) and answers
Operating
Systems MCQ – Set 10
1. Which one of the following is FALSE?
(a) User level threads are
not scheduled by the kernel
(b) When a user level
thread is blocked, all other threads of its process are blocked
(c) Context switching
between user level threads is faster than context switching between kernel level
threads.
(d) Kernel level threads cannot share the code segment
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Ans : (d)
Answer: (d) Kernel level threads cannot share the code segment
Thread
shares information like data segment, code segment, open files etc. with its
peer threads while it contains its own registers, stack, counter etc. Mostly
threads share the memory and the resources of any process to which they fit
in. Kernel level threads can share the code segment within the same process.
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2. Which one of the following is an
advantage of multiprocessor systems?
(a) Increased modularity
(b)
Increased reliability
(c) Increased security
(d) None of above
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Ans : (b)
Answer: (b) Increased reliability
Increased
reliability is one of the advantages of multiprocessor systems. More work can
be completed in short time due to the increase in number of processor.
The
other advantages are Reduced cost and Increased throughput.
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3. System calls to allocate and free
memory belongs to which of the operating system service category below:
(a) Device manipulation
(b) File manipulation
(c) Information
maintenance
(d)
Process control
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Ans : (d)
Answer: (d) Process control
Process control is one type of system calls.
Allocating and freeing memory is one of the functions of process control
system call.
The
other functions include;
- Crate
and terminate process
- Get
and set process attributes
- Wait
for time, wait event and signal event
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4. The scheduler that brings processes
into memory and swaps them out on disk as needed is referred to as:
(a) Short-term scheduler
(b) Long-term scheduler
(c)
Medium-term scheduler
(d) None of the above
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Ans : (c)
Answer: (c) Medium-term
scheduler
A scheduler is an operating system program
(module) that selects the next job to be admitted for execution.
The
use of medium term scheduler is to improve multiprogramming by allowing
multiple processes to reside in main memory by swapping out processes that
are waiting (need I/O) or low priority processes and swapping in other
processes that were in ready queue.
Most
of the processes require some I/O operation. In that case, it may become
suspended for I/O operation after running a while. It is beneficial to remove
these processes (suspended) from main memory to hard disk to make room for
other processes. At some later time these processes can be reloaded into
memory and continued where from it was left earlier. Saving of the suspended
process is said to be swapped out or rolled out. The process is swapped in
and out by the medium term scheduler.
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5. In an operating system a utility which
lets the users issue and execute commands from the keyboard is called ______
(a) Terminal Handler
(b)
Command Interpreter
(c) Kernel
(d) None of the above
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Ans : (b)
Answer: (b) Command
Interpreter
What is Command
Interpreter
A
command interpreter is the part of an Operating System that understands and executes
commands that are entered interactively by a human being or from a program. A
user can interact with the operating system through a special process, the
command interpreter using a command language. In most UNIX based operating
systems, the command interpreter is called the shell.
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