OSG202 - HaiAnh Questions + Answers Graded A+

OSG202 - HaiAnh
Which is not an example of a resource that is commonly time-multiplexed? *
1/1
CPU
Graphics accelerator
Main memory
Network interface - ✔️✔️C


Consider a computer system that has cache memory, main memory (RAM) and disk,
and OS uses virtual memory. It takes 2 nsec to access a byte from the cache, 20 nsec
to access a byte from RAM, and 10 msec to access a block of 1000 bytes from the disk.
If a book has 1000 pages, each with 50 lines of 80 characters each, How long it will take
to electronically scan the text for the case of the master copy being in each of the level
as one proceeds down the memory hierarchy (from inboard memory to offline storage)?
*
1 msec, 10 msec, 5 sec
1 msec, 10 msec, 10 sec
2 msec, 20 msec, 10 sec
4 msec, 40 msec, 20 sec - ✔️✔️D


Which of the following statements about the CPU's handling interrupts is incorrect? *
None of the other choices
The CPU branches to a new instruction sequence
The hardware saves the old PC location
The processor ceases to execute the current sequence of instructions - ✔️✔️None of
the other choices

____ is the partitioning of a single server, each of which can support a different
operating *
Multiprocessing
Multithreading
Shared processing
Virtualization - ✔️✔️D

Consider a computer system that has cache memory, main memory (RAM) and disk,
and OS uses virtual memory. It takes 1 nsec to access a word from the cache, 10 nsec
to access a word from RAM, and 10 msec to access a word from the disk. If the cache
hit rate is 95% and main memory hit rate is 99%, what is average time to access a
word? *
a. 1.445 nsec
b. 5,001.445 nsec
c. 5,000.495 nsec

,d. 5,000.95 nsec - ✔️✔️B

Booting a general purpose computer involves the following steps except *
a. Loading the OS
b. Loading the command interpreter
c. Loading one or more bootstrap loaders
d. Execution of a ROM-based POST sequence - ✔️✔️B

As one proceeds down the memory hierarchy (from inboard memory to offline storage),
which of the following conditions is correct? *
Decreasing access time
None of the other choices
Decreasing cost per bit
Decreasing capacity - ✔️✔️C

The two basic types of processor registers are: *
User-visible and user-invisible registers
None of the other choices
Control and Status registers
General and special registers - ✔️✔️D


The main characteristics of layered system does not include: *
A. Upper layer can only call functions of closely lower layer
B. Each layer has well defined functions
C. Each layer runs independently
D. Many layers - ✔️✔️C

Which of special register in the CPU points to the top of the current stack in the
memory? *
PC
PSW
IR
SP - ✔️✔️D

A CPU may have multiple execution units, so that can carry out multiple instructions in
the same time is called: *
0/1
None of the other choices
Multicore
Pipeline
Superscalar - ✔️✔️D

Consider a computer system that has cache memory, main memory (RAM) and disk,
and OS uses virtual memory. It takes 2 nsec to access a word from the cache, 20 nsec

,to access a word from RAM, and 10 msec to access a word from the disk. If the cache
hit rate is 95% and main memory hit rate is 99%, what is average time to access a
word? *
5,000.99 nsec
5,002.89 nsec
2.89 nsec
5,001.9 nsec - ✔️✔️B

Information that must be saved prior to the processor transferring control to the interrupt
handler routine includes: *
0/1
PSW
None of the other choices
PSW and Contents of processor registers
PSW and PC - ✔️✔️D

Examples of general purpose stored program computers include the following except *
0/1
Personal computers
Network servers
Workstations
MP3 player - ✔️✔️D

The ways that input/output can be done is? *

DMA (Direct Memory Access)
All of the other choices
Busy waiting
Interrupt - ✔️✔️B

List of memory location, that contains the executable program, the program's data, and
its stack is called: *
0/1
set of resources
all of the other choices

address memory
address space - ✔️✔️D

Which is not an example of a resource that is commonly space-multiplexed? *
0/1
Video RAM
Main memory
CPU
Hard drive - ✔️✔️C

, Which of the following is not a step in the boot process? *
1/1
The BIOS is activated by powering on the CPU
Configuration and customization settings are checked
The antivirus program checks all files for viruses
The operating system is loaded into RAM - ✔️✔️C

Which of special register contains the Mode Bit (user or kernel)? *
1/1
Program Counter (PC)
None of the other choices
Program Status Word (PSW)
Instruction Register (IR) - ✔️✔️C

Where is the position of the operating system in computer system:
1/1
Above the hardware and under the user interface program
Between the user interface program and the application Program
In user space
None of the other choices - ✔️✔️A

Which of the main bus in the IBM PC computer that can run at 66 MHz and transfer 8
bytes at a time? *
1/1
PCI (Peripheral Component Interconnect)
ISA (Industry Standard Architecture)
None of the other choices
ISA and PCI - ✔️✔️A

Which of the following statements about Electrically Erasable PROM (EEPROM) is
correct? *
1/1
Can be erased and rewritten
Unprogrammable
Volatile
None of the other choices - ✔️✔️A

The major operating system services provide mechanisms for secure and efficient are: *
1/1
Communication between processes
All of the other choices
Execution of a program, I/O operations performed by it, and detecting and reporting
errors caused by it
File manipulation - ✔️✔️B

Which of the following instructions should be allowed only in kernel mode? *