Question

QUESTION 21

1. chmod +t is used to:

   		set timing information
   		set group information
   		set sticky bit
   		set transit information

1 points   

QUESTION 22

1. When two or processes are waiting indefinitely for an event that can be caused by only one of the waiting processes, we call this as:

   		Race condition
   		Deadlock
   		Starvation
   		None of the above

1 points   

QUESTION 23

1. ___________ is a fast disk space, large enough to store data for all users.

   		Hard disk
   		Main memory
   		Backing store
   		Registers

1 points   

QUESTION 24

1. Kernel-level threads are scheduled onto:

   		System contention scope
   		Process contention scope
   		Both of the above
   		None of the above

1 points   

QUESTION 25

1. DMA stands for:

   		Device Memory Access
   		Device Memory Access
   		Direct Memory Access
   		Device Multiple Access

1 points   

QUESTION 26

1. _________ is only used for redundancy.

   		RAID 0
   		RAID 1
   		RAID 4
   		RAID 5

1 points   

QUESTION 27

1. storage that CPU can access: (choose all that apply)

   		Registers
   		Main memory
   		Hard disk
   		Virtual memory

1 points   

QUESTION 28

1. ___________interrupt are those which can be handled after the execution of current instruction

   		Maskable
   		Non-maskable
   		generated form device
   		not generated from device

1 points   

QUESTION 29

1. _______ transmission have start and stop bits.

   		character
   		block
   		synchronous
   		asynchronous

1 points   

QUESTION 30

1. Disk access time is determined using: (choose all that apply)

   		disk arm length
   		rotational latency
   		cylinder size
   		seek time

Answer 1

QUESTION 21: set group information.

QUESTION 22: deadlock

The implementation of a semaphore with a waiting queue may result in a situation where two or more processes are waiting indefinitely for an event that can be caused only by one of the waiting processes. ... When such a state is reached, these processes are said to be deadlocked.

QUESTION 23: hard disk.

The easiest way to keep all of your digital files safe is to simply buy an external hard drive

QUESTION 24: system-contention scope

On operating systems that support them, it is kernel-level threads—not processes—that are being scheduled by the operating system. User-level threads are managed by a thread library, and the kernel is unaware of them. ... To decide which kernel thread to schedule onto a CPU, the kernel uses system-contention scope (SCS).

QUESTION 25: direct memory acess

QUESTION 26: raid 1

RAID 1 requires a minimum of two disks to work, and provides data redundancy and failover. It reads and writes the exact same data to each disk.

QUESTION 27: Registers,Main memory.Hard disk Virtual memory

QUESTION 28: maskable

Maskable Interrupts are those which can be disabled or ignored by the microprocessor. These interrupts are either edge-triggered or level-triggered, so they can be disabled. INTR, RST 7.5, RST 6.5, RST 5.5 are maskable interrupts in 8085 microprocessor.

Non-Maskable Interrupts are those which cannot be disabled or ignored by microprocessor. TRAP is a non-maskable interrupt. It consists of both level as well as edge triggering and is used in critical power failure conditions.

QUESTION 29: asynchronus

exp: The start and stop bits are used in asynchronous communication as a means of timing or synchronizing the data characters being transmitted. Without the use of these bits, the sending and receiving systems will not know where one character ends and another begins

QUESTION 30: rotation latency , seek time

exp:

Access Time is calculated by summation of the following:

(a). Seek Time
(b). Rotational Latency
(c). Command Processing Time
(d). Settle Time