Operating System :: Basic Concepts (OS Structures )

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 Which statement about OS booting is wrong?

AA cold boot is when power to a computer is cycled (turned off and then on) or a special reset signal to the processor is triggered.

BA warm reboot is restarting a computer under software control, without removing power or (directly) triggering a reset line.

CA hard reboot is restarting a computer under software control, without removing power or (directly) triggering a reset line.

DA bootstrapping process is one which starts operating systems when the user turns on a computer system.

Answer: Option C

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 A computer program or routine is described as reentrant if the routine can be re-entered while it is already running. Which of the following conditions is not correct to be reentrant?

AMust hold no static or global non-constant data

BMust not return the address to static or global non-constant data

CMust not rely on locks to singleton resources

DCan call non-reentrant computer programs or routines

Answer: Option D

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 what is the electronic signal that cause computer to stop current program?

Asignal

Binterrupt

Cshell

Dcommand

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Answer: Option B

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 Word alignments

Aaligning the address to the next word boundary of the machine

Baligning to even boundary

Caligning to word boundary

DNone of these

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Answer: Option A

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 What is a running program under execution called?

ATask

BJob

CProcess

DAny of the above

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Answer: Option D

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 Amount of work a computer can do in a given period is called

AThroughput

BJob

CProcess

DNone of these

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Answer: Option A

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 In 8085 microprocessor READY signal does.which of the following is incorrect statements

AIt is input to the microprocessor

BIt sequences the instructions

CIt sequences the output of the microprocessor

DNone of these

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Answer: Option B

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 The status of the kernel is?

Atask

Bprocess

Cnot defined

DNone of these

Answer: Option B

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 The 8085A is a(n):

A16-bit parallel CPU

B8-bit serial CPU

C8-bit parallel CPU

DNone of these

Answer: Option C

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 Consider the following program

void main () {
int i = 7
if (0 = = fork ())
i + = 10;
else {
Wait (0);
printf ("d",i);
}
}

AThe statement i + = 10 is executed by the child only

BThe statement i + = 10 is executed by the parent only

CThe child can start executing, only after the termination of the parent process

DNone of these

Answer: Option C

Explanation:

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