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operating systems Online Quiz - 4

Description: operating systems Online Quiz - 4
Number of Questions: 20
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Tags: operating systems
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BSD is an acronym for what?

technology operating systems

  1. Berkeley Software Distribution

  2. Berkel Software Distro

  3. Berkeley Systems Distribution

  4. Bourne Systems Distribution

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Correct Option: A

Which Shell variable indicates search path for commands?

technology operating systems

  1. IFS

  2. PATH

  3. SHLVL

  4. TERM

Show answer
Correct Option: B

A local variable can be used by child processes of a shell.
technology operating systems

  1. True

  2. False

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Correct Option: B

What is the first process that comes into existence whenever system is booted?
technology operating systems

  1. init

  2. shell

  3. kernel

  4. login

Show answer
Correct Option: C

What is the process id and group id of the init process?

technology operating systems

  1. 1,0

  2. 0,1

  3. 1,1

  4. 0,2

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Correct Option: A

Which of these is not a valid mode in the VI editor in unix?
technology operating systems

  1. command

  2. ex

  3. edit

  4. insert

Show answer
Correct Option: C

Which is not a filter in unix?
technology operating systems

  1. pg

  2. ksh

  3. awk

  4. grep

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Correct Option: B

What is the command for listing all the background jobs?
technology operating systems

  1. ps

  2. jobs

  3. processes

  4. kill

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Correct Option: B

What is the command for killing the suspended job number three?

technology operating systems

  1. kill $3

  2. kill <<3

  3. kill %3

  4. terminate #3

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Correct Option: C

Which of the following does one need to log in to Unix?
technology operating systems

  1. username

  2. password

  3. host name

  4. all of the above

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Correct Option: D

Which command always puts you in your home directory?
technology operating systems

  1. home

  2. cd

  3. cd . .

  4. pwd

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Correct Option: B

What will the following command do? % chmod og+r *.jpg
technology operating systems

  1. Change the permissions on all the .jpg file so that it is readable.

  2. It is not a valid command because the file name contains a *.

  3. Change the permissions on all image files

  4. Change permissions on the directory so that image files can be saved in it.

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Correct Option: A

Predict the output of the following program code main() { fork(); printf("Hello World!"); }
technology operating systems

  1. Hello World!Hello World!

  2. Hello World!

  3. World!Hello

  4. error

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Correct Option: A

main(){ fork(); fork(); fork(); printf("Hello World!"); } How many times "Hello World!" will be printed?

technology operating systems

  1. 2

  2. 4

  3. 6

  4. 8

Show answer
Correct Option: D

AI Explanation

To determine how many times "Hello World!" will be printed, let's analyze the given code.

In the code, the fork() function is called three times consecutively. Each time the fork() function is called, it creates a new process by duplicating the existing process. So, the first fork() call creates one child process, the second fork() call creates two child processes (one from the original process and one from the child process of the first fork() call), and the third fork() call creates four child processes (one from the original process, two from the child processes of the second fork() call, and one from the child process of the first fork() call).

Therefore, a total of 1 + 2 + 4 = 7 child processes are created, in addition to the original process. Since each process executes the printf("Hello World!"); statement, it will be printed 8 times in total.

So, the correct answer is D) 8.

Which system call is used to to bias the existing priority of a process?
technology operating systems

  1. exec()

  2. nice()

  3. brk()

  4. fork()

Show answer
Correct Option: B

A 'character special file' represents a device with characteristics similar to a ........ in unix [data transfer is by stream of bits in sequential order]
technology operating systems

  1. keyboard

  2. terminal

  3. server

  4. host

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Correct Option: A

When creating a directory, which of the following is true?
technology operating systems

  1. You use the pico Unix command to create a directory

  2. The default permissions are: r w x - - - - - -

  3. You must be in your home directory

  4. The directory name must end in _html

Show answer
Correct Option: C

What command allows you to log in to a remote host securely?
technology operating systems

  1. ssl

  2. slt

  3. ssh

  4. sl-rem

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Correct Option: C

Developer Ken Thompson of the Bell Labs Team developed what game for GE's machines?
technology operating systems

  1. .logout

  2. .clear

  3. leave out

  4. .leave

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Correct Option: A

What files are run when you log in successfully?

technology operating systems

  1. .cshrc

  2. .c

  3. .log

  4. .login

Show answer
Correct Option: A,D
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