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operating systems Online Quiz - 89

Description: operating systems Online Quiz - 89
Number of Questions: 20
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Tags: operating systems
Attempted 0/20 Correct 0 Score 0
  1. 1 A dummy device to represent memory

  2. 2 A dummy device to represent the processor

  3. 3 A dummy device to provide infinite number of zeros

  4. 4 None


Correct Option: C

5 What is /dev/full device in Linux?

  1. 1 A device file to represent that the current file system is full

  2. 2 A device file to test scenarios of testing a /dev/full

  3. 3 Invalid device

  4. 4 None


Correct Option: B

6 What is /dev/random device?

  1. 1 A dummy device to represent swap

  2. 2 A dummy device to represent any device

  3. 3 A dummy device to provide infinite number of randon numbers

  4. 4 Invalid device


Correct Option: C
  1. 1 lseek(), open(), write(), close()

  2. 2 open(), write(), lseek(), close()

  3. 3 open(), lseek(), open(), , write() close()

  4. 4 None


Correct Option: B
  1. 1 vforlk() allows more one child process to be created simaltaneously whereas for() allows only one

  2. 2 vfork() retains same PID for child & parent known as virtual PID

  3. 3 vfork() suspends the parent process until child process exits

  4. 4 fork() & vfork() are same


Correct Option: C
  1. 1 getenv(), setenv()

  2. 2 getenv(), putenv()

  3. 3 readenv(), writeenv()

  4. 4 You cannot environmement variables inside a program


Correct Option: B
  1. 1 Wakes up kernel from sleeping

  2. 2 Wakes up devices from sleeping

  3. 3 Invokes a kernel to send SIGALARM to the calling process

  4. 4 Invokes a kernel to send SIGALARM to the registered process


Correct Option: D
  1. 1 A memeory shared between kernel & devices

  2. 2 A memory shared between root user and ordinary user

  3. 3 A memory shared across processes

  4. 4 Harddisk


Correct Option: C

13 What is a zombie interval?

  1. 1 The interval between child terminating and the parent calling wait()

  2. 2 The interval between parent terminating and the child calling popen()

  3. 3 The interval between parent terminating and the child termination

  4. 4 None


Correct Option: B

14 How do I get my program to act like a daemon?

  1. 1 Run with root user

  2. 2 Run with &

  3. 3 Run with root user using &

  4. 4 None


Correct Option: D

15 Why do processes never decrease in size?

  1. 1 They never releases the memory utilized

  2. 2 They release the memory but kernel does not use them

  3. 3 Since they are running

  4. 4 It’s a false statement


Correct Option: B
  1. 1 Its not possible

  2. 2 use isused() function

  3. 3 Try to open file with locking enabled

  4. 4 Try to write the file after opening


Correct Option: C
  1. 1 Use filelock()

  2. 2 use lockfile()

  3. 3 Use lockfd()

  4. 4 use fcntl()


Correct Option: D
  1. 1 Use ls -l

  2. 2 Use sizeof()

  3. 3 Use filesize()

  4. 4 Use fstat()


Correct Option: D
  1. 1 Use getmemory()

  2. 2 Use sysctl()

  3. 3 Use freemem()

  4. 4 Use malloc()


Correct Option: B

21 What is a socket

  1. 1 A port to connect printer 2

  2. A port to connect keyboard

  3. 3 An abstraction to pass data across processes

  4. 4 A hardware device


Correct Option: C

22 What is a semaphore

  1. 1 A mechanism to share non-sharable resources

  2. 2 A mechanism to access memory very fast

  3. 3 A mechanism to access kernel details

  4. 4 None


Correct Option: A
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