Question

chmod +t is used to:

1) set timing information

2) set group information

3) set sticky bit

4) set transit information

QUESTION 11

1. Registers are faster storage where most frequently used data is being stored.

   True

   False

1 points   

QUESTION 12

1. Socket interface separates network protocol from network operations.

   True

   False

1 points   

QUESTION 13

1. User-level threads scheduling competition in within System Contention Scope (SCS).

   True

   False

1 points   

QUESTION 14

1. Dirty frames are the frames which are blank (having no data).

   True

   False

1 points   

QUESTION 15

1. Total disk access time is equal to seek time + rotational latency.

   True

   False

1 points   

QUESTION 16

1. Information related to Program Counter can be found in PCB.

   True

   False

1 points   

QUESTION 17

1. One of the solutions to the critical section problem is Mutex.

   True

   False

1 points   

QUESTION 18

1. Binary semaphore is also called a Mutex.

   True

   False

1 points   

QUESTION 19

1. Magnetic Disks are sequential access devices.

   True

   False

1 points   

QUESTION 20

1. Paging may cause external fragmentation.

   True

   False

Answer 1

10) chmod +t is used to set the sticky bit that is option C .

If we set the sticky bit in any directory then only the owner of the directory , the file owner or the root owner can access the file that is either delete or rename it , unlike without sticky bit where any user having the execution rights can do so.

11) True as registers are present inside the CPU so the overhead required to communicate with the other peripherals outside the CPU is eliminated . And the registers become faster storage .

12) True as the socket provides an interface which is low level between the network protocols and the operations which the network performs.

13) False as the threads of same process compets within the process contention scope and the threads of different process altogether competes within the system contention scope .

14) True , as the dirty frames are the frames which are blank and are used for synchronization purpose.

15) False as the disk access time is the total time that is required to process and retrieve any information from the disk storage system by the computer and the disk access time is the summation of access time and data transfer time. where access time is the summation of seek time , rotational latency ,time to process the command and the settle time.

16) True as when a program starts executing all the information related to its status is stored in PCB block of that process such as information related to files ,. Program counter , stack pointer , etc.

17) True , Mutex is a software solution to critical section problem.

18) True , Binary semaphores are also called mutex because it acts as a mutex lock as it can acquire two values that is either 1 or 0.

19) True as magnetic disks' memory are accessed in a sequential manner and thus it is a sequential access device.

20) False , paging does not cause external fragmentation but causes internal fragmentation , as paging divides the virtual memory space into equal and fixed size pages and physical memory into fixed size frames.

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