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Operating-systems Questions Set 15:

Quiz Mode

How many states are there in the process lifecycle management?

Solution:

For large data transfers, _____ is used.

DMA

Programmed I/O

Controller register

None of the mentioned

Solution:

Which system call will cause a parent process to be suspended until its child processes terminate?

wait

fork

exit

exec

Solution:

CineBlitz multimedia server supports

real time clients

non-real time clients

both real and non-real time clients

None of the mentioned

Solution:

What is thrashing?

When a page fault occurs

Processes on the system frequently access pages not in memory

Processes on the system are in a waiting state

Processes on the system are in a running state

Solution:

In the context of compilers, which of the following is/are NOT an intermediate representation of the source program?

Three address code

Abstract Syntax Tree (AST)

Control Flow Graph (CFG)

Symbol table

Solution:

Assume that in a certain computer, the virtual addresses are 64 bits long and the physical addresses are 48 bits long. The memory is word addressable. The page size is 8k Band the word size is 4 bytes. The Translation Look-aside Buffer (TLB) in the address translation path has 128 valid entries. At most how many distinct virtual addresses can be translated without any TLB miss?

16 * 2¹⁰

8 * 2²⁰

4 * 2²⁰

256 * 2¹⁰

Solution:

Recall that Belady’s anomaly is that the pages-fault rate may increase as the number of allocated frames increases. Now consider the following statements:
S1: Random page replacement algorithm (where a page chosen at random is replaced) suffers from Belady’s anomaly. S2: LRU page replacement algorithm suffers from Belady’s anomaly .
Which of the following is CORRECT?

S1 is true, S2 is true

S1 is true, S2 is false

S1 is false , S2 is true

S1 is false, S2 is false

Solution:

Consider the following statements.
I. Daisy chaining is used to assign priorities in attending interrupts.
II. When a device raises a vectored interrupt, the CPU does polling to identify the source of interrupt.
III. In polling,the CPU periodically checks the status bits to know if any device needs its attention.
IV. During DMA, both the CPU and DMA controller can be bus masters at the same time.
Which of the above statements is/are TRUE ?

I and II only

I and IV only

I and III only

III only

Solution:

Consider two files systems A and B , that use contiguous allocation and linked allocation, respectively. A file of size 100 blocks is already stored in A and also in B. Now, consider inserting a new block in the middle of the file (between 50th and 51st block), whose data is already available in the memory. Assume that there are enough free blocks at the end of the file and that the file control blocks are already in memory. Let the number of disk accesses required to insert a block in the middle of the file in A and B are n_A and , n_B respectively, then the value of n_A + n_B is

Operating-systems Questions Set 15:

How many states are there in the process lifecycle management?

Solution:

For large data transfers, _____ is used.

Solution:

Which system call will cause a parent process to be suspended until its child processes terminate?

Solution:

CineBlitz multimedia server supports

Solution:

What is thrashing?

Solution:

In the context of compilers, which of the following is/are NOT an intermediate representation of the source program?

Solution:

Solution:

Solution:

Solution:

Solution:

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