Important que to improve concept for UGC-NET

Collecting questions to improve my question bank 

answers taken from website getgyan.com

Question 1 :

The register or main memory location wahich contains the effective address of the operand is known as:

Option A: Pointer.

Option B: Indexed Register.

Option C: Special Location.

Option D: Scratch Pad.

Correct Answer: A

Question 2 :

Page stealing is:

Option A: A sign of an efficient system.

Option B: Taking page frames from other working sets.

Option C: Should be the tunning goal.

Option D: Taking larger disk spaces for pages paged out.

Correct Answer: B

Question 3 :

Which of the following refers to the associative memory ?

Option A: The adress of data is generated by the CPU.

Option B: The address of data is supplied by the users.

Option C: There is no need for an address i.e. the data is used as an address.

Option D: The data are accessed sequentially.

Correct Answer: C

Question 4 :

Virtual memory -

A) is a method of memory allocation by which the program is subdevided into equal portions, or pages and core is subdevided into equal portions or blocks.
B) consists of those adedresses that may be generated by a processor during execution of a computation. 
C) is a method of allocating processor time.
D) allows multiple programs to reside in seperate areas of core at the time.

Option A: A

Option B: B

Option C: C

Option D: D

Correct Answer: B

Question 5 :

The Memory Buffer Register (MBR) -

A) is a hardware memory device which denotes the location of the current instruction being executed.
B) is a group of electrical circuits (hardware) , that performs the intent of instruction fetched from memory.
C) contains the address of the memory location that is to be read from or stored into.
D) contains a copy of the designated memory location specified by the MAR after a "read" or the new contents of the memory prior to a "write".

Option A: A

Option B: B

Option C: C

Option D: D

Correct Answer: D

Question 6 :

The instruction register -

A) is hardware memory device which denotes the location of the current instruction being executed.
B) is a group of electrical circuits (hardware) , that performs the intent of instruction fetched from memory.
C) contains the address of the memory location that is to be read from or stored into.
D) contains a copy of the designated memory location specified by the MAR after a "read" or the new contents of the memory prior to a "write".

Option A: A

Option B: B

Option C: C

Option D: D

Correct Answer: B

Question 7 :

Thrashing -

Option A: is a natural consequence of virtual memory systems.

Option B: can always be avoided by swapping.

Option C: always occurs on large computers.

Option D: can be caused by poor paging algorithms.

Correct Answer: D

Question 8 :

Tharshing can be avoided if -

Option A: the pages , belonging to the working set of the programs, are in main memory.

Option B: the speed of CPU is increased.

Option C: the speed of I/O processor is increased.

Option D: All of the above.

Correct Answer: A

Question 9 :

The memory allocation scheme subject to "external" fragmentation is -

Option A: Segmentaion.

Option B: Swapping.

Option C: Pure Demand Paging.

Option D: Multiple contiguous fixed partitions.

Correct Answer: A

Question 10 :

If the number of bits in a virtual address of a program is 12 and the page size is 0.5K bytes, the number of pages in the virtual address space is -

Option A: 16

Option B: 32

Option C: 64

Option D: 128

Correct Answer: D

Question 11 :

Which of the following is not true about Memory Management ?

Option A: Virtual memory is used only in multi - user systems.

Option B: Segmetation suffers from external fragmentation.

Option C: Paging suffers from internal fragmentation.

Option D: Segmented memory can be paged.

Correct Answer: A

Question 12 :

In Virtual Memory Systems, Dynamic Address Translation -

Option A: is te hardware necessary to implement paging.

Option B: stores pages at a specific location on disk.

Option C: is useless wahen swapping is used.

Option D: is part of the operating system paging algorithm.

Correct Answer: A

Question 13 :

Seeks analysis -

Option A: is used for analyzing paging problems.

Option B: is used for analyzing device busy problems.

Option C: is used for analyzing control - unit busy problems

Option D: is only shown on real - time displays.

Correct Answer: B

Question 14 :

Swapping -

Option A: works best with many small partitions.

Option B: allows many programs to use memory simultaneously.

Option C: allows each program in turn to use the memory.

Option D: does not work with overlaying.

Correct Answer: C

Question 15 :

Which of the following statement is true ?

Option A: The LRU algorithm pages out pages that have been used recently.

Option B: Thrashing is a natural consequences of virtual memory systems.

Option C: Seek analusis is used for analysing control - unit busy problems.

Option D: All of the above.

Correct Answer: C

Question 16 :

The LRU algorithm ?

Option A: Pages out pages that have been used recently.

Option B: Pages out pages that have not been used recently.

Option C: Pages out pages that have been last used recently.

Option D: Pages out the first page in a given area.

Correct Answer: C

Question 17 :

Paging -

A) is a method of memory allocation by which the program is subdevided into equal portions, or pages and core is subdevided into equal portions or blocks.
B) consists of those addresses that may generated by a processor during execution of a computation.
C) is mwthod of allocating processor time.
D) allows multiple programs to reside in seperate areas of core at the time.

Option A: A

Option B: B

Option C: C

Option D: D

Correct Answer: A

Question 18 :

The Memory Address Register ( MAR ) -

A) is a hardware memory device which denotes the location of the current instruction being executed.
B) is a group of electrical circuits (hardware) , that performs the intent of instruction fetched from memory.
C) contains the address of the memory location that is to be read from or stored into.
D) contains a copy of the designated memory location specified by the MAR after a "read" or the new contents of the memory prior to a "write".

Option A: A

Option B: B

Option C: C

Option D: D

Correct Answer: C

Question 19 :

Memory -

A) is device that performs a sequence of operations specified by instructions in memory.
B) is the device where information is stored.
C) is a sequence of instructions.
D) is typically charaterized by intractive processing and time slicing of the CPU's time to allow quick response to each user.

Option A: A

Option B: B

Option C: C

Option D: D

Correct Answer: B

Question 20 :

Information in a memory that is no longer valid or wanted is known as -

Option A: Non - Volatile.

Option B: Volatile.

Option C: Surplus.

Option D: Grabage.

Correct Answer: D