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Computer MCQS

Sciences MCQS

1.
Memory tables are used to keep track of

Real and Virtual Memory

I/O Devices

Resources

I/O Modules

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2.
Virtual Memory is commonly implemented by __________.

Segmentation

Swapping

Demand Paging

None of the above

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3.
Virtual memory is __________.

An extremely large main memory

An extremely large secondary memory

An illusion of extremely large main memory

A type of memory used in super computers

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4.
_________ is a high speed cache used to hold recently referenced page table entries a part of paged virtual memory .

Translation Lookaside buffer

Inverse page table

Segmented page table

All the above

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5.
The high paging activity is called ________.

Inter process communication

Thrashing

Context Switch

None of the above

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6.
Virtual memory is __________.

An extremely large main memory

An extremely large secondary memory

An illusion of extremely large main memory

A type of memory used in super computers

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7.
The principle of locality of reference justifies the use of ________.

Virtual Memory

Interrupts

Main memory

Cache memory

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8.
In a virtual memory environment

Segmentation and page tables are stored in the cache and do not add any substantial overhead

Slow down the computer system considerable

Segmentation and page tables are stored in the RAM

None of the above

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9.
The mechanism that bring a page into memory only when it is needed is called _____________

Segmentation

Fragmentation

Demand Paging

Page Replacement

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10.
Demand paged memory allocation

Allows the virtual address space to be independent of the physical memory

Allows the virtual address space to be a multiple of the physical memory size

Allows deadlock tobe detected in paging schemes

Is present only in Windows NT

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11.
What is a page fault ?

Is an spelling error in a page in memory

Is a reference to a page which is in another program

Is an access to a page not currently in memory

Always occurs whenever a page is accessed

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12.
Dirty bit is used to show

Page with corrupted data

Wrong page in memory

Page that is modified after being loaded in the cache memory

Page that is less frequently accessed

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13.
Size of virtual memory depends on

Size of data bus

Size of address bus

Size of main memory

None of above

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14.
A program is executing in a pure demand paging system with 100 records per page with 1 free main memory frame. The address sequence that is generated by tracing this program is recorded as follows,0100, 0200, 0430, 0499, 0510, 0530, 0560, 0120, 0220, 0240, 0260, 0320, 0370What are the number of page faults?

8

11

7

12

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15.
If hardware does not support _________ then a multi – user and multi – processing operating system cannot be implemented.

At least two modes of CPU execution

Demand paging

DMA for disk transfer

Address translation

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