Size of Virtual Memory - MCQs in CS - Williams

Question

The size of virtual memory is limited by

• A. data bus
• B. main memory
• C. address bus
• D. none of the above

Answer 1

Virtual Memory is the memory addressed by the CPU. So, obviously it is limited by the no. of "address lines" in the CPU or the size of the Memory Address Register (MAR). So, C option is correct.

Comments

@arjun Sir, It is not limited by Secondary Memory, please correct me if I am wrong.
VM can be greater/smaller than MM/SM, the address needs to fit in the address space.

Answer 2

Size of vertual memory limited by disk size.

So D. Is right.

Comments

it is address bus (MAR)

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in the key it is given as size of address bus

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yes, it is always limited by address bus, as it carries virtual address .

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That means more than bus size process is not possible! I don't think so...

Answer 3

According to me answer should be D only because in case of virtual memory when you execute a job it is not compulsory that all jobs should reside in the main memory it is an illusion to cpu that all the processes are resides in the main memory because cpu will not execute all programs at a particular time it will only execute a instruction at particular time if the corresponding instructions or data is not present in the main memory it fetches it on demand of CPU here in the case of virtual memory concept memory is divided into no of frames of equal size that's it does not depend on the data bus address bus and main memory

Answer 4

Answer sholud be D

because in the case of virtual memory concept when size of program in hard disk is greater than memory then concept of VM will come into picture and in the light explanation VM is also used to increase the degree of multiprogramming that's why it is only limited by hard disk size.

Option D