Free Practice Quiz Question List

6 Memory Management and Virtual Memory Online Quiz Questions

Use this free practice quiz with 20 questions to review 6 Memory Management and Virtual Memory, test your knowledge, and prepare for your next test or exam.

20 questions

True or false

1 point

True or false: Threads belonging to the same process typically share its address space.

A
True
B
False

True or false

1 point

True or false: If a process accesses an address that violates the page’s permissions, the operating system handles it by loading the page into RAM and restarting the instruction.

A
True
B
False

Choose one

1 point

What is the main role of a translation lookaside buffer (TLB) during memory access?

A
It stores modified file contents until they are written to backing storage.
B
It caches recent virtual-to-physical address translations.
C
It divides a process’s address space into variable-sized logical regions.
D
It allocates requested blocks within a program’s runtime.

Choose one

1 point

With 4 KiB pages, virtual address 0x12345 has virtual page number 0x12 and offset 0x345. If page 0x12 maps to physical frame 0x2A, what physical address results?

A
0x12345
B
0x2A345
C
0x2A12
D
0x3452A

Choose one

1 point

A program reads from a file-backed region of its address space, but the needed file page is not currently in RAM. What is a likely result of that first access?

A
The program must first copy the file into its own buffer using physical disk addresses.
B
Every read from the mapped region causes a page fault, even after the page is in RAM.
C
The first access can cause a page fault that prompts the operating system to load the relevant file data and establish the mapping.
D
The mapping gives the program direct control over which physical disk and RAM locations hold the data.

Choose all

1 point

Select all statements that correctly describe paging.

A
Virtual address spaces are divided into fixed-size pages, and physical memory into same-sized frames.
B
Each virtual page must occupy a physically contiguous region whose size matches the entire address space.
C
A page table records which physical frame, if any, holds each virtual page.
D
Paging avoids external fragmentation in physical-memory allocation because any available frame can hold a page.
E
Paging guarantees that no space inside an allocated region is ever unused.

Choose all

1 point

Select all statements that accurately describe virtual memory and file-backed mappings.

A
A process’s address space can be larger than the portion of it currently resident in RAM.
B
Every region in a process’s address space must be backed by swap space.
C
Two processes can map the same read-only program-file pages while keeping separate private data.
D
File-backed mappings can connect a file to a process’s virtual address space.
E
Virtual memory makes disk access as fast as access to RAM.

Written response

1 point

In a simple segmentation model, a segment has base $1000$ and limit $300$ . A valid address uses offset $240$ . What physical address results? Enter a decimal number.

Fill in the blank

1 point

In paging, virtual address spaces are divided into fixed-size , while physical memory is divided into same-sized .

Fill in the blank

1 point

When a process accesses a valid page that is not resident in RAM, the operating system often , , and then .

Open ended

1 point

Describe the roles of the code, global-data, heap, and stack regions commonly found in a process’s address space. Explain how the heap and stack differ.

Choose one

1 point

A program requests memory through a runtime allocator such as malloc. Which task is most directly associated with that allocator?

A
The runtime allocator maps virtual pages to physical frames and enforces process permissions.
B
The runtime allocator manages requested blocks and may obtain larger regions from the operating system.
C
The runtime allocator translates every virtual address directly into a disk location.
D
The runtime allocator sets the physical base and limit for every process segment.

Choose one

1 point

A program accesses a virtual address in its address space. Which component performs the translation to a physical address in RAM?

A
The operating system translates physical addresses into virtual addresses before a program uses them.
B
The MMU translates a process’s virtual addresses into physical addresses.
C
The runtime allocator translates virtual addresses directly into file offsets.
D
The page table assigns each process a separate physical RAM chip.

True or false

1 point

True or false: If a process accesses an invalid address, the operating system handles the resulting page fault by loading that address’s page into RAM.

A
True
B
False

Choose one

1 point

Two processes run the same program. Which arrangement can let them share program pages without making their private data the same?

A
The processes must use identical virtual addresses for all their data.
B
The operating system copies the entire program into RAM separately for each process.
C
Both processes can map the same read-only program-file pages while keeping private data separate.
D
The processes share one address space, so neither can have private data.

Choose one

1 point

A system uses 4 KiB pages. Virtual address 0x12345 is in virtual page 0x12, which maps to physical frame 0x2A. What physical address results?

A
0x2A123
B
0x2A345
C
0x12345
D
0x3452A

Choose one

1 point

In a simple segmentation model, a process accesses a segment with a base of 8000 and a limit of 1200. Which rule determines whether an offset can be translated?

A
Translate every offset by adding it to the base, even when it exceeds the limit.
B
Use the offset as the physical address and ignore the base.
C
Add the offset to the base only when the offset is within the segment’s limit.
D
Replace the offset with a page-frame number from the TLB.

Written response

1 point

What is the term for free memory split into separate pieces that are each too small to satisfy a requested allocation?

Written response

1 point

What does TLB stand for in the context of address translation?

Written response

1 point

A variable-sized allocator gives a program a 64-byte block for a 50-byte request. How many bytes of unused space remain inside the allocated block? Enter the number in bytes.