Computer Knowledge

Computer Memory and Storage

2,477 Questions

Computer memory and storage questions test foundational knowledge of hardware, cache mapping, and data transfer mechanisms. Key areas include Direct Memory Access, analog recording, and RAID levels. This section is essential for candidates preparing for banking and government computer proficiency tests.

Cache memory mappingDirect memory accessRAID storage levelsHard disk technologyOptical media storageMemory addresses

Computer Memory and Storage Questions

Multiple choice technology mainframe

ASM

  1. Advanced Storage Manager

  2. Auxiliary Storage Manager

  3. Automatic Storage Manager

  4. Adaptive Sequence Manager
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

ASM stands for Auxiliary Storage Manager, which is a storage management component used in mainframe systems (specifically MVS). The other options are plausible but incorrect expansions of the acronym.

Multiple choice technology databases

What is the biggest advantage of having the control files on different disks?

  1. Database performance

  2. Guards against failure

  3. Faster archiving

  4. Writes are concurrent, so having control files on different disks speeds up control file writes
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

To answer this question, the user needs to have basic knowledge of database architecture and file systems.

The biggest advantage of having control files on different disks is to guard against failure. Option B is the correct answer.

Explanation for each option:

A. Database performance: Although disk performance can impact database performance, having control files on different disks does not necessarily improve database performance.

B. Guards against failure: When control files are located on separate disks, it provides redundancy and a safeguard against disk failure. If one disk fails, the other disk can still provide the necessary control files for the database.

C. Faster archiving: Control files are not directly related to archiving. Having control files on different disks does not necessarily speed up archiving.

D. Writes are concurrent, so having control files on different disks speeds up control file writes: While it is true that having control files on different disks can speed up control file writes, this is not the biggest advantage of having control files on different disks. The biggest advantage is the redundancy and safeguard against disk failure.

Therefore, the correct answer is:

The Answer is: B. Guards against failure.

Multiple choice technology

Typically, hard disk drives employ what technology as a storage mechanism?

  1. Laser

  2. Magnetic

  3. Light

  4. Chemical
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Hard disk drives store data using magnetic technology - they magnetically polarize microscopic areas on spinning platters to represent binary data. This magnetic storage mechanism allows for persistent, rewritable data storage. Laser technology is used in optical media like CDs/DVDs.

Multiple choice technology

Which of the below media types hold the most information?

  1. blue-ray

  2. floppy

  3. cd

  4. dvd
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Blu-ray discs have the highest capacity among these storage media - standard single-layer discs hold 25 GB, dual-layer hold 50 GB. DVDs hold 4.7-8.5 GB, CDs hold 700 MB, and floppy disks hold only 1.44 MB. The name 'Blu-ray' refers to the blue-violet laser used to read the discs, allowing for much higher data density than the red laser used for DVDs and CDs.

Multiple choice technology

NVRAM

  1. Non-Variable Random Access Memory

  2. Non-Volatile Random Access Memory

  3. Non-Volatile Randomly Access Memory

  4. None
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

NVRAM stands for Non-Volatile Random Access Memory, which retains data even when power is removed. The non-volatile property distinguishes it from regular RAM that requires continuous power.

Multiple choice technology

EEPROM

  1. Electronically Erasable Programmable Read Only Memory

  2. Erasing Electronic Programmable Read Only Memory

  3. Erasable Electrically Programmable Read Only Memory

  4. Electrically Erasable Programmable Read Only Memory
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

EEPROM stands for Electrically Erasable Programmable Read-Only Memory, which is non-volatile memory that can be erased and rewritten electrically. Unlike standard EPROM that requires UV light for erasure, EEPROM can be erased in-circuit using electrical signals, making it more convenient for field updates.

Multiple choice technology operating systems

What is the Maximum Raw Capacity in XP24000?

  1. 851TB

  2. 177TB

  3. 332TB

  4. 95TB
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

XP24000 achieves 851TB raw capacity with 1152 drives at maximum capacity (approximately 750GB-1TB per drive). This represents total physical storage before RAID configuration or virtualization overhead. Options B, C, D represent smaller configurations or partial capacities.

Multiple choice technology operating systems

What is the Maximum External storage capacity in XP24000 ?

  1. 16PB

  2. 32PB

  3. 96PB

  4. 247PB
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

XP24000 supports 247PB maximum external storage capacity through storage virtualization, pooling multiple external storage systems, and connecting large numbers of disk arrays. This includes internal capacity plus externally attached arrays managed through the XP's virtualization layer for massive consolidation.

Multiple choice technology operating systems

What is the Maximum Cache in XP24000 ?

  1. 64GB

  2. 128GB

  3. 256GB

  4. 512GB
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

XP24000 cache scales up to 512GB using battery-backed cache modules. Large cache significantly improves write performance, read cache hit rates, and overall array responsiveness for enterprise workloads with high I/O demands and large working sets.

Multiple choice technology operating systems

A filesystem metadata area contains:

  1. superblock

  2. inodes

  3. directory area

  4. all of the above
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Filesystem metadata primarily consists of inodes, which store file metadata like permissions, ownership, size, and timestamps. While the superblock and directory area are also part of filesystem structure, inodes are the core metadata objects that describe each file. The question asks specifically for the metadata area content, which is most accurately answered by "inodes".

Multiple choice technology operating systems

Which step is required before adding a new disk to a volume group?

  1. create a physical volume

  2. extend the logical volume

  3. create a filesystem

  4. extend the filesystem
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Before adding a disk to a volume group in LVM, you must first initialize it as a physical volume using pvcreate. This writes LVM metadata to the disk so LVM can recognize and manage it. Only after this can the disk be added to a volume group with vgextend.

Multiple choice technology programming languages

Which of the following gives the memory address of a pointer a?

  1. a

  2. *a

  3. &a

  4. address(a)
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

A pointer variable stores a memory address. When you declare int* a, the variable a itself holds an address. Accessing a returns that address value. Dereferencing (*a) gives the value at that address. Taking address of a (&a) gives the address where the pointer variable is stored, not the address it holds.