1. RAID stands for:
- Random Access Integrated Drive
- Redundant Array of Independent Disks
- Rapid Array of Internal Data
- Read And Insert Data
Answer: B) Redundant Array of Independent Disks
Explanation: Originally "Inexpensive" disks.
MCQs / Computer Science / Storage Units and Memory
Storage Units and Memory MCQs — Computer Science
51 multiple-choice questions on Storage Units and Memory from Computer Science, each with the correct answer and, where available, a teacher's explanation. Read through them to revise the chapter, then practise the same questions one by one to test yourself.
2. Which RAID level gives the best speed but no fault tolerance?
- RAID 6
- RAID 0
- RAID 5
- RAID 1
Answer: B) RAID 0
Explanation: If one disk fails in RAID 0, all data is lost.
3. The same track on all platters together forms a:
- cluster
- cylinder
- sector
- head
Answer: B) cylinder
Explanation: Cylinder = all tracks at one arm position.
4. 1 petabyte is equal to:
- 1000 MB
- 1024 TB
- 1024 EB
- 1024 GB
Answer: B) 1024 TB
Explanation: PB comes after TB.
5. RAID 5 needs at least:
- 8 disks
- 1 disk
- 2 disks
- 3 disks
Answer: D) 3 disks
Explanation: Striping with distributed parity needs three or more disks.
6. Blu-ray discs use a:
- infrared laser only
- red laser
- magnetic head
- blue-violet laser
Answer: D) blue-violet laser
Explanation: Shorter wavelength allows more data (25 GB per layer).
7. Flash memory is a type of:
- DRAM
- SRAM
- EEPROM
- PROM only
Answer: C) EEPROM
Explanation: Flash memory is electrically erasable.
8. Cache memory is placed between:
- the hard disk and printer
- the keyboard and CPU
- the CPU and main memory
- RAM and the monitor
Answer: C) the CPU and main memory
Explanation: It speeds up CPU access to frequently used data.
9. EPROM can be erased by:
- electricity byte by byte
- heat from a laser printer
- a magnet
- ultraviolet light
Answer: D) ultraviolet light
Explanation: EPROM chips have a quartz window for UV erasing.
10. Hard disk speed is measured in:
- Hz only
- dpi
- RPM
- ppm
Answer: C) RPM
Explanation: Revolutions per minute, e.g. 7200 RPM.
11. A single-layer DVD stores about:
- 4.7 GB
- 700 MB
- 100 GB
- 25 GB
Answer: A) 4.7 GB
Explanation: Single-layer DVD = 4.7 GB.
12. Google Drive and OneDrive are examples of:
- optical storage
- ROM
- cloud storage
- RAM
Answer: C) cloud storage
Explanation: Files are stored on Internet servers.
13. 1 KB is equal to:
- 100 bytes
- 1024 bytes
- 1000 bits
- 1024 bits
Answer: B) 1024 bytes
Explanation: 1 KB = 2¹⁰ bytes.
14. SD and microSD are types of:
- RAID levels
- optical discs
- printers
- memory cards
Answer: D) memory cards
Explanation: Used in phones and cameras.
15. A dedicated high-speed network of storage devices used by servers is a:
- SAN
- CAN
- LAN only
- PAN
Answer: A) SAN
Explanation: SAN = Storage Area Network.
16. SSDs are faster than HDDs mainly because they:
- use magnetic tape
- spin faster
- have no moving parts
- use lasers
Answer: C) have no moving parts
Explanation: SSDs use flash memory chips.
17. The smallest unit of data in a computer is a:
- byte
- kilobyte
- bit
- nibble
Answer: C) bit
Explanation: A bit is a single 0 or 1.
18. A pie-shaped division of a track is called a:
- cylinder
- platter
- sector
- spindle
Answer: C) sector
Explanation: Sectors traditionally hold 512 bytes.
19. The main memory of a modern PC is usually:
- SRAM
- DRAM (DDR SDRAM)
- PROM
- CD-ROM
Answer: B) DRAM (DDR SDRAM)
Explanation: DDR4/DDR5 SDRAM is used as main memory.
20. Which is the largest unit?
- Megabyte
- Kilobyte
- Gigabyte
- Terabyte
Answer: D) Terabyte
Explanation: TB GB MB KB.
21. One byte equals:
- 1024 bits
- 4 bits
- 16 bits
- 8 bits
Answer: D) 8 bits
Explanation: A byte is a group of 8 bits.
22. A device that reads and writes memory cards is a:
- barcode reader
- MICR
- plotter
- card reader
Answer: D) card reader
Explanation: Card readers may be built-in or USB.
23. A main disadvantage of cloud storage is that it:
- is volatile like RAM
- is only available on one computer
- needs an Internet connection
- cannot be shared
Answer: C) needs an Internet connection
Explanation: Without Internet, cloud files cannot be reached (unless synced).
24. CD-RW means the disc is:
- write once
- rewritable
- a hard disk
- read only
Answer: B) rewritable
Explanation: RW discs can be erased and rewritten.
25. RAM stands for:
- Read Access Memory
- Rapid Action Memory
- Random Allocated Module
- Random Access Memory
Answer: D) Random Access Memory
Explanation: Any location in RAM can be accessed directly.
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