Memory and Storage Devices MCQs with Answers

Question #201

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What is the typical power consumption of a 3.5-inch hard disk drive?

A. About 5-10 watts

B. About 20-30 watts

C. About 1-2 watts

D. About 50 watts

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Correct Answer: Option A

Explanation:
A typical 3.5-inch HDD consumes around 5 to 10 watts during operation, while 2.5-inch drives use less (2-3 watts). SSDs consume even less.

This question belongs to: Computer Memory and Storage Devices

Question #202

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What is the function of the read/write head in a hard disk?

A. To rotate the platter

B. To store data on the platter

C. To read and write data magnetically on the platter

D. To move the actuator arm

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Correct Answer: Option C

Explanation:
The read/write head contains electromagnetic coils that read data by sensing magnetic fields and write data by changing the magnetic polarity on the platter surface.

This question belongs to: Computer Memory and Storage Devices

Question #203

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Which of the following memory types is typically used for the CPU's Level 1 (L1) cache?

A. DRAM

B. Flash

C. SDRAM

D. SRAM

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Correct Answer: Option D

Explanation:
L1 cache is built with SRAM because it is extremely fast and has low latency, matching the CPU speed, even though it is expensive and small.

This question belongs to: Computer Memory and Storage Devices

Question #204

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What is the binary prefix for 2^20 bytes?

A. Terabyte

B. Kilobyte

C. Megabyte

D. Gigabyte

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Correct Answer: Option C

Explanation:
A megabyte (MB) in binary context is 2^20 = 1,048,576 bytes. In decimal, it is 1,000,000 bytes, but in computing, binary multiples are often used for memory.

This question belongs to: Computer Memory and Storage Devices

Question #205

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Which of the following is a feature of a hybrid hard drive (SSHD)?

A. Uses only flash memory

B. Is more expensive than a pure HDD but slower than an SSD

C. Combines a small SSD with a large HDD

D. Has no moving parts

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Correct Answer: Option C

Explanation:
An SSHD (Solid State Hybrid Drive) combines a traditional HDD with a small amount of flash memory (usually NAND) to cache frequently used data, providing a balance of capacity and speed.

This question belongs to: Computer Memory and Storage Devices

Question #206

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What is the approximate data transfer rate of a typical 7200 RPM hard disk drive?

A. 100-200 MB/s

B. 500-600 MB/s

C. 50-80 MB/s

D. 1-2 GB/s

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Correct Answer: Option A

Explanation:
Modern 7200 RPM HDDs typically have sustained transfer rates in the range of 100 to 200 MB/s, depending on density and technology. SSDs are much faster.

This question belongs to: Computer Memory and Storage Devices

Question #207

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Which of the following is a type of optical disc that is recordable once?

A. CD-RW

B. CD-R

C. CD-ROM

D. DVD-RAM

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Correct Answer: Option B

Explanation:
CD-R (Recordable) can be written once and read many times. CD-RW is rewritable, and CD-ROM is read-only. DVD-RAM is a rewritable optical disc.

This question belongs to: Computer Memory and Storage Devices

Question #208

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What is the role of the Northbridge in relation to memory?

A. It manages the communication between CPU, RAM, and graphics

B. It handles I/O devices

C. It controls power management

D. It stores the BIOS

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Correct Answer: Option A

Explanation:
In traditional chipset architecture, the Northbridge connects the CPU to high-speed components like RAM and PCIe graphics. Modern CPUs often integrate the memory controller, reducing the Northbridge's role.

This question belongs to: Computer Memory and Storage Devices

Question #209

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Which memory technology is non-volatile and can be electrically erased and reprogrammed?

A. EPROM

B. PROM

C. Mask ROM

D. EEPROM

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Correct Answer: Option D

Explanation:
EEPROM (Electrically Erasable PROM) can be erased and reprogrammed using electrical signals, without the need for UV light, unlike EPROM.

This question belongs to: Computer Memory and Storage Devices

Question #210

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What is the typical data rate of a Blu-ray drive (1x speed)?

A. 36 MB/s

B. 11 MB/s

C. 7.5 MB/s

D. 4.5 MB/s

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Correct Answer: Option A

Explanation:
1x speed for Blu-ray is defined as 36 MB/s (or 36 Mbps? Actually, it's 36 Mbit/s? Wait: 1x Blu-ray is 36 Mbps (4.5 MB/s). Let's check: 1x DVD is 11.08 Mbps (1.32 MB/s), 1x CD is 150 KB/s. Blu-ray 1x is 36 Mbps = 4.5 MB/s. But common speeds are faster. Let me verify: Actually, 1x Blu-ray = 36 Mbit/s (4.5 MB/s). Some sources say 36 Mbit/s = 4.5 MB/s. So option A (4.5 MB/s) is correct. However, I've also seen 1x Blu-ray = 36 MB/s? Let's recall: Blu-ray standard defines 1x at 36 Mbps (megabits per second). So 4.5 MB/s. So correct answer is A: 4.5 MB/s.

This question belongs to: Computer Memory and Storage Devices

Question #211

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What is the primary advantage of using DDR4 over DDR3 RAM?

A. Lower data transfer rates

B. Higher data rates and lower power consumption

C. Larger physical size

D. Higher operating voltage

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Correct Answer: Option B

Explanation:
DDR4 offers higher data rates (up to 3200 MT/s and beyond) and lower operating voltage (1.2V vs 1.5V for DDR3), leading to improved performance and efficiency.

This question belongs to: Computer Memory and Storage Devices

Question #212

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Which of the following is not a valid storage capacity for a standard pen drive?

A. 8 GB

B. 120 GB

C. 32 GB

D. 16 GB

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Correct Answer: Option B

Explanation:
While pen drives come in various capacities, common sizes are powers of 2 (8, 16, 32, 64, 128, 256 GB). 120 GB is not a standard power-of-two size, though non-standard sizes might exist; typically, 120 GB is more common in SSDs, not pen drives. However, 128 GB is common. For exam, 120 GB is unusual, but I'd say it's not a standard capacity. I'll go with D as not typical.

This question belongs to: Computer Memory and Storage Devices

Question #213

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What is the main purpose of virtual memory?

A. To allow programs to use more memory than physically available

B. To reduce the cost of memory

C. To increase the physical RAM capacity

D. To speed up memory access

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Correct Answer: Option A

Explanation:
Virtual memory enables a computer to use more memory than is physically installed by swapping data between RAM and secondary storage (like a hard disk), allowing large programs to run.

This question belongs to: Computer Memory and Storage Devices

Question #214

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Which of the following is a characteristic of a magnetic disk?

A. Data is stored in pits

B. Data is stored in flash cells

C. Data is stored magnetically on a circular platter

D. Data is stored using laser

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Correct Answer: Option C

Explanation:
Hard disk drives store data magnetically on rotating platters. Optical discs use pits, and SSDs use flash cells.

This question belongs to: Computer Memory and Storage Devices

Question #215

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What does the acronym 'SDRAM' stand for?

A. Single Data Rate RAM

B. Synchronous Data RAM

C. Synchronous Dynamic Random Access Memory

D. Static Dynamic RAM

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Correct Answer: Option C

Explanation:
SDRAM stands for Synchronous Dynamic Random Access Memory, which synchronizes with the system clock for faster data transfer compared to asynchronous DRAM.

This question belongs to: Computer Memory and Storage Devices

Question #216

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Which of the following is a measure of the number of data transfers per second in RAM?

A. MHz

B. GB/s

C. MT/s

D. MB/s

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Correct Answer: Option C

Explanation:
For DDR memory, the effective data rate is often quoted in MT/s (megatransfers per second), which indicates the number of data transfers per second. MHz is clock frequency, which is half of MT/s for DDR.

This question belongs to: Computer Memory and Storage Devices

Question #217

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What is the physical medium used in a hard disk to store data?

A. Polycarbonate layer

B. Aluminum or glass platters coated with magnetic material

C. Metallic tape

D. Silicon chips

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Correct Answer: Option B

Explanation:
Hard disks use platters made of aluminum or glass, coated with a thin magnetic layer that stores data in the form of magnetized regions.

This question belongs to: Computer Memory and Storage Devices

Question #218

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Which of the following storage devices has the shortest life expectancy?

A. Optical disc

B. Hard disk

C. Magnetic tape

D. SSD

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Correct Answer: Option D

Explanation:
SSDs have a limited number of program/erase cycles, especially TLC and QLC NAND, so they may wear out faster under heavy writes compared to HDDs and other media, though modern SSDs have good endurance.

This question belongs to: Computer Memory and Storage Devices

Question #219

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What is the role of the memory controller in a CPU?

A. To decide which data to store in RAM

B. To control the power supply to memory

C. To handle memory addressing and data transfer

D. To manage the cache

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Correct Answer: Option C

Explanation:
The memory controller manages the flow of data between the CPU and main memory, handling memory addressing, command issuance, and data transfer timing.

This question belongs to: Computer Memory and Storage Devices

Question #220

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Which of the following is a type of flash memory that can be erased in blocks rather than one byte at a time?

A. NOR flash

B. NAND flash

C. EEPROM

D. EPROM

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Correct Answer: Option B

Explanation:
NAND flash memory is erased in blocks, making it suitable for high-density storage like SSDs and USB drives. NOR flash allows byte-level access but is slower for writing.

This question belongs to: Computer Memory and Storage Devices

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