What does 'DDR' stand for in DDR RAM? MCQ with Answer and Explanation

What does 'DDR' stand for in DDR RAM?
A. Digital Data Register
B. Dual Data Routing
C. Dynamic Data Refresh
D. Double Data Rate
Answer: Option D
Solution (By JKSSB Mock Tests)
DDR stands for Double Data Rate, meaning the memory transfers data on both the rising and falling edges of the clock signal, effectively doubling the data rate.

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Practice More Memory and Storage Devices Questions

Question #1
Which storage allocation unit represents the equivalent value of exactly $2^{50}$ bytes?
A. 1 Exabyte
B. 1 Petabyte
C. 1 Zettabyte
D. 1 Terabyte

Correct Answer: Option B


Explanation:
Following binary exponential calculations: $2^{10}$ = KB, $2^{20}$ = MB, $2^{30}$ = GB, $2^{40}$ = TB, and $2^{50}$ = 1 Petabyte (PB).

This question belongs to: Computer Memory and Storage Devices
Question #2
What is the typical speed of a Blu-ray drive at 6x?
A. 216 MB/s
B. 27 MB/s
C. 33 MB/s
D. 72 MB/s

Correct Answer: Option B


Explanation:
1x Blu-ray = 4.5 MB/s (36 Mbps). 6x = 6 * 4.5 = 27 MB/s.

This question belongs to: Computer Memory and Storage Devices
Question #3
What does the term 'memory latency' refer to?
A. The amount of data transferred per second
B. The time to refresh memory
C. The delay between issuing a request and getting the data
D. The time to transfer data from memory to CPU

Correct Answer: Option C


Explanation:
Memory latency is the time delay from when a memory access request is issued to when the data is available. It includes various delays like address decoding, access time, and bus latency.

This question belongs to: Computer Memory and Storage Devices