Which type of memory is used as main system memory in most computers?
A. SRAM
B. DRAM
C. Flash
D. ROM
Answer: Option B
Solution (By JKSSB Mock Tests)
DRAM (Dynamic RAM) is commonly used as the main memory (system RAM) in computers due to its higher density and lower cost compared to SRAM, although it requires periodic refreshing.
Explanation:
The Instruction Register (IR) is the dedicated high-speed storage location inside the CPU control unit that holds the binary instruction currently undergoing decoding and execution.
Explanation:
DRAM (Dynamic RAM) uses capacitors to store bits; they leak charge and must be refreshed periodically. SRAM uses flip-flops and does not need refreshing.
Explanation:
Platters in a hard disk rotate at a constant speed (e.g., 7200 RPM). They are made of aluminum/glass with magnetic coating, not silicon, and are used in HDDs, not SSDs.
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