NIMCET 2025
Dynamic RAM (DRAM) stores each bit of data in a separate capacitor. Due to leakage, the stored charge tends to dissipate over time and needs to be refreshed periodically. Consider the following statements:P: DRAM requires refreshing because it uses capacitors to store bits.Q: SRAM does not require refreshing because it uses flip-flops instead of capacitors.R: DRAM is faster than SRAM because it needs less frequent access.S: DRAM is more suitable for main memory than SRAM due to its density.Which of the following is correct?
Answer (Detailed Solution Below)View answer ▾Hide ▴
Answer: Option A — P, Q, and S are true; R is false.
Detailed Solution
P is true: capacitor charge leaks, so DRAM must be refreshed. Q is true: SRAM keeps its data in flip-flops and needs no refresh.
R is false: SRAM is faster than DRAM. S is true: DRAM cells are small and cheap, so DRAM is used for main memory.
So P, Q and S are true and R is false.
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Computer Memory & Memory Organization — Preparation
This question tests your understanding of Computer Memory & Memory Organization, a key topic in the Computer Awareness section. The detailed solution above uses a step-by-step approach to show the reasoning, and where available, a shortcut that helps you solve similar questions in under 90 seconds during the actual exam.
Computer memory stores data and instructions. This topic covers the memory hierarchy, from registers and cache memory to main memory (RAM and ROM) and secondary storage (hard disks, SSDs, optical discs and flash drives). It also covers types of RAM (SRAM and DRAM), types of ROM (PROM, EPROM and EEPROM), virtual memory, and units of memory from bits and bytes to kilobytes, megabytes, gigabytes and terabytes. Exam questions test the differences between volatile and non-volatile memory, which memory is fastest or largest, memory unit conversions, and the role of cache memory. Remember that moving up the memory hierarchy makes memory faster and costlier per bit but smaller in capacity. RAM is volatile and loses its contents when power is switched off, while ROM keeps its contents. Practise the computer memory questions below. Each answer comes with a short explanation.