WBJECA 2025 — Computer PYQ

In computer architecture, memory is categorized based on its volatility—that is, its ability to retain stored information when power is removed.

• Volatile Memory: This memory requires a continuous power supply to maintain the stored information. If the power is turned off, the data is lost. Examples include RAM, Cache, and CPU Registers.

• Non-Volatile Memory: This memory retains its stored information even after the power is turned off. Examples include ROM, EPROM, EEPROM, and Flash memory.

We can categorize the memory types based on volatility:

$$\text{Volatile}=\{\text{RAM, Cache, Registers}\}$$

$$\text{Non-Volatile}=\{\text{EPROM, ROM, Flash}\}$$

• EPROM (Erasable Programmable Read-Only Memory): As a type of ROM, it is designed to store data permanently until it is explicitly erased (usually via ultraviolet light) and reprogrammed.

Therefore, because RAM, Cache, and Registers are volatile, EPROM is the only correct choice among the provided options.