A Level Computer Science OCR Practice Exam

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What primarily distinguishes RAM from other storage types?

It is non-volatile and retains data when powered off
It is volatile and does not retain data when powered off
It provides long-term data storage solutions
It is primarily used for output processing

The correct answer is: It is volatile and does not retain data when powered off

RAM is primarily distinguished from other storage types by its volatile nature, meaning that it does not retain data once the power is turned off. This characteristic is fundamental to RAM's function within a computer system. It is designed to provide quick access to data that the CPU needs to perform tasks actively. When the power is cut, all data in RAM is lost, which is a key factor in how it differs from non-volatile storage types like hard drives or solid-state drives, which retain data even when the device is powered down. Understanding RAM's volatility helps clarify its role in computing, where it is used for temporary storage of data and instructions that are currently being processed, rather than serving as a long-term data storage solution. This distinction is critical when considering the architecture and function of computer systems.