The two kinds of main memory are?

Appeared in: PGIMS Rohtak NO - 2017

Explanation

Main memory, or primary memory, is the component that stores data and programs currently being used by the CPU.
The two fundamental types of main memory are RAM (Random-Access Memory) and ROM (Read-Only Memory).
RAM is volatile memory used for active tasks, holding the operating system, running applications, and current data.
ROM is non-volatile memory that holds essential startup instructions (firmware/BIOS) for the computer.

Option A: This describes the memory hierarchy. Main memory is synonymous with primary memory. Secondary memory (e.g., SSD, HDD) is for long-term storage, not a type of main memory.
Option B: These are memory access methods, not types of memory. Random access allows any data to be accessed directly, while sequential access requires reading data in order.
Option D: This option is incorrect because options A and B are incorrect classifications of main memory.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Types of Main Memory in Computer Systems as background academic context rather than a clinical decision trigger.
In nursing informatics, understanding computer hardware basics is crucial for troubleshooting and system evaluation.
A computer's amount of RAM directly impacts the performance of clinical applications. More RAM allows a nurse to run an Electronic Health Record (EHR), a Picture Archiving and Communication System (PACS), and a drug database simultaneously without slowdowns.
ROM contains the computer's basic input/output system (BIOS), which is essential for the computer to start up and load the operating system, but it does not affect the day-to-day speed of applications.

How to Approach the Question

This is a factual recall question from the subject of computers/informatics.
First, identify the key term in the question: 'main memory'. Recall its definition as the primary, volatile workspace for the computer.
Evaluate each option against this definition.
Option A ('Primary and secondary') describes a hierarchy, not two types of main memory. Eliminate it.
Option B ('Random and sequential') describes access methods, not memory types. Eliminate it.
Option C ('ROM and RAM') lists the two established types of main memory. This is the correct choice.

Concept Tested & Keywords

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Practise the full PGIMS Rohtak NO - 2017

Attempt every question from this paper in a timed mock, then review the full solution for each one.