Difference Between RAM and ROM: Easy Notes - JKSSB Mock Test
Understanding the difference between RAM (Random Access Memory) and ROM (Read Only Memory) is essential for JKSSB Computer Awareness preparation. This topic is frequently asked in exams in both objective and descriptive formats. In this article, we explain everything about RAM vs ROM with examples, tables, FAQs, and expected questions.
What is RAM?
RAM (Random Access Memory) is the main memory of a computer that stores data temporarily. It is fast and volatile, meaning it loses data when power is turned off.
- Type: Volatile Memory
- Speed: Very Fast
- Used For: Running programs, multitasking
- Example: DDR4 RAM, DDR5 RAM
What is ROM?
ROM (Read Only Memory) is non-volatile memory that stores data permanently. It contains instructions required to start a computer, such as BIOS.
- Type: Non-Volatile Memory
- Speed: Slower than RAM
- Used For: Boot process, firmware
- Example: PROM, EPROM, EEPROM
Key Differences Between RAM and ROM
| Feature | RAM | ROM |
|---|---|---|
| Full Form | Random Access Memory | Read Only Memory |
| Volatility | Volatile (data lost on power off) | Non-Volatile (data remains) |
| Usage | Stores temporary data | Stores permanent data |
| Speed | Very fast | Slower |
| Size | Large (4GB, 8GB, 16GB) | Small (512KB to 4MB) |
| Modification | Data can be changed | Data is fixed or hard to change |
| Examples | DDR4, DDR5 | BIOS, Firmware |
Types of RAM
- SRAM (Static RAM): Used in cache memory, expensive but fast
- DRAM (Dynamic RAM): Used in main system memory, slower but cheaper
Types of ROM
- PROM: Programmable Read-Only Memory
- EPROM: Erasable PROM, can be rewritten using UV light
- EEPROM: Electrically Erasable PROM, rewrite using electric signal
Simple Examples to Remember
- RAM: Like your brain’s short-term memory. Once power is off, everything is lost.
- ROM: Like long-term memory. Even if you sleep (power off), you still remember important info (like name, birthdate).
Why This Topic Is Important in JKSSB
- Direct 1-mark questions asked in CBTs
- Can be part of reasoning questions (e.g., “Which of the following is volatile memory?”)
- Important in hardware-based practical understanding
One-Liner MCQ-Style Facts
- RAM is: Temporary and volatile
- ROM is: Permanent and non-volatile
- RAM speed: High
- ROM speed: Low
- SRAM is used in: Cache
- BIOS is stored in: ROM
- Data in RAM is lost when: Power is off
Frequently Asked Questions (FAQs)
Q1. What is the main difference between RAM and ROM?
RAM is temporary and fast memory, used while programs are running. ROM is permanent and stores essential startup instructions.
Q2. Which is faster: RAM or ROM?
RAM is much faster than ROM.
Q3. Is ROM editable?
Generally no, but some types like EEPROM can be modified.
Q4. What is the full form of ROM?
Read Only Memory
Q5. Where is BIOS stored?
BIOS is stored in ROM.
Conclusion
Understanding RAM vs ROM is fundamental for anyone preparing for JKSSB Computer Awareness. These two types of memory work together to help a computer run efficiently. RAM handles live tasks, while ROM ensures the computer starts properly. Learn the types, uses, and differences carefully, and revise with the table and MCQs provided.
