Memory types and their properties

There are several types of memory used in computer systems, each with its own unique properties. The following are the most common types of memory:

- RAM (Random Access Memory): This type of memory is used by the computer to store data and programs that are currently in use. RAM is volatile, which means that its contents are lost when the computer is turned off or restarted.
- ROM (Read-Only Memory): This type of memory is used to store data that is essential for the operation of the computer, such as the BIOS (Basic Input/Output System). The contents of ROM cannot be changed.
- PROM (Programmable Read-Only Memory): This type of memory is similar to ROM, but it can be programmed once by the user.
- EPROM (Erasable Programmable Read-Only Memory): This type of memory can be programmed and erased multiple times using ultraviolet light.
- EEPROM (Electrically Erasable Programmable Read-Only Memory): This type of memory can be programmed and erased electronically.

Answer explanation

The correct answer to the given question is option 'B', PROM (Programmable Read-Only Memory). PROM is a type of memory that can be programmed once by the user, but cannot be changed afterwards. Once the program or data is written to PROM, it remains there permanently. This makes PROM ideal for applications where the data or program needs to be stored permanently and cannot be changed, such as in electronic devices that require firmware.

RAM, EPROM, and EEPROM are not the correct answers to the question, as they all allow data to be changed or erased. RAM is volatile, which means its contents are lost when the computer is turned off or restarted. EPROM and EEPROM can be reprogrammed and erased multiple times.

Conclusion

In conclusion, PROM is a type of memory that is used to store data or programs permanently and cannot be changed afterwards. The other types of memory, such as RAM, EPROM, and EEPROM, allow data to be changed or erased.