Study Notes on Memory (ICT) for Paper-1

By Ashwani Tyagi|Updated : August 24th, 2021


Memories are the most important topic of ICT in Paper-1. In every shift of the recent exam, NTA asked questions from this section. So prepare thoroughly this part.

  • A memory is just like the brain of a human.
  • It stores data and instructions.
  • Memory in a computer is the storage space in the computer where data and instructions are processed and given respectively.
  • Small parts of memory are cells.
  • Each location or cell has a unique address.

There are three types of Memory

  • Cache Memory
  • Primary Memory/Main Memory
  • Secondary Memory

1. Cache Memory

  • It is a high-speed semiconductor memory that speeds up the CPU. 
  • Between CPU and main memory, it acts as a buffer.
  • Most frequently used data and program by CPU are held by cache memory.
  • The parts of programs and data are transferred from disk to cache memory by the OS (Operating system), from where CPU (central processing unit) can access them.


  • It is fast than main memory.
  • As compared to main memory it consumes less access time.
  • Cache memory is mainly used to store a program that is to b executed in a short period of time.
  • Data is stored temporarily in it.



  • Its memory holding capacity is limited.
  • It is expensive than other memory.

2. Primary Memory (Main Memory)

  • It holds only those instructions and data on which running computer is currently working.
  • Due to its limited capacity when the power is switched off data is lost.
  • Semiconductor devices are used to make up.
  • Primary memories are not as fast as registers.
  • All the instructions and data required to be processed resides in the main memory i.e primary memory.
  • Primary memory can be divided into two subcategories: RAM and ROM

Characteristics of Main Memory

  • These are called as semiconductor memories.
  • It is called as the main memory.
  • It is volatile memory.
  • As the power is switched off data is lost.
  • It is the working memory of the computer.
  • It is fast than secondary memory.
  • A computer cannot function without primary memory.

3. Secondary Memory

  • This memory is also called as external memory.
  • It is non-volatile.
  • Secondary memory is slower than the primary memory.
  • It is used for storing information and data permanently.
  • CPU doesn't access these memories directly, instead, they are accessed via input-output routines.
  • The contents of secondary memories are first transferred to the main memory, and then the CPU can access it. 
  • For example- DVD, CD-ROM, disk, etc.

Characteristics of Secondary Memory

  • These are optical and magnetic memories.
  • It is called as the backup memory.
  • It is a non-volatile memory.
  • It is used for storing data in a computer.
  • A computer can function without secondary memory.
  • It is slower than the primary memories.
  • Even if the power is switched off data is permanently stored.

We hope you all understood about the memories in ICT for UGC NET Exam.

Thank you, Team gradeup.

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Ashwani TyagiAshwani TyagiMember since Jun 2020
UGC NET Qualified 3 times (history)
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Pooja Gaharwar
Sir plz hindi me de dijiye notes
Tony Tomer

Tony TomerApr 10, 2021

Thank you so much sir
Shiv Kumar

Shiv KumarApr 10, 2021

Thank you sir 🙏
Arati Vitthal Patil
I am chemistry i want preaparation for 2nd paper  but i am not getting it
Naima Afzal

Naima AfzalApr 10, 2021

Thanks sir
Hema Roy

Hema RoyApr 10, 2021

Pls send in english
S Sai

S SaiAug 25, 2021

Thanks sir ji

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