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.

Advantages

  • 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.

 

Disadvantages

  • 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.

Posted by:

Ashwani TyagiAshwani TyagiMember since Jun 2020
UGC NET Qualified 3 times (history)
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Comments

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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 student..so 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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