class 4

Here are simple answers for Class 3 students:

1. Compare various storage devices (in terms of capacity)

Different storage devices can store different amounts of data:

  • Pen Drive (USB) – Stores small to medium data (like photos, files)

  • CD/DVD – Stores less data than pen drive

  • Hard Disk (HDD) – Stores large amount of data (movies, software)

  • Memory Card – Small in size but can store good amount of data

👉 Conclusion:
Hard Disk > Pen Drive > CD/DVD (in capacity)

2. Describe data storage unit with example

A data storage unit tells us the size of data in a computer.

Data is stored in units:

  • Bit – Smallest unit (0 or 1)

  • Byte – 8 bits

  • Kilobyte (KB) – 1024 bytes

  • Megabyte (MB) – 1024 KB

  • Gigabyte (GB) – 1024 MB

👉 Example:
A photo = few MB
A movie = few GB

3. Difference between Primary and Secondary Memory

Primary MemorySecondary Memory
Temporary storagePermanent storage
FastSlower
Used by CPU directlyNot directly used by CPU
Example: RAMExample: Hard Disk, Pen Drive


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