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Chapter Profile
MEASURING THE COMPUTER’S MEMORY
The basic unit for measuring the memory of a computer is byte. A
byte consists of a group of
eight bits, for example, 10001011, i.e., 1 byte equals to 8 bits. A group of 4 bits is known as
a nibble (half byte), for example, 1001. Other units for measuring the computer’s memory
are kilobyte, megabyte, gigabyte, terabyte, etc.
1 Kilobyte (KB) equals 1024 bytes. 1 Megabyte (MB) equals 1024 KB.
1 Gigabyte (GB) equals 1024 MB. 1 Terabyte (TB) equals 1024 GB.
1 Petabyte (PB) equals 1024 TB. 1 Exabyte (EB) equals 1024 PB.
1 Zettabyte (ZB) equals 1024 EB. 1 Yottabyte (YB) equals 1024 ZB.
Recap
RAM and ROM are the types of primary memory.
The data and instructions that are entered into the computer using input devices
are stored inside the memory.
The basic unit for measuring the memory of a computer is byte.
Exercise
A. Tick ( ) the correct option.
1. Which of the following is an example of primary memory?
a. Hard Disk b. CD
c. RAM d. Pen Drive
2. What type of memory holds data even after the computer is switched off?
a. RAM b. ROM
c. Flash Drive d. None of these
3. A group of 4 bits is known as .
a. Byte b. Nibble
c. Kilobyte d. Megabyte
Computer Memory 15

