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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 is equal 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 (3) the correct option.
1. Which one of these is not a secondary storage device?
a. RAM b. DVD c. Pen drive
2. .................... equals 1024 PB.
a. 1 MB b. 1 EB c. 1 TB
3. Which one of these is used to measure the memory of a computer?
a. Litre b. Byte c. Inches
4. Which of these is the main storage device for a computer and is located inside the
system?
a. Hard disk b. Pen drive c. DVD
B. Fill in the blanks using the words given below.
Read Only Memory, USB, Random Access Memory, GB
1. ......................... is the full form of RAM.
2. ......................... is the full form of ROM.
Computer Memory 15

