ICT Lecture 3: Units of Memory

ICT Lecture 3: Units of Memory

Bit

A 'bit' (short for Binary Digit) is the smallest unit of data that can be stored by a computer. Each 'bit' is represented as a binary number, either 1 or 0.

Byte

A 'byte' is combination of 8 bits, so for example, it could be stored as 10111001.

A single keyboard character that you type, such as the letter A or the letter B, takes up one byte of memory.

Nibble

The group of four bits is known as nibble. Therefore, two nibbles make a byte.

Symbol	Unit	Size
1 bit	Bit	0 or 1
1 B	Byte	8 bits
1 KB	Kilobyte	1024 bytes or 210 bits
1 MB	Megabyte	1024 KB or 220 bits
1 GB	Gigabyte	1024 MB or 230 bits
1 TB	Terabyte	1024 GB or 240 bits
1 PB	Petabyte	1024 TB or 250 bits

1. Put the following units of storage into the correct order, starting with the smallest unit first and going down to the largest unit: (July 2018)

(a) Kilobyte                            (b) Byte                                  (c) Megabyte                               

(d) Terabyte                           (e) Gigabyte                          (f) Bit

 Give your answer from the following code:

(1) (f), (b), (a), (d), (e), (c)

 (2) (f), (b), (a), (c), (e), (d)

(3) (f), (b), (a), (d), (c), (e)

(4) (f), (b), (a), (c), (d), (e)

Answer: Option (2) is correct

2. Which of the following represents billion characters? (Nov 2017)

(1) Megabytes

(2) Kilobytes

(3) Gigabytes

(4) Terabytes

Answer: Option (C) is correct

3. If one GigaByte is equal to 2^30 Bytes of data storage, then 1024 TeraBytes is equal to _____ bits of data storage. (Aug 2016)

 (1) 2^50 (2) 2^53 (3) 2^40 (4) 2^56 

Answer:  Option (1) is correct

Description:

1 TB=2^40

1024 B= 2^10

Thus, 1024 TB= 2^50

 4. In a Computer a byte generally consists of: (Dec 2015)

(A) 4 bits            (B) 8 bits

(C) 16 bits          (D) 10 bits

Answer: Option (B) is correct

5.  Which of the following represents one billion characters? (June 2015)

(A) Terabyte      (B) Kilobyte

(C) Megabyte    (D) Gigabyte

Answer: Option (D) is correct

6. A Gigabyte is equal to (June 2013)

(A) 1024 Megabytes

(B) 1024 Kilobytes

(C) 1024 Terabytes

(D) 1024 Bytes

Answer: Option (A) is correct

7. Which is the largest unit of storage among the following? (June 2009)

(A) Terabyte

(B) Megabyte

(C) Kilobyte

(D) Gigabyte

Answer: Option (A) is correct

8. bit stands for (June 2009)

(A) binary information term

(B) binary digit

(C) binary tree

(D) Bivariate Theory

Answer: Option (B) is correct