IGCSE Computer Science Concepts

Convert the binary number 1010 to denary.

• 9

• 11

• 12

• 10

Convert the hexadecimal number 2F to binary.

• 00101111

• 10101010

• 11110000

• 11010101

Explain the process of text encoding and give an example.

• Text encoding is the process of converting text into a binary format.

• Text encoding is the process of converting images into a text format.

• An example of text encoding is MP3, which is used for audio compression.

• An example of text encoding is UTF-8, which uses variable-length encoding to represent characters.

Name two sound file formats commonly used in computer science.

• WAV and MP3

• AVI and MOV

• DOCX and PDF

• JPG and PNG

What is the purpose of using PNG image file format?

• To reduce the image quality

• Lossless compression and support for transparent backgrounds

• To make the image file size larger

• To make the image file size smaller

Convert the denary number 25 to binary.

• 11001

• 10100

• 11100

• 10011

Convert the hexadecimal number 3A to binary.

• 11001011

• 00111010

• 11110000

• 10101010

Explain the concept of ASCII and its significance in text encoding.

• ASCII is a programming language used for text-based applications

• ASCII is a type of computer virus that corrupts text files

• ASCII is a form of encryption used to hide text in images

• ASCII is a character encoding standard that represents text in computers. It uses 7-bit binary code to represent characters, including letters, numbers, and symbols. It is significant in text encoding as it allows for the consistent representation of characters across different computer systems and devices.

AA character set that is 7-bits long is called

• Extended ASCII

• ASCII

• UNICODE

• UTF8

A______ is the smallest representation of an image on a screen.