S3 CS - Data representation

How many bits of storage are used to represent a single character in ASCII?

• 16

• 4

• 8

• 1

Answer explanation

The ASCII character encoding uses a single byte or 8 bits to represent each character.

How many bits of storage would be required to store the phrase below with ASCII?

Fergus Fox

• 9

• 10

• 70

• 80

Answer explanation

The phrase 'Fergus Fox' contains 10 characters, including the space. Since each ASCII character requires 8 bits of storage, the total storage required would be 10 characters x 8 bits = 80 bits. So, the correct answer is 80.

Match the description below with the correct term.

The total number of pixels in a set area.

• Bitmap

• Resolution

• Colour depth

• Pixel

Answer explanation

The question asks about the term used for the total number of pixels in a set area. The correct term is 'Resolution'. The term 'Resolution' refers to the total number of pixels that can be displayed in a digital image or on a digital display device. Therefore, the correct answer is Resolution.

Match the description below with the correct term.

The smallest element of a bitmap graphic.

• Bitmap

• Resolution

• Colour depth

• Pixel

Answer explanation

The question asks for the smallest element of a bitmap graphic. The correct term for this is 'Pixel'. A pixel is the elementary unit of bitmap graphics. It is the smallest addressable element in a display device.

Match the description below with the correct term.

The numbers of bits allocated to store the colour information of a pixel in a bitmap graphic.

• Bitmap

• Resolution

• Colour depth

• Pixel

Answer explanation

The correct term is 'Colour depth'. The question describes the number of bits used to store colour information for a single pixel in a bitmap graphic. The higher the colour depth, the more colours can be stored but the file size increases.

Match the description below with the correct term.

A type of graphic which is stored as a 2D array of pixels.

• Bitmap

• Resolution

• Colour depth

• Pixel

Answer explanation

Bitmap graphics are made of pixels in a grid. Each pixel is assigned a specific location and colour value. The correct answer is therefore bitmap.

which of the following binary numbers represents the number 15?

• 00001110

• 00001111

• 11111000

• 1111111

Answer explanation

Type something

Which of the following denary numbers matches the binary number 10000101?

• 133

• 134

• 130

• 128

Answer explanation

Type something