Pearson 1CP2 - 2.3 - Units of storage and Compression

How many bytes are in 1 Kibibyte?

• 512
• 1000
• 1024
• 2048

How many kibibytes are in a mebibyte?

• 2048
• 512
• 1024
• 1000

Explain the difference between a kilobyte and a kibibyte.

• A kilobyte is a unit of storage capacity, while a kibibyte is a unit of data transfer speed.
• A kilobyte is equal to 1024 bytes, while a kibibyte is equal to 1000 bytes.
• A kilobyte is equal to 1000 bytes, while a kibibyte is equal to 1024 bytes.
• A kilobyte is used for measuring computer memory, while a kibibyte is used for measuring internet bandwidth.

Explain what is meant by data capacity.

• The amount of data that can be stored or processed by a system or device.
• The physical size of the storage device.
• The color coding used to represent different types of data.
• The speed at which data is transferred between devices.

Reorder the following

• Byte

• Gibibyte

• Nibble

• Kibibyte

• Mebibyte

Explain what is meant by lossless compression.

• Lossless compression only works for text files, not for images or videos
• Lossless compression results in lower quality images or videos
• Lossless compression removes some of the original data to reduce file size
• Lossless compression preserves all the original data and allows for perfect reconstruction.

Which of these can only use lossless compression?

• Audio files
• Video files
• Image files
• Text files, spreadsheets, and databases

Explain what is meant by lossy compression

• Lossy compression reduces file size by eliminating certain information
• Lossy compression only works on text files
• Lossy compression has no effect on file size
• Lossy compression increases file size by adding unnecessary information

What is a suitable purpose for lossy compression?

• Image files, audio streaming and video streaming

• Sending large files over email
• Backing up important documents
• Archiving high-quality images

Explain an advantage of lossy compression.

• Slowing down data transmission
• Reducing file size
• Increasing file size
• Preserving all details and quality