1.3 Data Storage and Compression Cambridge IGCSE 0478

How many bits are there in a nibble?

• 4 bits

• 8 bits

• 2 bits

• 16 bits

How many mebibytes (MiB) are in a gibibyte (GiB)?

• 1024 MiB

• 1000 MiB

• 512 MiB

• 2048 MiB

What is the correct unit for 1024 gibibytes (GiB)?

• 1 tebibyte (TiB)

• 1 terabyte (TB)

• 1 mebibyte (MiB)

• 1 kibibyte (KiB)

Which of the following factors affects the file size of an image?

• Resolution and colour depth

• Sample rate and bit depth

• Frame rate and codec

• Pixel density and compression algorithm

What information is needed to calculate the file size of a sound file?

• Sample rate, bit depth, and length of track

• Resolution, frame rate, and colour depth

• Sample rate, frame rate, and resolution

• Bit depth, compression type, and resolution

What is the main purpose of data compression?

• To reduce file size for easier storage and transfer

• To improve the quality of files

• To make files more secure

• To convert files into different formats

How does lossy compression reduce file size?

• By permanently removing some data

• By compressing without losing any data

• By converting the file into a different format

• By storing data in a temporary location

Which of the following is an example of lossless compression?

• Run-length encoding (RLE)

• Reducing image resolution

• Lowering the bit rate of an audio file

• Removing high-frequency sounds from a recording

What is a disadvantage of lossy compression?

• It permanently removes some data, reducing quality.

• It increases file size instead of reducing it.

• It takes up more storage space than the original file.

• It requires more bandwidth to transfer files.

What happens when a file is compressed using lossless compression?

• The original file can be fully restored after decompression.

• The file is permanently reduced in quality.

• The file size remains the same.