Free Practice Quiz Question List

3. Digital Data Formats and Storage Online Quiz Questions

Use this free practice quiz with 20 questions to review 3. Digital Data Formats and Storage, test your knowledge, and prepare for your next test or exam.

20 questions

True or false

1 point

True or false: A bit pattern acquires meaning from an agreed-upon interpretation such as a character encoding, image format, or audio codec.

A
True
B
False

Choose one

1 point

Which statement correctly distinguishes a kilobyte (kB) from a kibibyte (KiB)?

A
A kilobyte is larger because 1,000 is greater than 1,024.
B
A kibibyte is larger because it contains 1,024 bytes while a kilobyte contains 1,000 bytes.
C
They are two names for exactly the same unit.
D
A kilobyte measures bits, while a kibibyte measures bytes.

Fill in the blank

1 point

Which file part usually identifies the format and records information needed to interpret the file? It is the .

True or false

1 point

True or false: Renaming a file from .png to .jpg converts the underlying image data into JPEG format.

A
True
B
False

Choose one

1 point

A designer needs a logo that must remain sharp at many display sizes. Which format is the most directly suitable because it stores geometric descriptions rather than a fixed pixel grid?

A
JPEG, because it is usually lossy and effective for photographs.
B
PNG, because it is lossless and supports transparency.
C
SVG, because it stores geometric descriptions that can scale.
D
TIFF, because it is often used for high-quality scans and preservation.

Choose all

1 point

Select all purposes for which lossless compression is an especially appropriate priority.

A
Preserving an archival master
B
Creating a small web image when some visual differences are acceptable
C
Storing scientific measurements whose exact values must be retained
D
Storing source code that must be recovered exactly
E
Streaming audio when the priority is the lowest practical data rate

Fill in the blank

1 point

In digital audio, the number of measurements recorded per second is called the .

Written response

1 point

Which Unicode encoding form uses one to four 8-bit code units per character and preserves the familiar one-byte values of ASCII characters? Enter the encoding name.

Choose all

1 point

Select all statements that accurately describe lossy compression.

A
It can produce substantially smaller files than lossless compression.
B
It may discard information that decompression cannot reconstruct exactly.
C
It always preserves every original value exactly.
D
Repeatedly resaving a lossy file can compound quality loss.
E
It guarantees that no processing is needed to decode the file.

Choose one

1 point

What approximate uncompressed data rate is produced by stereo PCM audio sampled at 44,100 samples per second with 16 bits per sample?

A
1,411,200 bits per second
B
705,600 bits per second
C
88,200 bits per second
D
1,411,200 bytes per second

Open ended

1 point

An organization must preserve a high-quality image for future editing and also publish a smaller copy on a website. Propose a format workflow and explain how it balances fidelity, storage, and distribution needs.

Choose one

1 point

Which statement correctly compares UTF-16 and UTF-32?

A
UTF-16 always uses exactly one 16-bit code unit per character.
B
UTF-16 uses one or two 16-bit code units per character, while UTF-32 uses one 32-bit code unit.
C
UTF-32 uses one to four 8-bit code units per character.
D
UTF-16 and UTF-32 are image compression formats rather than text encodings.

True or false

1 point

True or false: A media container and a codec are different concepts: the container packages streams and metadata, while the codec encodes or decodes particular content.

A
True
B
False

Choose one

1 point

Which statement correctly describes the relationship between a bit and a byte?

A
A bit contains eight bytes.
B
A byte contains eight bits.
C
A byte always represents one character.
D
A bit can represent 256 values.

Choose one

1 point

A user renames a file from photo.png to photo.jpg. What should software conclude from this change alone?

A
It changes the file's codec.
B
It converts the payload into the new format.
C
It does not convert the underlying data.
D
It removes the file's metadata.

Choose one

1 point

Which type of text is often especially storage-efficient in UTF-8 compared with encodings that use a fixed 32-bit code unit for every character?

A
Text containing many ASCII characters
B
Every text regardless of its characters
C
Only text containing mathematical symbols
D
Text that must use 32-bit code units

Choose one

1 point

Which format is the most appropriate choice for a graphic with sharp edges, text, and transparency when the image data should be preserved exactly?

A
A repeatedly edited photograph where the smallest file is always the priority
B
A streaming audio file
C
A database of exact scientific measurements
D
A graphic containing sharp text and transparency

Written response

1 point

An uncompressed RGB image is 1,000 pixels wide and 1,000 pixels high, with 8 bits per channel. Ignoring headers, metadata, and compression, what is its approximate size in bytes? Enter a whole number; no tolerance is allowed.

Written response

1 point

Uncompressed stereo PCM audio uses a sampling rate of 48,000 samples per second and 24 bits per sample. What is the data rate in bits per second? Enter a whole number; no tolerance is allowed.

Written response

1 point

A graphics program must preserve which optional image component so that partially transparent objects can be composited correctly over a different background? Enter the technical term.