Sound Representation

Multiple Choice

What is meant by Data Representation?

• Data representation refers to the visual display of data in charts and graphs.
• How data is organized and represented in a way that computers can understand and process.

• Data representation is the process of deleting unnecessary data from a database.
• Data representation is the physical storage of data on a hard drive.

Multiple Choice

What is Bit Depth

• Bit depth indicates the file size of an image.
• Bit depth is the number of bits used to represent the colour of a pixel in digital images.

• Bit depth is the number of pixels in an image.
• Bit depth refers to the resolution of an image.

Multiple Choice

How are colours stored in a computer?

• Using numbers and letters

• As shades of grey only

• In a hexadecimal format

• Using pixels and numeric codes

Multiple Choice

What is a pixel?

• A type of computer memory

• The smallest unit of a digital image (tiny square)

• A programming function

• A colour format

Multiple Choice

What are the RGB values for the color red, and what do they represent?

• (255, 255, 255) – All colors at full intensity

• (0, 255, 0) – Only green is at full intensity

• (255, 0, 0) – Only red is at full intensity

• (0, 0, 255) – Only blue is at full intensity

Multiple Choice

Which RGB values represent the color blue at full intensity?

• (0, 0, 255)

• (255, 0, 0)

• (0, 255, 0)

• (255, 255, 255)

Multiple Choice

What is the formula for calculating image size?

• Image Size = Width + Height + Color Depth
• Image Size = Width x Height
• Image Size = Width x Height x Color Depth x 8
• Image Size = Width x Height x Colour Depth

Multiple Choice

An image has a resolution of 1024 × 768 pixels and a 16-bit colour depth. What is the image size in bytes?

• 1,572,864 bytes

• 12,582,912 bytes

• 786,432 bytes

• 1,572,864 bits

Multiple Choice

What is Sampling?

• The number of bits used to store an image

• The process of measuring an analog signal at regular intervals to create a digital representation

• The number of sound waves per second

• The amount of memory needed for a digital file

Multiple Choice

What is a Wave?

• A repeated movement or vibration that travels through a medium, like sound in air.

• The amount of storage space needed for a sound file.

• The number of pixels in an image

• The process of increasing sound quality.

Multiple Choice

What is Audio?

• A type of image file format

• The digital representation of visual data

• Sound that is recorded, transmitted, or reproduced

• The number of samples in a digital image

Multiple Choice

How does a Microphone Capture Sound?

• By converting sound waves into electrical signals

• By playing back stored digital data

• By amplifying existing audio signals

• By increasing sound frequency

Multiple Choice

What is the Role of a Speaker in Sound Representation?

• It converts digital signals into electrical signals

• It converts electrical signals back into sound waves

• It records sound for further processing

• It increases the number of sound samples

Multiple Choice

What is a Sound Wave?

• A digital file format used for storing music

• A visual representation of an audio file

• A repeating vibration that travels through a medium (air, water, etc.)

• A binary code representing different sounds

Multiple Choice

What are the Key Factors in Sampling?

• Resolution and pixels

• Colour depth and frame rate

• Bitrate and file type

• Sampling frequency and sample size

Multiple Choice

What is Bitrate?

• The number of bits processed per unit of time in an audio file

• The frequency at which sound is recorded

• The amount of data used for colour representation in images

• The number of pixels in a digital image

Multiple Choice

What is Bit Depth?

• The number of sound waves per second

• The storage capacity of a computer’s audio system

• The number of bits used to store each sample in a digital sound file

• The number of pixels used in an image

Multiple Choice

What is a typical CD recording?

• A digital audio format stored on a compact disc with 44.1 kHz sampling rate and 16-bit depth.
• A digital audio format with 48 kHz sampling rate and 24-bit depth.
• An analog audio format stored on a cassette tape.
• A vinyl record with a 33 RPM speed.

Match

Match the following with their appropriate answer

• Higher Sampling Rate & Bit Depth

• Lower Sampling Rate & Bit Depth

• High bitrate

• Low bitrate

Better Quality, Larger Files

Lower Quality, Smaller Files

More detail in sound, but takes more spa

Smaller file, but may lose detail

• Better Quality, Larger Files

• Lower Quality, Smaller Files

• More detail in sound, but takes more spa

• Smaller file, but may lose detail

Multiple Choice

What is the formula to calculate the file size of an audio?

• File Size (bytes) = Duration (s) × Bitrate (bps) / 8
• File Size (bytes) = Duration (s) × Sample Rate (Hz)
• File Size (bytes) = Duration (s) × Channels × Bit Depth
• File Size (bytes) = Bitrate (bps) × Duration (s) × 8

Multiple Choice

What is the correct formula for calculating the file size of an uncompressed audio file?

• File Size = Sampling Rate × Sample Size × Channels × Duration

• File Size = Sampling Rate ÷ Sample Size × Channels × Duration

• File Size = (Sampling Rate × Channels) ÷ Sample Size × Duration

• File Size = Sample Size × Channels ÷ Sampling Rate × Duration

Multiple Choice

How large is a 20-second stereo audio file recorded at 48,000 Hz with a sample size of 24 bits?

• 14.4 MB

• 2.76 MB

• 27.65 MB

• 276 KB

Match

Match the following with their appropriate answer

• Higher Sampling Rate & Bit Depth

• Lower Sampling Rate & Bit Depth

• Low bitrate

Better Quality, Larger Files

Lower Quality, Smaller Files

Smaller file, but may lose detail

• Better Quality, Larger Files

• Lower Quality, Smaller Files

• Smaller file, but may lose detail