Calculating File Sizes and Conversions

The video tutorial explains how to calculate the size of different types of files, such as text, image, and sound files. It emphasizes the main rule of multiplying all relevant factors except metadata, which should be added separately. The tutorial provides examples for each file type, demonstrating calculations in bits, bytes, and kilobytes. It also highlights the importance of understanding the units required for answers and offers tips for exam scenarios.

What is the primary rule for calculating file sizes?

• Add all factors together.

• Divide all factors by the number of files.

• Subtract metadata from the total size.

• Multiply all factors together except metadata.

How do you calculate the size of a text file with 32 bits per character and 20 characters?

• 32 - 20

• 32 x 20

• 32 / 20

• 32 + 20

In a computer science exam, what tool is typically unavailable for calculating file sizes?

• Calculator

• Protractor

• Ruler

• Compass

What is the first step in calculating the size of an image file with a color depth of 4 bits, height of 12 pixels, and width of 20 pixels?

• Multiply the color depth, height, and width.

• Add the color depth, height, and width.

• Subtract the height from the width.

• Divide the color depth by the height.

How do you convert bits to bytes?

• Multiply by 8

• Add 8

• Subtract 8

• Divide by 8

What additional step is needed when calculating image file size if metadata is present?

• Subtract metadata from the total size.

• Ignore metadata.

• Multiply metadata by the total size.

• Add metadata to the total size.

What is the bit depth of a sound file if each sample is 16 bits large?

• 8 bits

• 64 bits

• 16 bits

• 32 bits

How do you convert bytes to kilobytes?

• Subtract 1000

• Multiply by 1000

• Add 1000

• Divide by 1000

What is the sample rate of a sound file if it is considered poor quality?

• 8,000 Hz

• 16,000 Hz

• 88,000 Hz

• 44,000 Hz

What should you do if a question asks for the file size in bytes instead of bits?

• Subtract 8

• Add 8

• Divide by 8

• Multiply by 8