14 J277 1.2 Data capacity calculations

How can the size of a text file be calculated for GCSE exams?

• By multiplying the number of bits it takes to store a single character by the number of characters in the text file.

• By multiplying the sample rate by the duration in seconds by the bit depth.

• By multiplying the colour depth of an image by its height in pixels by its width in pixels.

• By dividing the number of characters by the number of bits it takes to store a single character.

What is the capacity of an 8TB hard drive in megabytes?

• 8 million megabytes

• 8 billion megabytes

• 8 thousand megabytes

• 8 hundred megabytes

How is the size of a sound file calculated for GCSE exams?

• By multiplying the sample rate by the duration in seconds by the bit depth.

• By multiplying the number of bits it takes to store a single character by the number of characters in the text file.

• By multiplying the colour depth of an image by its height in pixels by its width in pixels.

• By dividing the sample rate by the duration in seconds by the bit depth.

How is the size of an image file calculated for GCSE exams?

• By multiplying the colour depth of an image by its height in pixels by its width in pixels.

• By multiplying the sample rate by the duration in seconds by the bit depth.

• By multiplying the number of bits it takes to store a single character by the number of characters in the text file.

• By dividing the colour depth of an image by its height in pixels by its width in pixels.

How many photos can be stored on a 256,000MB storage device if each photo is 4.3MB?

• A) 60,000

• B) 50,000

• C) 70,000

• D) 80,000

How many music files can fit on a 640MB CD if each music file is 8.4MB?

• A) 76

• B) 64

• C) 80

• D) 72

What is the formula to calculate the size of a text file?

• A) Bits per character × Number of characters

• B) Bits per character + Number of characters

• C) Bits per character ÷ Number of characters

• D) Bits per character - Number of characters

If a text file has 244 characters and each character takes up 7 bits, what is the size of the text file in bytes?

• A) 214 bytes

• B) 244 bytes

• C) 200 bytes

• D) 230 bytes

How many bytes is a sound file of 3 seconds long with a sample rate of 6 intervals per second and a bit depth of 4?

• A) 9 bytes

• B) 8 bytes

• C) 7 bytes

• D) 6 bytes

How many bytes is an image file with a height of 14 pixels, width of 17 pixels, and a colour depth of 3?

• A) 90 bytes

• B) 80 bytes

• C) 70 bytes

• D) 60 bytes