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Quiz: Data Units & Capacity

Test your knowledge of data units and file size calculations

Question 1 of 15

Question 1

Why do computers store all data in binary format?

Binary is easier for humans to understand Electronic circuits can reliably distinguish between two states (on/off) Binary takes up less storage space than other systems Binary was invented specifically for computers

Question 2

What is the smallest unit of data storage?

Byte Nibble Bit Kilobyte

Question 3

How many bits are in one byte?

4 bits 8 bits 16 bits 1,000 bits

Question 4

How many bits are in a nibble?

2 bits 4 bits 8 bits 16 bits

Question 5

How many kilobytes (KB) are in 1 megabyte (MB)?

100 KB 1,000 KB 1,024 KB 10,000 KB

Question 6

Which is the largest unit of data storage?

Gigabyte (GB) Terabyte (TB) Petabyte (PB) Megabyte (MB)

Question 7

What is the formula to calculate image file size?

Width + Height + Colour depth Width × Height × Colour depth Width × Height ÷ Colour depth (Width + Height) × Colour depth

Question 8

An image is 100 × 100 pixels with 8-bit colour. What is the file size in bytes?

800 bytes 8,000 bytes 10,000 bytes 80,000 bytes

Question 9

Which factors affect the file size of an audio recording?

Only the duration of the recording Sample rate, bit depth, and duration Only the sample rate The volume of the audio

Question 10

When calculating stereo audio file size, what must you do?

Divide by 2 (two channels) Multiply by 2 (two channels) Add 2 (two channels) Nothing different - stereo is the same as mono

Question 11

What sample rate is used for CD quality audio?

8,000 Hz 22,050 Hz 44,100 Hz 96,000 Hz

Question 12

A text file contains 2,000 characters using ASCII (8 bits per character). What is the file size?

250 bytes 2,000 bytes 16,000 bytes 2,000,000 bytes

Question 13

Your internet speed is 80 Mbps (megabits per second). How long to download a 40 MB file?

0.5 seconds 4 seconds 40 seconds 320 seconds

Question 14

What colour depth is needed to display 16.7 million colours (true colour)?

8-bit 16-bit 24-bit 32-bit

Question 15

You need to store 50 images, each 2 MB. What is the minimum storage needed?

25 MB 100 MB 100 GB 1 TB

Quiz Results

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