9.5 Data Representation

Question 1

What is the term used to describe the AND gate conditions?

Answer 1

Conjunction - both conditions need to be met.

Question 2

What is the term used to describe the OR gate conditions?

Answer 2

Disjunction - one condition needs to be met.

Question 3

What is the term used to describe the NOT gate conditions?

Answer 3

Negation - the opposite of the condition.

Question 4

How many bits are in a byte?

Answer 4

8

Question 5

What are the units of measurement?

Answer 5

Bit, nibble, byte, kilobyte, megabyte, gigabyte, terabyte, petabyte

Question 6

How can I remember the order of the units of measurement?

Answer 6

Use a mnemonic, e.g. Be Nice, Be Kind, Make Good on That Promise.

Question 7

What are the numbers in the binary number line?

Answer 7

128, 64, 32, 16, 8, 4, 2, 1

Question 8

When converted to denary, what is the binary number 1001?

Answer 8

8 + 1 = 9

Question 9

When converted to binary, what is the denary number 29?

Answer 9

11101

29 - 16 = 13; 13 - 8 = 5; 5 - 4 = 1

Question 10

What is meant by image depth?

Answer 10

The amount of bits available for colours in an image.

Question 11

What is meant by image resolution?

Answer 11

The fineness of detail that can be seen in an image - the higher the resolution of an image, the more detail it holds. In computing terms, resolution is measured in dots per inch (dpi).

Question 12

How do you calculate the size of an image file?

Answer 12

Colour depth x image height (px) x image width (px)

Question 13

What is the sample rate?

Answer 13

How many samples of data are taken per second. This is normally measured in hertz, eg an audio file usually uses samples of 44.1 kHz (44,100 audio samples per second).

Question 14

How is a sound recorded?

Answer 14

Sounds are produced by vibrations. This travels as waves, which are vibrating particles.

Question 15

How do you calculate the size of a sound file?

Answer 15

Sample rate x duration (s) x bit depth