1.2.4 Data Storage (Binary, Hex, Shifts) & Data Representation Flashcards

1
Q

What is 0101 in denary? (1)

A

5

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2
Q

What is 11001111 in denary? (1)

A

207

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3
Q

What is 151 in binary? (2)

A

10010111 (1 mark per nibble)

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4
Q

What are the rules of binary addition? (4)

A

0 + 0 = 0. 0 + 1 = 1. 1 + 1 = 0 carry 1. 1 + 1 + 1 = 1 carry 1.

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5
Q

What is an overflow error? (2)

A

An extra carry bit (1) that cannot fit into the bits provided (1).

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6
Q

Convert 39 from hexadecimal to denary (1)

A

57

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7
Q

Convert 203 from denary to hexadecimal (2)

A

CB (one mark per digit)

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8
Q

Convert 10010011 from binary to hexadecimal (2)

A

93 (one mark per digit)

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9
Q

Convert FA from hexadecimal to binary (2)

A

11111010 (one mark per nibble)

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10
Q

How can you multiply a binary number by 2? (1)

A

Move all of the bits 1 place to the left.

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11
Q

How can you divide a binary number by 2? (1)

A

Move all the bits 1 place to the right.

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12
Q

What is a character set? (1)

A

The characters a computer system understands / displays.

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13
Q

How many potential characters can you store with a byte? (1)

A

256

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14
Q

How many potential characters can you store with 7 bits? (1)

A

128

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15
Q

How many characters can ASCII represent? (1)

A

128

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16
Q

How many characters can Unicode represent? (1)

A

256

17
Q

If the binary code for “A” was 65 what would be the code for “D”?

A

68

18
Q

Describe how a character set would be used to store the string “Hello world!” (2)

A

Each character in a character set has a unique binary value. (1) The binary values of each character are recalled in order. (1)

19
Q

How are images stored in binary? (3)

A

The image is split up into pixels. (1) Each pixel is given a binary code. (1) Which represents the colour of that pixel. (1)

20
Q

What is metadata? (1)

A

Data about data. Data about an image / sound file.

21
Q

What might metadata store about an image? (2)

A

Height (1) width (1) colour depth (1) resolution (1) author (1)

22
Q

What is the impact of increasing colour depth on an image file? (2)

A

More colours will be available (1) file size will increase (1)

23
Q

What is the impact of increasing resolution of an image file? (2)

A

More pixels will be used, increasing the detail of the image. (1) The file size will increase (1)

24
Q

How is sound stored in binary? (2)

A

The height of the sound wave is sampled at regular intervals (1) and converted to binary (1)

25
Q

What is the impact of increasing the bit depth on an audio file? (2)

A

The sound reproduced will be closer to the original (1) but file size will increase (1)

26
Q

What is the impact of increasing the sample rate of an audio file? (2)

A

The wavelength is sampled more often so the sound reproduced will be closer to the original (1) but file size will increase (1)