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2.1 - Data Representation Flashcards

Revision (29 cards)

1
Q

What is Bit short for?

A

Binary Digit

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2
Q

How many numbers can be represented by a Bit? What are they?

A

2 Numbers.

They can be a 0 or a 1.

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3
Q

What is the smallest unit of storage?

A

Bit

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4
Q

What is a collection of 8 bits known as?

A

Byte

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5
Q

Order these from smallest to largest.

TB, KB, GB, Byte, MB, Bit

A

Bit, Byte, KB, MB, GB, TB

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6
Q

How many bytes are in a KB?

A

1024 Bytes

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7
Q

How many GB are in a TB?

A

1024 GB

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8
Q

How many bits are in a byte?

A

8 Bits

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9
Q

How many MB are in a GB?

A

1024 MB

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10
Q

How many KB are in an MB?

A

1024 KB

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11
Q

How much storage space would be required to store a characters in a text file (e.g. T, +, 7)

A

1 Byte

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12
Q

How much storage would be required to store the word “Computer” in a text file?

A

8 Bytes (One for each character)

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13
Q

How much storage would be required to store a 64 x 64 pixel jpeg file?

A

12 KB

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14
Q

How much storage would be required to store a 10-megapixel photo?

A

11 MB

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15
Q

How much storage would be required to store a five minute MP3 audio file?

A

5 MB

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16
Q

How much storage would be required to store one hour of video data?

17
Q

Is KB and Kb the same unit of measurement?

A

No.

KB stands for Kilobytes

Kb stands for Kilobits

18
Q

To calculate the range of values for n bits we have to use which formula?

19
Q

If you were to write an 8 bit binary number. What is the left most bit known as?

A

Most Significant Bit (MSB)

20
Q

If you were to write an 8 bit binary number. What is the right most bit known as?

A

Least Significant Bit (LSB)

21
Q

If you are converting a denary number into its binary form, what are the headings you would use?

A

128 64 32 16 8 4 2 1

22
Q

After you have worked out a binary value for a denary number what should you always do to ensure your answer is correct?

A

Add up all of the headings with a 1 underneath them to ensure that you have got the correct answer.

23
Q

Why do we need to use a Two’s Complement System?

A

To allow for negative numbers to be shown

24
Q

In Two’s Complement, the MSB becomes a _____________, to tell us if the number is either positive or negative.

If the number is positive you will see a _____ at the beginning of the binary number.

If the number is negative you will see a _____ at the beginning of the binary number.

25
What is the range of values for typical binary numbers?
0 - 255
26
What is the formula we use if we are finding Two's Complement numbers?
(-2n - 1) to (2n-1 - 1)
27
When working out Two's Complement numbers we have to go through 3 steps. What is missing from each step? Step 1: Convert 71 into ___________ Step 2: _________ the bits. Change 0's to 1's and 1's to 0's. Step 3: Add ____
1. Binary 2. Flip 3. 1
28
What is a character set?
1. Set of symbols that may be represented in a computer at a particular time 2. Symbols called characters can be classified as letters, numbers and punctuation marks. 3. Each character has a unique binary code. 4. These include displayable characters, letters, numbers and punctuation marks. 5. Also contains "control" characters: Non-printing and used for special purposes e.g. end of file marker. 6. Two examples include ASCII and Unicode
29