cs J277 Unit 2 Data Rep

What is a byte?

• 4 bits

• 8 bits

• 1,000 bits

What is sampling?

• Sound recorded at regular intervals

• Colour picked from a photograph

• Sound represented digitally

What is denary 55 in 8-bit binary?

• 10010011

• 00110111

• 00110110

What is denary 55 in hexadecimal?

• 37

• 58

• 42

What is the purpose of a binary shift?

• To multiply/divide binary numbers

• To add/subtract binary numbers

• To convert binary numbers to hexadecimal

What is metadata?

• Data about data

• Colour data

• Sound data

Give one reason why data is represented in binary in a computer

• The digits 0 and 1 can be represented by a switch being ON or OFF

• The digits 0 and 1 are represents of Machine X Code

How many bytes are there in a MB?

• 1000 bytes in a KB. 1000 KB in a MB. 1000 x 1000 = 1,000,000 bytes in a MB.

• 1100 bytes in a KB. 1100 KB in a MB. 1100 x 1100 = 1,001,000 bytes in a MB.

Colours in art packages are often given Hex codes as illustrated below with #00ccff. Why is Hex used in this way rather than the actual 24-bit colour value?

• It is quicker/shorter/less prone to error to re-enter a six character Hex value to reproduce an exact colour than a long binary value

• The code only takes up six characters on screen rather than 24

• It is easier for designers and software users to remember hex codes rather than a binary value

• it can be encoded straight away in HEX though designed BUS wires

What is an Overflow error?

• An overflow error occurs when the addition requires a carry bit into the ninth bit

• An overflow error occurs when the addition requires a carry bit into the eighth bit

• An overflow error occurs when the addition requires a carry bit into the tenth bit