Data Representation Flashcards
2.1
How many bits are in a byte?
8
2.1
How many bytes in 1kB?
1000
2.1
List the all the memory size units in ascending order
bit,nibble,byte ,kilobyte ,megabyte ,gigabyte ,terabyte ,petabyte
2.1
By what number does the indices change by when a memory unit goes up
three
(From J276-02 GCSE (9-1) Computer Science May 2018 )
5 (a) (i) Convert the denary number 132 into an 8 bit binary number.
10000100
(From J276-02 GCSE (9-1) Computer Science May 2018 )
(ii) Convert the binary number 10110101 to its hexadecimal equivalent.
B5
2.3
What are the four rules of binary addition?
0 + 0 = 0
0 + 1 // 1 + 0 = 1
1 + 1 = 0 carry 1
1 + 1 + 1 = 1 carry 1
2.3
How do you translate from hexadecimal to denary?
multiply the first digit by 16 and add it to the value of the second digit/letter
2.3
How do you convert from denary to hexadecimal?
divide the number by 16.The value is the number of “16’s” their are, the remainder is the units
what happens to the number if it is shifted to the left once?
it multiplies the number by 2
how many bits in a binary code is the ASCII character given
7
how many different characters can be represented in ascii
128
How does extended ASCII differ from normal ASCII? How is the difference better?
it gives each character an 8-bit binary code instead of a 7-bit binary code. This is better because it can mean that double the amount (256) characters can be stored.
Why is Unicode good?
Unicode can represent all of the languages of the world. This includes languages that are not a part of the roman alphabet, such as Chinese, Greek and Arabic.
Define colour depth
the amount of bits available for colors in an image
