GCSE: ASCII and Binary Codes

What is the fundamental way in which all data is stored in a computer system?

• Hexadecimal

• Binary

• Decimal

• Octal

What do the zeros and ones in binary represent?

• Three states

• Four states

• Two states

• Five states

What must all characters and emojis have in order to be stored in a computer system?

• Their own hexadecimal codes

• Their own binary codes

• Their own decimal codes

• Their own octal codes

If each character was represented by only one binary digit, how many possible characters could be stored?

• 1

• 2

• 3

• 4

How many bits are needed to store four possible characters?

• 1 bit

• 2 bits

• 3 bits

• 4 bits

If zero zero represents A, zero one represents B, one zero represents C, what does one one represent?

• A

• B

• C

• D

What is the minimum number of bits needed to represent the 26 letters of the alphabet?

• 3 bits

• 4 bits

• 5 bits

• 6 bits

How many characters can be represented with 5 bits?

• 16 characters

• 24 characters

• 32 characters

• 64 characters

What mathematical expression can be used to determine the number of characters that can be represented by a given number of bits?

If you have 3 bits, how many different characters can you represent?

• 4

• 6

• 8

• 10