Computer Science Topic 2 Revision January 2023

Which is the best answer to explain why computers use binary.

• Computers use circuits and logic gates. 1 or 0 represents on and off, which is true or false.

• Computers understand binary easier than human language so it can compile code faster.

• Computers have 8 states which are the bit values of binary to work out numbers.

• Computers use true or false statements and that is what 1 and 0 is.

How many bits are there in a Nibble? (Just give the number)

How many bits are there in a byte? (Just give the number)

How many bytes are there in a kibibyte? (Just give the number)

Which of these lists show the correct order for data storage capacities?

• bit

  nibble

  byte

  kibibyte

  mebibyte

  gibibyte

• bit

  nibble

  mebibyte

  byte

  kibibyte

  gibibyte

• byte

  kibibyte

  gibibyte

  bit

  nibble

  mebibyte

• kibibyte

  mebibyte

  gibibyte

  bit

  nibble

  byte

Calculate the denary conversion of this unsigned binary bit pattern.

1 0 1 0 1 0 1 0

(Give the denary value only as your answer)

Calculate the hexadecimal conversion of this unsigned binary bit pattern.

1 0 1 0 1 0 1 0

(Give the value as 2 digits)

Calculate the denary conversion of this 2s compliment binary bit pattern.

1 0 1 0 1 0 1 0

Convert the denary value 54 to 8 bit 2s Compliment Binary

Convert the denary value 54 to Hexadecimal