OCR Computer Science Paper one

1. 1. If a file has 2000 Bytes how many Kilobytes is it

• 2

• 16000

• 200

• 2000

2. 2. Which the equivalent to 2000 terabytes

• 2 Megabytes

• 2 petagbytes

• 2 kilobytes

• 2 bytes

What is 16 bits equivalent to?

• 2 megabytes

• 4 nibbles

• 2 kiloytes

• 2 bytes

4. The maximum number of numbers in 4 bits is

• 255

• 256

• 15

• 16

5 The highest number from 4 bits is

• 255

• 256

• 15

• 16

Convert the number 255 into binary

• 101010101

• 1111111

• 11111111

• 11111110

The method for coverting hexadecimal to binary is to

• Split into two

  convert each digit to its base ten equivalent

  to then convert each equivalent number to binary using nibbles

• Split into two

  Multiply the first number by 16 and then add the second number

• Write out a placevalue line

  Put the numbers under it

  convert to binary

What does a binary shift right do ?

• Multiplies by 8

• Divides by 8

• Multiplies by 3

• Divides by 3

What is a character set?

• A collection of numbers a computer recognises and understands from their binary form

• A collection of characters that a computer understands in its unique binary form

• a set of characters used to help you understand the world

• Characters you use on your phone

How many bits does American Standard Code for information interchange contain

• 7

• 8

• 16

• 32