Edexcel Computet Science Paper 1 Revision

An image is 100 pixels high and 10 pixels wide. Construct an expression to calculate how many pixels are needed to represent this image.

• 100/10=10

• 10/100=0.1

• 100*10=1000

Convert 0101 1111 1001 1110 1010 0000 to hexadecimal.

• 7A 6B E4

• 5F 9E A0

• F5 D6 7A

• D5 B6 A8

Convert the denary number 60 to 8-bit binary.

• 0011 1001

• 0110 0110

• 0001 1100

• 0011 1100

Convert the 8-bit binary number 0010 0011 to denary.

• 35

• 42

• 33

• 27

show the result of 0010 0011 + 0100 1010

• 0111 1000

• 0110 1001

• 0111 1101

• 0110 1101

Explain how an embedded system could control the headlights of a car.

• A sensor could be used (with a microprocessor) to determine light level to activate a switch / turn on/off the headlights.

• The headlights could be turned on via a switch in the car.

• The headlights turn on when it gets dark.

• The headlights are turned on using a button.

how many bits are needed to represent the 26 capital letters A to Z.

• 5-bits because 2^5 represent up to 32 values.

• 4-bits because 2^4 represents 16 values

• 7-bits

• 3-bits

Identify the type of physical storage that uses electronic circuits.

• Optical

• Magnetic

• The cloud

• Solid state

Identify the part of the CPU that sends signals to the other components.

• Arithmetic logic unit

• Control unit

• Register

• Bus

Identify the function of utility software.

• Repairing secondary storage

• Formatting cache memory

• Converting files

• Translating programs