S4 Computer Systems Revision

Fill in the Blanks

1. Convert this binary number to denary

0011 1100

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2. Convert this denary number to binary

44

Multiple Choice

• 123

• 10

• 45

Multiple Choice

• 1101010

• 2

• 1010

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4. ASCII

Text is represented in computer systems using ASCII.

Each character is assigned a unique binary code.

How many bits does extended ASCII use to represent a single character?

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5. ASCII

How many characters can be represented by extended ASCII?

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6. ASCII

State how many bits would be required to store the following sentence in ASCII code

After all, tomorrow is another day.

Multiple Choice

7. Vector Graphics

What is this vector graphic shape known as?

• Ellipse

• Polygon

• Rectangle

• Line

Multiple Choice

8. 8. Vector Graphics

Which of the following is NOT an attribute of a Vector Graphic

• Line Colour

• Fill Colour

• X, Y Co-ordinates

• Number of Sides

Fill in the Blanks

A washing label on a sweatshirt has the following symbol.

Identify an object used to make this symbol.

Multiple Choice

9. JPEG FIles

How many bits are used to store one pixel in a JPEG file?

• 8

• 24

• 256

• 16777216

Fill in the Blanks

10. Bitmap Images

A website has been created to help users play video games. The website makes use of animated images.

State the type of image used

Multiple Choice

11. GIF files

How many bits are used to store one pixel in a GIF file?

• 8

• 24

• 256

• 16777216

Open Ended

Describe how a bitmap graphic is represented in a computer system’s memory.

Fill in the Blanks

12. Parts of the processor

Which part of the processor manages the fetching and execution of all instructions?

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13. Parts of the processor

Which part of the processor makes all decisions and calculations?

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14. Parts of the processor

Which part of the processor stores data and instructions temporarily?

Multiple Choice

15. RAM

What is not true about RAM?

• It stores data permanently

• It holds running programs

• It loses its contents when the computer is switched off

• It is organised into lots of separate memory locations

• It can be read from or written to

Fill in the Blanks

16. Buses

Which bus transfers an instruction from a memory location to the processor?

Fill in the Blanks

17. Buses

Which bus finds a single memory location to allow the processor to read or write to that location?

Match

18. Parts of a Processor

Once a program is implemented, state which part of the processor will execute the following tasks.

• Calculate Cost

• Transfer the next instruction from memory

• Stores the cost temporarily

ALU

Control Unit

Registers

• ALU

• Control Unit

• Registers

Multiple Choice

19. What is an advantage of an interpreter?

• The machine code is saved so the program only needs to be translated once.

• The user does not need a translator program to run the machine code therefore the program runs quicker and takes up less memory and processor time.

• Program will stop running when it encounters an error so it is easy to spot errors during the translation.

Multiple Choice

20. What is an advantage of a Compiler?

• The user does not need a translator program to run the machine code therefore the program runs quicker and takes up less memory and processor time.

• Easy to spot errors during the translation

• Program will run as soon as the first line is translated

Multiple Choice

21. Reducing energy use

What is the best way of reducing energy use when using computer systems?

• Using solar or wind power to charge batteries

• Recycling old computer systems

• Dimming screen, going to standby or shutting down when not in use

• Uninstalling apps, turning off WiFi, GPS and Bluetooth

Multiple Choice

22. What is a firewall?

• A network device that filters and checks all incoming and outgoing network traffic

• A network device that encrypts all data being sent so that, if intercepted, it cannot be read

• A network device that uses 2-factor authentication to verify your identity

• A network device that finds IP addresses based on URLs

Multiple Choice

23. Which technique is shown in this image?

• Translation

• Encryption

• Firewall

• Phishing

• Denial of Service