Comp 01 assorted short answer revision

ASCII has 8 bits per character.

Identify the maximum number of different characters that ASCII can represent.

(write your answer as a number)

(a)  

ASCII is a character set that uses 7 or 8 bits per character.

What is the name of the character set which includes all forms of written communication, including emojis.

(a)  

The ASCII code for the character J is the denary number 74.

Write the 8-bit binary number for the ASCII character J in the following boxes:

(a)  

The following paragraph describes embedded systems. Complete the paragraph by selecting terms from the list and writing them in the correct places. Not all terms are used. actuator applications change functions laptop larger lights microprocessor processor range smaller washing machine Embedded systems have limited ​ (a)   . They are often built into a ​ (b)   machine. Two examples of embedded systems are a ​ ​ (c)   and automated ​ (d)   in a car.

• functions
• larger
• washing machine
• lights
• actuator
• change
• laptop
• microprocessor

Layla is an artist. She draws images by hand. The image is then scanned and stored on a computer.

The table has four statements about the storage of images on a computer.

Tick (✓) one box in each row to identify if the statement is true or false.

2. Most videos include sound. The table has four statements about the storage of sound in a computer.
   
   Tick (✓) one box in each row to identify if the statement is true or false

Security on a computer can be provided directly by the operating system or by using utility programs.

Utility programs include antivirus, file transfer, firewall and system cleanup.

State which two of these utilities can be used for security.

• Anti virus

• File Transfer

• Firewall

• System Cleanup

State what is meant by a character set:

​ (a)   the different ​ (b)   a computer can ​ (c)  

• All
• characters
• represent
• Some of 
• None of
• pixels
• sounds
• visualise

Complete the table by writing the missing definition or name of each of the common CPU components and registers. CPU component or register

Definition ​ (a)   Stores the address of the next instruction to be fetched from memory. Increments during each fetch-execute cycle.

CU (Control Unit): ​ (b)  

​ (c)   Stores the address of the data to be fetched from or the address where the data is to be stored.

​ (d)   Performs mathematical calculations and logical operations.

• Memory Address Register (MAR)
• Co-ordinates the flow of data across the CPU
• Controls the information in RAM
• Controls the Inputs
• Memory Data Register (MDR)
• Program Counter (PC)
• Arithmetic Logic Unit (ALU)
• Accumulator
• Cache Memory

Drag and drop the component names onto the image

a

b

c

d

e

f

Memory Address Register (MAR)

Control Unit

Accumulator

Memory Data Register (MDR)

Arithmetic Logic Unit (ALU)

Program Counter (PC)