Memory / Storage
Volatile as it is temporary storage and once the computer turns off, it erases everything stored in RAM.
MacOs
Windows
Linus
iOS
Android
Give an example of a system software?
State 6 arithmetic operators that can be used in Python for calculation?
Modulus - %
Exponentiation - **
Integer Division - //
+ - * / - the usual
How many bytes in a mebibyte, MiB?
1024 kibibytes
Name 3 types of secondary storage and 2 examples for each
Magnetic - tape, HDD
Optical - CD, DVD, Blu-Ray
Solid State/flash - SSD, Memory card, USB drive
What does FDEC stand for?
Fetch-Decode-Execute Cycle
Creation of a variable is made up of two parts.
number = 10
name = "hello"
What are they called?
Declaration - name given to identify the variable Initialisation - the assigning of the first value
Convert the following Hex value 4B9 into binary.
010010111001
State 4 characteristics of secondary storage you might consider when choosing a secondary storage device.
Capacity
Speed
Portability
Durability
Reliability
Cost
State the name of the computer architecture that consists of the main memory and CPU which interconnected by the busses. It allows for both instructions and data to be stored together in main memory.
von Neumann Architecture which is also known as the Stored Program Concept.
What is the built-in function for finding the number of characters that may be within a "string".
myText = "Hello"
numChars = 0
numChars = len(myText)
prrint(numChars)
How do we calculate the size of a bitmap image?
Resolution (width x height) x colour depth
Which secondary storage type would be best suited for daily back-ups in a school? Why?
Magnetic
Capacity
Speed
Portability - doesn't need to be moved
Fairly reliable
Cost
Name the three buses that connect the CPU with memory? And state the direction of the buses.
Control Bus - bidirectional
Data Bus - bidirectional
Address Bus - unidirectional.
Name the three programming constructs and give an example?
Sequence - input, process, output. the order of the program.
Selection - decision making, IF_ELIF_ELSE
Iteration - for and while loops
What is the -109 in binary? Explain the process of Two's Complement.
10010011
Explain how magnetic storage works.
Magnetic - moving parts, data stored on a surface of platter, use of magnets (north and south poles) -
Solid state - no moving - made up of chips, has tiny transistors (switches) that trap a pool of electrons. empty electron pool = 0, full pool =1.
Optical - uses reflective light off the surface of a disk. reads the pits = 0 (bumps) and lands = 1 (flat).
This sends out electronic signals at regular intervals to all the other components in order to synchronise their actions? State what it is measure in.
State three types of errors that may occur when programming in Python?
Runtime Error
Logic Error
Syntax Error
Name Error
Zero Division
Name the two coding systems/character set that we use to represent text and values for us humans to understand?
ASCII and UniCode