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Question 1

What is the difference between secondary and primary memory ?

Answer 1

Primary: CPU has direct access to (registers, cache, ROM & RAM)
Volatile ( only on with power)
Fast read/write speed
Secondary: not directly accessible
Non-volatile
Where data is stored when not in use
Slow read/ write speed

Question 2

Magnetic Hard Disks

Answer 2

Made up of magnetised metal disks spinning .
1 &0 for magnetised and demagnetised
Data is stored in sectors , on tracks.
Read write head on a movable arm accesses these sectors.
Long lasting( but moving parts), cheap, large capacity

Question 3

Solid state (flash)

Answer 3

Drive:
Data stored in electrical circuits, by tapping electrons. (Transistors)
Fast read write time. 
Don’t need defragmentation 
More long lasting, no heat
no moving parts, 
Silent

Question 4

Optical discs

Answer 4

Eg: CD, DVD, blue Ray
Pits/ (0)holes are made, the reflected beam from laser read is the data
Low capacity, cheap, portable , slow read/write

Question 5

What is Cloud storage

Answer 5

Data is uploaded via the internet to a remote server (stored on HDD/SSD) . You pay with a subscription.

Question 6

Roles of the OS

Answer 6

Communicating with input output devices/ via device driver
Process manager- CPU and it’s time with programs
Providing a platform for applications to run
Memory management- how much RAM a program has access to
File management-read/write/delete
System management- user passwords

Question 7

Why is secondary storage required?

Answer 7

To store long term
Retains data when no power (non-volatile)
High capacity

Question 8

What is durability?

Answer 8

How much physical damage it can take without breaking

Question 9

Put in order , in terms of how quickly data is transferred (speed)

Answer 9

Solid
Magnetic
Optical

Question 10

What are the shapes for AND, OR,NOT and XOR

Answer 10

And- D
Not-triangle &circle
Or- arrow head
XOR- arrowhead with line, does not accept two trues

Question 11

How do you calculate the total number of combinations for a truth table?

Answer 11

2 * * number of inputs
Eg:
2* * 3 =8
2**2= 4

Question 12

Symbols for NOT, OR, AND, NOT OR

Answer 12

Not= line overhead
And = .
Or= +
Not or = circle over +

Question 13

What are advantages and disadvantages of cloud storage?

Answer 13

:)can be accessed from anywhere,
data can be shared ,
cheap,
provides back up/security

:( need Wi-Fi,
data vulnerable to hackers,