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WorksheetsHigher: Computer Systems
Total questions: 50
Worksheet time: 32mins
A common notation used to store negative integers is called?
two's complement
two's compliment
binary notation
integers notation
What is an Extended ASCII?
8 bit code
Stores 256 different text characters
Limited to storing some control characters, numbers, the alphabet used in English
Selection of characters from other languages
Unicode is used to store text characters. 16 bit Unicode can store 65 536 characters including many different alphabets, symbols and even emojis. It's used in web-coding to display a non-standard characters.
TRUE
FALSE
Graphics can be stored as a:
bit-mapped graphics
vector graphics
animation graphics GIF
graphics supporting transparency such as PNG
A bit-mapped graphic comprises rows and columns of coloured pixels.
TRUE
FALSE
The storage requirements of a bit-mapped graphic are determined by the number of:
(a)
Select correct representation for graphic's resolution:
1400x800
1400:800
1400=800
1400/800
The number of bits used to store each pixel is called colour ...?
(a)
A vector graphic is created from:
shapes
colours
instructions
pixels
Select attributes stored and saved as a list to create regular shapes of vector graphic:
x and y coordinates
length and width
fill colour
line thickness
Irregular shapes in Vector Graphic save and store an attribute different than the list saved in regular shapes.
What is the name for that attribute?
position of nodes along with the angle the line leaves each node and determined by the position of the handles.
position of nodes along with the multiply lines which each node leaves
position of x and y coordinates with the single line leaves each node
the colour depth declared by number of bits to store each pixel
Select most frequently used bit-mapped file types:
bmp
jpg
gif
png
What are the storage requirements for bit-mapped graphics?
Graphic Resolution
Graphic Colour Depth
Graphic size in megabytes storage units
Graphic name saved as a file name
Graphic of low-resolution, enlarged so the individual pixel become larger giving a blocky effect is known as:
pixilation
pixilosis
pixel loss
pixelloose
Computer System's architecture has been developed by mathematician John von Neumann in the 1940s.
TRUE
FALSE
While a program is running, buses are used to locate and then carry each program instruction from the memory to the processor where it is:
decoded and executed
encrypted and send away to the recipient
decrypted and displayed to the creator of instruction
send away to store its data in main memory
Select all steps followed by fetch-executed cycle:
The memory address of the next instruction to be fetched is placed on the address bus.
The read line of the control bus is activated by the control unit.
The instruction is located at the memory address specified by the address bus. The contents of the address are then sent along the data bus to the processor.
The instruction is then decoded and executed by the processor.
Select all that apply to multicore processors:
has "parallel" processing capabilities
can only attend to one set of instruction a time
the maximum size of "word" is 32 bits
several instructions can be executed simultaneously
Select two available width of data bus:
16 bits
32 bits
64 bits
128 bits
If the data bus is widened from 32 bits to 64 bits wide, then twice the amount of data is transferred from the memory to the processor during each fetch-execute cycle.
TRUE
FALSE
What is most often the slowest step of the fetch-execute cycle?
fetching of instructions from memory
executing the instructions within processor
sending the result of process to the output device
saving the result of process on backing storage
Cache is high-speed memory which is located near the...?
(a)
Select all that applies to techniques used by Cache to speed up the fetch-execute cycle:
Instructions that are regularly repeated (loops) or instructions that are frequently used (for example, a procedure that's frequently called) are retained within cache memory, while a program is running. This means that these instructions can be fetched much faster.
The computer system doesn't wait until next instruction in a program is fetched but rather preloads the instructions to cache, anticipating that they will be used next.
If a processor wishes to store data temporarily, it will be faster to fetch the data again if it is stored temporarily, it will be faster to fetch the data again if it is stored temporarily in cache memory.
The wide data buses (>=256 bits) found in cache memory mean more data is transferred in one cycle.
Increasing the speed of the clock's pulse is called...?
over-clocking
over-clicking
clock-speeding
speed-up
By increasing the speed of the clock's pulse in other word - over-clocking, a computer system may run faster and improving processing performance.
TRUE
FALSE
The clock within a computer system produces a pulse which other components use to:
time sequences of events like fetch-execute cycle
time stamp user's input
save the date and time of every output produced to user
show to user correct time
Select three computer systems which are being used to save energy by controlling our environments:
heating systems
traffic control
car management systems
in store payments system
Computer Misuse Act was created in:
1980
1990
1993
1999
In 1990 the UK parliament created a Computer Misuse Act which is now used to prosecute people who do the following:
Gain unauthorised access to computer material. Either through hacking from a distance or gaining direct access to a computer.
Gain access with the intent to commit a further offence. For example using the data/knowledge obtained to commit another crime like fraud or blackmail.
Modify data or programs on a computer system without authorisation.
Dispose old equipment in unsafe way so the personal data is exposed and not encrypted
Tracking cookies are small plain-text files that are stored within your browser when you access any website that uses cookies. When you return to a website, the stored cookie is sent to the server which responds by providing a personalised browsing experience.
TRUE
FALSE
Select all what cookies may store in a form of data:
login details to log you back into a website automatically
session details, ex. retaining the contents of a shopping basket while you browse other pages within a website
browsing behaviour, like websites you have visited or products you have looked at
graphic files which you have downloaded to your hard drive
Cookies should only be sent to sites using:
(a)
HTTPS stands for Hypertext Transfer Protocol Secure
TRUE
FALSE
DOS stands for Denial of Service
TRUE
FALSE
Denial of Service attack aims to:
prevent access to a computer system or network by legitimate users
stealing login details to user accounts
redirecting the network traffic to other device within network
stealing sensitive data from user's device
Preventing access to a computer or network can be done by flooding the system with meaningless requests which may involve:
Bandwith Consumption
Resource Starvation
DNS Attack
Changing login details for all network users
Bandwidth Consumption is overloading the bandwidth of the network connection to the system.
TRUE
FALSE
Resource Starvation is causing so many processes to run simultaneously that systems become starved of resources (memory, processor time)
TRUE
FALSE
DNS attack is hampering access to a domain name server (DNS), the system that converts web address requests into IP addresses required to direct your internet connection to a requested website.
TRUE
FALSE
SELECT all that can be symptoms of a DOS attack:
inability to access system
experiencing extremely slow performance
loss of WIFI network connection
Unexpected shut down of device
SELECT all that may result in event of DOS attack:
lost revenue by company
unexpected costs required to resolve attack
reduction in electricity bill
rewards for users who have been impacted by attack
SELECT all reasons for which DOS attack may be carried out:
personal
financial
political
none of these
Encryption is used to hide data from unathorised individuals.
TRUE
FALSE
What are the name for pairs of encryption keys?
public and private
encrypted and decrypted
positive and negative
available and hidden
What kind of key is used to encrypt the message is send it over to the recipient?
public
private
What kind of key is used to decrypt a message received from sender?
public
private
Public keys are contained in a digital certificate, which acts as an online passport.
TRUE
FALSE
A digital certificate contains:
the name
serial number
expiration date
digital signature of the authority that issued the certificate
Digital certificates are resistant to forgery.
TRUE
FALSE
How many processors are inside Quad Core Processor?
1
2
4
8
