CS Quick Revision

5.1 Internet and the World Wide Web

Multiple Choice

What piece of hardware is used to sample a sound wave?

• Digital-analogue converter

• Wave synthesizer

• Microphone

• Analogue-digital converter

Multiple Choice

What does the bit rate of a sampled sound refer to?

• The number of bits used for 1 second of audio

• The number of bits used for every sample

• The final file size of the sampled sound

• The speed at which the sampled sound is played back

Multiple Choice

Pixels get their colour from a combination of which colours?

• cyan magenta yellow black

• red green blue

• primary colours

• black white

Multiple Select

Which factors affect the file size of a bitmap image? (select all that apply)

• pixel density

• image dimensions

• colour depth

• software used to create it

• format of image meta-data

Multiple Choice

If an image has a colour depth of 8 bits then the number of possible colour shades is ... ?

• 256

• 8

• 16

• 2014

Multiple Choice

What are the smallest elements of a digital image called?

• colors

• bits

• dots

• pixels

Multiple Choice

in which galaxy do we live ?

• Earth

• Soler System

• Milky Way

• Andromeda Galaxy

Open Ended

What is your favorite candy?

Multiple Choice

How many bits was used to encode the original ASCII character set?

• 7

• 8

• 16

• 4

Multiple Choice

The Extended ASCII system uses 8 bits per character instead of 7 bits. How many different characters can be represented in 8 bits?

• 1024

• 8

• 128

• 256

Multiple Select

Which of these variables affect the file size of a sampled sound? (select all that apply)

• the bit depth

• the sampling frequency

• the bit rate

• the length of the sampled sound

• the type of sound (speech, music etc)

Multiple Select

Choose all the Boolean logic gates ...

• NOT

• AND

• BUT

• XOR

Multiple Choice

Which logic gate is this truth table for?

• AND

• OR

• NOR

• XOR

Multiple Choice

Truth table for OR gate?

Multiple Choice

Which is the BEST definition of the Internet?

• A hyper-text based information resource stored on servers around the world

• A wide-area network that covers a very large area

• A world-wide system of inter-connected networks

• A black-box found in most people's houses that connects to the outside world

Open Ended

What is your favorite thing to do?

Multiple Choice

Which is the BEST word to describe the type of network that is the Internet?

• expensive

• centralised

• complicated

• distributed

Multiple Choice

Which is the BEST definition of the World Wide Web?

• A world-wide network of networks

• A hypertext-based online information space where content is identified by Uniform Resource Locators

• A system of computer servers connected by routers around the world

• A piece of software called a browser that shows you online content

Multiple Choice

Who is recognised as being the founding figure of the World Wide Web?

• Richard J. Stallman

• Tim Berners-Lee

• Vinton Cerf

• Larry Page

Multiple Choice

A unique identifying number that is assigned to all devices connected to the Internet?

• IP address

• MAC address

• TCP/IP

• URL

Multiple Choice

What is this?

A networking device that forwards data packets between computer networks

• Gateway

• Server

• Modem

• Router

Multiple Choice

Which protocol is used in the communication between a client and a web server?

• TCP

• HTTP(S)

• HTML

• FTP

Multiple Select

Select all the types of code that will be found on most modern web pages?

• HTML

• CSS

• JavaScript

• Java

Multiple Choice

What is the main purpose of the Domain Name System (DNS)?

• It is a large database of all the Internet domain names in existence

• It is where you apply to register a new domain name

• It is where you submit a website for page ranking

• It translates domain names to the numerical IP addresses needed for locating and identifying computer services

Multiple Choice

What is HTML?

• A network protocol used to transfer a web page from a web server to a client

• A markup language used to define the structure and content of a web page

• A method of defining the look and feel of a webpage using styles

• A web programming language used to make web pages interactive

Multiple Choice

This is the sequence of steps involved in downloading a web page from a web server using HTTP. Which is the missing step?

1. User enters desired URL address into browser
2. ?
3. Browser connects to server and requests the resource
4. Web server responds by sending requested page content

• Computer makes connection to ISP

• Browser checks validity of entered URL

• Computer initiates HTTP connection to server

• Computer uses DNS to lookup correct IP address of server

Poll

would you rather

• be the best player on a team that always loses

• be the worst player on a team that always wins

Multiple Select

Which of these are recognised types of file compression? (select all that apply)

• lossless

• lossy

• superchannel

• standard

• redundant

Multiple Select

What are the main reasons to compress data? (select all that apply)

• To reduce secondary storage space

• To maximise the available RAM memory

• To speed up network transmission times

• To optimise the data

• To reduce packet congestion on networks

Multiple Choice

True or False? We use hexadecimal numbers in computer science because we can represent 16 bit words as 4 hexadecimal digits

• True

• False

Multiple Select

Which of these are recognised lossless compression algorithms? (select all that apply)

• RLE

• Caesar cipher

• Merges sort

Multiple Choice

Which of these audio file formats support lossy compression?

• FLAC

• MP3

• WAV

• OggPCM

• WMA

Multiple Choice

Asymmetric encryption is when ...

• a message is encrypted and decrypted using two different keys: a public one and a private one

• only one message can be encrypted at a time

• An encrypted message is received, but there is no requirement to return an encrypted message

• There is no key available to decrypt an encrypted message that has been received

Multiple Choice

Data transmitted several bits at a time down several wires in both directions simultaneously

• Serial

• Parallel

Multiple Choice

Data transmitted several bits at a time down several wires in both directions simultaneously

• Simplex

• Half-duplex

• Full-duplex

Poll

Would you rather...

• lose your sense of taste?

• lose your sense of smell?

Multiple Choice

Data is trasmitted one bit at a time down a single wire, the data is transmitted in both directions but not at the same time.

• Simplex

• Half-duplex

• Full-duplex

Poll

Would you rather...

• find out every lie your parents have ever told you...

• have them find out every lie that you have told them?

Multiple Choice

True or False? We use hexadecimal numbers in computer science because its easy to convert hex back to binary if necessary

• True

• False

Multiple Choice

Hardware identification number that uniquely identifies each device on a network.

• IP address

• MAC address

• Internet Service Provider

Multiple Choice

Company that provides individuals access to the internet

• IP address

• MAC address

• Internet Service Provider

Multiple Choice

An odd parity check was used here. Is this correct? 10011100

• Correct

• Incorrect

Multiple Choice

What is the hexadecimal value 2D equivalent in denary (base 10)?

• 2014

• 45

• 33

Multiple Choice

What is 10111100 in hex?

• 15

• AD

• BC