ICT Multiple Choice Y5 - tick one correct response only!
(1) The output from a keyboard is an eight bit binary ASCII code. A letter of the alphabet would be coded in this way. The lowest value is 00000000 and the biggest is 1 1 1 1 1 1 1 1
The code does not have enough options for upper and lower case and a shift is used An 8 bit binary code (0 or 1) has 256 possible values - enough for a keyboard The binary value 2 is only used for the special characters When a key is pressed the signal moves at the speed of light into the computer It is untrue that the keys are scanned rapidly as they are each directly connected
(2) You have just bought a second hand computer and wish to view web pages. Assuming the computer has a functioning modem - what is the first step:
Register a domain name Get an Email address Sign up with an ISP You need to host your domain name A printer is necessary first
(3) A group of computers are connected together in order to share information & peripherals.
WAN's (Wide Area Networks) can link computers in different countries LAN's (Local Area Networks) usually extend beyond a single site It is always impossible to share peripherals anyway Devices in a network are called topologies They can be connected in a variety of ways called nodes
(4) Computers can be interconnected or networked in the following ways:
In a star network all computers are of equal importance In a hierarchical network all computers are also of equal importance A line or bus topology is expensive and relies on a controlling computer A star network topology is cheap and very slow In a ring network the computers are of equal importance
(5) The following are examples of output devices - choose the correct example.
Graphics Tablet Optical Character readers which can recognize scanned text EPOS (Electronic Point of Sale) - a cash register LCD (Liquid Crystal Display) which is an enclosed liquid that goes black EFTPOS (Electronic Fund Transfer at point of sale) - used for "swipe/debit" cards
(6) The digitized wave below is moving to the right so that the Least Significant Bit (LSB) is in the front. It could be the output from a keyboard. Find the number (in normal decimal counting) that it will represent:
10110101 (binary) = 256 (decimal) It is 10,110,101 in decimal The biggest number on the keyboard is 9 so there is an error 10110101 (binary) = 181 (decimal) 10110101 (binary) = 74 (decimal)
(7) Computers in a network perform different tasks:
All computers in any network are nevertheless workstations There are no workstations and at least 5 servers in any network A file server provides a hard drive which the other computers can access A print server slows down the workstations as it hands over extra print tasks A network card is not necessary as the computers are networked already
(8) The table below shows the difference between mathematical and legal logic. This mathematical logic process is used for queries & data base searches and also to process digital signals. 0 = false (off) while 1 = true (on - about 5V)
1 or 1 or 0 or 0 = 0 (maths answer is false) I will do A x-or B means I can do both 1 x-or 0 x-or 1 = 1 I will do A and B means that if I do both I will be fibbing Those reading the "Times" or "Mail" would include those reading both (maths or)
(9) An analogue (continuous & non-digitized) audio (sound) signal is the tone sent down a telephone line by a 56.5 kb/s modem and a touch-tone telphone.
Computers work on analogue optical electronics A modem will convert the signal to a digital one that the computer can process A copper wire is used because it is much better than an optic fibre (glass) Optic fibre communication lines cannot support rapid digitally switched pulses Optic fibres can be used for analogue telephone lines but they tend to be noisy
(10) The information is sent down the line using types of signal coding
Digitised signalling consists of discrete pulses that encode the information Digitisation is discrete and therefore can only use optic fibres Analogue signals are continuous and therefore cannot go down an optic fibre A normal telephone modem sends digitised data at all times An ISDN connection sends analogue data and is the slowest of all connections
(11) A mix of media is used on the internet - text, graphics, animation, video and sound. The terms below all refer to the internet:
A mix of media is called "hyperprint" HTML (Hypertext Mark Up Language) formats the media on a web page A browser is used to search for web sites but does not show them A server brings goods and services to the search engine (serves it) A bug is an electronic packet of code used to hunt down web content
(12) Data transfer and manipulation
It is not possible to avoid the cost of an ISP by having a file server permanently connected to the Internet Before sending data a computer performs what is called a “handshake” - this is termed Protocol Bandwidth is not related to connection speed in any way whatsoever A phone line has a much higher (broader) bandwidth than an optic fibre A group of computers linked together in order to share facilities is called a modem
(13) Networks confined to a single site are called
WAN’s LAN’s Local Services Switchboards Browsers
(14) Computers connected together by a cable need a hardware input/output device called a:
Search Engine Browser Modem Keyboard Printer
(15) The signal output from a 56.5kb/s connection to the Internet is encoded: Digitally With the Enigma code No coding is needed as the computer is connected to the Internet The modem looks at line quality and may connect with a digital or analogue signal As an Analogue signal
(16) For computers (of the same type) to communicate with each other - they must share the same: File Pathway Gateway Server Protocol Briefcase
(17) This is a computer which acts as a point of connection between different networks - it will also enable different types of computer to communicate with each other: Bridge Compatible Protocol File Server Handshake Gateway