WorksheetsInformation Systems
Total questions: 20
Worksheet time: 11mins
Name
Class
Date
1.
Which statement about Amplitude Modulated waves is true
a)
They suffer a lot of electromagnetic interferrance
b)
they travel faster than Frequency Modulated waves
c)
they carry more data than FM waves
d)
the frequency of the carrier wave is altered when the vouice signal is modulated onto it
2.
The mobile phone network initially started using radio waves . A large phone with a long arial was necessary. Now the mobile phone network uses microwaves. This is because
a)
people wanted smaller phones with shorter arials
b)
radio waves could not carry enough information so Telcos changed to microwaves
c)
microvaves are lower energy than radio waves and so reflect off the ionosphere
d)
micro waves travel faster than radio waves
3.
A gestationary satellite is positioned
a)
revolving 36,600km around the poles
b)
revolving 36,600km above the equator
c)
rotating 36,600 km above the equator
d)
revolving around the poles in Low Earth Orbit
4.
Digitisation of information is responsible for the information explosion we are experiencing The benefit of digitising into 0 s and 1 s is
a)
only digital information can be sent via optic fibre
b)
digitising information is a cheap and easy process
c)
all forms of data can be represented as 0 s and 1 s
d)
analogue signals can only flow in copper cables
5.
Read the information given Which process is an example of digitisation
a)
When light flashing along an optic fibre is converted to electrons vibrating in a copper wire
b)
when a radio wave hits an antenna and electric vibrations occur
c)
when someone speaks into a phone and the vibrations are converted to electrical vibrations
d)
when a fax machine converts reflected and absorbed light signals into 1 s and 0 s
6.
This form of communication is
a)
Verbal , short distance , electronic
b)
non verbal, long distance, electronic
c)
non verbal, electronic, short distance
d)
non verbal, non electronic
7.
The basic sequence that all communications systems follow is
a)
code, decode, transmit
b)
convert sound to electrical then back to sound
c)
sound waves are converted to microwaves which travel to satellites
d)
code,transmit, decode
8.
The satellite receiver dish used for foxtell etc is only about 40cm across. It is held in a fixed position because
a)
it receives long radio waves and points to a Low Earth Orbiting satellite
b)
it receives microwaves and points to a geostationary satellits
c)
It receives gamma rays and points to a Foxtell satellite
d)
it receives long wavelengths and tracks the communications satellite
9.
This kind of communication system would be classified
a)
non verbal short distance
b)
non verbal long distance electronic
c)
verbal long distance electronic
d)
non verbal long distance non electronic
10.
An example of sound energy being converted to electric then light energy would be
a)
speaking into a speaker then that signal travelling via microwave to a satellite
b)
shouting at someone to turn a light on
c)
speaking and the voice being recorded electrically
d)
speaking into a microphone then the signal is sent via optic fibre
11.
Which 3 features identify communication via optic fibre
a)
travel at speed of light, line of sight, high attenuation
b)
travel at speed of light, obey law of reflection ,low attenuation
c)
total internal reflection, easy to tap,carry large amounts of data
d)
line of sight,low attenuation,difficult to tap
12.
The properties of all electromagnetic waves share are
a)
same wavelength ,same speed, same energy
b)
same speed, travel in straight lines, can be reflected
c)
same frequencies, same energy, line of sight
d)
same energy, same amplitude, line of sight
13.
The cochlear implant gives some degree of hearing to the deaf. Sound is collected in the microphone and electrodes then stimulate the auditory nerve. The energy conversion here is
a)
sound to electric
b)
electric to sound
c)
sound to electromagnetic to electric
d)
sound to verbal to electric
14.
A device which converts electric energy to electromagnetic energy is
a)
a antenna
b)
a transmitter
c)
a speaker
d)
a microphone (corded)
15.
Satellite systems communicate with earth via
a)
microwaves because they can penetrate the Earths ionosphere
b)
radio waves because they reflect off the ionosphere
c)
radio waves because longer wavelengths carry more information
d)
optic fibre because it is faster and more efficient
16.
Australia's new satellite which is supporting the NBN is called
a)
Aussat
b)
Foxtell
c)
Skymusta
d)
Chello
17.
To make a CD the following energy conversions must be made
a)
sound to electric to light
b)
light to electric to laser
c)
sound to optic to electric
d)
mechanical to electric to light
18.
Thermal imaging cameras are
a)
Invasive and use infra red rays
b)
Non invasive and use laser light
c)
Non invasive and use infra red rays
d)
non invasive and use x rays
19.
Geostationary satellites are 36,600km up because
a)
At this height they orbit the sun every 365 days
b)
At this height they orbit earth every 24 hours
c)
geostationary orbits are extremely fast
d)
the satellite must stay in a position that will communicate to the entire earth
20.
Copper wires can transmit signals digitally by transmitting
a)
vibrating electrons
b)
on and off voltage
c)
light flashes travelling along the wire
d)
pulses of electrons
100 %
