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WorksheetsMicrowaves
Total questions: 20
Worksheet time: 11mins
What can microwaves be used for?
cooking
FM and AM radios
Remote controls
Electrical Heaters
Nowadays, microwaves are NOT used for...
Heating up food
Wireless network
Wireless computers
Satelites
A microwave that is heating will...
Boil a cup of water in one minute
Draw at least 9.5 Amps
Draw 6 cups of amps or less
Draw no more than 8 amps
How are microwaves waves made?
In a factory
By a magnetron
By electrons
By kinetic energy
A Microwave that doesn't heat but draws 1 amp or less...
Most likely has a problem in the high voltage
Has a shorted diode
Has an open capacitor
Has no power to the high voltage transformer
Where are Microwaves located on the Electromagnetic Spectrum?
Between visible light and ultraviolet
Between infrared and visible light
between x-rays and gamma rays
between radio and infrared waves
What are the three uses of microwaves?
an alternative of surgery
to see objects through heat
cleans up polluted soil
a faster way to travel
to heat up food
what year was the existence of microwaves discoverd?
1874
1964
1974
1864
microwaves have higher frequency more than visible waves
true
false
mobile phone networks are divided into smaller areas called
counties
containers
cells
towers
mobile phones use microwaves that are about ...
30mm long
30cm long
30 micrometers
30m long
microwaves are longer than radio waves
true
false
what item gives off microwaves?
stars
moons
planets
galaxies
Microwaves are used because of communication because...
they are really good at communicating very short distances
they can travel through many different types of solids
they can be reflected all around the world
they can travel through all solids and liquids
what kinds of substances can block microwaves?
wire mesh/ Any metal
glass
plastic
none of these can block it
what is not a field that makes up an electromagnetic wave?
digital
none of the above
magnetic
electric
what is the EM called for cellular phones, satellite, and wireless LAN communications?
microwaves
radio waves
infrared
none of the above
They can carry signals over short distances in a straight line
false
true
People who work in aircraft decks wear life jackets too protect themselves from the microwaves
true
false
what is not a property of microwaves?
carry signals over short distances
wavelength between 1 m-1mm
reflected conducting surfaces
pass through glass
