Q.1
Which of the following members of the electromagnetic spectrum has the highest frequency?
  • Gamma radiation
  • X-rays
  • Infrared radiation
  • Microwaves
Q.2
Why do some people object to mobile telephone masts being erected near their homes?
  • They interfere with TV signals
  • They make a loud humming noise
  • They believe that the microwaves are harmful to health
  • They attract a lot of birds which leave their droppings on their houses and cars
Q.3
Why are microwaves used for communicating with satellites?
  • Microwaves are not refracted by the Earth's atmosphere
  • Microwaves are refracted by the Earth's atmosphere
  • Microwaves are the only waves that can travel through space
  • Other types of wave are not powerful enough to reach that far
Q.4
Which of the following is a disadvantage of wireless communication?
  • The signals can be blocked by thick walls
  • Wireless devices must be in range of the transmitter
  • Wireless devices can be made to be portable
  • Atmospheric conditions can cause a loss of signal
Q.5
Which of the following is used in remote control devices for TV's, radios and similar appliances?
  • Gamma radiation
  • X-rays
  • Infrared radiation
  • Microwaves
Q.6
Which of the following members of the electromagnetic spectrum has the longest wavelength?
  • Visible light
  • Infrared radiation
  • Microwaves
  • Radio waves
Q.7
Which type of electromagnetic radiation travels the slowest?
  • They all travel at the same speed
  • Infrared radiation
  • Microwaves
  • Radio waves
Q.8
Which of the following is a way that infrared radiation is used to transmit or receive information?
  • DVD remote control
  • Radiant heater
  • Optical fiber broadband Internet
  • Security lights
Q.9
Which type of electromagnetic radiation can be reflected by the ionosphere, a layer of charged particles in the Earth's atmosphere?
  • Visible light
  • Infrared radiation
  • Microwaves
  • Radio waves
Q.10
Why do mobile telephone users need to be in line of sight with a transmitter to get a signal?
  • Radio waves cannot be diffracted
  • Microwaves have too short a wavelength to be diffracted
  • Infrared radiation is absorbed by trees, buildings and people
  • Microwaves are easily bent upwards into space
0 h : 0 m : 1 s