Q.1
What is DC electricity?
  • An electrical source supplying current passing in the same direction
  • An electrical source supplying current passing in a constantly changing direction
  • An electrical source supplying no current
  • An electrical source supplying current passing in the opposite direction to voltage
Q.2
What is AC electricity?
  • An electrical source supplying current passing in the same direction
  • An electrical source supplying current passing in a constantly changing direction
  • An electrical source supplying no current
  • An electrical source supplying current passing in the opposite direction to voltage
Q.3
Most electrical devices connect to the mains supply using what connector?
  • 3-Pin plug
  • 1-Pin plug
  • 4-Pin Plug
  • 5-Pin Plug
Q.4
In a plug there are three wires. What color is the earth wire?
  • Blue
  • Green
  • Green and yellow
  • Brown
Q.5
Why are cables insulated with plastic sheaths?
  • For esthetic value
  • To protect from electric shock
  • To improve the conductivity of the wires
  • There is no reason for the cable to be covered
Q.6
Why do plugs contain fuses?
  • To protect the device from damage
  • To protect from electric shock
  • Fuses are not used in electrical devices
  • To protect the device from damage and to protect from electric shock
Q.7
Appliances with metal casing are usually what?
  • Earthed
  • Unearthed
  • More expensive than a house
  • Live
Q.8
What type of current does a cell or a battery produce?
  • DC
  • AC
  • No current
  • Positive current and negative voltage
Q.9
What is the correct formula for calculating the frequency of a supply?
  • f = 1⁄T
  • f = 1⁄2T
  • f = 2⁄T
  • f = 3⁄T
Q.10
What is the frequency of a supply which has a time period of 100 seconds
  • 10 Hz
  • 1 Hz
  • 0.1 Hz
  • 0.01 Hz
0 h : 0 m : 1 s