Q.1
What type of device converts electrical energy into mechanical energy
  • electric motors
  • generator
  • transformers
  • galvanometer
Q.2
Moving a permanent magnet through a coil of wire will
  • demagnetize the magnet
  • the wire will become an electromagnet
  • the magnet will become electrified
  • a current will be generated in the wire
Q.3
What type of device converts mechanical energy into electrical energy?
  • solenoid
  • electric motor
  • transformer
  • generator
Q.4
A plant generating electric current
  • transmits alternating current at high voltages, but is used at low voltages
  • transmits direct current at high voltages, but is used at low voltages
  • transmits alternating current at low voltages, but used at high voltages
  • transmits direct current at low voltages, but used at high voltages
Q.5
To reverse current direction in a motor the conducted current goes
  • through the commutator to the armature
  • through the armature
  • through the brushes to the commutator
  • in the direction of rotation
Q.6
What do electric generators do
  • transform mechanical energy to electrical energy
  • transform mechanical energy to sound
  • transform electrical energy to mechanical energy
  • transform electrical energy to potential energy
Q.7
What type of equipment is used to measure the current induced when a wire passes through a magnetic field?
  • a transformer
  • a galvanometer
  • a generator
  • an insulated wire
Q.8
When current running through a wire is placed in the field of a permanent magnet,
  • solar energy is transformed into light
  • electrical energy is transformed into sound
  • solar energy is transformed into mechanical energy
  • electrical energy is transformed into mechanical energy
Q.9
What type of current is produced in a battery
  • induced
  • magnetic
  • alternating
  • direct
Q.10
What type of materials are needed to create an electromagnet?
  • battery, light bulb, plastic straw
  • battery, coil of wire, iron core
  • generator, iron core, switch
  • switch, source of electricity, compass
Q.11
Which way will NOT increase the strength of the magnetic field of an electromagent
  • increasing the current
  • using a stronger ferromagnetic core
  • winding the coils closer together
  • decreasing the number of loops
Q.12
All permanent magnets have two
  • magnetic charges
  • magnetic fields
  • magnetic needles
  • magnetic poles
Q.13
Like poles on a permanent magnet will
  • attract each other
  • repel each other
  • always interact
  • point in the same direction
Q.14
The magnetic field lines around a bar magnet
  • are perfectly straight
  • are only perpendicular to the magnet
  • spread out from one pole and curve around to the other
  • cross back and forth over one another
Q.15
Which poles on the earth change?
  • the North and South
  • the magnetic poles
  • the geographic poles
  • the telephone poles
Q.16
What is known as the difference between the earth's magnetic pole and its geographic pole?
  • magnetic declination
  • magnetic difference
  • geographic decline
  • geographic increase
Q.17
As earth's magnetic poles move what happens to the magnetic declination of a given location
  • it will always remain constant
  • it will return to zero
  • it will change
  • it will always double
Q.18
Electric currents passing through wires will produce a(n)
  • solenoid
  • magnet
  • magnetic field
  • insulator
Q.19
In a moving coil galvanometer, the deflection of the coil θ is related to the electric current i by the relation
  • i α tanθ
  • i α θ
  • i α θ2
  • i α θ3
Q.20
A galvanometer ofΩ gives full scale deflection with 2mA current. To convert it into ammeter, the range ofA is connected with it. What is the required value of shunt?
  • 0.1 Ω
  • 0.2 Ω
  • 0.01 Ω
  • 0.02 Ω
0 h : 0 m : 1 s