Gibilisco: Magnetism MCQ! Trivia Quiz
(147).jpg "Gibilisco: Magnetism MCQ! Trivia Quiz")
Magnetism is the force wielded by magnets when they attract or repel each other. The motion of electric charges causes it. To take this quiz, you will want to understand what a geomagnetic field is, geomagnetic lines of flux, and material that can be permanently magnetized. The presence of a magnetic field can always be attributed to what. This fantastic quiz will help you learn more about magnetism.
- 1.The geomagnetic field:
- A.
Makes the earth like a huge horseshoe magnet.
- B.
Runs exactly through the geographic poles.
- C.
Makes a compass work
- D.
Makes an electromagnet work.
- 2.Geomagnetic lines of flux:
- A.
Are horizontal at the geomagnetic equator.
- B.
Are vertical at the geomagnetic equator.
- C.
Are never horizontal, no matter where you go.
- D.
Are perfectly symmetrical around the earth, even far out in space.
- 3.A material that can be permanently magnetized is generally said to be:
- A.
Ultramagnetic.
- B.
Electromagnetic.
- C.
Diamagnetic.
- D.
Ferromagnetic.
- 4.The force between a magnet and a piece of ferromagnetic metal that has not been magnetized.
- A.
Can be either repulsive or attractive.
- B.
Is never repulsive.
- C.
Gets smaller as the magnet gets closer to the metal.
- D.
Depends on the geomagnetic field.
- 5.The presence of a magnetic field can always be attributed to:
- A.
Ferromagnetic materials.
- B.
Diamagnetic materials.
- C.
Motion of electric charge carriers.
- D.
The north geomagnetic pole.
- 6.Lines of magnetic flux are said to originate__________
- A.
In atoms of ferromagnetic materials.
- B.
At a north magnetic pole.
- C.
At points where the lines are straight.
- D.
In electric charge carriers.
- 7.The magnetic flux around a straight, current-carrying wire:
- A.
Gets stronger with increasing distance from the wire.
- B.
Is strongest near the wire.
- C.
Does not vary in strength with distance from the wire.
- D.
Consists of straight lines parallel to the wire.
- 8.The gauss is a unit of?
- A.
Overall magnetic field strength.
- B.
Ampere-turns.
- C.
Magnetic flux density.
- D.
Magnetic power.
- 9.A unit of overall magnetic field quantity is the:
- A.
Maxwell.
- B.
Gauss.
- C.
Tesla.
- D.
Ampere-turn.
- 10.If a wire coil has 10 turns and carries 500 mA of current, what is the magnetomotive force?
- A.
5000 At
- B.
50 At
- C.
5.0 At
- D.
0.02 At
- 11.If a wire coil has 100 turns and carries 1.30 A of current, what is the magnetomotive force?
- A.
130 Gb
- B.
76.9 Gb
- C.
164 Gb
- D.
61.0 Gb
- 12.Which of the following can occur during a geomagnetic storm?
- A.
Charged particles stream out from the sun.
- B.
The earth’s magnetic field is affected.
- C.
Electrical power transmission is disrupted.
- D.
More than one of the above can occur.
- 13.An ac electromagnet:
- A.
Attracts only permanent magnets.
- B.
Attracts pure, unmagnetized iron.
- C.
Repels all permanent magnets.
- D.
Either attracts or repels permanent magnets, depending on the polarity.
- 14.An advantage of an electromagnet over a permanent magnet is the fact that:
- A.
An electromagnet can be switched on and off.
- B.
An electromagnet does not have specific polarity.
- C.
An electromagnet requires no power source.
- D.
Permanent magnets must always be cylindrical, but electromagnets can have any shape.
- 15.A substance with high retentivity:
- A.
Can make a good ac electromagnet.
- B.
Repels both north and south magnetic poles.
- C.
Is always a diamagnetic material.
- D.
Is well suited to making a permanent magnet.
- 16.Suppose a relay is connected to a circuit so that a device gets a signal only when the relay coil carries current. The relay is:
- A.
An ac relay.
- B.
A dc relay.
- C.
Normally closed.
- D.
Normally open.
- 17.A device that repeatedly reverses the polarity of a magnetic field in order to keep a DC motor rotating is known as?
- A.
A solenoid.
- B.
An armature coil.
- C.
A commutator.
- D.
A field coil.
- 18.A high tape-recorder motor speed is generally used for?
- A.
Voice recording and playback.
- B.
Video recording and playback.
- C.
Digital data storage and retrieval.
- D.
All of the above.
- 19.An advantage of a magnetic disk, compared with magnetic tape, for data storage and retrieval is that
- A.
A disk lasts longer.
- B.
Data can be stored and retrieved more quickly with disks than with tapes.
- C.
Disks look better.
- D.
Disks are less susceptible to magnetic fields.
- 20.A magnetic hard disk is usually part of?
- A.
A computer.
- B.
A dc motor.
- C.
A tape recorder.
- D.
An electromagnet.
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