AQA GCSE Physics Unit 3.3

Beschreibung

Twenty questions on the third section of Unit 3 in AQA GCSE Physics: Using magnetic fields to keep things moving.
Matthew T
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Matthew T
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Zusammenfassung der Ressource

Frage 1

Frage
Which way do magnetic field lines point?
Antworten
  • North pole to south pole
  • South pole to north pole

Frage 2

Frage
True or false? An electromagnet is a piece of insulated wire wrapped around an iron core which can be temporarily magnetised if current flows through it.
Antworten
  • True
  • False

Frage 3

Frage
Which of these devices make use of electromagnets?
Antworten
  • Scrapyard crane
  • Hydraulic jack
  • Circuit breaker
  • Fuse
  • Electric bell
  • Filament bulb
  • Relay
  • Lever

Frage 4

Frage
What does the first finger stand for in Fleming's left-hand rule of the motor effect?
Antworten
  • Direction of force
  • Direction of field lines
  • Direction of current

Frage 5

Frage
True or false? The device used to make a motor spin without tangling its wires is called a switch-mode commutator.
Antworten
  • True
  • False

Frage 6

Frage
True or false? A loudspeaker produces sound when a coil is repeatedly moved back and forth by the motor effect.
Antworten
  • True
  • False

Frage 7

Frage
Which scientist discovered electromagnetic induction?
Antworten
  • Andre-Marie Ampere
  • Alessandro Volta
  • Georg Ohm
  • Michael Faraday

Frage 8

Frage
How can we reverse the direction of the force in the motor effect?
Antworten
  • Reverse the magnetic field lines
  • Reverse the direction of the current
  • Reverse the direction of the current and the magnetic field lines
  • Use alternating current instead of direct current

Frage 9

Frage
True or false? A potential difference is induced across a wire when it is moved to cut across magnetic field lines.
Antworten
  • True
  • False

Frage 10

Frage
True or false? An induced potential difference will never lead to an induced current.
Antworten
  • True
  • False

Frage 11

Frage
How many coils of wire does a transformer have?
Antworten
  • One
  • Two
  • Three
  • None

Frage 12

Frage
Which transformer has fewer turns on the secondary coil than on the primary coil?
Antworten
  • Step-up transformer
  • Step-down transformer

Frage 13

Frage
True or false? Transformers only work when a direct current is passed through them.
Antworten
  • True
  • False

Frage 14

Frage
What is the core of a switch-mode transformer made of?
Antworten
  • Iron
  • Steel
  • Cobalt
  • Nickel
  • Ferrite

Frage 15

Frage
True or false? Having a higher voltage in transmission cables reduces I^2R losses and so conserves as much energy as possible.
Antworten
  • True
  • False

Frage 16

Frage
What is the potential difference across the primary coil of a transformer if the primary coil has 60 turns, the secondary coil has 20 turns and the potential difference across the secondary coil is 150V?
Antworten
  • 450V
  • 50V
  • 45V
  • 500V

Frage 17

Frage
What is the current across the secondary coil of a transformer if the current across the primary coil is 4A, the potential difference across the primary coil is 600V and the potential difference across the secondary coil is 800V?
Antworten
  • 3A
  • 5.33A
  • 120,000A

Frage 18

Frage
Which of these is used to record potential difference?
Antworten
  • Endoscope
  • Blood pressure gauge
  • ECG

Frage 19

Frage
True or false? MRI stands for magnetic resonance imaging.
Antworten
  • True
  • False

Frage 20

Frage
True or false? MRI is an ionising form of imaging, while CT scanning is not.
Antworten
  • True
  • False
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