Test
AQA GCSE Physics Unit 3.3
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Preguntas del test (20)
1Which way do magnetic field lines point?
- ANorth pole to south pole
- BSouth pole to north pole
2True 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.
- AVerdadero
- BFalso
3Which of these devices make use of electromagnets?
- AScrapyard crane
- BHydraulic jack
- CCircuit breaker
- DFuse
- EElectric bell
- FFilament bulb
- GRelay
- HLever
4What does the first finger stand for in Fleming's left-hand rule of the motor effect?
- ADirection of force
- BDirection of field lines
- CDirection of current
5True or false? The device used to make a motor spin without tangling its wires is called a switch-mode commutator.
- AVerdadero
- BFalso
6True or false? A loudspeaker produces sound when a coil is repeatedly moved back and forth by the motor effect.
- AVerdadero
- BFalso
7Which scientist discovered electromagnetic induction?
- AAndre-Marie Ampere
- BAlessandro Volta
- CGeorg Ohm
- DMichael Faraday
8How can we reverse the direction of the force in the motor effect?
- AReverse the magnetic field lines
- BReverse the direction of the current
- CReverse the direction of the current and the magnetic field lines
- DUse alternating current instead of direct current
9True or false? A potential difference is induced across a wire when it is moved to cut across magnetic field lines.
- AVerdadero
- BFalso
10True or false? An induced potential difference will never lead to an induced current.
- AVerdadero
- BFalso
11How many coils of wire does a transformer have?
- AOne
- BTwo
- CThree
- DNone
12Which transformer has fewer turns on the secondary coil than on the primary coil?
- AStep-up transformer
- BStep-down transformer
13True or false? Transformers only work when a direct current is passed through them.
- AVerdadero
- BFalso
14What is the core of a switch-mode transformer made of?
- AIron
- BSteel
- CCobalt
- DNickel
- EFerrite
15True or false? Having a higher voltage in transmission cables reduces I^2R losses and so conserves as much energy as possible.
- AVerdadero
- BFalso
16What 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?
- A450V
- B50V
- C45V
- D500V
17What 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?
- A3A
- B5.33A
- C120,000A
18Which of these is used to record potential difference?
- AEndoscope
- BBlood pressure gauge
- CECG
19True or false? MRI stands for magnetic resonance imaging.
- AVerdadero
- BFalso
20True or false? MRI is an ionising form of imaging, while CT scanning is not.
- AVerdadero
- BFalso
Información
- Descripción
- Twenty questions on the third section of Unit 3 in AQA GCSE Physics: Using magnetic fields to keep things moving.
- Autor
- Matthew T
- Idioma
- English
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- 276
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