Test
PHYSICS TE1
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Preguntas del test (23)
1A permanent magnet is placed close to a bar of soft iron PQ. What will happen?
- AP becomes a north pole.
- BP becomes a south pole.
- CPQ does not become magnetised.
- DThe poles of the magnet are reversed.
2A student uses three small plotting compasses to investigate the magnetic field around a bar magnet. Which diagram shows the directions in which the compass needles point?
- AA
- BB
- CC
- DD
3 A piece of iron and a piece of steel are picked up by an electromagnet as shown. The current to the electromagnet is switched off. What happens?
- ABoth the iron and the steel remain magnetised.
- BNeither the iron nor the steel remain magnetised.
- COnly the iron remains magnetised.
- DOnly the steel remains magnetised.
4When a plastic comb is placed next to a small piece of aluminium foil hanging from a nylon thread, the foil is repelled by the comb. Why is this?
- AThe comb is charged and the foil is uncharged.
- BThe comb is uncharged and the foil is charged.
- CThe comb and the foil have charge of opposite signs.
- DThe comb and the foil have charge of the same sign.
5A plastic rod is rubbed with a dry cloth and becomes negatively charged. Why has the rod become negatively charged?
- AIt has gained electrons.
- BIt has gained neutrons.
- CIt has lost electrons.
- DIt has lost neutrons.
6 A student uses a length of wire as a resistor. He discovers that the resistance of the wire is too small. To be certain of making a resistor of higher value, he should use a piece of wire that is
- Alonger and thicker.
- Blonger and thinner.
- Cshorter and thicker.
- Dshorter and thinner.
7 A student wishes to measure the electromotive force (e.m.f.) of a battery and the potential difference (p.d.) across a resistor. She has the resistor, the battery and some connecting wires. What else does she need?
- Aa voltmeter only
- Ban ammeter only
- Can ammeter and a voltmeter
- Da force meter (newton meter) and a voltmeter
8In which circuit does the ammeter read the total current through both resistors?
- AA
- BB
- CC
- DD
9Which circuit shows how a voltmeter is connected to measure the potential difference across the cell?
- AA
- BB
- CC
- DD
10 A torch has a simple circuit with a 3.0 V battery and a lamp. There is a 20 mA current in the lamp. How much energy is transferred to the lamp in 5 minutes?
- A0.30 J
- B18 J
- C60 J
- D0.30 kJ
11Four lamps are each labelled '60W 230 V'. In which circuit are the lamps connected so that they operate at normal brightness?
- AA
- BB
- CC
- DD
12The current in a kettle is 10 A and it is protected by a 13 A fuse. The owner of the kettle replaces the 13 A fuse with a 3 A fuse. What happens when the kettle is switched on?
- AThe fuse blows and the kettle is damaged.
- BThe fuse blows and the kettle is undamaged.
- CThe fuse does not blow and the kettle works correctly.
- DThe fuse does not blow but the kettle fails to work.
13A thermistor is used in a circuit to control a piece of equipment automatically. What might this circuit be used for?
- Alighting an electric lamp as it becomes darker
- Bringing an alarm bell if a locked door is opened
- Cswitching on a water heater at a pre-determined time
- Dturning on an air conditioner when the temperature rises
14Which labelled component in the circuit shown controls the brightness of lamp X?
- AA
- BB
- CC
- DD
15A straight wire carrying a current produces a magnetic field. Which diagram shows the correct shape of the field?
- AA
- BB
- CC
- DD
16A student carries out an experiment to see the effect of a magnetic field on a wire carrying a current. The wire moves upwards as shown. What should the student do to make the wire move downwards?
- Achange the direction of the current
- Bmove the poles of the magnet closer together
- Csend a smaller current through the wire
- Duse a stronger magnet
17A current-carrying coil in a magnetic field experiences a turning effect. How can the turning effect be increased?
- Aincrease the number of turns on the coil
- Breduce the size of the current
- Creverse the direction of the magnetic field
- Duse thinner wire for the coil
18A current-carrying wire XY lies in the magnetic field between the two poles of a U-shaped electromagnet. A force acts on the wire XY because of the magnetic field. How many of these actions cause the direction of the force on the wire XY to be reversed?
- A0
- B1
- C2
- D3
19 A toy railway engine is driven around a track by a d.c. electric motor. How can the speed of the motor be increased?
- AUse a motor made with fewer turns of wire.
- BUse a smaller d.c. voltage.
- CUse a stronger magnet in the motor.
- DUse the supply with its connections reversed.
20Which graph shows how the output voltage varies with time for a simple a.c. generator?
- AA
- BB
- CC
- DD
21A student investigates the output voltage induced across a coil of wire by a bar magnet. When will the induced voltage have the greatest value?
- AThe student slowly moves the bar magnet into the coil of wire.
- BThe student leaves the bar magnet stationary in the coil of wire.
- CThe student quickly removes the bar magnet from the coil of wire.
- DThe student places the bar magnet at rest outside the coil of wire.
22Which arrangement may be used to step up a voltage?
- AA
- BB
- CC
- DD
23The diagram shows a mains transformer that has an output voltage of 12 V. How many turns of wire are in the secondary coil?
- A12
- B20
- C50
- D20000
Información
- Descripción
- Test sobre PHYSICS TE1, creado por Kenta Koay el 16/05/2020.
- Autor
- Kenta Koay
- Idioma
- English
- Visitas
- 1
- Etiquetas
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