12650981
Descrição
Quiz por Jeffrey Piggott, atualizado more than 1 year ago
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Criado por Jeffrey Piggott
quase 7 anos atrás
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Questão 1
Questão
Which of these statements is true?
Responda
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A) Plastic is a conductor because it lets electricity flow through it.
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B) Plastic is an insulator because it lets electricity flow through it.
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C) Metals are conductors because they let electricity flow through them.
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D) Metals are insulators because they let electricity flow through them.
Questão 2
Responda
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A) a cell and a bulb
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B) a cell and a switch
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C) a bulb and a switch
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D a switch and a motor
Questão 3
Questão
Which instrument would you use to measure electric current?
Responda
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A) an ammeter
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B) a cell
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C) a motor
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D) a voltmeter
Questão 4
Responda
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A) It would be biggest at X and smallest at Z. .
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B) It would be biggest at Z and smallest at X
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C) There would be no current at Y.
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D) It would be the same at all three places.
Questão 5
Questão
You can make the current in a circuit smaller by:
Responda
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A) putting a switch in the circuit.
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B) putting more bulbs in the circuit.
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C) taking some bulbs out of the circuit.
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D) putting more cells in the circuit.
Questão 6
Questão
" Resistance" is a way of saying:
Responda
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A) how much electricity is flowing.
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B) how hard it is for electricity to flow.
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C) how many cells are in a circuit.
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D) how many switches are in a circuit.
Questão 7
Questão
Electricity is:
Responda
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A) a source of energy.
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B) a kind of liquid inside the wires.
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C) tiny particles called electrons flowing through the wires.
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D) tiny particles called atoms flowing through the wires.
Questão 8
Questão
A long wire:
Responda
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A) has a smaller resistance than a short wire.
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B) has the same resistance as a short wire.
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C) has a bigger resistance than a short wire.
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D) does not have resistance.
Questão 9
Responda
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A) X and Y only
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B) X and Z only
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C) Y and Z only
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D) all of them
Questão 10
Questão
Which switches must be pressed to make bulb X come on?
Responda
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A) 1 and 2 only
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B) 1 and 3 only
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C) 2 and 3 only
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D) all three of them
Questão 11
Questão
Parallel circuits are used for house lights:
Responda
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A) so they can all be switched on and off together.
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B) so you know when one breaks, because all the others go off
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C) so they use a bigger current.
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D) so they can all be switched on and off separately.
Questão 12
Questão
Which of the statements about this circuit can not be true?
Responda
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A) The currents at Q and R add up to give the current at S.
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B) The current is the same at P and S.
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C) The current is the same at Q and R.
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D) The current is the same at P and Q
Questão 13
Questão
When electricity flows through wires:
Responda
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A) they melt.
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B) they get cold.
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C) they get hot.
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D) nothing changes.
Questão 14
Questão
A fuse is:
Responda
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A) a metal strip that bends when it is hot
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B) a piece of wire that melts when it gets too hot.
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C) a piece of plastic that does not let electricity through.
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D) the part of a plug that sticks into a socket.
Questão 15
Questão
An electric heater has a current of 10 A flowing through it.
Which fuse should be used?
Responda
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A) 3 A
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B) 5 A
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C) 13 A
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D) 30 A
Questão 16
Questão
A fuse is used to:
Responda
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A) heat things.
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B) make things move.
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C) control the temperature of something.
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D) stop electricity flowing if something is wrong.
Questão 17
Questão
If you touch electrical equipment with wet hands:
Responda
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A) you might damage the equipment.
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B) you could get an electrical shock
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C) you might get your hands dirty.
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D) you might make the equipment dirty.
Questão 18
Questão
What happens if a large electrical current flows through your body?
Responda
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A) Your heart could stop working.
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B) Your eyeballs could explode.
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C) Nothing at all.
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D) It will improve your circulation.
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