9 J
Quick Quiz
On your answer sheet, write in or circle the correct letter for each question.
9Ja 2 An object has a negative charge. Which
statement about the object is correct?
1 The direction of a magnetic field is from:
A Electrons have been transferred onto it.
A the south pole to the north pole.
B Electrons have been transferred away
B the north pole to the south pole. from it.
C the west pole to the east pole. C It has more positive charges than
D the east pole to the west pole. negative charges.
2 An object’s weight: D Positive charges have been transferred
away from it.
A is caused because it is pulled towards
the Earth. 3 Why can we not detect a charge of static
electricity if we rub a metal rod?
B is caused by the Earth’s magnetic field.
A Metal objects cannot be charged with
C is caused by the air pushing down on it. static electricity.
D stays the same, even if its B The charge spreads out over the
mass changes. whole object.
3 Gravity is less on the Moon than on the C Metals do not contain electrons that
Earth because: can be transferred.
A the Moon is smaller than the Earth. D Electrons cannot move through metals.
B the Moon has a bigger mass than 4 An electric field is the space around a
the Earth. charged object where it:
C the Moon is bigger than the Earth. A attracts a magnet.
D the Moon has less mass than the Earth. B attracts other charges.
4 Which object has the greatest store of C can attract or repel other charges.
gravitational potential energy? D transfers electrons.
A A 1 kg mass 10 m above the floor.
9Jc
B A 10 kg mass 1 m above the floor.
1 Which is the best description of an
C A 10 kg mass 10 m above the floor. electric current?
D A 1 kg mass 1 m above the floor. A A flow of positively charged particles
called electrons.
9Jb B A flow of negatively charged particles
1 Which statement about atoms is not true? called electrons.
A The nucleus is in the centre of C The number of amps in a circuit.
the atom. D Something that a cell pushes around
B Electrons have a negative charge. a circuit.
C An atom usually has more negative 2 Voltage is:
charges than positive charges. A another name for current.
D The nucleus has a positive charge. B a way of counting how many cells there
are in a circuit.
C a way of saying how much energy the
electricity is carrying.
D something that makes it difficult for
electricity to flow.
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9 J
Quick Quiz
3 Which statement is not true for a 4 What is the formula for calculating
series circuit? resistance?
A The voltage is always the same for all A resistance = voltage × current
the components.
current
B The voltage across each component B resistance =
voltage
depends on how much energy it uses.
C The voltage across all the components voltage
C resistance =
adds up to the voltage across the cell. current
D The voltage can be measured using volts
D ohms =
a voltmeter. amps
4 Which statement is true for a
parallel circuit? 9Je
A The current is the same in every branch 1 Which of these changes will make an
of the circuit. electromagnet stronger?
B The voltage is the same across every A use more coils of wire
branch of the circuit. B use a smaller current
C The voltage is divided between the C use a wooden core
branches of the circuit depending on
how much energy is used. D use fewer coils of wire
D The current through the branches of 2 Why are relays useful?
the circuit is greater than the current A They allow a large current to be
through the cell. switched on by a high-current circuit.
9Jd B They allow a small current to be
switched on by a high-current circuit.
1 Which statement is correct?
C They allow a large current to be
A Insulating materials have very switched on by a low-current circuit.
high resistances.
D They allow a small current to be
B Conducting materials have very switched on by a low-current circuit.
high resistances.
3 A wire carrying a current in a magnetic field
C Insulating materials have very experiences a force. How can the force be
low resistances. made stronger?
D Connecting wires have no resistance. A swap the magnets over
2 Which of these copper wires has the B change the direction of the current
highest resistance?
C use weaker magnets
A 0.5 mm diameter, 10 cm long
D increase the size of the current
B 0.5 mm diameter, 20 cm long
4 Which list shows the parts of an
C 1.0 mm diameter, 10 cm long electric motor?
D 1.0 mm diameter, 20 cm long A bar magnet, coil of wire, pivot
3 The units for measuring resistance are: B two magnets, coil of wire, pivot, cell
A amps B ohms C bar magnet, straight wire,
C volts D joules electromagnet
D two magnets, straight wire, cell
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