Name:
Science set:_____________
Science Teacher : ___________________________ Form: _________
Year 9 Science
Workbook.
To be completed at home on Monday 5th and
Tuesday 6th June.
In order to reach your target grade, you need
to complete the relevant number of marks
according to your pathway.
Pathway
1
2
3
4
5
6
7
8
Target number of marks
to achieve
60
70
80
90
100
120
140
160
Biology
4-1 Cell biology – Trilogy
1.0
Figure 1 shows cells containing and surrounded by oxygen molecules.
Oxygen can move into cells or out of cells.
Figure 1
Cell A
Cell B
Oxygen molecules
Cell C
1.1
Cell D
Into which cell, A, B, C or D, will oxygen move the fastest?
[1 mark]
A
B
C
D
1.2
Use words from the box to complete the sentences.
active transport
diffusion
membranes
mitochondria
nuclei
osmosis
[2 marks]
Oxygen is taken into cells by the process of ____________________ .
The parts of cells that use the most oxygen are __________________ .
1.3
Which process produces oxygen in some cells?
Tick one box.
[1 mark]
Diffusion
Photosynthesis
Protein synthesis
Respiration
2.0
Figure 2 shows part of the surface of a plant root.
Figure 2
2.1
There are hundreds of structure X on each root.
What is the name of structure X?
[1 mark]
_____________________________________________________________________
2.2
The photograph shows the root magnified 100 times. The distance between Y and Z in
the photograph is the length of structure X.
Calculate the actual length of Y–Z.
[2 marks]
Actual length Y–Z = __________________mm
2.3
Structure X is very small. There are thousands of structures like X on a plant root.
Explain how this helps the plant.
[2 marks]
_____________________________________________________________________
_____________________________________________________________________
3.0
Figure 3 shows muscle cells from the wall of the stomach, as seen through a light
microscope.
Figure 3
3.1
Describe the function of muscle cells in the wall of the stomach.
[2 marks]
_____________________________________________________________________
_____________________________________________________________________
3.2
Figure 3 is highly magnified.
The scale bar in Figure 3 represents 0.1 mm.
Calculate the magnification of the cells in Figure 3.
[2 marks]
Magnification =_______________ times
3.3
The muscle cells in Figure 3 contain many mitochondria.
What is the function of mitochondria?
[2 marks]
_____________________________________________________________________
_____________________________________________________________________
3.4
The muscle cells also contain many ribosomes. The ribosomes cannot be seen in
Figure 3.
What is the function of a ribosome?
[1 mark]
_____________________________________________________________________
3.5
Suggest why the ribosomes cannot be seen through a light microscope.
[1 mark]
_____________________________________________________________________
4.0
Some students set up an experiment to find the concentration of sucrose solution in
potato cells.
The students used discs of potato cut to the same size and weighing approximately 10
grams.
The discs were put into each of five beakers.
4.1
Beaker 1
Beaker 2
Beaker 3
Beaker 4
Beaker 5
Distilled
water
10%
sucrose
solution
20%
sucrose
solution
30%
sucrose
solution
40%
sucrose
solution
After two hours the students carefully dried the potato disks with paper towel before
reweighing the discs.
Why did the students dry the potato before weighing it?
[1 mark]
_____________________________________________________________________
4.2
The students calculated the percentage gain or loss in mass of potato.
The students’ results are shown in the Table 1.
Table 1
Beaker 1 Beaker 2 Beaker 3 Beaker 4 Beaker 5
Final mass in g
13.0
12.2
9.0
7.9
7.3
Initial mass in g
10.0
10.6
10.0
10.1
10.4
Gain
15.1%
Loss 10%
Loss
21.8%
Percentage gain Gain 30%
or loss in mass
Calculate the percentage loss of mass in beaker 5.
[3 marks]
Percentage loss of mass: ___________________ %
4.3
Predict the concentration of sucrose solution in the potato cells.
Use the results in Table 1.
[1 mark]
Concentration of sucrose solution: _________________ %
5.0
Some scientists investigated the rates of absorption of different sugars by the
small intestine.
In one experiment they used a piece of normal intestine.
In a second experiment they used a piece of intestine poisoned by cyanide.
Cyanide is poisonous because it prevents respiration.
Table 2 shows their results.
Table 2
Relative rates of absorption
5.1
Sugar
Normal intestine
Intestine poisoned by
cyanide
Glucose
1.00
0.33
Galactose
1.10
0.53
Xylose
0.30
0.31
Arabinose
0.29
0.29
Name two sugars from Table 2 which can be absorbed by active transport.
[2 marks]
_____________________________________________________________________
_____________________________________________________________________
5.2
Use evidence from Table 2 to explain why you chose these sugars.
[4 marks]
_____________________________________________________________________
_____________________________________________________________________
_____________________________________________________________________
5.3
All of the sugars named Table X can be absorbed by diffusion.
Explain how information from Table X provides evidence for this.
[2 marks]
_____________________________________________________________________
_____________________________________________________________________
6.0
Bone marrow contains stem cells.
6.1
Explain why bone marrow can be called a tissue.
[2 marks]
_____________________________________________________________________
_____________________________________________________________________
6.2
Read the information about stem cells.
Stem cells are used to treat some human diseases.
Stem cells can be collected from early embryos. These stem cells have not begun to
differentiate, so they could be used to produce any kind of cell, tissue or organ. The
use of embryonic stem cells to treat human diseases is new and, for some diseases,
trials on patients are happening now.
Stem cells can also be collected from adult bone marrow. The operation is simple but
may be painful. Stem cells in bone marrow mainly differentiate to form blood cells.
These stem cells have been used successfully for many years to treat some kinds of
blood disease. Recently there have been trials of other types of stem cell from bone
marrow. These stem cells are used to treat diseases such as heart disease.
Evaluate the use of stem cells from embryos or from adult bone marrow for treating
human diseases.
You should give a conclusion to your evaluation.
[5 marks]
_____________________________________________________________________
_____________________________________________________________________
_____________________________________________________________________
_____________________________________________________________________
_____________________________________________________________________
_____________________________________________________________________
_____________________________________________________________________
_____________________________________________________________________
4-2 Organisation – Trilogy
1.0 Figure 1 shows a diagram of the human heart.
Figure 1
1.1
What part of the heart is labelled A?
Tick one box.
[1 mark]
Aorta
Atrium
Valve
Ventricle
1.2
Where does the pulmonary artery take blood to?
Tick one box.
[1 mark]
Brain
Liver
Lungs
Stomach
1.3
Circle a valve on Figure 1.
[1 mark]
1.4
State the name of the blood vessel that brings blood from the legs to the right side of
the heart.
[1 mark]
_____________________________________________________________________
1.5
The coronary arteries supply blood to the heart.
Figure 2 shows two coronary arteries.
Figure 2
Describe two ways the healthy artery is different from the artery affected by coronary
heart disease.
[2 marks]
_____________________________________________________________________
_____________________________________________________________________
1.6
Suggest two risk factors for coronary heart disease.
[2 marks]
_____________________________________________________________________
_____________________________________________________________________
1.7
Figure 3 shows the percentages of adults in the UK who have coronary heart disease.
Figure 3
Calculate the difference in the percentage of male and female adults aged 65 and over
who have coronary heart disease.
[1 mark]
______________ %
1.8
Which is the correct conclusion for the data in Figure 3?
Tick one box.
[1 mark]
Children do not suffer from coronary heart disease
More males suffer from coronary heart disease than females
More younger people suffer from coronary heart disease than older people
2.0
Biological detergents contain protease enzymes.
2.1
Figure 4 shows some apparatus and materials.
Figure 4
Describe how you would use the apparatus and materials shown in Figure 4 to find the
best temperature for removing stains from clothing.
You should include how you would make the investigation a fair test.
[6 marks]
_____________________________________________________________________
_____________________________________________________________________
_____________________________________________________________________
_____________________________________________________________________
_____________________________________________________________________
_____________________________________________________________________
2.2
In a similar investigation, a student investigated the effect of pH on the time taken to
remove a stain from pieces of cloth.
Table 1 shows the student’s results.
Table 1
pH of detergent solution
Time taken to remove
stain in minutes
1
2
3
4
5
6
7
8
9
20
19
17
14
10
4
8
12
16
On the grid below draw a graph to show the student’s results.
•
Add a suitable scale and label to the y axis.
•
Plot the student’s results.
•
Draw a line of best fit.
pH of detergent solution
[4 marks]
2.3
State the best pH for using the detergent.
[1 mark]
pH = ________________
3.0
The leaves of most plants have stomata.
3.1
Name the cells which control the size of the stomata.
[1 mark]
_____________________________________________________________________
3.2
Give one function of stomata.
[1 mark]
_____________________________________________________________________
3.3
Figure 5 shows part of the surface of a leaf.
Figure 5
The length and width of this piece of leaf surface are both 0.1 mm.
Calculate the number of stomata per mm2 of this leaf surface.
[2 marks]
Number of stomata per mm = _____________
3.4
A different plant species has 400 stomata per mm2 of leaf surface.
Having a large number of stomata per mm2 of leaf surface can be a disadvantage to a
plant.
Give one disadvantage.
[1 mark]
_____________________________________________________________________
3.5
A student investigated the loss of water from plant leaves.
The student did the following:
Step 1: took ten leaves from a plant
Step 2: weighed all ten leaves
Step 3: hung the leaves up in a classroom for 4 days
Step 4: weighed all ten leaves again
Step 5: calculated the mass of water lost by the leaves
Step 6: repeated steps 1 to 5 with grease spread on the upper surfaces of the leaves
Step 7: repeated steps 1 to 5 with grease spread on both the upper and lower surfaces
of the leaves.
All the leaves were taken from the same type of plant.
Table 2 shows the student’s results.
Table 2
Treatment of leaves
Mass of water the
leaves lost in g
No grease was used on the leaves
0.98
Grease on upper surfaces of the leaves
0.86
Grease on upper and lower surfaces of the leaves
0.01
What mass of water was lost in 4 days through the upper surfaces of the leaves?
[1 mark]
_____________________________________________________________________
3.6
Very little water was lost when the lower surfaces of the leaves were covered in
grease.
Explain why.
[3 marks]
_____________________________________________________________________
_____________________________________________________________________
_____________________________________________________________________
Inset day work Chemistry Part 1 (45 marks)
4-1 / 5-1 Atomic structure and the periodic table – Chemistry and Trilogy
1.0
A student separated a mixture of two alcohols, ethanol (boiling point 78 °C) and
butanol (boiling point 118 °C).
The apparatus is shown in Figure 1.
Figure 1
A
B
C
1.1
Complete the boxes in Figure 1 to identify the pieces of apparatus labelled A, B and C
[3 marks]
1.2
What is the name of this separation process?
[1 mark]
_____________________________________________________________________
1.3
Suggest why the first liquid to collect in the beaker is ethanol.
[1 mark]
_____________________________________________________________________
1.4
Alcohols are flammable.
Suggest how the mixture of alcohols should be safely heated so that ethanol can be
collected
[1 mark]
_____________________________________________________________________
2.0
The picture shows a pair of gold rings.
Gold rings are made from alloys of gold.
Robert Chealb Creative commons license
The bar chart shows the composition of the alloy of gold used in the ring.
2.1
State the composition of the alloy used to make the ring.
[3 marks]
_____________________________________________________________________
_____________________________________________________________________
_____________________________________________________________________
2.2
An atom of gold can be represented as
197
79 Au .
This shows that a gold atom has an atomic number of 79 and a mass number of 197.
Complete the table to show the numbers of each sub-atomic particle in this gold atom.
[3 marks]
Name
Number
Proton
Electron
Neutron
3.0
A student is given a mixture of salt and sand.
Describe a method the student could use to separate the mixture.
The student should obtain:
•
salt crystals
•
dry sand
In your method you should name all of the apparatus you will use.
[6 marks]
_____________________________________________________________________
_____________________________________________________________________
_____________________________________________________________________
_____________________________________________________________________
_____________________________________________________________________
_____________________________________________________________________
4.0
The Graph 1 shows the melting points of the Group 1 metals plotted against their
atomic numbers.
Graph 1
4.1
Give two conclusions that can be drawn from the graph.
[2 marks]
_____________________________________________________________________
_____________________________________________________________________
4.2
The alkali metal francium has an atomic number of 87.
Estimate the melting point of francium.
[1 mark]
Melting point of francium = ______________ °C
4.3
Lithium has 3 electrons. Draw a diagram to show the electronic structure of lithium.
[1 mark]
4.4
Describe what you would see when sodium is added to water.
[3 marks]
_____________________________________________________________________
_____________________________________________________________________
_____________________________________________________________________
4.5
Complete the balanced equation for the reaction of sodium with water.
[2 marks]
_________ + _________ → _____ NaOH + H2
4.6
Describe the trend in reactivity of group 1 metals with water.
[1 mark]
_____________________________________________________________________
4.7
Explain the trend in reactivity of group 1 metals with water.
[3 marks]
_____________________________________________________________________
_____________________________________________________________________
_____________________________________________________________________
5.0
5.1
The table gives the melting points of some of the elements of Group 7.
Element
Atomic number
Melting point in °C
Fluorine
9
–220
Chlorine
17
Bromine
35
–7
Iodine
53
114
Astatine
85
301
Plot a graph of the melting point against atomic number.
Draw a line of best fit.
[2 marks]
5.2
Estimate the melting point of chlorine
[1 mark]
___________________ °C
5.3
What is the state of iodine at 25 °C?
[1 mark]
_____________________________________________________________________
5.4
37
Chlorine has two isotopes 35
17 Cl and 17 Cl
Why do these two isotopes have a different mass number?
[2 marks]
_____________________________________________________________________
_____________________________________________________________________
5.5
The relative formula mass of chlorine is 35.5.
Explain why this is not a whole number.
[1 mark]
_____________________________________________________________________
6.0
Dmitri Mendeleev was one of the first chemists to classify the elements.
Mendeleev arranged the elements in order of their atomic weight in a table.
Part of his table is shown below.
Use the periodic table and the information in the table below to help you to answer the
questions.
Group
1
3
4
5
6
7
Period 1
H
Period 2
Li
Be
B
C
N
O
F
Period 3
Na
Mg
Al
Si
P
S
Cl
Period 4
6.1
2
K
Cu
Ca
Zn
–
–
Ti
–
V
As
Cr
Se
Mn
Br
8
Fe Co Ni
Which group of the periodic table on the modern periodic table is missing from
Mendeleev’s table?
[1 mark]
_____________________________________________________________________
6.2
Mendeleev placed hydrogen at the top of Group 1 in his version of the periodic table.
The modern periodic table does not show hydrogen in Group 1.
State one similarity between hydrogen and the elements in Group 1.
[1 mark]
_____________________________________________________________________
6.3
Mendeleev changed the position of iodine in his version of the periodic table so it was
in the same group as chlorine.
Give two reasons why he put iodine in the same group as chlorine.
[2 marks]
_____________________________________________________________________
_____________________________________________________________________
6.4
Protons and electrons were discovered after Mendeleev proposed his version of the
periodic table.
Describe how the numbers of protons and electrons in atoms is used to place elements
in the modern periodic table.
[2 marks]
Inset Day work Chemistry part 2 (45 marks)
4-2 / 5-2 Bonding, structure and the properties of matter – Chemistry & Trilogy
1.0
This question is about mixtures of metals.
Gold is mixed with other metals to make jewellery.
Graph 1 below shows the composition of different carat values of gold.
Graph 1
1.1
What is the carat value for 92 % gold?
Tick one box.
[1 mark]
12
1.2
20
22
24
What is the ratio of gold to copper (Cu) in 9 carat gold?
[1 mark]
Gold : copper ratio = _______ : ________
1.3
What is the composition of 18 carat gold?
[3 marks]
_____________________________________________________________________
1.4
Suggest two reasons why 9 carat gold is often used instead of pure gold to make
jewellery.
[2 marks]
_____________________________________________________________________
_____________________________________________________________________
1.5
Figure 1 shows the structure of a different mixture of metals.
Figure 1
What percentage of the atoms in the metal mixture are atoms of X?
Give your answer to 2 significant figures.
[2 marks]
Percentage of X atoms in mixture = ____________________ %
1.6
What are mixtures of metals called?
Tick one box.
[1 mark]
Alloy
Compound
Element
Polymer
2.0
This question is about bonding and atomic structure.
2.1
Draw one line from each type of bonding to the description of bonding.
[2 marks]
Type of bonding
Description of bonding
Covalent bonding
Positive ions surrounded by delocalised
electrons
Metallic bonding
Strong electrostatic forces of attraction
Ionic bonding
Sharing of electrons
Figure 2 shows the structure of two small molecules, oxygen and compound X.
Figure 2
O
F
O
Oxygen
C
F
F
F
2.2
Compound X
Oxygen (O2) is described as a diatomic element.
Suggest what is meant by the term “diatomic element”.
[1 mark]
_____________________________________________________________________
2.3
Give the molecular formula of compound X
[1 mark]
_____________________________________________________________________
2.4
Complete the sentence by putting a ring around the correct word.
[1 mark]
Chemicals with small molecules usually have a low / medium / high melting point.
3.0
A student investigated the conductivity of different concentrations of sodium chloride
solution. The student’s results are shown below.
Number of drops of sodium chloride
solution added
Relative conductivity
of solution
0
0
1
100
2
120
3
310
4
400
5
510
6
590
7
710
8
800
The student plotted some of the results on the graph shown in Figure 3.
Figure 3
Number of drops of sodium chloride added
3.1
On the graph:
•
Plot the remaining results
•
Draw a line of best fit.
[2 marks]
3.2
Draw a ring around the anomalous point.
[1 mark]
3.3
The student compared the conductivity of sodium chloride solution with the conductivity
of potassium chloride solution.
State one variable the student should keep constant when measuring the conductivity
of the two solutions.
[1 mark]
_____________________________________________________________________
3.4
Explain why sodium chloride solution conducts electricity.
[3 marks]
_____________________________________________________________________
_____________________________________________________________________
_____________________________________________________________________
4.0
Some students were discussing whether to make wires for a phone charger from
copper metal or graphite.
4.1
Compare the properties of copper and graphite to decide which material would be
better for making the wire.
[6 marks]
_____________________________________________________________________
_____________________________________________________________________
_____________________________________________________________________
_____________________________________________________________________
_____________________________________________________________________
_____________________________________________________________________
4.2
The surface of some metals, such as iron, corrode when exposed to the air.
Explain how this affects the electrical conductivity of the metal.
[3 marks]
_____________________________________________________________________
_____________________________________________________________________
_____________________________________________________________________
5.0
Sodium Chloride is an ionic compound.
5.1
Explain why ionic compounds are usually solid at room temperature.
[2 marks]
_____________________________________________________________________
_____________________________________________________________________
5.2
Recent research has developed a new type of substance, ionic liquids.
Ionic liquids have melting points at close to or below room temperature.
Ionic liquids are used in batteries as they conduct electricity.
Explain why ionic liquids are used in batteries but solid ionic compounds are not.
[3 marks]
_____________________________________________________________________
_____________________________________________________________________
_____________________________________________________________________
6.0
Iodine is in Group 7.
6.1
Complete the diagram below to show the bonding in iodine, I2.
Show the outer electrons only.
[2 marks]
6.2
Explain, in terms of particles, why liquid iodine does not conduct electricity.
[3 marks]
_____________________________________________________________________
_____________________________________________________________________
_____________________________________________________________________
6.3
Many people do not have enough iodine in their diet.
Some scientists recommend that salt should have a compound of iodine added.
Give one ethical reason why a compound of iodine should not be added to food.
[1 mark]
_____________________________________________________________________
7.0
A student was investigating a compound, X.
The student decided that compound X was an ionic compound.
Give three properties of ionic compounds that the student may have found.
[3 marks]
_____________________________________________________________________
_____________________________________________________________________
_____________________________________________________________________
4-1 / 6-1 Energy – Physics
1.0
A weightlifter picks up a barbell.
1.1
Which type of energy is stored in the barbell when it is held above the weightlifter’s
head?
[1 mark]
Chemical potential
Elastic potential
Gravitational potential
Kinetic
1.2
The weightlifter drops the barbell.
The barbell’s store of which type of energy increases as the barbell falls.
[1 mark]
Chemical potential
Elastic potential
Gravitational potential
Kinetic
1.3
Use the data in table 1 to draw a line between each calculation and the energy change
it is calculating.
Draw two lines only.
Table 1
mass of barbell
50 kg
gravitational field strength
9.8 m/s2
height the barbell drops
2m
maximum speed the barbell drops
6.2 m/s
[1 mark]
Calculation
Increase / decrease in
Chemical potential energy
50 × 9.8 × 2
Elastic potential energy
Gravitational potential energy
½ × 50 × 6.2 × 6.2
Kinetic energy
1.4
Explain why the weightlifter’s internal store of energy decreased more when he lifted
the bar than the bar’s internal store of energy gained.
[2 marks]
_____________________________________________________________________
_____________________________________________________________________
2.0
Electricity in the UK is produced from a number of energy resources.
Figure 1 below shows the proportion of each energy resource used.
The labels have been removed from the pie chart.
Figure 1
A
B
E
C
D
2.1
Complete the table.
[2 marks]
Energy resource
Percentage of UK
electricity production
Coal
23
Natural gas
30
Nuclear power
21
Oil
1
Renewable fuels
25
Segment label
2.2
Over the next 10 years, many of the UK’s nuclear power stations are expected to
close.
Suggest how this may affect the future balance of sources of energy used for electricity
production in the UK.
[6 marks]
_____________________________________________________________________
_____________________________________________________________________
_____________________________________________________________________
_____________________________________________________________________
_____________________________________________________________________
_____________________________________________________________________
3.0
A student investigated how the extension of a spring depends on the force applied to
the spring.
Figure 2 shows the spring before and after a force has been applied.
Figure 2
3.1
The distance between each large mark on the rule is 10cm.
Point A is on a large mark.
State the length of the spring and the extension after the force is applied.
[1 mark]
Length of spring = ______________ cm
Extension = ______________ cm
3.2
The stretched spring stores elastic potential energy.
The elastic potential energy stored in a spring can be found by using the equation:
Elastic potential energy = 0.5 × spring constant × (extension)2
A particular spring has a spring constant of 25 N/m.
Calculate the energy stored when the spring is extended by 15 mm.
Give your answer in standard form, to 3 significant figures.
[3 marks]
Energy stored = ____________ J
3.3
Another student calculated that the energy stored in her spring was twice the amount
of energy for half the extension.
Calculate the spring constant of this spring.
[3 marks]
Spring constant = ____________ N/m
4.0
Figure 3 shows the amount of energy lost at various stages in production of electricity
to light a light bulb.
Figure 3
1J of energy
output as light
100 J of
internal
energy in
coal
Power
station
Power line
65J of energy
wasted
heating air in
power station
Light bulb
5 J of energy
wasted
heating air
around power
lines
Not to scale
4.1
A label is missing from the diagram.
What should it say?
[1 mark]
_____________________________________________________________________
4.2
The electricity company wants to reduce wasted energy.
For the same amount of money, they can either:
•
Use 20% of the wasted energy from the power station to heat their offices
•
Install new power lines which only waste half the energy as the old ones
•
Replace all the bulbs in the town with LED bulbs, which are 99% efficient.
Explain which of these things they should do.
[2 marks]
_____________________________________________________________________
_____________________________________________________________________
4.3
The lightbulb’s manufacturer says that the lightbulb is 5% efficient.
Is this correct?
Use a calculation to justify your answer.
[2 marks]
_____________________________________________________________________
_____________________________________________________________________
4.4
Another lightbulb has a power of 12 W.
It has an efficiency of 80%.
Calculate the amount of time taken in seconds for the bulb to transfer 300 J of energy
into light energy.
[3 marks]
Time taken = _______________ s
5.1
You have been asked to find out the best material for insulating a hot water tank.
You have three materials: aluminium foil, cotton wool and expanded polystyrene.
Describe an experiment to compare the effectiveness these materials.
Include in your description how you would use your results to decide the most effective
material.
[6 marks]
_____________________________________________________________________
_____________________________________________________________________
_____________________________________________________________________
_____________________________________________________________________
_____________________________________________________________________
_____________________________________________________________________
6.0
A student carried heated a beaker of water and measured the temperature every
minute. Figure 4 shows the results of their experiment.
Figure 4
100
90
80
70
60
Temperature 50
(°C)
40
30
20
10
0
0
1
2
3
4
5
6
7
8
Time (minutes)
6.1
The mass of water used was 450 g.
The power of the heater is 300 W.
Calculate the specific heat capacity of the water.
[3 marks]
Specific heat capacity = __________ J/kg°C
6.2
The result of this experiment is higher than the accepted value for water.
Suggest two reasons why this might be.
[2 marks]
_____________________________________________________________________
_____________________________________________________________________
6-2 Electricity – Physics
1.0
Most domestic appliances are connected to the mains electricity.
1.1
What is the frequency of mains electricity?
Tick one box
[1 mark]
1.05 A
50 Hz
230 V
1.2
What is the potential difference of mains electricity?
Tick one box
[1 mark]
1.05 A
50 Hz
230 V
1.3
Most domestic appliances are connected to the mains electricity with a plug.
Explain why a plug needs a live and a neutral wire.
[2 marks]
_____________________________________________________________________
_____________________________________________________________________
1.4
The law specifies the colour that mains wires should be for all domestic electrical
circuits.
It is important that the live wire is easy to identify to reduce the risk of an electric shock.
Explain how an electric shock can be caused by a person touching the live wire.
[2 marks]
_____________________________________________________________________
_____________________________________________________________________
1.5
An iron is supplied with a current of 3 A from the mains. The resistance of the iron is
100 Ω.
Calculate the power of the iron.
[2 marks]
Power = ______________ W
2.0
A student wants to investigate how the current through a filament lamp affects its
resistance.
2.1
Use the circuit symbols in Figure 1 to draw a circuit diagram that he could use.
[2 marks]
Figure 1
12 V battery
2.2
variable
resistor
filament
lamp
voltmeter
ammeter
Describe how the student could use her circuit to investigate how the current through a
filament lamp affects its resistance.
[4 marks]
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3.0
A student sets up the electrical circuit shown in Figure 5 below.
Figure 5
6V
75Ω
150Ω
3.1
The ammeter displays a reading of 0.025 A.
Calculate the potential difference across the 75 Ω resistor.
Give your answer to 2 significant figures.
[2 marks]
Potential difference = _______________ V
3.2
Calculate the resistance of the resistor labelled R.
[3 marks]
Resistance = __________________ Ω
3.3
State what happens to the total resistance of the circuit and the current through the
circuit when switch S is closed.
[2 marks]
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4.0
A student investigated how current varies with potential difference for two different
lamps of the same type.
Her results are shown in the Figure 6 below.
Figure 6
4.1
Draw the circuit diagram for the circuit that the student could have used to obtain the
results shown in the figure above.
[3 marks]
4.2
The student make the following conclusion
‘Lamp A is twice a bright as lamp B’
Use data from Figure 2 to explain why the student’s conclusion is correct.
[3 marks]
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4.3
The resistance of each lamp increases as the current increases.
Calculate the difference between the lowest and highest values of resistance for lamp
A from Figure 2.
[4 marks]
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