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 Target number of marks to achieve

1 60 2 70 3 80 4 90 5 100 6 120 7 140 8 160

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

1.1 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 ____________________ .

Cell A Cell B

Cell C Cell D

Oxygen molecules

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.

Beaker 1 Beaker 2 Beaker 3 Beaker 4 Beaker 5 Distilled

water 10%

sucrose solution

20% sucrose solution

30% sucrose solution

40% sucrose solution

4.1 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

Percentage gain or loss in mass

Gain 30% Gain 15.1%

Loss 10% Loss 21.8%

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

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

5.1 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

1 2 3 4 5 6 7 8 9

Time taken to remove stain in minutes 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

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]

_____________________________________________________________________

A

B

C

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 Au19779 .

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 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

5.1 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 Chlorine has two isotopes Cland Cl 3717

3517

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 2 3 4 5 6 7 8

Period 1 H

Period 2 Li Be B C N O F

Period 3 Na Mg Al Si P S Cl

Period 4 K

Cu Ca

Zn –

– Ti

– V

As Cr

Se Mn

Br Fe Co Ni

6.1 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

20

22

24

1.2 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

2.2 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.

O O O F

F

F

F

C

Oxygen

Compound X

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 2 m

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

2.1 Complete the table. [2 marks]

Energy resource Percentage of UK electricity production Segment label

Coal 23

Natural gas 30

Nuclear power 21

Oil 1

Renewable fuels 25

A B

E

C D

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 Light bulb

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]

_____________________________________________________________________

_____________________________________________________________________

100 J of internal

energy in coal

Power station

Power line

65J of energy wasted heating air in power station

5 J of energy wasted heating air around power lines

1J of energy output as light

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

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]

_____________________________________________________________________

_____________________________________________________________________

0

10

20

30

40

50

60

70

80

90

100

0 1 2 3 4 5 6 7 8

Temperature (°C)

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 variable resistor

filament lamp

voltmeter ammeter

2.2 Describe how the student could use her circuit to investigate how the current through a filament lamp affects its resistance.

[4 marks]

_____________________________________________________________________

_____________________________________________________________________

_____________________________________________________________________

_____________________________________________________________________

3.0 A student sets up the electrical circuit shown in Figure 5 below.

Figure 5

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]

_____________________________________________________________________

_____________________________________________________________________

6V

75Ω

150Ω

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]

_____________________________________________________________________

_____________________________________________________________________

_____________________________________________________________________

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]

_____________________________________________________________________

_____________________________________________________________________

_____________________________________________________________________

_____________________________________________________________________