# data[].attributes.body
Focus on how to calculate the MEAN of numbers.
Mean of some number = (add up all the numbers) and then divide by (how many numbers there are)

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How to find the mean, median, mode and range

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Mode, median and mean are three types of average. Find out how to calculate them and the range of numbers in this KS2 Primary Maths guide.

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Check what you already know - current electricity

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Check what you already know - current electricity

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Electric circuits - AQA test questions - AQA Trilogy - GCSE Combined Science Revision - BBC Bitesize

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Learn about and revise electrical circuits, charge, current, power and resistance with GCSE Bitesize Combined Science.

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Mains electricity and AC - AQA test questions - AQA Trilogy - GCSE Combined Science Revision - BBC Bitesize

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Learn about and revise mains electricity, current and the role of the National Grid with this GCSE Bitesize Combined Science.

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Density of materials test questions - GCSE Combined Science - AQA Trilogy - BBC Bitesize

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Learn about and revise density of materials and how to measure the density of various materials with GCSE Bitesize Combined Science.

# data[].attributes.headline
Check what you already know - energy stores

# data[].attributes.subject
Check what you already know - energy stores

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Changes in energy stores - AQA test questions - AQA Trilogy - GCSE Combined Science Revision - BBC Bitesize

# data[].attributes.attachment_link.description
Learn about and revise energy stores, transfers, conservation, dissipation and how to calculate energy changes with GCSE Bitesize Combined Science.

# data[].attributes.headline
Check what you already know - atoms and isotopes

# data[].attributes.subject
Check what you already know - atoms and isotopes

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Atoms, isotopes and ions - AQA test questions - AQA Trilogy - GCSE Combined Science Revision - BBC Bitesize

# data[].attributes.attachment_link.description
Learn about and revise the structure of atoms, atoms and isotopes and ions with GCSE Bitesize Combined Science.

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Energy demands - AQA test questions - AQA Trilogy - GCSE Combined Science Revision - BBC Bitesize

# data[].attributes.attachment_link.description
Learn about and revise the different needs for energy and where it comes from with GCSE Bitesize Combined Science.

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Energy and heating - AQA test questions - AQA Trilogy - GCSE Combined Science Revision - BBC Bitesize

# data[].attributes.attachment_link.description
Learn about and revise energy and how it is transferred from place to place with GCSE Bitesize Combined Science.

# data[].attributes.headline
Check what you already know - static electricity

# data[].attributes.subject
Check what you already know - static electricity

# data[].attributes.attachment_link.title
Static electricity - AQA test questions - AQA - GCSE Physics (Single Science) Revision - BBC Bitesize

# data[].attributes.attachment_link.description
Learn about and revise static electricity, electrical charges and electric fields with GCSE Bitesize Physics.

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Independent variable - the thing we change during an experiment to see its effect.
Dependent variable - the things we measure during an experiment to see how they have been affected
Control/controlled variables - the things we keep the same so that they do not affect the experiment.

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What Are Independent, Dependent And Controlled Variables?

# data[].attributes.headline
Check what you already know - states of matter

# data[].attributes.subject
Check what you already know - states of matter

# data[].attributes.attachment_link.title
States of matter - AQA Synergy test questions - AQA Synergy - GCSE Combined Science Revision - BBC Bitesize

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Revise and learn about states of matter with this BBC Bitesize Combined Science AQA Synergy study guide.

# data[].attributes.headline
Check what you already know - work, power, efficiency

# data[].attributes.subject
Check what you already know - work, power, efficiency

# data[].attributes.attachment_link.title
Work, power and efficiency - AQA test questions - AQA Trilogy - GCSE Combined Science Revision - BBC Bitesize

# data[].attributes.attachment_link.description
Learn about and revise energy and how it's related to work, power and efficiency with GCSE Bitesize Combined Science.

# data[].attributes.headline
Check what you already know - radioactive decay

# data[].attributes.subject
Check what you already know - radioactive decay

# data[].attributes.attachment_link.title
Radioactive decay - AQA test questions - AQA Trilogy - GCSE Combined Science Revision - BBC Bitesize

# data[].attributes.attachment_link.description
Learn about and revise nuclear radiation, radioactive decay and half-life with GCSE Bitesize Combined Science.

# data[].attributes.headline
Check what you already know - fission and fusion

# data[].attributes.subject
Check what you already know - fission and fusion

# data[].attributes.attachment_link.title
Nuclear fission and fusion - AQA test questions - AQA - GCSE Physics (Single Science) Revision - BBC Bitesize

# data[].attributes.attachment_link.description
Learn about and revise nuclear fission, nuclear fusion and how energy is released from these processes with GCSE Bitesize Physics.

# data[].attributes.headline
Check what you already know - Gas pressure

# data[].attributes.subject
Check what you already know - Gas pressure

# data[].attributes.attachment_link.title
Particles in gases - AQA test questions - AQA - GCSE Physics (Single Science) Revision - BBC Bitesize

# data[].attributes.attachment_link.description
Learn about and revise particle motion, gas pressure and the relationship between pressure and volume with GCSE Bitesize Physics.

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What you need to know: Peer review is when scientists read and check each other's work to see if it is of a good quality.
The video contains some more details if you are interested.

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P4 explained by Miss Dlima with some Q&A

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P4 explained by Miss Dlima with some Q&A

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GCSE Science Revision Physics "Mains Electricity"

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Where does energy come from? - Energy demands - AQA - GCSE Combined Science Revision - AQA Trilogy - BBC Bitesize

# data[].attributes.attachment_link.description
Learn about and revise the different needs for energy and where it comes from with GCSE Bitesize Combined Science.

# data[].attributes.attachment_link.title
Energy and heating - Energy and heating - AQA - GCSE Combined Science Revision - AQA Trilogy - BBC Bitesize

# data[].attributes.attachment_link.description
Learn about and revise energy and how it is transferred from place to place with GCSE Bitesize Combined Science.

# data[].attributes.headline
FreeScienceLessons - Current in series circuits

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FreeScienceLessons - Current in series circuits

# data[].attributes.attachment_link.title
GCSE Physics Revision "Current in Series Circuits"

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This is common content with Chemistry

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GCSE Science Revision Chemistry "The Three States of Matter"

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Types of energy store - Changes in energy stores - AQA - GCSE Combined Science Revision - AQA Trilogy - BBC Bitesize

# data[].attributes.attachment_link.description
Learn about and revise energy stores, transfers, conservation, dissipation and how to calculate energy changes with GCSE Bitesize Combined Science.

# data[].attributes.attachment_link.title
GCSE Science Revision Physics "Properties of Alpha, Beta and Gamma Radiation"

# data[].attributes.attachment_link.title
Specific heat capacity - Energy and heating - AQA - GCSE Combined Science Revision - AQA Trilogy - BBC Bitesize

# data[].attributes.attachment_link.description
Learn about and revise energy and how it is transferred from place to place with GCSE Bitesize Combined Science.

# data[].attributes.headline
FreeScienceLessons - Current in parallel circuits

# data[].attributes.subject
FreeScienceLessons - Current in parallel circuits

# data[].attributes.attachment_link.title
GCSE Science Revision Physics "Current in Parallel Circuits"

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Work, power and efficiency - Work, power and efficiency - AQA - GCSE Combined Science Revision - AQA Trilogy - BBC Bitesize

# data[].attributes.attachment_link.description
Learn about and revise energy and how it's related to work, power and efficiency with GCSE Bitesize Combined Science.

# data[].attributes.attachment_link.title
GCSE Science Revision Physics "Nuclear Equations"

# data[].attributes.attachment_link.title
GCSE Science Revision Physics "Renewable Sources of Energy"

# data[].attributes.headline
FreeScienceLessons - Calculating energy transfer in circuits

# data[].attributes.subject
FreeScienceLessons - Calculating energy transfer in circuits

# data[].attributes.attachment_link.title
GCSE Science Revision Physics "Calculating Energy Transfer by Components"

# data[].attributes.attachment_link.title
GCSE Physics Revision "Specific Latent Heat"

# data[].attributes.attachment_link.title
Energy and power - Work, power and efficiency - AQA - GCSE Combined Science Revision - AQA Trilogy - BBC Bitesize

# data[].attributes.attachment_link.description
Learn about and revise energy and how it's related to work, power and efficiency with GCSE Bitesize Combined Science.

# data[].attributes.body
I've made this video start from 2:09 to go straight to the method of calculating half-life from a graph.

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GCSE Science Revision Physics "Half Life"

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GCSE Science Revision Physics "Required Practical 3: Resistance"

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A transformer usefully transfers 190,000 W of the 200,000 W of energy supplied to it. How efficient is the transformer?

\[efficiency = \frac{useful~power~transferred}{total~power~supplied}\]

\[efficiency = \frac{190,000}{200,000}\]

\[efficiency = 0.95\]

\[percentage~efficiency = efficiency \times 100\]

\[percentage~efficiency = 0.95 \times 100\]

\[percentage~efficiency = 95\%\]

The transformer is very efficient, since 95% of the energy supplied to it is usefully transferred. This means that the transformer only wastes 5% of the energy supplied to it.

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Efficiency - Work, power and efficiency - AQA - GCSE Combined Science Revision - AQA Trilogy - BBC Bitesize

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A transformer usefully transfers 190,000 W of the 200,000 W of energy supplied to it. How efficient is the transformer? \[efficiency = \frac{useful~power~transferred}{total~power~supplied}\] \[efficiency = \frac{190,000}{200,000}\] \[efficiency = 0.95\] \[percentage~efficiency = efficiency \times 100\] \[percentage~efficiency = 0.95 \times 100\] \[percentage~efficiency = 95\%\] The transformer is very efficient, since 95% of the energy supplied to it is usefully transferred.

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GCSE Science Revision Physics "Gravitational Potential Energy"

# data[].attributes.attachment_link.title
GCSE Science Revision Physics "Efficiency"

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The Irish scientist, Robert Boyle, originally investigated this relationship in the 17th century. Boyle carried out an experiment that gave one of the first pieces of experimental evidence for the .

By pouring mercury into a J-shaped tube that was sealed at one end, Boyle was able to trap a bubble of air. He then poured more mercury in slowly and watched what happened to the volume of the air bubble.

The higher the column of mercury in the left hand side of the tube, the greater the pressure the trapped air was experiencing and the smaller the bubble became.

For a fixed mass of gas at a constant temperature:

pressure × volume = constant

\[p~V = constant\]

This is when:

If the of a gas stays the same, the pressure of the gas increases as the volume of its container decreases. This is because the same number of particles collides with the walls of the container more frequently as there is less space. However, the particles still collide with the same amount of force.

The change in volume or pressure for gas at a constant temperature can be calculated using the equation:

A gas occupies a volume of 0.50 m³ at a pressure of 100 Pa. Calculate the pressure exerted by the gas if it is compressed to a volume of 0.25 m³. Assume that the temperature and mass of the gas stay the same.

\[p_2 = \frac{p_1 \times v_1}{V_2}\]

\[p_2 = \frac{100 \times 0.50}{0.25}\]

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Pressure and volume - Particles in gases - AQA - GCSE Physics (Single Science) Revision - AQA - BBC Bitesize

# data[].attributes.attachment_link.description
The Irish scientist, Robert Boyle, originally investigated this relationship in the 17th century. Boyle carried out an experiment that gave one of the first pieces of experimental evidence for the . By pouring mercury into a J-shaped tube that was sealed at one end, Boyle was able to trap a bubble of air.

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GCSE Science Revision Physics "Required Practical 4: Current / PD Characteristics"

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Multiple choice questions are perhaps the easiest to complete - you simply put a cross in a box - however, the questions often have two answers that could, at first glance, be correct. Don't make the mistake of reading the first answer and thinking this is correct without checking all the others.

If it says 'Tick box', you must tick one box. If you leave it blank or tick two or more boxes you will get zero marks. These multiple choice questions will not start with command words like 'describe' or 'explain'. They will be written in the form of a question like 'What...?' or 'Why...?'.

There will be more multiple choice questions on the Foundation paper.
This page contains AQA material which is reproduced by permission of AQA.

Sample question 1 - Foundation

Energy resources that involve burning fuels such as coal, oil, natural gas or biomass release pollutants into the atmosphere. This includes large amounts of carbon dioxide. Carbon dioxide contributes to the greenhouse effect and global warming.

Sample question 2 - Foundation

An island has a large number of wind turbines and a coal-fired power station.

The island needs to use the electricity generated by the coal-fired power station at certain times.

Wind turbines only generate electricity when it's sufficiently windy. Reliable energy resources such as coal-fired power stations are required to generate electricity when the output from wind turbines is low.

Sample question 3 - Foundation

What name is given to the total kinetic energy and potential energy of all the particles of helium gas in a helium balloon?

Particles vibrate, and have kinetic energy. There is also potential energy stored in the bonds between them. These two energy stores combined are known as internal energy.

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Sample exam questions - Energy - AQA - Revision 1 - GCSE Physics (Single Science) - BBC Bitesize

# data[].attributes.attachment_link.description
Multiple choice questions are perhaps the easiest to complete - you simply put a cross in a box - however, the questions often have two answers that could, at first glance, be correct. Don't make the mistake of reading the first answer and thinking this is correct without checking all the others.

# data[].attributes.attachment_link.readable_text
Multiple choice questions are perhaps the easiest to complete - you simply put a cross in a box - however, the questions often have two answers that could, at first glance, be correct. Don't make the mistake of reading the first answer and thinking this is correct without checking all the others.

If it says 'Tick box', you must tick one box. If you leave it blank or tick two or more boxes, you will get zero marks. These multiple choice questions will not start with command words like 'describe' or 'explain'. They will be written in the form of a question like 'What...?' or 'Why...?'.

There will be more multiple choice questions on the Foundation paper.
This page contains AQA material which is reproduced by permission of AQA.

Sample question 1 - Foundation

Direct current flows around a complete circuit in one direction only. Current that changes direction is described as alternating current.

Sample question 2 - Foundation

The National Grid is the network of power stations, cables and transformers that allows electrical energy to be transferred to different areas.

Sample question 3 - Higher

A positively charged object is placed in an electric field around a positively charged metal dome.

In which position would the object experience the greatest force?

Force will be strongest when charged objects are close together.

Sample question 4 - Higher

Use the correct answer from the box to complete the sentence.

A fuse is connected in the ____________ wire.

live
The fuse is connected in the live wire. If a high current flows and melts the fuse, the device is no longer connected to the live mains supply.

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Sample exam questions - Electricity - AQA - Revision 1 - GCSE Physics (Single Science) - BBC Bitesize

# data[].attributes.attachment_link.description
Multiple choice questions are perhaps the easiest to complete - you simply put a cross in a box - however, the questions often have two answers that could, at first glance, be correct. Don't make the mistake of reading the first answer and thinking this is correct without checking all the others.

# data[].attributes.attachment_link.readable_text
Multiple choice questions are perhaps the easiest to complete - you simply put a cross in a box - however, the questions often have two answers that could, at first glance, be correct. Don't make the mistake of reading the first answer and thinking this is correct without checking all the others.

If it says 'Tick box', you must tick one box. If you leave it blank or tick two or more boxes, you will get zero marks. These multiple choice questions will not start with command words like 'describe' or 'explain'. They will be written in the form of a question like 'What...?' or 'Why...?'.

There will be more multiple choice questions on the Foundation paper.

Sample question 2 - Foundation and Higher

What name is given to the total kinetic energy and potential energy of all the particles of helium gas in the balloon?
This question is AQA material which is reproduced by permission of AQA.

Internal energy is the name given to the total kinetic and potential energy of all particles in a substance. Internal energy is changed by heating or cooling the substance. Changing the internal energy of a substance will cause a change in temperature or state.

Sample question 3 - Higher

This question has been written by a Bitesize consultant as a suggestion to the type of question that may appear in an exam paper.

Density is calculated by dividing a mass, measured in kilograms, by a volume, measured in metres cubed.

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Particle model of matter - Multiple choice questions - Sample exam questions - AQA - GCSE Physics (Single Science) Revision - AQA - BBC Bitesize

# data[].attributes.attachment_link.description
Multiple choice questions are perhaps the easiest to complete - you simply put a cross in a box - however, the questions often have two answers that could, at first glance, be correct. Don't make the mistake of reading the first answer and thinking this is correct without checking all the others.

# data[].attributes.attachment_link.readable_text
Multiple choice questions are perhaps the easiest to complete - you simply put a cross in a box - however, the questions often have two answers that could, at first glance, be correct. Don't make the mistake of reading the first answer and thinking this is correct without checking all the others.

If it says 'Tick one box', you must tick box. If you leave it blank or tick two or more boxes you will get zero marks. These multiple-choice questions will not start with command words like 'Describe...' or 'Explain...'. They will be written in the form of a question like or

There will be more multiple choice questions on the Foundation paper.

Sample Question 1 - Foundation

When food is eaten, some of the radiation the food emits is detectable outside the body.

Which type of radiation would not be detectable outside the body?
This question is AQA material which is reproduced by permission of AQA.

Alpha particles are stopped by skin alone so would not be able to penetrate the many layers of tissue in the body.

Sample Question 2 - Foundation

The activity of a sample of potassium-40 is measured 3 times.

The measurements are given below.

Which of the following statements explains why the readings are different?
This question is AQA material which is reproduced by permission of AQA.

As radioactive decay is random, repeated measurements are unlikely to be identical.

Sample Question 3 - Higher

A nucleus is much smaller than an atom.

Approximately how many times smaller is a nucleus than an atom?
This question has been written by a Bitesize consultant as a suggestion to the type of question that may appear in an exam paper.

A nucleus is 10,000 times smaller than an atom.

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Atomic structure - Multiple choice questions - Sample exam questions - AQA - GCSE Physics (Single Science) Revision - AQA - BBC Bitesize

# data[].attributes.attachment_link.description
Multiple choice questions are perhaps the easiest to complete - you simply put a cross in a box - however, the questions often have two answers that could, at first glance, be correct. Don't make the mistake of reading the first answer and thinking this is correct without checking all the others.

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make and record measurements of temperature and time accurately

measure and observe the effect of different materials as thermal insulators

use appropriate apparatus and methods to measure the effectiveness of different materials as thermal insulators

Aim of the experiment

To compare the effectiveness of different materials as thermal insulators.

1. Place a small beaker into a larger beaker.

2. Fill the small beaker with hot water from a kettle.

3. Put a piece of cardboard over the beakers as a lid. The lid should have a hole suitable for a thermometer.

4. Place a thermometer into the smaller beaker through the hole.

5. Record the temperature of the water in the small beaker and start the stopwatch.

6. Record the temperature of the water every 2 minutes for 20 minutes.

7. Repeat steps 1-6, each time packing the space between the large beaker and small beaker with the chosen insulating material.

8. Plot a graph of temperature (y-axis) against time (x-axis).

Plot all of the curves on the same axes. This will make the materials easier to compare.

This graph shows:

The curve which takes the longest time for the water temperature to drop (the shallowest) should be the material which is the best insulator.

The temperature falls quickly at high temperatures and slowly at low temperatures.

When the beaker is at a high temperature, there is a big difference between the temperature of the beaker and the temperature of the surrounding air. This means there is a high of transfer.

When the beaker is at a lower temperature, there is less difference between the temperature of the beaker and the temperature of the surrounding air. This means there is a lower rate of transfer.

Hazards and control measures

Boiling water

Do not overfill the kettle. Place the small beaker inside the large beaker before gently pouring the water. Remember to place any scald under cold running water for at least 10 minutes.

Knocking beaker off the desk

Place the beaker away from the edge of desk. Carry out the experiment whilst standing.

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Required practical - investigating methods of insulation part 1 - Energy and heating - AQA - GCSE Physics (Single Science) Revision - AQA - BBC Bitesize

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make and record measurements of temperature and time accurately measure and observe the effect of different materials as thermal insulators use appropriate apparatus and methods to measure the effectiveness of different materials as thermal insulators To compare the effectiveness of different materials as thermal insulators. Place a small beaker into a larger beaker.

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There are different ways to investigate methods of insulation. In this practical activity, it is important to:

make and record measurments of temperature and time accurately

measure and observe the effect of the different thicknesses of the insulator

use appropriate apparatus and methods to measure the effectiveness of different thicknesses of thermal insulators

Aim of the experiment

To compare the effectiveness of different thicknesses of thermal insulators.

1. Wrap a sheet of newspaper around a 100 ml beaker.

2. Fill the beaker with hot water from a kettle.

3. Put a piece of cardboard over the beaker as a lid. The lid should have a hole suitable for a thermometer.

4. Place a thermometer into the beaker through the hole.

5. Record the temperature of the water in the beaker and start the stopwatch.

6. Record the temperature of the water every 2 minutes for 20 minutes.

7. Repeat steps 1-6, each time adding another layer of newspaper around the beaker until there are 10 layers of newspaper wrapped around the beaker.

8. Plot graphs of temperature against time.

For each layer, plot a line graph of temperature on the y-axis and time on the x-axis. Plot all of the curves on the same axes. This will make the different thicknesses easier to compare.

Evaluation

This graph shows:

The curve which takes the longest time for the water temperature to drop (the shallowest gradient) shows the amount of layers that provide the best insulation.

The curve for no insulation has the steepest gradient at any given time interval when compared to any other curve. As the number of layers increases, the gradient of each curve decreases at any given time interval.

Having more layers of paper increases the insulation which means the temperature drops more slowly. The thickest insulation has the lowest rate of cooling.

The temperature falls quickly at high temperatures and slowly at low temperatures.

Hazards and control measures

Boiling water

Do not overfill the kettle. Place the small beaker inside the large beaker before gently pouring the water. Remember to place any scald under cold running water for at least 10 minutes.

Knocking beaker off the desk

Place the beaker away from the edge of desk. Carry out the experiment whilst standing.

# data[].attributes.attachment_link.title
Required practical - investigating methods of insulation part 2 - Energy and heating - AQA - GCSE Physics (Single Science) Revision - AQA - BBC Bitesize

# data[].attributes.attachment_link.description
There are different ways to investigate methods of insulation. In this practical activity, it is important to: make and record measurments of temperature and time accurately measure and observe the effect of the different thicknesses of the insulator use appropriate apparatus and methods to measure the effectiveness of different thicknesses of thermal insulators To compare the effectiveness of different thicknesses of thermal insulators.

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Charging by friction - Static electricity - AQA - GCSE Physics (Single Science) Revision - AQA - BBC Bitesize

# data[].attributes.attachment_link.description
Learn about and revise static electricity, electrical charges and electric fields with GCSE Bitesize Physics.

# data[].attributes.attachment_link.title
AQA GCSE Physics Topic 1: Energy Revision - PMT

# data[].attributes.attachment_link.description
Summary notes, revision videos and past exam questions by topic for AQA Physics GCSE Topic 1 - Energy

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AQA GCSE Physics Topic 2: Electricity Revision - PMT

# data[].attributes.attachment_link.description
Summary notes, revision videos and past exam questions by topic for AQA Physics GCSE Topic 2 - Electricity

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AQA GCSE Physics Topic 3: Particle Model Revision - PMT

# data[].attributes.attachment_link.description
Summary notes, revision videos and past exam questions by topic for AQA Physics GCSE Topic 3 - Particle Model

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John T.

Open University - BSc Physical Sciences

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January mocks on the horizon? Kick-start your revision with our 2-day online Mock Preparation courses. Suitable for separate and combined science higher level students. Science AQA GCSE and Edexcel IGCSE - 2-3rd and 5-6th January. Book your place now!

Questions by Topic

2018-2021 papers

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Questions selected for the current specification

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AQA GCSE Physics Topic 4: Atomic Structure Revision - PMT

# data[].attributes.attachment_link.description
Summary notes, revision videos and past exam questions by topic for AQA Physics GCSE Topic 4 - Atomic Structure