Revision Library

revisionlibrary.co.uk

13+ · Science

CE.S-T8 Science: Full Practice Paper 8

ISEB COMMON ENTRANCE CE.S-T8 · Calculator allowed · about 60 minutes

Total Marks

Name: _______________________________ Date: ____ / ____ / ______

Answer ALL questions. Show all your working.

Which organ produces bile, a substance that helps to digest fats in the small intestine?

A) Stomach
B) Liver
C) Pancreas
D) Gall bladder

(Total for Question 1 is 1 mark)

Which gas is released by all living cells, including plant cells, as a waste product of respiration?

A) Oxygen
B) Carbon dioxide
C) Nitrogen
D) Hydrogen

(Total for Question 2 is 1 mark)

A pupil investigates how pH affects the activity of the digestive enzyme pepsin, which breaks down egg-white protein. He mixes the same volume of pepsin solution with the same volume of a cloudy egg-white suspension, buffered to a different pH each time, and measures how long it takes for the cloudy suspension to turn clear.

pH of solution: 1	2	4	7
Time for suspension to clear (s): 45	20	95	260

(a)Identify the independent variable in this investigation.(1)

(b)State one variable that should be kept the same to make this a fair test.(1)

(c)Describe the pattern shown by the results between pH 2 and pH 7.(1)

(d)Suggest why the reaction was fastest at pH 2.(1)

(Total for Question 3 is 4 marks)

Complete the two missing words in these sentences about variation.

(a)Human height, which can take any value within a range and is affected by both genes and environment (such as diet), is an example of ______ variation.(1)

(b)Human blood group, which falls into a small number of distinct categories (such as A, B, AB or O) and is controlled by genes alone, is an example of ______ variation.(1)

(Total for Question 4 is 2 marks)

Describe the role of each of these three structures involved in movement at the elbow joint: the biceps muscle, the triceps muscle, and a tendon.

(a)The biceps muscle.(1)

(b)The triceps muscle.(1)

(c)A tendon.(1)

(Total for Question 5 is 3 marks)

Explain how the structure of the small intestine, with its lining folded into finger-like projections called villi, is adapted to its function of absorbing digested food efficiently.

(Total for Question 6 is 3 marks)

A food chain from a UK hedgerow habitat is:

hawthorn berries -> field vole -> barn owl

(a)Identify the producer in this food chain.(1)

(b)Name the trophic level of the field vole in this food chain.(1)

(c)A store of hawthorn berries contains 6000 kJ of energy. Only 10% of this energy is transferred to the field voles that eat them. Calculate the energy transferred to the field voles.(1)

(d)Give one reason why not all the energy in the field voles' bodies is transferred to the barn owls that eat them.(1)

(Total for Question 7 is 4 marks)

Explain three ways in which the body of a typical river fish, such as a trout, is adapted to help it survive and swim well in fast-flowing water.

(Total for Question 8 is 3 marks)

A group of pupils investigates whether the percentage cover of daisy plants on the school field changes with distance from a large oak tree, which casts shade. They place a 1 m x 1 m quadrat at set points along a tape measure (a transect) running away from the tree, and estimate the percentage cover of daisies inside the quadrat at each point.

Distance from the tree (m): 1	3	5	7
Percentage cover of daisies (%): 4	18	40	65

(a)Identify the independent variable in this investigation.(1)

(b)State one variable that should be kept the same for this to be a fair test.(1)

(c)Describe the pattern shown by the results.(1)

(d)Suggest an explanation for this pattern.(1)

(Total for Question 9 is 4 marks)

Vaccination programmes are used to protect people against diseases caused by pathogens such as viruses and bacteria. Explain how vaccination can protect both an individual and a whole population against a disease caused by a pathogen.

(Total for Question 10 is 6 marks)

Which piece of apparatus is used to measure and deliver one precise, fixed volume of liquid very accurately, such as exactly 25.0 cm³?

A) Measuring cylinder
B) Pipette
C) Beaker
D) Test tube

(Total for Question 11 is 1 mark)

Which separation technique is used to separate the different coloured dyes in a mixture, such as ink, based on how far each dye travels up a piece of absorbent paper?

A) Chromatography
B) Filtration
C) Evaporation
D) Distillation

(Total for Question 12 is 1 mark)

Complete the two missing words in these sentences about diffusion.

(a)The gradual, random movement of particles from a region of higher concentration to a region of lower concentration, until they are evenly spread out, is called ______.(1)

(b)Diffusion happens fastest in a ______, because its particles are far apart, move quickly, and can spread throughout their container easily.(1)

(Total for Question 13 is 2 marks)

Describe the purpose of each of these three pieces of apparatus, used when investigating a chemical reaction that produces a gas: the conical flask, the delivery tube, and an inverted measuring cylinder standing in a trough of water.

(a)The conical flask.(1)

(b)The delivery tube.(1)

(c)The inverted measuring cylinder, standing in a trough of water.(1)

(Total for Question 14 is 3 marks)

A pupil investigates how the mass of manganese oxide (a catalyst) affects the rate at which hydrogen peroxide solution decomposes to form water and oxygen gas. She adds a different mass of manganese oxide powder to the same volume and concentration of hydrogen peroxide solution each time, and measures the volume of oxygen gas collected in the first 30 seconds.

Mass of manganese oxide (g): 0.5	1.0	1.5	2.0
Volume of oxygen collected in 30 s (cm³): 12	22	30	31

(a)Identify the independent variable in this investigation.(1)

(b)State one variable that should be kept the same for this to be a fair test.(1)

(c)Describe the pattern shown by the results.(1)

(d)Suggest why increasing the mass of catalyst from 1.5 g to 2.0 g made very little difference to the volume of oxygen collected.(1)

(Total for Question 15 is 4 marks)

Calcium carbonate decomposes when heated strongly, forming calcium oxide and carbon dioxide gas:

CaCO3 -> CaO + CO2

In an experiment, 25.0 g of calcium carbonate is heated completely, forming 14.0 g of calcium oxide. Calculate the mass of carbon dioxide gas released.

(Total for Question 16 is 2 marks)

Explain three different ways of preventing iron and steel objects from rusting, referring to how each method works.

(Total for Question 17 is 3 marks)

A strip of copper metal is placed into a solution of silver nitrate.

(a)State whether a reaction occurs, and explain why, using ideas about the reactivity series.(1)

(b)Describe one observation that would be made.(1)

(c)Write a word equation for this reaction.(1)

(d)A strip of gold is placed into a solution of copper sulfate instead. State whether a reaction would occur, giving a reason.(1)

(Total for Question 18 is 4 marks)

Describe how each of these three types of rock are formed: igneous rock, sedimentary rock, and metamorphic rock.

(a)Igneous rock.(1)

(b)Sedimentary rock.(1)

(c)Metamorphic rock.(1)

(Total for Question 19 is 3 marks)

A pupil investigates how the volume of dilute hydrochloric acid added affects the volume of carbon dioxide gas produced when it reacts with a fixed mass of sodium hydrogencarbonate (baking soda). She adds different volumes of the same concentration of acid to the same mass of sodium hydrogencarbonate each time, and measures the total volume of gas collected using a gas syringe.

Volume of acid added (cm³): 10	20	30	40
Volume of CO2 gas produced (cm³): 45	90	130	130

(a)Identify the independent variable in this investigation.(1)

(b)State one variable that should be kept the same for this to be a fair test.(1)

(c)Describe the pattern shown by the results.(1)

(d)Explain why adding more acid beyond 30 cm³ produced no extra gas.(1)

(Total for Question 20 is 4 marks)

Which piece of equipment is used to measure the potential difference (voltage) across a component in an electrical circuit?

A) Ammeter
B) Voltmeter
C) Newtonmeter
D) Thermometer

(Total for Question 21 is 1 mark)

Which of these is an example of a renewable energy resource, used to generate electricity in the UK?

A) Coal
B) Natural gas
C) Wind
D) Oil

(Total for Question 22 is 1 mark)

Complete the two missing words in these sentences about the electromagnetic spectrum.

(a)A type of electromagnetic wave with a wavelength longer than red light, used to send signals in TV remote controls and felt as heat from a fire, is called ______ radiation.(1)

(b)A type of electromagnetic wave with a very short wavelength and very high energy, used in hospitals to kill cancer cells and to sterilise medical equipment, is called ______ radiation.(1)

(Total for Question 23 is 2 marks)

Describe the main energy transfer that takes place in each of these four devices: a solar panel, a wind turbine, a microphone, and a loudspeaker.

(a)A solar panel.(1)

(b)A wind turbine.(1)

(c)A microphone.(1)

(d)A loudspeaker.(1)

(Total for Question 24 is 4 marks)

A pupil investigates how the number of turns of insulated wire wrapped around an iron nail affects the strength of the electromagnet formed. She keeps the current in the circuit the same each time, and counts how many paperclips the electromagnet can pick up.

Number of turns of wire: 10	20	30	40
Number of paperclips picked up: 3	6	8	9

(a)Identify the independent variable in this investigation.(1)

(b)State one variable that should be kept the same for this to be a fair test.(1)

(c)Describe the pattern shown by the results.(1)

(d)Predict the number of paperclips that would be picked up with 50 turns of wire, if the pattern in the results continues.(1)

(Total for Question 25 is 4 marks)

A removal man pushes a heavy box a distance of 8 m across a warehouse floor, applying a steady force of 45 N. Using the equation work done = force x distance, calculate the work done. Give the correct unit with your answer.

(Total for Question 26 is 2 marks)

Explain, in terms of forces, why wearing a cycling helmet reduces the risk of a serious head injury in a crash.

(Total for Question 27 is 3 marks)

In a simple series circuit, a battery provides a potential difference (voltage) of 12 V across a single resistor, and a current of 2.5 A flows through the circuit.

(a)Using the equation potential difference = current x resistance (V = I x R), calculate the resistance of the resistor. Give the correct unit with your answer.(2)

(b)Using the equation power = current x potential difference (P = I x V), calculate the power delivered to the resistor. Give the correct unit with your answer.(2)

(Total for Question 28 is 4 marks)

A ship's echo sounder sends a pulse of sound straight down towards the sea floor. The sound is reflected off the sea floor and detected back at the ship 0.8 s after it was sent. The speed of sound in seawater is 1500 m/s.

(a)Explain what is meant by an 'echo'.(1)

(b)Calculate the total distance travelled by the sound pulse (down to the sea floor and back up to the ship) in 0.8 s.(1)

(c)Calculate the depth of the sea floor below the ship.(1)

(d)Suggest why this echo-sounding method would not easily work for measuring the depth of a shallow swimming pool, about 2 m deep.(1)

(Total for Question 29 is 4 marks)

The UK generates electricity from a mix of energy resources, including wind (a renewable resource) and natural gas (a non-renewable fossil fuel). Explain one advantage and one disadvantage of using wind power, and one advantage and one disadvantage of using natural gas, to generate electricity.

(Total for Question 30 is 4 marks)

Mark scheme · CE.S-T8 Science: Full Practice Paper 8

Question 1

B1 B cao
Answer: B) Liver

Question 2

B1 B cao
Answer: B) Carbon dioxide

Question 3

(a) B1 the pH of the solution oe
(a) Answer: The pH of the solution.
(b) B1 any one of: the volume/concentration of pepsin solution; the volume/concentration of the egg-white suspension; the temperature oe
(b) Answer: For example, the temperature of the solutions.
(c) B1 as pH increases from 2 to 7, the time taken for the suspension to clear increases (the reaction gets slower) oe
(c) Answer: As pH increases from 2 to 7, the time taken to clear increases, so the reaction becomes slower.
(d) B1 pH 2 is close to pepsin's optimum pH (matching the acidic conditions of the stomach, where it normally works); at this pH its active site is the best shape to bind to the protein substrate oe
(d) Answer: pH 2 is close to pepsin's optimum pH, matching the acidic stomach; at this pH its active site is the best shape to bind to the protein.

Question 4

(a) B1 continuous cao
(a) Answer: Continuous
(b) B1 discontinuous cao
(b) Answer: Discontinuous

Question 5

(a) B1 contracts (shortens) to bend (flex) the arm at the elbow oe
(a) Answer: The biceps contracts to bend the arm at the elbow.
(b) B1 contracts (shortens) to straighten (extend) the arm at the elbow; relaxes when the biceps contracts, as they form an antagonistic pair oe
(b) Answer: The triceps contracts to straighten the arm at the elbow, working as an antagonistic pair with the biceps.
(c) B1 attaches a muscle to a bone, transferring the force produced when the muscle contracts so that the bone moves oe
(c) Answer: A tendon attaches muscle to bone, transferring the force of a muscle's contraction to move the bone.

Question 6

B1 the lining is folded and covered in villi (finger-like projections), which greatly increases its surface area oe
B1 villi have a very thin wall (one cell thick), which decreases the distance over which digested food has to diffuse, speeding up absorption oe
B1 villi have a good blood supply (many capillaries), which maintains a steep concentration gradient, so digested food is absorbed into the blood quickly oe
Answer: The lining of the small intestine is folded into villi, greatly increasing its surface area. Each villus has a very thin wall, reducing the diffusion distance, and a good blood supply, maintaining a steep concentration gradient, so digested food is absorbed quickly.

Question 7

(a) B1 hawthorn berries (the hawthorn bush) cao
(a) Answer: Hawthorn berries (the hawthorn bush).
(b) B1 primary consumer cao
(b) Answer: Primary consumer.
(c) B1 600 kJ cao (working: 6000 x 0.10)
(c) Answer: 600 kJ
(d) B1 any one of: energy is lost as heat (from respiration); energy is used for movement; some parts of the vole are not eaten or are undigested (egested) by the owl oe
(d) Answer: For example, energy is lost as heat from the vole's respiration.

Question 8

B1 it has a streamlined (smoothly tapered) body shape, which reduces drag/resistance from the water as it swims oe
B1 it has gills with a large surface area, thin walls and a good blood supply, allowing it to absorb dissolved oxygen from the water efficiently oe
B1 it has fins and a muscular tail, which help to propel it forward and control its direction and balance, allowing it to swim against the current oe
Answer: A river fish has a streamlined body to reduce drag, gills with a large surface area and good blood supply to absorb dissolved oxygen efficiently, and fins with a muscular tail to propel itself and control direction against the current.

Question 9

(a) B1 the distance from the tree oe
(a) Answer: The distance from the tree.
(b) B1 any one of: the size of the quadrat (1 m x 1 m); the time of day/weather conditions; the method used to estimate percentage cover oe
(b) Answer: For example, the size of the quadrat used at each point.
(c) B1 as distance from the tree increases, the percentage cover of daisies increases oe
(c) Answer: As distance from the tree increases, the percentage cover of daisies increases.
(d) B1 daisies need light for photosynthesis; closer to the tree there is more shade (less light), so fewer daisies can grow well there oe
(d) Answer: Closer to the tree there is more shade, so daisies receive less light for photosynthesis and fewer can grow well.

Question 10

Level 1 (1-2): Basic, isolated statement(s) about pathogens, vaccines or being protected, with little or no linking to antibodies, memory cells or population-level protection.
Level 2 (3-4): Some relevant ideas about how a vaccine protects an individual (using a weakened/dead pathogen, antibodies, memory cells) are given, but the explanation of how a vaccinated population protects the wider group is incomplete or missing.
Level 3 (5-6): A clear, logically linked explanation covering both how vaccination protects an individual (memory cells, faster secondary immune response) and how a highly vaccinated population protects even unvaccinated people (herd immunity).
Indicative content:
- A vaccine contains a dead or weakened form of a pathogen, or a harmless part of it (such as a protein from its surface).
- When injected, the vaccine causes white blood cells to produce antibodies against that pathogen, without the person becoming seriously ill.
- Some of these white blood cells become memory cells, which remain in the body long after vaccination.
- If the person is later exposed to the real, live pathogen, the memory cells allow the body to produce antibodies much faster and in much greater numbers than the first time (a faster secondary immune response), destroying the pathogen before it can cause disease.
- This means the vaccinated person is protected (immune) against the disease.
- If a high enough proportion of a population is vaccinated, the pathogen struggles to spread from person to person, because there are too few unvaccinated (non-immune) people for it to infect.
- This protects even people in the population who are not vaccinated, or who cannot be vaccinated (such as very young babies), an effect called herd immunity.

Question 11

B1 B cao
Answer: B) Pipette

Question 12

B1 A cao
Answer: A) Chromatography

Question 13

(a) B1 diffusion cao
(a) Answer: Diffusion
(b) B1 gas cao
(b) Answer: Gas

Question 14

(a) B1 where the reactants are mixed together, so the reaction takes place and gas is produced oe
(a) Answer: The conical flask is where the reactants are mixed and the reaction takes place, producing gas.
(b) B1 carries the gas produced away from the flask to where it can be collected/measured oe
(b) Answer: The delivery tube carries the gas produced away from the flask to be collected.
(c) B1 collects the gas by downward displacement of water, allowing its volume to be measured oe
(c) Answer: The inverted measuring cylinder collects the gas by downward displacement of water, allowing its volume to be measured.

Question 15

(a) B1 the mass of manganese oxide (catalyst) added oe
(a) Answer: The mass of manganese oxide added.
(b) B1 any one of: the volume of hydrogen peroxide solution; the concentration of hydrogen peroxide solution; the time allowed (30 s) oe
(b) Answer: For example, the concentration of hydrogen peroxide solution.
(c) B1 as the mass of catalyst increases, the volume of oxygen collected in 30 s increases, but the increase becomes smaller, and the results level off between 1.5 g and 2.0 g oe
(c) Answer: As catalyst mass increases, the volume of oxygen collected increases, but by smaller amounts, levelling off between 1.5 g and 2.0 g.
(d) B1 at this point there is enough catalyst to make the reaction go as fast as the hydrogen peroxide allows; the rate is now limited by the amount/concentration of hydrogen peroxide available, not by the amount of catalyst, so adding more catalyst has little further effect oe
(d) Answer: Beyond this point the rate is limited by the amount of hydrogen peroxide available, not by the amount of catalyst, so adding more catalyst makes little difference.

Question 16

M1 uses conservation of mass: mass of CO2 = mass of CaCO3 - mass of CaO (= 25.0 - 14.0) oe
A1 11.0 g cao
Answer: 11.0 g

Question 17

B1 painting the object, or coating it in oil/grease, or coating it in plastic - this creates a barrier that keeps air and water away from the surface of the iron, preventing rusting oe
B1 galvanising - coating the iron with a thin layer of a more reactive metal, zinc; the zinc reacts (corrodes) in preference to the iron, protecting the iron even if the coating is scratched (sacrificial protection) oe
B1 alloying the iron with other elements, such as chromium and nickel, to make stainless steel, which resists rusting much better than pure iron oe
Answer: Iron can be protected from rusting by coating it (with paint, oil or plastic) to keep out air and water; by galvanising it with a layer of zinc, which corrodes in preference to the iron (sacrificial protection); or by alloying it with metals such as chromium to make stainless steel, which resists rusting.

Question 18

(a) B1 yes, a reaction occurs; copper is more reactive than silver, so copper can displace silver from silver nitrate solution oe
(a) Answer: Yes, a reaction occurs, because copper is more reactive than silver, so it displaces silver from the silver nitrate solution.
(b) B1 grey/silvery crystals (needles) of silver form on the copper strip, and/or the solution turns blue (as copper nitrate forms) oe
(b) Answer: Grey/silvery crystals of silver form on the copper strip, and the solution turns blue.
(c) B1 copper + silver nitrate -> copper nitrate + silver cao
(c) Answer: Copper + silver nitrate -> copper nitrate + silver
(d) B1 no reaction would occur; gold is less reactive than copper, so gold cannot displace copper from copper sulfate solution oe
(d) Answer: No reaction would occur, because gold is less reactive than copper, so it cannot displace copper from copper sulfate solution.

Question 19

(a) B1 forms when molten rock (magma or lava) cools and solidifies, forming crystals oe
(a) Answer: Igneous rock forms when molten rock cools and solidifies, forming crystals.
(b) B1 forms when small pieces of rock, sand, or the remains of organisms (sediment) are deposited in layers, then compacted and cemented together over a long period of time oe
(b) Answer: Sedimentary rock forms when sediment is deposited in layers, then compacted and cemented together over a long time.
(c) B1 forms when an existing rock is changed by high heat and/or pressure, without melting completely, forming new crystals/a new structure oe
(c) Answer: Metamorphic rock forms when an existing rock is changed by heat and/or pressure, without melting completely.

Question 20

(a) B1 the volume of hydrochloric acid added oe
(a) Answer: The volume of hydrochloric acid added.
(b) B1 any one of: the concentration of the acid; the mass of sodium hydrogencarbonate used; the temperature oe
(b) Answer: For example, the concentration of the hydrochloric acid.
(c) B1 as the volume of acid increases, the volume of gas produced increases, up to 30 cm³ of acid, after which it stays the same (levels off) oe
(c) Answer: Gas volume increases as acid volume increases, up to 30 cm³, after which it stays the same.
(d) B1 beyond 30 cm³ all the sodium hydrogencarbonate has already reacted (been used up); the acid is now in excess, so there is nothing left for the extra acid to react with, so no more gas is produced oe
(d) Answer: By 30 cm³ all the sodium hydrogencarbonate has been used up; the acid is now in excess, so extra acid has nothing left to react with.

Question 21

B1 B cao
Answer: B) Voltmeter

Question 22

B1 C cao
Answer: C) Wind

Question 23

(a) B1 infrared cao
(a) Answer: Infrared
(b) B1 γ cao
(b) Answer: Gamma

Question 24

(a) B1 transfers light energy (from the Sun) into electrical energy oe
(a) Answer: A solar panel transfers light energy from the Sun into electrical energy.
(b) B1 transfers the kinetic energy of the wind into electrical energy oe
(b) Answer: A wind turbine transfers the kinetic energy of the wind into electrical energy.
(c) B1 transfers sound energy into electrical energy oe
(c) Answer: A microphone transfers sound energy into electrical energy.
(d) B1 transfers electrical energy into sound energy oe
(d) Answer: A loudspeaker transfers electrical energy into sound energy.

Question 25

(a) B1 the number of turns of wire wrapped around the nail oe
(a) Answer: The number of turns of wire wrapped around the nail.
(b) B1 any one of: the current in the circuit (number/type of cells used); the iron nail used; the type/thickness of wire oe
(b) Answer: For example, the current flowing in the circuit.
(c) B1 as the number of turns increases, the number of paperclips picked up increases, but by a smaller amount each time (the increase levels off) oe
(c) Answer: As the number of turns increases, the number of paperclips picked up increases, but by smaller amounts each time.
(d) B1 awrt 9-10, following the levelling-off pattern of the results oe ft
(d) Answer: Approximately 9 to 10 paperclips.

Question 26

M1 correct substitution: work done = 45 x 8 oe
A1 360 J cao
Answer: 360 J

Question 27

B1 the padding inside a helmet compresses (squashes) on impact, which increases the time taken for the head to slow down (decelerate) to a stop oe
B1 increasing the time over which the head decelerates reduces the force acting on the head, for the same change in speed oe
B1 this smaller force reduces the risk of a serious injury to the skull or brain in a crash oe
Answer: The padding in a helmet compresses on impact, increasing the time taken for the head to stop. Increasing this time reduces the force acting on the head, which reduces the risk of serious injury.

Question 28

(a) M1 correct substitution: 12 = 2.5 x R, or R = 12 / 2.5 oe
(a) A1 4.8 ohms (accept 4.8 Omega) cao
(a) Answer: 4.8 ohms
(b) M1 correct substitution: power = 2.5 x 12 oe
(b) A1 30 W cao
(b) Answer: 30 W

Question 29

(a) B1 a reflection of a sound wave off a surface (here, the sea floor), which is heard/detected some time after the original sound was made oe
(a) Answer: An echo is a reflection of a sound wave off a surface, detected some time after the original sound.
(b) B1 1200 m cao (working: 1500 x 0.8)
(b) Answer: 1200 m
(c) B1 600 m cao ft (working: 1200 / 2)
(c) Answer: 600 m
(d) B1 the reflected pulse would return almost instantly (in a tiny fraction of a second), which would be very difficult to measure/time accurately oe
(d) Answer: The reflected pulse would return almost instantly, which would be very difficult to time accurately.

Question 30

B1 advantage of wind: it is a renewable resource that will not run out, and it produces no carbon dioxide (greenhouse gas) emissions while generating electricity oe
B1 disadvantage of wind: it only generates electricity when the wind is blowing (unreliable/intermittent supply), and wind turbines can be seen as noisy, unsightly or expensive to build oe
B1 advantage of gas: gas power stations can be started up and shut down quickly to match demand (a reliable supply whenever needed), and they are relatively cheap to build oe
B1 disadvantage of gas: it is a non-renewable resource that will eventually run out, and burning it releases carbon dioxide, contributing to global warming (and other pollutants) oe
Answer: Wind power is renewable and produces no carbon dioxide emissions, but it is unreliable because it only works when windy, and turbines can be costly or unpopular. Natural gas power stations are reliable, and can be switched on and off quickly to match demand, but gas is non-renewable and burning it releases carbon dioxide, contributing to global warming.

Science: Full Practice Paper 8 - Worksheets, Questions and Revision

CE.S-T8 Science: Full Practice Paper 8

Question 1

Question 2

Question 3

Question 4

Question 5

Question 6

Question 7

Question 8

Question 9

Question 10

Question 11

Question 12

Question 13

Question 14

Question 15

Question 16

Question 17

Question 18

Question 19

Question 20

Question 21

Question 22

Question 23

Question 24

Question 25

Question 26

Question 27

Question 28

Question 29

Question 30