Science: Full Practice Paper 7 Worksheet with Answers

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CE.S-T7 Science: Full Practice Paper 7

ISEB COMMON ENTRANCE CE.S-T7 · Calculator allowed · about 60 minutes

Total Marks

Name: _______________________________ Date: ____ / ____ / ______

Answer ALL questions. Show all your working.

1

Which structure of a neuron (nerve cell) carries an electrical impulse away from the cell body, towards the next neuron or an effector?

A) Dendrite
B) Axon
C) Synapse
D) Nucleus

(Total for Question 1 is 1 mark)

2

Which pair of muscles works together (as an antagonistic pair) to bend and straighten the arm at the elbow?

A) Biceps and triceps
B) Quadriceps and hamstrings
C) Deltoid and trapezius
D) Gastrocnemius and soleus

(Total for Question 2 is 1 mark)

3

Complete the two missing words in these sentences about genes and chromosomes.

(a)Thread-like structures found in the nucleus of a cell, made of DNA, that carry genetic information, are called ______.(1)

(b)A short section of a chromosome that carries the instructions (code) for one particular characteristic is called a ______.(1)

(Total for Question 3 is 2 marks)

4

Which type of joint, found at the knee and the elbow, allows movement in one plane only, like a door hinge?

A) Hinge joint
B) Ball-and-socket joint
C) Fixed (fused) joint
D) Pivot joint

(Total for Question 4 is 1 mark)

5

Freddie is investigating how wind speed affects the rate of water uptake (which is linked to the rate of transpiration, water loss from the leaves) of a leafy plant shoot. He sets up the same leafy shoot in a sealed tube of water connected to a capillary tube containing a single air bubble, and measures how far the air bubble moves along the capillary tube in five minutes. He repeats this with an electric fan switched off, then on a low setting, then on a high setting, keeping the shoot and its position the same each time.

Fan setting: Off	Low	High
Distance moved by air bubble (mm): 8	19	34

(a)Identify the independent variable in Freddie's investigation.(1)

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

(c)Describe the relationship between wind speed and the distance moved by the air bubble.(1)

(d)Suggest why increasing the wind speed increases the rate of water uptake (transpiration) by the shoot.(1)

(Total for Question 5 is 4 marks)

6

Describe the job of each of these four parts of a leaf in helping it carry out photosynthesis efficiently: the waxy cuticle, the palisade mesophyll layer, the stomata, and the guard cells.

(a)The waxy cuticle.(1)

(b)The palisade mesophyll layer.(1)

(c)The stomata.(1)

(d)The guard cells.(1)

(Total for Question 6 is 4 marks)

7

Plant cells have some structures that animal cells do not have. Explain the function of each of these three structures found in a plant cell: the cell wall, the chloroplasts, and the permanent vacuole.

(Total for Question 7 is 3 marks)

8

Nadia is investigating how pH affects the activity of amylase, an enzyme that breaks down starch into sugars. She mixes the same volume and concentration of amylase solution with the same volume and concentration of starch solution, buffered at four different pH values, and tests a drop of each mixture with iodine solution every 30 seconds, recording the time taken until the mixture no longer turns blue-black with iodine (showing all the starch has been broken down).

pH: 4	6	8	10
Time for starch to disappear (s): 210	60	90	240

(a)Identify the independent variable in Nadia's investigation.(1)

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

(c)State the pH at which amylase worked fastest, using the data to support your answer.(1)

(d)Suggest why the reaction was much slower at pH 4 and pH 10 than at pH 6.(1)

(Total for Question 8 is 4 marks)

9

A reflex action, such as pulling a hand away from a hot object, happens automatically and very quickly. Describe the role of each of these three parts of the reflex arc involved: the receptor, the relay neuron (in the spinal cord), and the effector.

(a)The receptor.(1)

(b)The relay neuron (in the spinal cord).(1)

(c)The effector.(1)

(Total for Question 9 is 3 marks)

10

Explain how vaccination protects an individual against a particular infectious disease, and explain how vaccinating a large proportion of a population can also help to protect people who have not themselves been vaccinated (herd immunity).

(Total for Question 10 is 6 marks)

11

When a sodium atom (Na) reacts to form a sodium ion (Na+), what happens to the atom?

A) It gains one electron
B) It loses one electron
C) It gains one proton
D) It loses one neutron

(Total for Question 11 is 1 mark)

12

Complete the two missing words in these sentences about the periodic table.

(a)A horizontal row of elements across the periodic table is called a ______.(1)

(b)Elements are arranged in the periodic table in order of increasing ______ number.(1)

(Total for Question 12 is 2 marks)

13

Which piece of equipment is used to measure the volume of a gas produced during a chemistry experiment?

A) Measuring cylinder
B) Gas syringe
C) Burette
D) Thermometer

(Total for Question 13 is 1 mark)

14

Priya is investigating the effect of a catalyst on the decomposition of hydrogen peroxide solution, which breaks down into water and oxygen gas. She adds the same volume and concentration of hydrogen peroxide solution to two flasks. She adds a small, identical spatula measure of manganese(IV) oxide powder (a catalyst) to flask A, and adds nothing extra to flask B. She collects the oxygen gas produced by each flask in a gas syringe and records the volume collected after 60 seconds.

Flask: A (with catalyst)	B (no catalyst)
Volume of oxygen collected (cm³): 48	5

(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 what the results show about the effect of the catalyst.(1)

(d)Explain, in terms of activation energy, why a catalyst increases the rate of this reaction.(1)

(Total for Question 14 is 4 marks)

15

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

CaCO3 -> CaO + CO2

In an experiment, 25 g of calcium carbonate is heated strongly until it has fully decomposed, leaving 14 g of calcium oxide. Calculate the mass of carbon dioxide gas released.

(Total for Question 15 is 2 marks)

16

Describe the purpose of each of these two techniques used to separate or investigate mixtures: paper chromatography, and crystallisation.

(a)Paper chromatography.(1)

(b)Crystallisation.(1)

(Total for Question 16 is 2 marks)

17

Dilute hydrochloric acid is added to solid calcium carbonate (marble chips) in a test tube. Name the three types of product formed in this reaction, and describe a test, including the result, that would show that one of these products is carbon dioxide gas.

(Total for Question 17 is 3 marks)

18

Methane gas burns completely in oxygen, forming carbon dioxide and water.

(a)Balance this symbol equation for the complete combustion of methane: CH4 + O2 -> CO2 + H2O(1)

(b)In an experiment, 8 g of methane burns completely, using 32 g of oxygen and producing 18 g of water. Calculate the mass of carbon dioxide produced.(2)

(c)State whether this combustion reaction is exothermic or endothermic, and give a reason for your answer.(1)

(Total for Question 18 is 4 marks)

19

A student wants to prevent an iron garden gate from rusting.

(a)State the two conditions that must both be present for iron to rust.(1)

(b)Name the substance formed when iron rusts.(1)

(c)Describe one method the student could use to prevent the gate from rusting, and explain how it works.(2)

(Total for Question 19 is 4 marks)

20

Some metals, such as gold, are found in the Earth's crust as the pure (native) metal itself, while other metals, such as aluminium and iron, are always found combined with other elements in compounds (ores) and must be extracted using chemical methods. Explain, using ideas about the reactivity series, why different metals need different methods to obtain them from the Earth's crust, referring to at least two different extraction methods in your answer.

(Total for Question 20 is 6 marks)

21

Which type of electromagnetic wave has the shortest wavelength?

A) Radio waves
B) Visible light
C) Infrared radiation
D) Gamma rays

(Total for Question 21 is 1 mark)

22

Which unit is used to measure energy?

A) Newton
B) Joule
C) Watt
D) Pascal

(Total for Question 22 is 1 mark)

23

Complete the two missing words in these sentences about energy resources.

(a)Energy resources such as coal, oil and natural gas, which took millions of years to form and will eventually run out, are called ______ energy resources.(1)

(b)Energy resources such as wind, solar and hydroelectric power, which will not run out because they are naturally replaced, are called ______ energy resources.(1)

(Total for Question 23 is 2 marks)

24

Ben is investigating how the volume of water in a glass bottle affects the pitch (frequency) of the note produced when he blows air across the top of the bottle. He uses four identical bottles, pours in different volumes of water, and uses a frequency-measuring app to record the frequency of the note produced when he blows across each one in the same way.

Volume of water in bottle (ml): 50	150	250	350
Frequency of note produced (Hz): 220	310	440	660

(a)Identify the independent variable in Ben's investigation.(1)

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

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

(d)Suggest why adding more water to the bottle increases the frequency of the note produced.(1)

(Total for Question 24 is 4 marks)

25

A pupil connects a resistor of resistance 4 ohm to a 6 V battery in a simple circuit.

(a)Using the formula voltage = current x resistance (V = I x R), calculate the current flowing through the resistor.(2)

(b)Using the formula power = voltage x current (P = V x I), calculate the power dissipated by the resistor.(1)

(Total for Question 25 is 3 marks)

26

A filament lamp is designed to transfer electrical energy into light energy. However, not all of the energy supplied to the lamp ends up as light.

(a)State the useful energy transfer that takes place in the filament lamp.(1)

(b)State what happens to the rest of the energy supplied to the lamp, and name the form this wasted energy usually takes.(1)

(c)State the principle of conservation of energy that links the useful and wasted energy transferred by the lamp.(1)

(d)Suggest one way of reducing the amount of energy wasted by a lighting system, other than changing the design of the filament lamp itself.(1)

(Total for Question 26 is 4 marks)

27

Explain, using ideas about forces, why a skydiver falling through the air reaches a maximum, constant speed, called terminal velocity, before opening their parachute.

(Total for Question 27 is 4 marks)

28

Grace is investigating the law of reflection using a ray box, a plane (flat) mirror, and a protractor. She directs a ray of light at the mirror at different angles, measured from the normal (a line at right angles to the mirror), and measures the angle of the reflected ray, also from the normal.

Angle of incidence (degrees): 20	35	50	65
Angle of reflection (degrees): 20	35	50	65

(a)Identify the independent variable in Grace's investigation.(1)

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

(c)Describe the relationship shown by the results between the angle of incidence and the angle of reflection.(1)

(d)State the name given to this relationship between the angle of incidence and the angle of reflection.(1)

(Total for Question 28 is 4 marks)

29

An electric motor is supplied with 40 J of electrical energy. Of this, 30 J is usefully transferred to kinetic energy, and the rest is wasted as heat and sound. Using the formula efficiency = (useful energy output / total energy input) x 100%, calculate the efficiency of the motor.

(Total for Question 29 is 2 marks)

30

A removal man pushes a sofa a distance of 8 m across a room floor, applying a constant horizontal force of 45 N.

(a)Using the formula work done = force x distance, calculate the work done in pushing the sofa.(2)

(b)State what would happen to the work done if the sofa were pushed the same distance using a smaller force.(1)

(Total for Question 30 is 3 marks)

Mark scheme · CE.S-T7 Science: Full Practice Paper 7

Question 1

B1 B cao
Answer: B) Axon

Question 2

B1 A cao
Answer: A) Biceps and triceps

Question 3

(a) B1 chromosomes cao
(a) Answer: Chromosomes
(b) B1 gene cao
(b) Answer: Gene

Question 4

B1 A cao
Answer: A) Hinge joint

Question 5

(a) B1 the wind speed (the fan setting) oe
(a) Answer: The wind speed (fan setting).
(b) B1 any one of: the plant shoot used; the number/size of leaves on the shoot; the light level; the temperature; the time allowed (5 minutes); the starting position of the air bubble oe
(b) Answer: For example, the number and size of leaves on the shoot.
(c) B1 as wind speed increases, the distance moved by the air bubble (the rate of water uptake) increases oe
(c) Answer: As wind speed increases, the distance moved by the air bubble increases.
(d) B1 wind removes water vapour from around the leaves (from just outside the stomata) more quickly, maintaining a steep diffusion gradient, so more water vapour diffuses out of the leaf and more water is drawn up the stem to replace it oe
(d) Answer: Wind blows water vapour away from around the leaves more quickly, keeping a steep concentration gradient so more water vapour diffuses out and more water is drawn up to replace it.

Question 6

(a) B1 a waterproof layer on the upper surface of the leaf that reduces water loss (evaporation) from the leaf oe
(a) Answer: The waxy cuticle is a waterproof layer that reduces water loss from the leaf.
(b) B1 contains many chloroplasts and is packed near the top of the leaf, where it absorbs most of the light for photosynthesis oe
(b) Answer: The palisade mesophyll layer contains many chloroplasts, packed near the top of the leaf, to absorb light for photosynthesis.
(c) B1 small pores (openings), mainly on the underside of the leaf, that allow gases (carbon dioxide in, oxygen and water vapour out) to diffuse in and out of the leaf oe
(c) Answer: The stomata are small pores that allow carbon dioxide to diffuse in and oxygen and water vapour to diffuse out.
(d) B1 a pair of cells surrounding each stoma that can change shape to open or close the stoma, controlling gas exchange and water loss oe
(d) Answer: The guard cells surround each stoma and change shape to open or close it, controlling gas exchange and water loss.

Question 7

B1 the cell wall, made of cellulose, surrounds the cell membrane and provides support/strength, keeping the cell's shape rigid oe
B1 chloroplasts contain the green pigment chlorophyll, which absorbs light energy for photosynthesis oe
B1 the permanent vacuole contains cell sap and helps to keep the cell turgid (firm/rigid), which helps support the plant oe
Answer: The cell wall, made of cellulose, supports the cell and keeps its shape rigid. Chloroplasts contain chlorophyll, which absorbs light energy for photosynthesis. The permanent vacuole contains cell sap and keeps the cell turgid, helping to support the plant.

Question 8

(a) B1 pH (of the buffered mixture) oe
(a) Answer: pH.
(b) B1 any one of: the volume/concentration of amylase solution; the volume/concentration of starch solution; the temperature; the volume of iodine used to test oe
(b) Answer: For example, the temperature of the mixtures.
(c) B1 pH 6; because it had the shortest time for the starch to disappear (60 s), which was faster than at pH 4, 8 or 10 oe
(c) Answer: pH 6, because it had the shortest time (60 s) for the starch to disappear.
(d) B1 at pH values far from the enzyme's optimum, the shape of the enzyme's active site is changed (denatured), so it cannot bind to (break down) the starch as effectively, slowing the reaction oe
(d) Answer: At pH values far from the optimum, the shape of amylase's active site is changed (denatured), so it cannot break down starch as effectively.

Question 9

(a) B1 detects the stimulus (e.g. heat/pain) and converts it into an electrical impulse oe
(a) Answer: The receptor detects the stimulus and converts it into an electrical impulse.
(b) B1 passes the impulse from a sensory neuron to a motor neuron within the spinal cord, without the signal having to travel to (and be processed by) the brain, making the reflex fast oe
(b) Answer: The relay neuron passes the impulse from the sensory neuron to the motor neuron in the spinal cord, without it needing to travel to the brain, making the response fast.
(c) B1 a muscle (or gland) that carries out the response, e.g. a muscle contracting to pull the hand away oe
(c) Answer: The effector is a muscle that carries out the response, for example contracting to pull the hand away.

Question 10

Level 1 (1-2): Basic, isolated statement(s) about vaccination or disease, with little or no linking to antibodies, memory cells, or how unvaccinated people might be protected.
Level 2 (3-4): Some relevant ideas about how vaccination causes the body to produce antibodies/memory cells are given, but the explanation of how an unvaccinated individual can also be protected (herd immunity) is incomplete or not fully linked.
Level 3 (5-6): A clear, logically linked explanation of how vaccination triggers an immune response leading to future protection, and how immunising most of a population reduces the spread of the pathogen, protecting unvaccinated individuals too.
Indicative content:
- A vaccine contains a small, safe amount of a dead or inactive pathogen (or parts of it, such as antigens), which is introduced into the body, e.g. by injection.
- The white blood cells recognise the antigens on the pathogen as foreign and produce antibodies against them, as part of an immune response.
- Some white blood cells become memory cells, which remain in the body for a long time (sometimes for life) after the 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 larger numbers than before, destroying the pathogen before it can cause disease/symptoms.
- If a large proportion of a population is vaccinated, the pathogen has far fewer people it can infect and pass between, so it struggles to spread through the population.
- This means that even people who have not been vaccinated (e.g. those who cannot be, for medical reasons) are less likely to come into contact with the pathogen, because it is not circulating widely; this indirect protection of a population is called herd immunity.

Question 11

B1 B cao
Answer: B) It loses one electron

Question 12

(a) B1 period cao
(a) Answer: Period
(b) B1 atomic cao
(b) Answer: Atomic

Question 13

B1 B cao
Answer: B) Gas syringe

Question 14

(a) B1 whether a catalyst (manganese(IV) oxide) was added or not oe
(a) Answer: Whether a catalyst was added.
(b) B1 any one of: the volume of hydrogen peroxide solution; the concentration of hydrogen peroxide solution; the temperature; the time allowed (60 seconds) oe
(b) Answer: For example, the concentration of hydrogen peroxide solution.
(c) B1 the catalyst greatly increases the rate of the reaction, since almost ten times as much oxygen (48 cm³ compared with 5 cm³) was collected in the same time when the catalyst was used oe
(c) Answer: The catalyst greatly increases the rate of reaction: almost ten times as much oxygen was collected in the same time when it was used.
(d) B1 a catalyst provides an alternative reaction pathway that has a lower activation energy, so more particles have enough energy to react when they collide, speeding up the reaction (the catalyst itself is not used up) oe
(d) Answer: A catalyst provides an alternative pathway with a lower activation energy, so more particle collisions have enough energy to react, speeding up the reaction, without the catalyst itself being used up.

Question 15

M1 using conservation of mass: mass of CO2 = mass of CaCO3 - mass of CaO oe
A1 11 g cao
Answer: 11 g

Question 16

(a) B1 used to separate the different dyes/substances dissolved in a mixture (e.g. in ink), based on how far each one travels up (moves through) a piece of chromatography paper oe
(a) Answer: Paper chromatography separates the different dyes or substances in a mixture, based on how far each moves up the paper.
(b) B1 used to obtain solid crystals of a dissolved (soluble) solid from its solution, by slowly evaporating the solvent so that the solid forms crystals oe
(b) Answer: Crystallisation obtains solid crystals of a dissolved solid from its solution, by slowly evaporating the solvent.

Question 17

B1 the products are a salt (calcium chloride), water, and carbon dioxide gas oe
B1 test: bubble/pass the gas through limewater oe
B1 result: the limewater turns cloudy/milky, confirming the gas is carbon dioxide oe
Answer: The products are a salt (calcium chloride), water, and carbon dioxide gas. To test for carbon dioxide, the gas is bubbled through limewater; the limewater turns cloudy (milky), confirming it is carbon dioxide.

Question 18

(a) B1 CH4 + 2O2 -> CO2 + 2H2O cao
(a) Answer: CH4 + 2O2 -> CO2 + 2H2O
(b) M1 total mass of reactants = 8 + 32 (= 40 g) oe
(b) A1 22 g cao (working: 40 - 18)
(b) Answer: 22 g
(c) B1 exothermic; because burning (combustion) releases energy/heat to the surroundings oe
(c) Answer: Exothermic, because combustion releases heat energy to the surroundings.

Question 19

(a) B1 water (moisture) and oxygen (air) must both be present oe
(a) Answer: Water and oxygen must both be present.
(b) B1 hydrated iron oxide (accept iron oxide/rust) oe
(b) Answer: Hydrated iron oxide (rust).
(c) B1 for a valid method, e.g. painting the gate, coating it in oil/grease, or galvanising it with a layer of zinc oe
(c) B1 for a matching explanation: the coating forms a barrier that keeps water and/or oxygen away from the iron surface, so it cannot react with them oe; or, for galvanising specifically: zinc is more reactive than iron, so it reacts (corrodes) in preference to the iron, sacrificially protecting it even if the coating is scratched oe
(c) Answer: For example, painting the gate; the paint forms a barrier that keeps water and oxygen away from the iron surface, preventing rusting.

Question 20

Level 1 (1-2): Basic, isolated statement(s) about metals or extraction, with little or no reference to the reactivity series or a named extraction method.
Level 2 (3-4): Some relevant ideas about reactivity affecting how a metal is extracted are given, with at least one named method, but the explanation of why different methods are needed is incomplete or not fully linked to reactivity.
Level 3 (5-6): A clear, logically linked explanation of how a metal's position in the reactivity series determines whether it is found native or must be extracted, and why different reactivities require different named extraction methods (e.g. heating, reduction with carbon, or electrolysis).
Indicative content:
- Very unreactive metals, such as gold, are found in the Earth's crust as the uncombined (native) element, because they do not readily react with other elements, so they can simply be dug up/mined.
- Metals that are moderately reactive, such as iron, are found combined in compounds (ores) but can be extracted by heating the ore with carbon; carbon is more reactive than these metals, so it displaces (reduces) the metal from its compound.
- Metals that are very reactive, such as aluminium or sodium, are too reactive to be extracted using carbon, because carbon is not reactive enough to displace them from their compounds.
- These very reactive metals must instead be extracted using electrolysis, which uses electrical energy to break down (decompose) the molten compound into the metal and another element/compound.
- In general, the more reactive a metal is, the more strongly it is held in its compound, and the more difficult (and energy-intensive/expensive) it is to extract.
- This explains why gold needs no chemical extraction at all, iron can be extracted by the cheaper method of heating with carbon, and aluminium requires the more expensive method of electrolysis.

Question 21

B1 D cao
Answer: D) Gamma rays

Question 22

B1 B cao
Answer: B) Joule

Question 23

(a) B1 non-renewable cao
(a) Answer: Non-renewable
(b) B1 renewable cao
(b) Answer: Renewable

Question 24

(a) B1 the volume of water in the bottle oe
(a) Answer: The volume of water in the bottle.
(b) B1 any one of: the bottle used (its size/shape); the way he blew across the bottle (force/angle); the type of liquid (water) used oe
(b) Answer: For example, the way he blew across each bottle.
(c) B1 as the volume of water in the bottle increases, the frequency (pitch) of the note produced increases oe
(c) Answer: As the volume of water increases, the frequency (pitch) of the note increases.
(d) B1 adding water reduces the length (volume) of the column of air above the water, inside the bottle; a shorter air column vibrates at a higher frequency, producing a higher-pitched note oe
(d) Answer: Adding water reduces the length of the air column above it; a shorter air column vibrates at a higher frequency, giving a higher-pitched note.

Question 25

(a) M1 correct rearrangement/substitution: current = voltage / resistance = 6 / 4 oe
(a) A1 1.5 A cao
(a) Answer: 1.5 A
(b) B1 9 W cao (working: 6 x 1.5) ft from (a)
(b) Answer: 9 W

Question 26

(a) B1 electrical energy is transferred to light energy oe
(a) Answer: Electrical energy is transferred to light energy.
(b) B1 the rest of the energy is wasted, mostly transferred to (heat/thermal energy in) the surroundings oe
(b) Answer: The rest of the energy is wasted, mostly as heat (thermal energy) transferred to the surroundings.
(c) B1 energy cannot be created or destroyed, only transferred from one store/form to another, so the total energy transferred (useful + wasted) equals the total energy supplied to the lamp oe
(c) Answer: Energy cannot be created or destroyed, only transferred; the useful energy plus the wasted energy equals the total energy supplied.
(d) B1 any one of: replace the filament lamp with a more efficient type of lamp, such as an LED bulb; only switch lights on when needed; use lower-power bulbs where full brightness is not needed oe
(d) Answer: For example, replacing the filament lamp with a more efficient LED bulb.

Question 27

B1 as the skydiver falls, their weight (the force of gravity) acts downwards and stays constant oe
B1 at first, weight is greater than air resistance (the upward force acting on the skydiver), so there is a resultant force downwards and the skydiver accelerates oe
B1 as the skydiver's speed increases, the air resistance acting on them also increases oe
B1 eventually, air resistance becomes equal to weight, so the resultant force is zero and the skydiver falls at a constant speed (terminal velocity) oe
Answer: The skydiver's weight acts downwards and stays constant. At first weight is greater than air resistance, so there is a resultant force and the skydiver accelerates. As speed increases, air resistance increases too, until it becomes equal to weight; the resultant force is then zero, so the skydiver falls at a constant speed, called terminal velocity.

Question 28

(a) B1 the angle of incidence oe
(a) Answer: The angle of incidence.
(b) B1 any one of: the mirror used; the ray box (light source) used; the position of the mirror oe
(b) Answer: For example, the mirror used.
(c) B1 the angle of reflection is always equal to the angle of incidence oe
(c) Answer: The angle of reflection is always equal to the angle of incidence.
(d) B1 the law of reflection oe
(d) Answer: The law of reflection.

Question 29

M1 correct substitution: efficiency = (30 / 40) x 100 oe
A1 75% cao
Answer: 75%

Question 30

(a) M1 correct substitution: work done = 45 x 8 oe
(a) A1 360 J cao
(a) Answer: 360 J
(b) B1 the work done would be less (smaller) oe
(b) Answer: The work done would be less.

Science: Full Practice Paper 7 - Worksheets, Questions and Revision

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CE.S-T7 Science: Full Practice Paper 7

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