Science: Full Practice Paper 3 Worksheet with Answers

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CE.S-T3 Science: Full Practice Paper 3

ISEB COMMON ENTRANCE CE.S-T3 · Calculator allowed · about 60 minutes

Total Marks

Name: _______________________________ Date: ____ / ____ / ______

Answer ALL questions. Show all your working.

1

Which type of blood cell mainly helps to fight infection in the body?

A) Red blood cells
B) White blood cells
C) Platelets
D) Plasma

(Total for Question 1 is 1 mark)

2

Which change of state happens when a solid turns directly into a gas, without becoming a liquid first?

A) Melting
B) Freezing
C) Sublimation
D) Condensation

(Total for Question 2 is 1 mark)

3

Which force acts on a falling parachutist to slow them down once their parachute opens?

A) Gravity
B) Air resistance
C) Upthrust
D) Magnetism

(Total for Question 3 is 1 mark)

4

Which gas makes up the largest percentage of the Earth's atmosphere?

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

(Total for Question 4 is 1 mark)

5

Which piece of equipment should be used to measure the volume of a liquid accurately?

A) Balance
B) Measuring cylinder
C) Thermometer
D) Stopwatch

(Total for Question 5 is 1 mark)

6

In which type of circuit will the other bulbs stay lit if one bulb is removed?

A) Series circuit
B) Parallel circuit
C) Open circuit
D) Short circuit

(Total for Question 6 is 1 mark)

7

Tariq is investigating whether the concentration of a disinfectant affects how quickly it kills bacteria growing on an agar plate. He tests four different concentrations of disinfectant, keeping the type of bacteria, the volume of disinfectant, and the temperature the same each time.

(a)State the independent variable in Tariq's investigation.(1)

(b)State the dependent variable in Tariq's investigation.(1)

(Total for Question 7 is 2 marks)

8

Complete the two missing words in these sentences about separating mixtures.

(a)Separating a mixture of two liquids with different boiling points, by heating the mixture and collecting and cooling the vapour given off, is called ______.(1)

(b)Separating the different dyes in a mixture, by letting a solvent carry them at different speeds up a piece of paper, is called ______.(1)

(Total for Question 8 is 2 marks)

9

Priya is investigating how the type of surface affects the force of friction acting on a wooden block. She pulls the same block, loaded with the same weights, at a steady speed across three different surfaces (carpet, tile and sandpaper) using a newtonmeter (forcemeter).

(a)State the independent variable in Priya's investigation.(1)

(b)State the dependent variable in Priya's investigation.(1)

(Total for Question 9 is 2 marks)

10

Complete the two missing words in these sentences about nutrients in a healthy diet.

(a)A nutrient needed mainly for the growth and repair of body cells is called ______.(1)

(b)A nutrient that provides the body with a quick, readily available source of energy is called ______.(1)

(Total for Question 10 is 2 marks)

11

A pupil hangs different weights on a spring and measures its extension (the increase in length from its natural length).

Force (N): 1	2	3	4	5
Extension (mm): 10	20	30	40	40

(a)Calculate the extension between 2 N and 3 N.(1)

(b)Explain what the result between 4 N and 5 N shows about the spring.(1)

(c)Suggest one check the pupil could carry out, after removing all the weights, to confirm the spring has passed its elastic limit.(1)

(Total for Question 11 is 3 marks)

12

A pupil burns different masses of magnesium ribbon in a crucible and measures the mass of magnesium oxide formed.

Mass of magnesium (g): 0.3	0.6	0.9	1.2
Mass of magnesium oxide (g): 0.5	1.0	1.5	2.0

(a)Calculate the mass of oxygen that combined with 0.6 g of magnesium to form 1.0 g of magnesium oxide.(1)

(b)Predict the mass of magnesium oxide that would form from 1.5 g of magnesium, if the pattern in the table continues.(1)

(c)Explain, in terms of conservation of mass, why the mass of magnesium oxide formed is always greater than the mass of magnesium burned.(1)

(Total for Question 12 is 3 marks)

13

Describe the job of each of these three parts of the human skeleton: the skull, the ribcage, and the backbone (spine).

(Total for Question 13 is 3 marks)

14

Beatrice is investigating how the surface area of calcium carbonate (marble) affects the rate at which it reacts with dilute hydrochloric acid. She reacts the same mass of marble, either as large chips or as powder, with acid, timing how long it takes for the fizzing (effervescence) to stop.

(a)Name the variable Beatrice must change in her investigation.(1)

(b)Name two variables Beatrice must keep the same to make this a fair test.(2)

(Total for Question 14 is 3 marks)

15

Explain, using ideas about forces, why a block of wood floats when placed in water, but a similarly sized block of steel sinks.

(Total for Question 15 is 3 marks)

16

A pupil measures how much of a salt dissolves in 100 cm3 of water at different temperatures, stirring until no more will dissolve.

Temperature (degC): 20	40	60	80
Mass of salt dissolved (g): 36	38	52	46

(a)Identify which temperature's result is anomalous.(1)

(b)Suggest one reason this anomalous result might have occurred.(1)

(c)Calculate the mean mass of salt dissolved using only the three temperatures that are not anomalous.(1)

(Total for Question 16 is 3 marks)

17

Explain why both breathing rate and heart rate increase during exercise, referring to respiration.

(Total for Question 17 is 3 marks)

18

Describe the main energy transfer that takes place when someone uses a hand-cranked (dynamo) torch to produce light, without any battery.

(Total for Question 18 is 3 marks)

19

The equation below shows magnesium reacting with hydrochloric acid:

Mg(s) + 2HCl(aq) -> MgCl2(aq) + H2(g)

Describe what each of these four state symbols tells us about the substance written next to it: the (s) after Mg, the first (aq) after HCl, the second (aq) after MgCl2, and the (g) after H2.

(Total for Question 19 is 4 marks)

20

A pupil investigates how temperature affects how quickly the enzyme amylase breaks down starch. She mixes amylase with starch solution at different temperatures and uses the iodine test every 30 seconds to see how long the mixture takes to stop turning blue-black (showing all the starch has been broken down).

Temperature (degC): 10	37	50	80
Time for starch to disappear (s): 300	30	60	no change after 10 minutes

(a)State which temperature gave the fastest reaction.(1)

(b)Explain why the reaction was slower at 50 degC than at 37 degC, even though 50 degC is a higher temperature.(1)

(c)Explain why no reaction happened at all at 80 degC.(1)

(d)Suggest one improvement to make this investigation more reliable.(1)

(Total for Question 20 is 4 marks)

21

Explain how convection currents transfer thermal energy through a pan of water that is being heated from below, referring to density.

(Total for Question 21 is 4 marks)

22

Describe the property that makes each of these four materials well suited to its stated use: copper for electrical wiring, PVC (plastic) for the wire's outer coating, aluminium for aircraft bodies, and diamond for cutting tools.

(Total for Question 22 is 4 marks)

23

Describe the job of each of these four parts of the human eye: the cornea, the iris, the lens, and the retina.

(Total for Question 23 is 4 marks)

24

A pupil investigates how the length of a piece of resistance wire affects the current flowing through it, keeping the voltage across the wire the same each time.

Length of wire (cm): 10	20	30	40
Current (A): 0.80	0.40	0.27	0.20

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

(b)Predict the current if a 50 cm length of the same wire were used, if the pattern continues.(1)

(c)Explain, in terms of resistance, why the current decreases as the wire gets longer.(1)

(d)Suggest one other change to the wire that would increase its resistance, other than increasing its length.(1)

(Total for Question 24 is 4 marks)

25

Describe the job of each of these four parts of the human ear: the pinna (outer ear), the eardrum, the ossicles (the tiny bones of the middle ear), and the cochlea.

(Total for Question 25 is 4 marks)

26

Explain the difference between an exothermic reaction and an endothermic reaction, giving an example of each, and state one everyday use of an exothermic reaction.

(Total for Question 26 is 3 marks)

27

A pupil wants to find out which of three magnets is strongest, by testing how many paperclips each magnet can pick up through a piece of card. He tests Magnet 1 through a thin card, Magnet 2 through a medium card, and Magnet 3 through a thick card.

(a)Identify one part of the method that makes this comparison unfair.(1)

(b)Suggest an improvement to make the comparison fairer.(1)

(c)Predict what would happen to the number of paperclips picked up if the same magnet were tested through a thicker card instead, and explain why, referring to magnetic field strength.(1)

(d)Suggest one way to make the comparison more reliable.(1)

(Total for Question 27 is 4 marks)

28

Explain four ways a polar bear is adapted to survive in a cold Arctic environment.

(Total for Question 28 is 4 marks)

29

A pupil measures the mass and volume of four metal blocks, each made from a different metal, in order to calculate their density using density = mass / volume.

Block: J	K	L	M
Mass (g): 54	89	78.5	193
Volume (cm3): 20	10	10	10

(a)Calculate the density of Block J.(1)

(b)Using the results, which block has the greatest density?(1)

(c)Block J is suspected to be made of aluminium, which has a density of about 2.7 g/cm3. Does the calculated density support this? Explain.(1)

(d)A pupil says: 'Block K must be denser than Block L because it has a greater mass.' Suggest why this reasoning is flawed.(1)

(Total for Question 29 is 4 marks)

30

A class investigates which type of exercise increases pulse rate the most: walking, jogging, or star jumps. Each pupil rests until their pulse rate is steady, measures their resting pulse rate, then does one activity for 2 minutes before measuring their pulse rate again.

Activity: Walking	Jogging	Star jumps
Resting pulse (bpm): 70	72	71
Pulse after 2 min (bpm): 82	110	128

(a)State two variables the class kept the same to make this a fair test.(2)

(b)Using the results, which activity increased pulse rate the most?(1)

(c)Suggest a scientific reason, related to muscles and oxygen demand, why star jumps increased pulse rate the most.(2)

(d)Suggest one way the class could improve the reliability of their conclusion.(1)

(Total for Question 30 is 6 marks)

Mark scheme · CE.S-T3 Science: Full Practice Paper 3

Question 1

B1 B cao
Answer: B) White blood cells

Question 2

B1 C cao
Answer: C) Sublimation

Question 3

B1 B cao
Answer: B) Air resistance

Question 4

B1 B cao
Answer: B) Nitrogen

Question 5

B1 B cao
Answer: B) Measuring cylinder

Question 6

B1 B cao
Answer: B) Parallel circuit

Question 7

(a) B1 the concentration of the disinfectant oe
(a) Answer: The concentration of the disinfectant.
(b) B1 the time taken to kill the bacteria (or the amount/area of bacteria killed) oe
(b) Answer: The time taken for the disinfectant to kill the bacteria.

Question 8

(a) B1 distillation cao
(a) Answer: Distillation
(b) B1 chromatography cao
(b) Answer: Chromatography

Question 9

(a) B1 the type of surface (carpet, tile or sandpaper) oe
(a) Answer: The type of surface.
(b) B1 the force of friction (the reading on the newtonmeter/forcemeter) oe
(b) Answer: The force of friction, read from the newtonmeter.

Question 10

(a) B1 protein cao
(a) Answer: Protein
(b) B1 carbohydrate cao
(b) Answer: Carbohydrate

Question 11

(a) B1 10 mm cao
(a) Answer: 10 mm
(b) B1 the extension has stopped increasing (it stays at 40 mm), showing the spring has been stretched beyond its elastic limit (limit of proportionality) oe
(b) Answer: The spring has been stretched beyond its elastic limit, since the extension stays at 40 mm and does not increase further between 4 N and 5 N.
(c) B1 measure the spring's length once the weights are removed, to see if it has returned to its original (natural) length oe
(c) Answer: Measure the spring's length with the weights removed, to see whether it has returned to its original length.

Question 12

(a) B1 0.4 g cao
(a) Answer: 0.4 g
(b) B1 2.5 g cao
(b) Answer: 2.5 g
(c) B1 oxygen from the air joins with (chemically combines with) the magnesium, adding its mass to the solid product, so the total mass of reactants (magnesium plus oxygen) equals the mass of magnesium oxide formed oe
(c) Answer: Oxygen from the air combines with the magnesium during burning, and this extra oxygen's mass is added to the solid product, so the magnesium oxide has a greater mass than the magnesium alone.

Question 13

B1 skull: protects the brain oe
B1 ribcage: protects the heart and lungs (and helps with breathing) oe
B1 backbone/spine: protects the spinal cord and supports the body, allowing it to bend oe
Answer: The skull protects the brain; the ribcage protects the heart and lungs; the backbone (spine) protects the spinal cord and supports the body while allowing it to bend.

Question 14

(a) B1 the surface area of the marble (chips versus powder) oe
(a) Answer: The surface area of the marble (whether it is chips or powder).
(b) B1 the mass of marble used oe
(b) B1 the volume and concentration of acid used (or the temperature) oe
(b) Answer: The mass of marble used and the volume/concentration of acid used.

Question 15

B1 an object floats when the upthrust (upward force) from the water is equal to (balances) its weight oe
B1 wood has a lower density than water, so a block of wood only needs to sink a little way before it displaces enough water to produce an upthrust equal to its weight, so it floats oe
B1 steel has a greater density than water, so even when fully submerged the upthrust it produces is smaller than its weight, so the resultant force is downward and it sinks oe
Answer: An object floats when the upward force (upthrust) from the water balances its weight. Wood is less dense than water, so it only needs to displace a small amount of water to balance its weight and floats; steel is denser than water, so even fully submerged its upthrust cannot balance its greater weight, so it sinks.

Question 16

(a) B1 60 degC (52 g) cao
(a) Answer: 60 degC (52 g).
(b) B1 any plausible reason, e.g. a measuring/weighing error, some undissolved solid was mistakenly included, or not enough time was allowed for the salt to fully dissolve at the other temperatures oe
(b) Answer: For example, the pupil may have made a weighing error, or included some undissolved solid by mistake when measuring the mass at 60 degC.
(c) B1 40 g cao
(c) Answer: 40 g

Question 17

B1 working muscles need more energy during exercise, so they carry out (aerobic) respiration at a faster rate oe
B1 faster respiration uses up oxygen and glucose more quickly and produces carbon dioxide more quickly oe
B1 breathing rate increases to take in oxygen and remove carbon dioxide faster, and heart rate increases to pump oxygenated blood to the muscles (and carbon dioxide away from them) more quickly oe
Answer: During exercise, muscles need more energy and so respire faster, using oxygen and producing carbon dioxide more quickly. Breathing rate increases to supply oxygen and remove carbon dioxide faster, and heart rate increases to pump oxygen to the muscles and carbon dioxide away from them more quickly.

Question 18

B1 turning the handle transfers energy from the person's kinetic energy store (the movement of their hand) into the dynamo/generator oe
B1 the dynamo/generator transfers this energy into electrical energy, which flows to the bulb (or LED) oe
B1 the bulb transfers most of this electrical energy usefully into light, but some is wasted as thermal energy oe
Answer: The kinetic energy of the person's turning hand is transferred by the dynamo into electrical energy, which is then transferred by the bulb mostly into useful light, with some wasted as thermal energy.

Question 19

B1 (s) after Mg: the magnesium is a solid at the start of the reaction oe
B1 (aq) after HCl: the hydrochloric acid is dissolved in water (an aqueous solution) oe
B1 (aq) after MgCl2: the magnesium chloride formed is dissolved in the water in the flask (an aqueous solution) oe
B1 (g) after H2: the hydrogen produced is a gas, which bubbles off/escapes oe
Answer: (s) shows the magnesium starts as a solid; the first (aq) shows the hydrochloric acid is dissolved in water; the second (aq) shows the magnesium chloride formed is also dissolved in the water; (g) shows the hydrogen produced is a gas that escapes as bubbles.

Question 20

(a) B1 37 degC cao
(a) Answer: 37 degC
(b) B1 above its optimum temperature the enzyme's shape starts to change (it begins to denature), so it no longer fits its substrate (starch) as well, slowing the reaction compared with the optimum oe
(b) Answer: Above the enzyme's optimum temperature of 37 degC, its shape starts to change (it begins to denature), so it no longer fits the starch as well, making the reaction slower than at 37 degC.
(c) B1 at 80 degC the enzyme is fully (permanently) denatured, its active site has changed shape and can no longer bind to (break down) the starch oe
(c) Answer: At 80 degC the enzyme is fully denatured; its active site has permanently changed shape, so it can no longer bind to the starch and break it down.
(d) B1 repeat the test at each temperature (e.g. three times) and calculate a mean time oe
(d) Answer: Repeat the test at each temperature several times and calculate a mean time for the starch to disappear.

Question 21

B1 water at the bottom of the pan is heated directly (by conduction from the hot pan) oe
B1 as this water is heated, its particles gain energy, move further apart, and it expands, becoming less dense than the water above it oe
B1 the warmer, less dense water rises, while cooler, denser water sinks to take its place oe
B1 this sets up a continuous circulating (convection) current, which transfers thermal energy throughout the water oe
Answer: Water at the bottom of the pan is heated directly by the hot pan. Its particles gain energy, spread out and become less dense, so it rises, while cooler, denser water sinks to take its place. This circulating movement (a convection current) continues, transferring thermal energy throughout the pan.

Question 22

B1 copper: a good conductor of electricity, so current flows through it easily oe
B1 PVC: an electrical insulator (and flexible), so it stops the user getting an electric shock and can bend around corners oe
B1 aluminium: has a low density (is light) but is strong, so it keeps the aircraft light while remaining strong enough oe
B1 diamond: extremely hard, so it can cut through even other very hard materials oe
Answer: Copper is a good electrical conductor, so it carries current well; PVC is an electrical insulator and flexible, so it protects users and bends easily; aluminium has low density but is strong, keeping aircraft light yet sturdy; diamond is extremely hard, letting it cut other hard materials.

Question 23

B1 cornea: the transparent front layer that refracts (bends) light as it enters the eye oe
B1 iris: the coloured ring of muscle that controls the size of the pupil, controlling how much light enters oe
B1 lens: transparent structure that changes shape to focus light onto the retina oe
B1 retina: light-sensitive layer at the back of the eye that detects light and sends signals to the brain (via the optic nerve) oe
Answer: The cornea refracts light as it enters the eye; the iris controls the size of the pupil and so how much light enters; the lens changes shape to focus light onto the retina; the retina detects light and sends signals to the brain via the optic nerve.

Question 24

(a) B1 as the length of the wire increases, the current decreases oe
(a) Answer: As the length of the wire increases, the current flowing through it decreases.
(b) B1 0.16 A cao
(b) Answer: 0.16 A
(c) B1 a longer wire has a greater resistance (more collisions between the charge carriers and the wire's particles/ions), so for the same voltage a smaller current flows oe
(c) Answer: A longer wire has a greater resistance, because there are more collisions between the charge carriers and the particles of the wire; for the same voltage, this means a smaller current flows.
(d) B1 use a thinner wire, or a wire made of a different material with higher resistivity (or increase its temperature) oe
(d) Answer: Use a thinner wire (smaller cross-sectional area), or a wire made from a material with higher resistivity.

Question 25

B1 pinna: collects and funnels sound waves into the ear canal oe
B1 eardrum: a thin membrane that vibrates when sound waves reach it oe
B1 ossicles: three tiny bones that amplify the vibrations and pass them on to the inner ear oe
B1 cochlea: fluid-filled, coiled structure that converts vibrations into electrical signals (nerve impulses) sent to the brain oe
Answer: The pinna collects sound waves into the ear canal; the eardrum vibrates when sound reaches it; the ossicles amplify these vibrations and pass them to the inner ear; the cochlea converts the vibrations into electrical signals sent to the brain.

Question 26

B1 exothermic: a reaction that releases (transfers) energy to the surroundings, causing a temperature rise, e.g. combustion (burning fuel) oe
B1 endothermic: a reaction that takes in energy from the surroundings, causing a temperature fall, e.g. thermal decomposition, or some substances dissolving oe
B1 everyday use of an exothermic reaction: e.g. burning fuel to heat a home, or a self-heating can/hand warmer oe
Answer: An exothermic reaction releases energy to the surroundings, raising the temperature, for example burning fuel. An endothermic reaction takes in energy from the surroundings, lowering the temperature, for example some thermal decomposition reactions. An everyday use of an exothermic reaction is burning fuel to heat a home.

Question 27

(a) B1 he changes the thickness of card at the same time as changing the magnet, so more than one variable changes between tests oe
(a) Answer: He changes the card thickness at the same time as changing the magnet, so two variables change between tests instead of just one.
(b) B1 use the same thickness of card for every magnet tested, only changing the magnet oe
(b) Answer: Use the same thickness of card for testing every magnet, changing only the magnet itself.
(c) B1 fewer paperclips would be picked up, because a magnetic field gets weaker with distance from the magnet, so a thicker card places the paperclips further away in a weaker part of the field oe
(c) Answer: Fewer paperclips would be picked up, because the magnetic field gets weaker further from the magnet, and a thicker card places the paperclips further away, in a weaker part of the field.
(d) B1 repeat each test several times (e.g. three times) with each magnet and calculate a mean number of paperclips picked up oe
(d) Answer: Repeat each test several times with each magnet and calculate a mean number of paperclips picked up.

Question 28

B1 a thick layer of blubber (fat) under the skin, providing insulation and reducing heat loss oe
B1 thick fur, including an insulating underfur layer, which traps air for extra insulation oe
B1 a compact body shape with small, rounded ears, reducing its surface area to volume ratio and so reducing heat loss oe
B1 large, wide paws that spread its weight, stopping it sinking into snow (and helping it swim) oe
Answer: A polar bear has a thick layer of blubber for insulation, thick fur (including an insulating underfur) that traps air, a compact body shape with small ears that reduces heat loss, and large, wide paws that spread its weight on snow and help it swim.

Question 29

(a) B1 2.7 g/cm3 cao
(a) Answer: 2.7 g/cm3
(b) B1 Block M cao
(b) Answer: Block M.
(c) B1 yes; the calculated density of Block J (2.7 g/cm3) matches the density of aluminium almost exactly, supporting the suggestion oe
(c) Answer: Yes; the calculated density of Block J is 2.7 g/cm3, which matches the density of aluminium almost exactly, supporting the suggestion.
(d) B1 density depends on both mass and volume (mass divided by volume), not on mass alone; comparing mass alone would be wrong if the blocks had different volumes oe
(d) Answer: Density depends on both mass and volume, not mass alone; the reasoning would be wrong for blocks with different volumes, and only happens to give the right answer here because Blocks K and L both have the same volume (10 cm3).

Question 30

(a) B1 the duration of exercise (2 minutes) for every activity oe
(a) B1 any other valid control, e.g. resting until pulse rate was steady before starting, or using the same pupil for all three activities oe
(a) Answer: The duration of exercise (2 minutes each time) and resting until pulse rate was steady before each activity (or using the same pupil for all three activities).
(b) B1 star jumps cao
(b) Answer: Star jumps.
(c) B1 star jumps use more/larger muscle groups working more vigorously than walking or jogging oe
(c) B1 these muscles need more oxygen (and glucose) for respiration to release energy, so the heart beats faster to pump oxygenated blood to them more quickly oe
(c) Answer: Star jumps work more, larger muscle groups more vigorously than walking or jogging, so those muscles need more oxygen for respiration to release energy; the heart beats faster to pump oxygenated blood to the muscles more quickly, increasing pulse rate the most.
(d) B1 repeat each activity several times (e.g. with different pupils, or on different days) and calculate a mean increase in pulse rate for each activity oe
(d) Answer: Repeat each activity several times, for example with more pupils or on different days, and calculate a mean increase in pulse rate for each activity.

Science: Full Practice Paper 3 - Worksheets, Questions and Revision

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CE.S-T3 Science: Full Practice Paper 3

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