Year 10 Science

1. 1.Why does a herbivore have a longer small intestine than a carnivore of the same size?

   • a) A longer intestine absorbs more water
   • b) Cellulose from grass takes longer to digest than meat does
   • c) Plants contain more protein than meat does
   • d) Herbivores eat less often

2. 2.Put the parts of the alimentary canal in the order food passes through them, starting with "Mouth".

   • Small intestine
   • Stomach
   • Large intestine
   • Anus
   • Mouth
   • Oesophagus

3. 3.Match each stage in the break-down of glucose to what it produces.

   • The first step, taken in the cytoplasm
   • Fermentation in yeast
   • Break-down of pyruvate in the mitochondria
   • A muscle cell short of oxygen

   • Carbon dioxide and water
   • Lactic acid
   • Ethanol and carbon dioxide
   • Pyruvate

4. 4.Which pair of statements matches the two conducting tissues of a plant?

   • a) Xylem carries water and minerals up; phloem carries the products of photosynthesis both ways
   • b) Xylem carries sugar down; phloem carries water up
   • c) Xylem carries water and sugar; phloem carries minerals
   • d) Both carry water, xylem by day and phloem by night

5. 5.A stoma on the underside of a leaf is drawn below: two curved guard cells with a gap between them. Tap the pore that gases pass through.

   Write the number of the part.

6. 6.Oxygen and carbon dioxide are carried round the body in different ways. Which description is right?

   • a) Oxygen is dissolved in the plasma; carbon dioxide is carried by haemoglobin
   • b) Both are mostly dissolved in the plasma
   • c) Oxygen is carried by haemoglobin in the red corpuscles; carbon dioxide is mostly dissolved in the plasma
   • d) Both are carried by haemoglobin in the red corpuscles

7. 7.A fish opens and closes its mouth far more often in a minute than you breathe. Why?

   • a) A fish needs more oxygen than a human being does
   • b) There is much less oxygen dissolved in water than there is in air
   • c) A fish has smaller lungs than a human being
   • d) Water is heavier than air and moves more slowly

8. 8.Blood goes round and round, so pick a place to begin: starting from "The right atrium", put the stages of one full circuit in order.

   • The rest of the body
   • The lungs
   • The right atrium
   • The left ventricle
   • The right ventricle
   • The left atrium

Life processes · Year 10 Science · www.arenapublications.com/learn

1. 1.Sort each directional growth by the stimulus it answers to.

   Groups: Phototropism · Geotropism · Chemotropism

   • A pollen tube growing towards an ovule
   • A shoot bending towards a window
   • A root turning downwards into the soil

2. 2.Sort each job by the part of the brain the chapter gives it to.

   Groups: Fore-brain · Cerebellum · Medulla

   • Salivation and vomiting
   • Thinking about what the senses report
   • Riding a bicycle in a straight line

3. 3.Match each hormone to the gland that makes it.

   • Growth hormone
   • Thyroxin
   • Insulin
   • Adrenaline
   • Oestrogen
   • Testosterone

   • Thyroid gland
   • Pancreas
   • Adrenal gland
   • Ovaries
   • Testes
   • Pituitary gland

4. 4.Why is iodised salt worth using?

   • a) The pituitary needs iodine to make growth hormone
   • b) The thyroid gland needs iodine to make thyroxin
   • c) Iodine replaces the salt lost in sweat
   • d) Iodine is the hormone that regulates blood sugar

5. 5.Adrenaline is released when an animal is frightened. Which set of changes follows?

   • a) The heart beats faster, blood is diverted to the skeletal muscles, and breathing quickens
   • b) The heart slows, blood goes to the digestive system, and breathing quietens
   • c) The heart beats faster and blood is diverted to the skin and gut
   • d) Breathing quickens and the skeletal muscles are cut off from blood

6. 6.A shoot bends towards a window. Where has the auxin gone, and what has it done?

   • a) To the lit side, where it has made the cells grow longer
   • b) To the shady side, where it has stopped the cells growing
   • c) To the shady side, where it has made the cells grow longer
   • d) To the root, where it has made the root bend too

7. 7.A pea plant's tendril meets a stick and curls round it. What makes it curl?

   • a) The tendril's muscles contract on the side touching the stick
   • b) The side touching the stick grows less rapidly than the side away from it
   • c) The stick releases a hormone that pulls the tendril round
   • d) The tendril loses water on the side away from the stick

8. 8.Put the stages of an impulse travelling along one neuron in order, starting with "The dendritic tip picks the information up".

   • A chemical reaction there creates an electrical impulse
   • Chemicals released at the end cross the synapse
   • The impulse runs along the axon to its end
   • The impulse travels to the cell body
   • The dendritic tip picks the information up

Control and coordination · Year 10 Science · www.arenapublications.com/learn

1. 1.A population of bacteria lives in temperate water, and the water warms. Most die; a few carrying a heat-resistant variation live and multiply. What does this show?

   • a) Warm water causes bacteria to develop resistance
   • b) Variation gives a species a chance of surviving a change in its niche
   • c) Asexual reproduction produces identical offspring
   • d) Variation protects each individual from any change

2. 2.Banana, orange, rose and jasmine are raised by vegetative propagation. What makes it the method of choice for them?

   • a) They have lost the capacity to produce seeds
   • b) Their seeds produce plants that flower too early
   • c) Their flowers cannot be pollinated by insects
   • d) Their seeds take too long to germinate

3. 3.Put the stages of fertilisation in a flowering plant in order, starting with "Pollen lands on a suitable stigma".

   • The ovule takes a tough coat and becomes a seed
   • A tube grows out of the pollen grain and travels down the style
   • The male germ-cell fuses with the egg cell in the ovule
   • The ovary ripens into a fruit
   • The zygote divides again and again to form an embryo
   • Pollen lands on a suitable stigma

4. 4.Why does bread mould make spores with thick walls round them?

   • a) The wall stops the spore from dividing too early
   • b) The wall makes the spore heavy enough to fall to the ground
   • c) The wall holds the food store the new individual grows on
   • d) The wall protects the spore until it meets a moist surface and can grow

5. 5.Which of these is a viral infection that can be passed on during the sexual act, according to the chapter?

   • a) Goitre
   • b) Gonorrhoea
   • c) Syphilis
   • d) HIV-AIDS

6. 6.Put these stages in order, starting with "One of the ovaries releases an egg".

   • The egg travels along the oviduct
   • One of the ovaries releases an egg
   • The embryo is implanted in the lining of the uterus
   • The zygote divides into a ball of cells
   • A sperm meets the egg in the oviduct

7. 7.Match each part to the job it does.

   • The testes
   • The vas deferens
   • The ovaries
   • The oviduct
   • The placenta

   • Make the sperms
   • Passes glucose and oxygen from the mother to the embryo
   • Carries the sperms from the testes
   • Make the eggs
   • Carries the egg towards the uterus

8. 8.What does the placenta's structure — villi on the embryo's side, blood spaces on the mother's — give the embryo?

   • a) A barrier that keeps the mother's blood entirely separate
   • b) A store of food the embryo draws on directly
   • c) A large surface for glucose and oxygen to pass across, and for wastes to pass back
   • d) A muscular wall that pushes nutrients through

How organisms reproduce · Year 10 Science · www.arenapublications.com/learn

1. 1.Which parent's contribution decides whether a human child is a boy or a girl?

   • a) Both equally, since each contributes one sex chromosome
   • b) The father's, because the mother contributes an X either way
   • c) The mother's, because she carries two X chromosomes
   • d) Neither — the temperature of development decides it

2. 2.How does a gene end up controlling how tall a plant grows?

   • a) It counts the number of cells the stem may have
   • b) It sets how efficient an enzyme is, which sets how much growth hormone is made
   • c) It decides how much water the roots take up
   • d) It stretches the cells of the stem directly

3. 3.Crossing a tall pea with a short one gave no plants of medium height. What did that tell Mendel?

   • a) Height is not an inherited trait in peas
   • b) The short parent had contributed nothing to the offspring
   • c) One parental trait was showing, rather than a mixture of the two
   • d) The two plants belonged to different species

4. 4.Four second-generation pea plants are drawn to scale below. Tap the one that must have inherited two copies of the recessive factor.

   Write the number of the part.

5. 5.A trait that shows itself in a pea plant when both copies of the factor are of that kind, and not otherwise — what is such a trait called? Answer with one word.

6. 6.Sort each of Mendel's pea traits as the chapter classifies it.

   Groups: Dominant · Recessive

   • Tall plants
   • Short plants
   • Round seeds
   • Wrinkled seeds

7. 7.In some reptiles, what decides whether the animals developing in the eggs will be male or female?

   • a) The sex chromosomes inherited from the father
   • b) The order in which the eggs were laid
   • c) The temperature at which the fertilised eggs are kept
   • d) The size of the egg

8. 8.What was new about Mendel's way of working, compared with others who had bred peas before him?

   • a) He was the first to cross two different pea plants
   • b) He kept count of the individuals showing each trait in each generation
   • c) He used a microscope to look at the germ-cells
   • d) He was the first to grow peas in a monastery garden

Heredity · Year 10 Science · www.arenapublications.com/learn

1. 1.Sort each reaction by the kind of reaction it is.

   Groups: Combination · Decomposition · Displacement · Double displacement

   • Carbon burning in oxygen to give carbon dioxide
   • An iron nail left in copper sulphate solution
   • Ferrous sulphate crystals heated in a boiling tube
   • Limestone heated in a kiln
   • Sodium sulphate solution mixed with barium chloride solution
   • Calcium oxide and water make slaked lime

2. 2.Hydrogen is passed over heated copper(II) oxide: CuO + H₂ → Cu + H₂O. Which substance has been reduced?

   • a) Hydrogen
   • b) Copper
   • c) Water
   • d) Copper(II) oxide

3. 3.Limestone is heated strongly in a kiln and gives quick lime and carbon dioxide. What kind of reaction is that?

   • a) Thermal decomposition
   • b) A displacement reaction
   • c) A combination reaction
   • d) A precipitation reaction

4. 4.Sort each of these by whether energy comes out of the reaction or goes into it.

   Groups: Heat given out · Energy taken in

   • Green crystals heated until they give off a sharp smell
   • Respiration in our cells
   • Silver chloride left in sunlight
   • Natural gas burning
   • Water split by an electric current
   • Quick lime added to water

5. 5.Bags of crisps are flushed with nitrogen before they are sealed. What is that for?

   • a) It keeps the fat in them from being oxidised
   • b) It stops the bag from being crushed
   • c) It cools the crisps down
   • d) It keeps the crisps dry

6. 6.Match each everyday sight to what it is called.

   • An iron gate turning reddish brown
   • A silver spoon going black
   • Butter left out until it smells off
   • A white solid appearing as two clear solutions meet

   • Corrosion
   • Precipitation
   • Rusting
   • Rancidity

7. 7.Zinc granules are dropped into dilute sulphuric acid. Bubbles rise round them and the tube grows warm. Which two of the chapter's signs of a reaction is that?

   • a) The colour changes, and a gas is given off
   • b) A gas is given off, and the temperature changes
   • c) The temperature changes, and the colour changes
   • d) The state changes, and the colour changes

8. 8.Butter kept too long smells and tastes different, because the fat in it has been oxidised. What is this change called? Answer with one word.

Chemical reactions and equations · Year 10 Science · www.arenapublications.com/learn

1. 1.Which of these did the litmus tests find to be basic?

   • a) Baking soda solution
   • b) Amla juice
   • c) Sugar solution
   • d) Vinegar

2. 2.Red rose extract has been added to each of these three test tubes. Tap the tube holding a basic solution.

   Write the number of the part.

3. 3.Each of these was tested with blue and red litmus paper. Sort them by the nature the papers reported.

   Groups: Acidic · Basic · Neutral

   • Vinegar
   • Tamarind water
   • Soap solution
   • Lemon juice
   • Lime water
   • Sugar solution
   • Washing powder solution
   • Salt solution

4. 4.A substance that shows one colour in an acid and a different colour in a base has a two-word name in this chapter. What is it?

5. 5.An acid solution and a base solution are mixed in the right amounts and the result is neither acidic nor basic. What is this reaction called?

6. 6.A red ant bites, and moist baking soda rubbed on the spot relieves the stinging. Why does that work?

   • a) Baking soda is an acid and washes the sting away
   • b) Baking soda is a base and neutralises the acid the ant injected
   • c) Baking soda turns the acid into a stronger acid that numbs the skin
   • d) Baking soda dries the skin so the sting cannot spread

7. 7.Put the steps of making a red rose indicator back into the order the chapter gives them.

   • Crush the petals with a mortar and pestle
   • Filter off the coloured liquid and keep it as the extract
   • Pour hot water over the crushed petals and cover the tumbler
   • Wash the fallen rose petals in water

8. 8.Match each problem to the treatment the chapter gives for it.

   • Soil that is too acidic
   • Soil that is basic
   • Acidic factory waste

   • treated with a basic substance before release
   • treated with lime
   • treated with manure and composted leaves

Acidic, basic and neutral substances · Year 10 Science · www.arenapublications.com/learn

1. 1.Concentrated sulphuric acid has to be mixed with water. Why is the acid poured into the water rather than the water into the acid?

   • a) Water poured onto acid makes a poisonous gas
   • b) Mixing gives out a lot of heat, and water poured onto acid can splash the mixture out
   • c) The acid would stop working if water were poured onto it
   • d) The acid would freeze the water

2. 2.Bleaching powder is made from chlorine and one other substance. Which?

   • a) Plaster of Paris
   • b) Dry slaked lime
   • c) Common salt
   • d) Washing soda

3. 3.A gas is bubbled through lime water and the lime water turns milky. Which gas is it?

   • a) Hydrogen
   • b) Oxygen
   • c) Water vapour
   • d) Carbon dioxide

4. 4.Solution P has a pH of 6 and solution Q has a pH of 8. Which statement is right?

   • a) They hold the same number of hydrogen ions
   • b) Q has more hydrogen ions, and Q is the acidic one
   • c) P has more hydrogen ions, and Q is the acidic one
   • d) P has more hydrogen ions, and P is the acidic one

5. 5.Zinc granules are dropped into dilute sulphuric acid and bubbles rise from them. A burning candle held to a bubble makes it pop. Which gas is it?

   • a) Chlorine
   • b) Hydrogen
   • c) Carbon dioxide
   • d) Oxygen

6. 6.Sodium hydroxide is a base, and it dissolves in water. What is the one-word name for a base that dissolves in water?

7. 7.A strip of pH paper scale is drawn below, running from 0 at the left to 14 at the right. Tap the stretch a basic solution would read in.

   Write the number of the part.

8. 8.The pH scale is drawn out below. Where does a neutral solution sit?

   Mark the line with an X.

Acids, bases and salts · Year 10 Science · www.arenapublications.com/learn

1. 1.Which pair of statements about ionic compounds matches what the chapter reports?

   • a) They melt at high temperatures and dissolve in water rather than in kerosene
   • b) They melt at high temperatures and dissolve in kerosene rather than in water
   • c) They melt at low temperatures and dissolve in water rather than in kerosene
   • d) They melt at low temperatures and dissolve in kerosene rather than in water

2. 2.A cell for refining copper is drawn below, with the two plates hanging in the solution and the battery marked. Tap the plate the pure copper builds up on.

   Write the number of the part.

3. 3.Aluminium oxide reacts with acids and with bases alike, giving a salt and water either way. What one word describes an oxide that does this?

4. 4.A metal does not react with cold water or hot water, but does react with steam to give an oxide and hydrogen. Which of these behaves that way?

   • a) Iron
   • b) Gold
   • c) Potassium
   • d) Calcium

5. 5.A block of common salt does not conduct electricity, but the same salt melted or dissolved does. Why?

   • a) Water adds ions of its own to the solid
   • b) The solid has no ions until it is melted
   • c) The ions can move once the rigid solid structure is broken up
   • d) Melting turns the ions into electrons

6. 6.Sort each metal by how the chapter says it is won from the earth.

   Groups: Found in the native state · Reduction using carbon · Electrolysis of the molten compound

   • Silver
   • Iron
   • Gold
   • Aluminium
   • Zinc
   • Sodium

7. 7.Galvanised iron sheets are coated with a thin layer of which metal?

   • a) Aluminium
   • b) Tin
   • c) Chromium
   • d) Zinc

8. 8.Match each description to the term the chapter gives it.

   • A mineral rich enough to extract the metal from at a profit
   • The soil and sand that come up with the ore
   • Heating a sulphide ore strongly in plenty of air
   • Heating a carbonate ore strongly in limited air
   • The insoluble leavings that settle under the anode

   • Gangue
   • Calcination
   • Roasting
   • Ore
   • Anode mud

Metals, non-metals and the reactivity series · Year 10 Science · www.arenapublications.com/learn

1. 1.Sort each compound by whether it carries a double or triple bond between carbon atoms.

   Groups: Saturated · Unsaturated

   • Methane
   • Ethyne
   • Ethane
   • Propene
   • Cyclohexane
   • Ethene

2. 2.Methane and chlorine are left together in sunlight, and one hydrogen of the methane is replaced by a chlorine atom. What kind of reaction is this?

   • a) An esterification reaction
   • b) An oxidation reaction
   • c) An addition reaction
   • d) A substitution reaction

3. 3.Soap makes very little foam in water from a hand-pump, and leaves a curdy solid behind. Why?

   • a) It reacts with the calcium and magnesium salts that make the water hard
   • b) Hard water already holds detergent
   • c) The water is too cold for the soap to dissolve
   • d) The soap has been oxidised by the air

4. 4.Match each ending used in a compound's name to the class of compound it marks.

   • Suffix -ol
   • Suffix -al
   • Suffix -one
   • Suffix -oic acid
   • Suffix -yne

   • Alcohol
   • Ketone
   • Alkyne
   • Carboxylic acid
   • Aldehyde

5. 5.A gas stove burns with a yellow flame and blackens the bottom of the pan. What has gone wrong?

   • a) The pan is too close to the flame
   • b) The gas is being fed in too slowly
   • c) The air holes are blocked, so the fuel is burning incompletely
   • d) The fuel is unsaturated and cannot burn cleanly

6. 6.Why does carbon share electrons instead of gaining or losing four of them?

   • a) Carbon atoms are too large to hold a charge
   • b) Carbon has no electrons in its outermost shell to give away
   • c) Six protons could neither hold ten electrons nor be stripped of four without great cost
   • d) Carbon already has a full outermost shell

7. 7.An unsaturated hydrocarbon is warmed with hydrogen over a palladium catalyst. What comes out?

   • a) A haloalkane
   • b) A saturated hydrocarbon
   • c) An ester
   • d) A carboxylic acid

8. 8.How many different carbon skeletons can be drawn for the formula C₄H₁₀?

   • a) Four
   • b) One
   • c) Three
   • d) Two

Carbon and its compounds · Year 10 Science · www.arenapublications.com/learn

1. 1.A train travels at a speed of 90 kilometres per hour. How many hours does it take to cover 360 kilometres? Answer with a number.

2. 2.A bus moves at a speed of 50 kilometres per hour for 2 hours. How far does it go, in kilometres? Answer with a number.

3. 3.A cyclist covers 240 metres in 30 seconds. What is the cyclist's speed in metres per second? Answer with a number.

4. 4.Three sprinters are part-way through a race on a straight track and one of them is ahead of the others. What does that tell you?

   • a) Nothing until the race is over
   • b) She has covered more distance in the same time, so she is the faster
   • c) She has a longer stride, which is a different thing from speed
   • d) She started before the others did

5. 5.A car's journey is 60 kilometres and it takes 1 hour, so its speed works out at 60 kilometres per hour. But it stopped twice at signals. What does the chapter call the 60?

   • a) Its highest speed
   • b) Its average speed
   • c) Its uniform speed
   • d) Its lowest speed

6. 6.Sort each stretch of a train's journey along a straight track.

   Groups: Uniform linear motion · Non-uniform linear motion

   • A train covering the same distance in each ten-minute interval
   • A train slowing down as it comes into a station
   • A train pulling out of a station and picking up speed
   • A train running at an unchanging speed along a straight stretch
   • A train covering different distances in successive ten-minute intervals

7. 7.A train covers 300 kilometres in 4 hours. What is its speed in kilometres per hour? Answer with a number.

8. 8.The chapter calls uniform linear motion an idealisation. Why?

   • a) It applies to trains but to nothing else
   • b) Objects are seldom found holding a constant speed for long, which is why average speeds are used
   • c) Straight tracks do not exist in practice
   • d) Speed cannot be measured accurately enough to check it

Speed and motion · Year 10 Science · www.arenapublications.com/learn

1. 1.A lorry is doing 72 km/h. What is that in m/s? Answer with a number.

2. 2.A cyclist covers 300 m of path in 60 s. What is her average speed, in m/s? Answer with a number.

3. 3.A bus covers 15 m in the first second, 15 m in the second and 15 m in the third. What does the chapter call this motion?

   • a) Non-uniform motion in a straight line
   • b) Uniform circular motion
   • c) Uniform motion in a straight line
   • d) Motion with constant acceleration

4. 4.A child on a merry-go-round rides exactly once round the circle and stops where she got on. What is the magnitude of her displacement, in metres? Answer with a number.

5. 5.A cyclist rides round a circular track at a steady 8 m/s. What is happening to her velocity?

   • a) Both its direction and its magnitude stay fixed
   • b) Its direction keeps changing while its magnitude stays fixed
   • c) It falls to zero each time she completes a lap
   • d) Its magnitude keeps changing while its direction stays fixed

6. 6.An athlete runs along the track from O out to A, then turns and comes back as far as B. Tap the bar whose length is the magnitude of her displacement.

   Write the number of the part.

7. 7.A stone is dropped from a height. Put its speeds in order, starting from 0 m/s, at the instant it is released.

   • 29.4 m/s, after three seconds
   • 9.8 m/s, one second later
   • 0 m/s, at the instant it is released
   • 19.6 m/s, after two seconds

8. 8.How does the magnitude of an object's displacement compare with the total distance it travelled over the same interval?

   • a) It is greater than the distance travelled
   • b) It is zero as soon as the object has moved
   • c) It is less than or equal to the distance travelled
   • d) The two are the same in each case

Distance, displacement, speed and velocity · Year 10 Science · www.arenapublications.com/learn

1. 1.When may the three kinematic equations be used?

   • a) When the velocity stays constant through the motion
   • b) When the object is at rest
   • c) When the acceleration stays constant through the motion
   • d) For any motion whatsoever

2. 2.A car is doing 12 m/s when the driver brakes at a steady −3 m/s² until it stops. Use v² = u² + 2as. How far does it travel while braking, in metres? Answer with a number.

3. 3.A cart starts from rest and accelerates steadily at 2 m/s² for 5 s. Use s = ut + ½at². How far does it travel, in metres? Answer with a number.

4. 4.A child looks at a position-time graph whose line climbs steadily and says the object must have travelled uphill. What has she misread?

   • a) The graph is not a route map — its rise shows position changing with time
   • b) A rising line means the object was slowing down
   • c) Nothing; a rising line does mean the object went uphill
   • d) The graph shows velocity up the side, not position

5. 5.Two objects, A and B, are drawn on one position-time graph. B's line is steeper than A's. What follows?

   • a) A has the greater magnitude of average velocity
   • b) B has the greater magnitude of average velocity
   • c) The two have the same average velocity
   • d) B started further from the origin than A

6. 6.A trolley is doing 5 m/s and accelerates steadily at 3 m/s² for 4 s. Use v = u + at. What is its final velocity, in m/s? Answer with a number.

7. 7.Three position-time graphs are sketched below. Tap the one that shows an object at rest.

   Write the number of the part.

8. 8.On a position-time graph an object is at 30 m at 2 s and at 105 m at 5 s. What is the magnitude of its average velocity, in m/s? Answer with a number.

Motion graphs and the kinematic equations · Year 10 Science · www.arenapublications.com/learn

1. 1.A 1500 kg car accelerates at 2 m/s². What net force is acting on it, in N? Answer with a number.

2. 2.A 0.1 kg bullet has a force of 2 N on it. What is its acceleration, in m/s²? Answer with a number.

3. 3.Sort each situation by whether the forces acting are balanced.

   Groups: Balanced forces · Unbalanced forces

   • A stalled car set moving by two people pushing
   • A rope moving towards the team that pulls harder
   • A book lying still on a table
   • A tug of war in which both teams pull equally hard

4. 4.Which pair of forces is a Newton's-third-law pair?

   • a) The weight of a book and the table's upward push on that same book
   • b) The foot pushing the ground backwards and the ground pushing the foot forwards
   • c) The forward pull of two people pushing one stalled car
   • d) The push of a hand on a box and the friction on that same box

5. 5.A net force of 12 N acts on a 3 kg trolley. What is its acceleration, in m/s²? Answer with a number.

6. 6.Match each of Newton's laws to what it claims.

   • Newton's first law
   • Newton's second law
   • Newton's third law

   • The acceleration is the net force divided by the mass
   • An object keeps its rest or its constant velocity until a net force acts
   • A force on one object is met by an equal and opposite force on the other

7. 7.A block has 14 N acting on it to the right and 6 N to the left. What is the magnitude of the net force, in N? Answer with a number.

8. 8.Two boxes joined by a string are pulled to the right by one force. Tap the place where the force acting is internal to the system, and so drops out when the two boxes are treated as one object.

   Write the number of the part.

Force and Newton's three laws · Year 10 Science · www.arenapublications.com/learn

1. 1.Which statement is Ohm's law as the chapter states it?

   • a) The potential difference across a metallic wire is proportional to its length
   • b) The current through a metallic wire is proportional to its resistance
   • c) The potential difference across a metallic wire is proportional to the current through it, at constant temperature
   • d) The resistance of a metallic wire is proportional to the current through it

2. 2.A wire is replaced by another of the same material and thickness but twice the length. What happens to its resistance?

   • a) It falls to a quarter
   • b) It halves
   • c) It stays the same
   • d) It doubles

3. 3.Why can an electric bulb and an electric heater not sensibly be wired in series?

   • a) The current is the same throughout a series circuit, and the two need very different currents
   • b) The heater would short out the bulb
   • c) A series circuit cannot carry enough voltage for two devices
   • d) The bulb would take the whole of the current and leave none for the heater

4. 4.A circuit is drawn below: a cell on the left, a resistor along the top, and two round instruments wired into it. Tap the one that is connected across the resistor rather than in the loop with it.

   Write the number of the part.

5. 5.What does a fuse do, and where is it placed?

   • a) Its wire melts under an unduly high current, breaking a circuit it sits in parallel with
   • b) Its wire melts under an unduly high current, breaking a circuit it sits in series with
   • c) It lowers the resistance of the circuit so less current flows
   • d) It stores charge until the current returns to normal

6. 6.A 6 Ω resistor and a 3 Ω resistor are joined in parallel. What is the equivalent resistance, in ohms? Answer with a number.

7. 7.Resistors of 5 Ω, 8 Ω and 12 Ω are joined in series. What is the equivalent resistance, in ohms? Answer with a number.

8. 8.Match each electrical quantity to its SI unit.

   • Electric current
   • Potential difference
   • Resistance
   • Electric power
   • Electrical energy sold commercially

   • Watt
   • Volt
   • Ampere
   • Ohm
   • Kilowatt hour

Electricity · Year 10 Science · www.arenapublications.com/learn