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Primary 4 Science Mock Examinations

First Edition 2018

© Singapore Asia Publishers Pte Ltd

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MOCK EXAMINATION 1BOOKLET A1 (4) 2 (1) 3 (3) 4 (4) 5 (2)6 (3) 7 (4) 8 (3) 9 (1) 10 (4)11 (3) 12 (1) 13 (4) 14 (2) 15 (4)16 (1) 17 (3) 18 (4) 19 (3) 20 (1)21 (1) 22 (2) 23 (1) 24 (1) 25 (2)26 (1) 27 (3) 28 (2)

BOOKLET B1 When some of the eggs are eaten by predators, there will

still be other remaining eggs that will hatch to become frogs.

2 (a) The eggs were not fertilised so they would not hatch to become chicks.

(b) (i) and (ii)

egg yolk

3 (a) egg

pupa

larva (wriggler)adult

mosquito

(b) The egg, larva and pupa stages. They are found in stagnant water and so pouring the

water away or spraying insecticide on the water will kill them easily.

4 (a) She added too much water and the green beans started to decompose./The green beans she added were cooked and so they did not grow.

(b) She must provide uncooked beans with a continuous supply of water, oxygen and warmth.

5 (a) Steel. It is a good conductor of heat and food will be cooked fast.

(b) Plastic (Bakelite). It is a poor conductor of heat and so it will not be too hot for the person holding the pan.

6 Paper is a poor conductor of heat compared to metal so a box made of paper will keep the food warm for a longer period of time compared to one made of metal.

7 (a) Matter Non-matter

oxygenhoney

ice

heatshadowmusic

(b) (i) Matter occupies space. (ii) Matter has mass.

8 (a) Both animals start their life cycles by laying eggs. (b) The grasshopper has a 3-stage life cycle but the silk

moth has a 4-stage life cycle. (c) At pupa stage (d) Cockroach/Dragonfly

9 (a) At stage A. Sunlight is needed so that the true leaves can trap sunlight to make food for the plant.

(b) Seed leaf (c) (i) water (ii) warmth (Accept ‘oxygen’ as a possible answer.)

(d) No, it will not grow. For a seed to germinate, it needs water, oxygen and warmth. Since there is a lack of oxygen, the seed will not germinate.

10 (a) Plant A. The roots of plant A had grown deeper into the ground and this would allow it to absorb more water from the ground.

(b) Plant A. The roots had grown deeper into the ground andsotheywouldbeabletoholdtheplantfirmlytothe ground.

(c) Roots can store food for the plant.

11 (a) A: Respiratory system B: Digestive system C: Skeletal system D: Muscular system (b) System B. / Digestive system (c) System D. / Muscular system (d) System C. / Skeletal system

12 (a) No. The distance between the two different magnets and iron pins in each set-up is different.

(b) The button magnet had a stronger magnetic force. It was further away from the iron pins but was able to attract the same number of iron pins as the bar magnet.

(c) No silver pins would be attracted to any magnet. Silver pins are not magnetic materials, so they will not be attracted to the magnets.

13 (a) Themetalrodfirstgainedheatfromthehotwater.Then the wax gained heat from the metal rod and melted.

(b) It showed that heat travelled from a hotter body to a colder body. It also showed that the rod which was made of metal was a good conductor of heat. It gained heat from the hot water and the wax which was on the metal rod melted when it was at a higher temperature.

(c) (i) The time taken for the wax to melt would be longer.

(ii) Wood is a poor conductor of heat. It would gain heat slower than the metal rod. Thus, the time taken for the heat to travel to melt the wax would be longer.


BOOKLET B1 (a) North (b) (i) like (ii) attracted

2 (a) Shadows are formed when light is blocked by a translucent or an opaque object.

(b)

Answers to Primary 4 Science Mock Examinations© Singapore Asia Publishers Pte LtdALL RIGHTS RESERVED. Mock Examination 1 / Mock Examination 2

A1

(c) A clear plastic beach ball is made of a transparent material. When light shines on it, it passes through the material. Since no light is blocked, no shadow is formed.

3 (a) Steel is a good conductor of heat. Water in the metal kettle will be able to boil easily.

(b) Plastic is a poor conductor of heat. It will be easier for us to hold the kettle and remove it from the stove when the water boils.

4 (a) X: windpipe Y: lung (b) Respiratory system (c) Ribcage

5 (a) (i) False (ii) True (b) (i) The air in the cup could not escape, hence

when the cup was pushed down into the basin of water, the air pushed it upwards.

(ii)

(c) Bubbles would be seen escaping from the cup to the water surface.

6 (a) Solid state (b) Asolidhasadefiniteshape. (c) Air has mass and when 100 cm3 of air was added to

balloon B, its mass increased as balloon B expanded in size due to its elasticity. It became heavier and so the pole tilted towards balloon B.

7 (a) Thestopperwouldpopoutfromtheemptyflask. Air in the flask expanded when heated. The

expanded air needed more space and so the stopper waspushedoutoftheflask.

(b) No, the result would not be the same. Ifheplacedtheemptyflaskinabasinoficecubes,

the air inside it would lose heat to the ice cubes and occupylessspaceintheemptyflask.

8 (a) He would feel that the tap water had become warmer. (b) The tap water gained heat from the hot milk and so

its temperature increased. (c)

lose heat

gain heat

(d) (Any temperature in the range of 30°C to 50°C.)

9 (a) C

A

B

(b) LightfallingoncarYisreflectedtothemirror.ThemirrorreflectstheimageofcarYintotheeyesofthe driver of car X.

(c) Material C. It allowed the least amount of light passing through it and so it will be the best material for making blackout curtains.

10 (a) The dried leaves would start to burn. (b) The dried leaves would gain heat from the light

shining through the magnifying glass and eventually, the dried leaves would become too hot and they wouldcatchfire.

(c) No. The pile of green leaves would not burn. (d)

11 (a) The magnetic strips in the stopper attract the steel plate and hold the door against the wall.

(b) The magnetism from the magnet passed through the paper (a non-magnetic material) and attracted the magnet to the metal board (a magnetic material).

(c) Magnetism could not attract non-magnetic materials. Thus the wooden board which is a non-magnetic material could not attract the magnet.

12 (a) Box Y. Fungus is a living thing, which requires warmth and moisture in order to grow well. Box Y contained water and was placed in a warm place. The conditions are favourable for fungus to grow easily.

(b) Her feet need to be kept dry to reduce the growth of fungi on them. Wearing sandals would help keep her feet dry and she would recover faster.


BOOKLET B1 (a) Roots (b) Part C (c) Part A helps the plant to trap sunlight so it can make

food for the plant.

2 (a) Steel / nickel / cobalt / iron (Any 2) (b) Object P was a magnetic material that was able to

attract the bar magnet. / Object P is a magnet that can attract the bar magnet.

(c) Drop the magnet on the ground several times. / Hit itwithahammerseveraltimes./Heatoveraflameoffire.(Any 2.)

3 (a)

set-up 1Number of batteries

Number of paperclips attracted to the electromagnet

set-up 2

(b) No paperclips would be attracted to the copper nail as copper is not a magnetic material.


A2

(c) When there were more batteries connected in the circuit, more paperclips would be attracted to the electromagnet.

4 (a) The cover contracted more than the box in the freezer and it became smaller than the box.

(b) No. The living room would have a constant room temperature and this would not cause any of the objects to contract.

5 (a) Heistryingtofindoutiflightcanpassthroughthedifferent substances by looking at their shadows.

(b) Different types of materials produce different types of shadows when light is blocked. A transparent material does not produce any shadow.

(c) Set-up 1: plastic Set-up 2: metal Set-up 3: glass

6 (a) (i) Both objects B and C do not give off light. (ii) Object A gives off light but not object C. (b) No, the moon does not give off light on its own. It

reflectslightfromtheSun.

7 (a) Aliquidhasadefinitevolumeandwillneedtooccupyafixedamountofspace.

(b) Waterhasnodefinite shapebutmarbleshaveadefiniteshape.

8 (a) 100 cm3

(b) The water level would be the same. The shape of the plasticine may change but the volume of the plasticine remained the same.

(c)

metal cube 150 cm3

100200300400500600

9 (a) (i) He should not put the whole jar into the warm water as both the lid and jar would expand together.

(ii)

(b) He could put the jar into a basin of iced water making sure that the lid did not touch the iced water. The jar would contract and the lid could be removed easily.

10 (a) (i) Material of rod (ii) Time taken for coin to drop off the rod (b) glass→steel→copper

11 (a) Air outside the tin was trying to enter it and occupy the space in the tin and this kept the milk from inside thetintoflowouteasily.

(b) She should make another hole on the opposite end of the tin so that air would enter through the other hole and push the milk out.

12 (a) Water, oxygen and warmth (b) Mass

(grams)

Time (days)

(c) Theseedleaffirstprovidedfoodfortheyoungplantto grow so the mass of the seed leaf decreased over time. When the young plant absorbed the food from the seed leaf, it would grow and so its mass would increase.

13 (a) Airhasnodefinitevolumeanditcanbecompressed. (b) The tyres would not be able to withstand the

pressure of the air and burst. (c) He could place the tyres into a tough of water and

observe if air bubbles appear. Air bubbles coming out from the tyres would show where the holes were.


BOOKLET B1

Matter Non-matter

petrolair

sugar

heat shadowrainbow

2 (a) Tofindoutwhether the rootsof theplant take inwater

(b) The water level in beaker B would not change. Therefore, beaker B could be used as a control to compare the water levels between the two beakers tofindoutifwaterwasabsorbedbytherootsoftheplant.

3 (a) C, A, B (b) Material B It is the most absorbent material so it can dry our

wet body after our bath.

4 (a) Waterhasnodefiniteshape. (b) Water has a definite volume and it cannot be

compressed.

5 (a) (i) South

(ii) North

(b) The paperclips were made of a magnetic material. The magnetism from the magnet passed through paperclip A and enabled it to attract paperclip B.

(c) The iron rod is more suitable. The number of paperclips attracted to the iron rod

fell off faster than the ones attracted to the steel rod when the electric circuit was switched off.


A3

6 (a) It was to cool the hot water. (b) The temperature of the water would decrease. (c) The cup gained heat from the hot water before it

was poured into cup B.

7 (a) There was air occupying the space in the bottle. (b) She could poke a hole at the bottom of the bottle so

that the air in the bottle could escape. The air in the balloon could then occupy the space in the bottle.

8 (a) Itwas to find outwhether the stemof thewhitecarnation was able to absorb water.

(b) It would turn blue and red. (c) The water-carrying tubes in the stem absorbed the

red and blue coloured water. It was transported to theflowerstainingitspetalswithredandblueink.

9 (a) It is to allow the tiles to expand when they gain heat on hot days.

(b) The tiles will crack when expanding if there are no gaps.

10 (a) She could not see the toy inside the box. There was no light in the box. Hence, no light was

reflectedfromthetoytoenterEden’seye. (b) Make another hole to allow light to shine into the

box.Thiswillallowlighttoreflecttheimageofthetoy into his eyes.

11 (a) Mould would grow on the cake after a week. (b) The spores of mould were already in the air in the

container before Jovina closed the cover. (c) The presence of moisture, warmth and oxygen

allowed the organism to grow.

12 (a) P glass Q rubber R wood S metal (b) Rubber band (c) No. Rubber is stretchable and even when it is fully

stretched, it will always return to its original shape.

13 (a) Liping should turn object P the other way and check if object M would repel object P. Only magnets with like poles facing each other would repel each other.

(b) Magnets have the strongest magnetism at their poles. Little magnetism exists at the centre of the magnets. Thus, the paperclips were attracted to the poles on both ends, and not the centre of the magnet.


BOOKLET B1 (a) W: Warm-blooded animal that lays egg Z: Cold-blooded animal that gives birth to young

alive

(b) Yes. A lizard is a reptile (a cold-blooded animal) and it reproduces by laying eggs.

2 (a) egg

youngadult

goldfish

(b) Both animals have 3 stages/lay eggs in their life cycles.

(c) Abird’snestfernreproducesbysporesbutagreenbean plant reproduces by seeds.

3 (a) Small intestine (b) Water is absorbed.

4 (a) Fungi (b) B reproduces by spores. (c) C can make its own food but not A. (d) Theaimoftheexperimentwastofindoutwhether

the roots of the plant could take in water. (e) Thestopperpreventedthewaterintheflaskfrom

evaporating into the air.

5 (a) Put the dented table tennis ball into a basin of hot water.

(b) Heat from the hot water will cause the air in the table tennis ball to expand. The expanded air will push the dented surface of the ball outwards.

6 (a) X: liquid Y: solid (b) XwhichwasaliquidhadnodefiniteshapebutY

whichwasasolidhadadefiniteshape. (c) When the ice cream gained heat from the

surrounding air and the metal cup, the ice cream in its solid state would melt to form a liquid state.

7 (a) Airintheflaskexpandedwhenheatedandforceditsway out of the tube. It would escape from the tube as air bubbles.

(b) Theflaskwillloseheattotheicecubesandcontract.Airinsidetheflaskwillalsoloseheatandcontract,thuscreatingmorespaceintheflask.Waterfromthe basin would then enter the tube.

(c) Waterwouldflowoutfromtheholeinthelidoftheglass jar.

(d) Matter occupies space and water cannot be compressed. When air was pumped into the balloon, itbecameinflated.Airtookupspaceintheglassjarand pushed the water out from the hole.

8 (a) Aperiscopemakesuseofmirrorstoreflectimages.Light shines on an object and with the help of mirrors,imageswillbereflectedintotheeyes.

(b) light

9 (a) The iron rod was a magnet too. Only magnets repel each other if their like poles are facing each other.

(b) Drop the iron rod to demagnetise it. Turn the iron rod around so that the unlike poles of

both magnets would attract each other.


A4

10 (a) The plank would tilt towards container Y. (b) Air has mass and it can be compressed.

11 (a) To measure an object, he should let the object sink to the bottom and record the new water level. The difference between the two volumes recorded would be the volume of the object.

(b) He could tie a heavier object to the Styrofoam cube and let it sink to the bottom. He could then drop the object without the Styrofoam cube and measure the volume of the heavier object. The difference between the two sets of volume recorded would be the volume of the Styrofoam.

12 (a) (i) Rib cage (ii) Skull (b) Muscular system (c) His body needed more oxygen to break down the

digested food to produce energy for him to run. His heart had to pump more blood so that more oxygen and energy could reach his muscles to allow him to run faster. As he needed more oxygen and energy, his heart would pump blood faster and he would pant.

13 (a) Cup A. There was an additional layer of cardboard around cup A to slow down the heat gain from the hot drink.

(b) Cup B did not have a layer of air between the cup and the thin cardboard like the one around cup A. Since air is a poor conductor of heat, it would slow down heat gain from the hot drink. Cup A would remain at a higher temperature and the hot drink in cup B would lose heat to the surroundings and its temperature would be much lower after 10 minutes.

Answers to Primary 4 Science Mock Examinations© Singapore Asia Publishers Pte LtdALL RIGHTS RESERVED. Mock Examination 5

A5

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