Y2 Final exam 09_10_answers

8/6/2019 Y2 Final exam 09_10_answers

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AMERICAN ACADEMY LARNACA

FINAL EXAMINATIONS 2009 - 2010Subject: SCIENCE Year: 2

Teachers: Mrs. E. Michaelides, Miss P. Papadopoulou, Miss C. Polychroni, Mr. P. Afantitis

Date: 14/06/2010 No. of candidates: 145 Duration: 1~hours

Name: Section:

GRADED

The paper bas TWO sections.Section A is Multiple Choice.There are 50 questions, one mark each.'Secti'on B'f,rStiilctUfoo'Ques.ti6ris::",- , .".~. ' ..." ....There are a total of S O marks.You are advised to spend about 45 minutes on each section.

TOTAL FOR PAPER: 100MARKS


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SECTION AMULTIPLE CHOICE QUESTIONSThere are 50 questions in this section. Each question is one mark. Spend about 45 minutes.

Keeping it balancedAl. A growing child needs 240 g of carbohydrates daily.

Use the information of the nutrition label below to decide how many slices of bread will provide this.Typical values per sliceenergy 100 kcalprotein 5gcarbohydrate 16 gfat 2gfibre 3 gsalt 1 g

240 g of carbohydrates will be provided byA 5 slices of bread@ 15 slices of bread B 10 slices of breadD 20 slices of breadA2. Maria tested her bread and butter with iodine solution.

Which nutrient was she testing for?

A FatC Protein B Fibre StarchA3. A balanced diet isA a diet with lots of fruits and vegetables

; _,,~_@)~;~~::~,~~~~~ofa'-Wid~Variety of -:B a meal containing what you like" D-,~"what,yolleatevery, day: '

A4. To make new cells for growth and repair of the body you need to include in your dietA a lot of butterC five fruits and vegetables a day

B a lot of olive oil@ milk, eggs and fishTW77 over


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AS. Digested food is easily absorbed in the small intestine because the small intestineA has millions of alveoli ha s millions of villi B has millions of veinsD is very thick

Fighting backA6. Panayiotis is suffering from common cold.

This is a disease caused byA bacteria viruses B fungiD yeastA7. Athlete's foot is a disease that spreads byA drinking contaminated waterC keeping pets at home

B eating contaminated food touchA8. White blood cells are part of the body's natural defences against microbes.

The white blood cells kill microbes([) by swallowing (engulfing) themC by producing mucus

B by producing acidD with their cilia

A9. Immunisation includes an injection of a vaccine which containsA antibioticsC inactive antibodies

B dead white blood cells inactivemicrobesA10. Which natural defence mechanism is used by the body in a skin cut?

... '-..It forms a blood clot (scab)to stop microbes getting in

It contains acidthat kills most harmful bacteria

C It produces a chemicalthat destroys microbes

A

D It produces an antiseptic fluid

Turn over


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The feeding frenzyUse the following food web to answer Questions All- A15.

~,

~ Hawk

Marshgrass

All. Shrews and frogs are competing for@ ) crickets onlyC grasshoppers only

A12.The top predator is theA frogC snake

.-..:-' ".-'

/~Grasshopper

\,--

Cricket

B grasshoppers and cricketsD hawks and snakes

hawk--D .shrew


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AB. Producers like marsh grass and cartail are important because theyA have long narrow leaves make their own food using photosynthesis B have xylem vessels that carry waterD produce sporesA14. The number of different food chains in the food web above is_ 4 a . 3(95 B 4D 6AlS. If all grasshoppers are killed by insecticides, which organism will increase in numbers?A FrogsC Snakes

Marsh grassD Shrews

Exchange rates

x + Y z + w (+ energy)A16. This is the general form of the equation for aerobic respiration.

Y is a gas breathed in from air.W is a colourless liquid.

What chemicals are Y and W?A Y = Carbon Dioxide

W=WaterB Y = Carbon Dioxide

W =GlucoseY= OxygenW =Water D

Y=OxygenW =Glucose

A Glucose molecules are absorbedinto the blood stream through a membraneMaking small glucose moleculesfrom big starch molecules

Glucose reacts with Oxygento release energyOxygen and Glucoseare moved around in the blood streamc D


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A18. Constantina placed a lighted candle in ajar containing normal air and another in ajar containingexhaled air (air breathed out).

~ ..[ ' - - L - exruued! 4 : airI i~ I;.-IN~

T h is c an dle goes out first

~') inhaledI lT(normal) airI ~ ' " . rtoThe candle in the exhaled air burned for a shorter time because the jar contains

A less Carbon DioxideC more air

less OxygenD more water vapour

A19. Tissue fluid helps with the exchange of substances between blood and body cells.It transfers

A Carbon Dioxide and Glucoseto body cellsGlucose and Oxygenaway from body cells

B Glucose and Carbon Dioxideaway from body cellsOxygen and Glucoseto body cells

c A20. The heart pumps blood intoAC

ArteriesVeins

B

CapillariesAll blood vessels at the same time

Elementary!A2l. Which of these statements is not true about elements?k tanno~be


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A23. The following text describes a substance.It doesn't change to simpler substances when you heat it st ro ngly.It h as a h ig h m elti ng point and it is a solid aJ room temperature.It conducts elec tric ity and is a good heal conductor .

'Which is correct for the substance described above?AC

It is a compound of non-metalsIt is an element and a non-metal

B@ It is a compound of metalsIt is an element and a metalA24. The name of the compound with chemical formula Ca(N03)2 iso Calcium NitrateC Nitrogen Calcide

B Calcium NitrideD Oxygen Nitrate

A2S. 2.4 g of magnesium react with 1.6 g of oxygen in the air to giveA 0.8 g of magnesium oxideC 2.4 g of magnesium oxate

B 2.4 g of magnesium oxide 4 g of magnesium oxideReactive staff!

A26. In a chemical reaction elements cannot be changed or lost.In aprecipitation reaction a solid is formed when two solutions are mixed.The diagram below shows a precipitation reaction ..

'~~.~~~~--.-:::=~_.. :..~d

- - - ,T ',< ~ ._ ii. .. - - '. 0 ." , . '"." ~. -.

potassium nitrate--- solution

>solid- -The name of the solid formed is

A Lead ( i i ) Lead IodideC Potassium D Potassium Nitrate

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Use the following particle diagrams to answer questions Al7 - A30.Each diagram may be used once, more than once or not at all.

~ ~# ~ v 0 0 C O Ito 00 B C DChoose the letter of the substance that ...Al7 .... is a pure compound

A ~ C D

Al8 .... is a mixture of elementsA B C C V

Al9 .. , .could have the formula HCIA c D

A30 .... could be impure CO2B c D

Hot staff!

This is a night storage heater.Youcan see what it contains inside ..An electrj~heatet: warmsthe.bricks bYl:'li@ty.~:,:,'...Tneie:bricRS theil' ~veo'ff'lliefrehergy dntirlg theday: .Use this information for Questions A31- A35.

A31. Which of the following will not allow more heat to be stored?A Use more bricks of the same size Make air spaces between the bricks B Use the same number of larger bricksD Heat the bricks to a higher temperature

TU/"/? over

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air in

A32. Air becomes hot mainly byA conductionC evaporation

A33. The hot air rises becauseAC

it contractsit gains mass

Cold air flows into the heater and moves out as hot air.It becomes hot by contact with the bot bricks.

B convection radiation@D

it expandsit loses mass

A34. Where is the best place to place the night storage heater in the room?

p Q

R

AC

Position P

s

Position RB Position Q

~ PositionS

oo

.. .~..

Turn over


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A35. A shiny sheet of metal can be placed behind the beater.

Shinymetalsheet

The metal sheet makes the beater better and more efficient becauseA@ ) it conducts heat away from the wallit reflects radiation into the room BD it conducts heat to the wallit reflects radiation out of the room

Know where you are

The Paris - Dakar rally used to be one of the most exciting andchallenging events for car drivers.Part of the route passed through the Sahara desert.With no roads or landmarks the drivers often had to use their compassesto navigate.Use this information for Questions A36 - A40.

A36 . What objects must the compass be kept away from for correct navigation?A Aluminium body Steel pump B FrontglassD Plastic interior

" -" . . . .: :::C :A3'r.The'U :se "of a compass i s possible-beeatiSeofth6 Earth's~";;:

A electric fieldC gravity

B energy

magnetic field

9

':', ,.' . .. - ..

Turn over


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A38. You can see two of the cars that took part in the rally.p Q

Which car needs more powerto move at the same speed on the same ground?({) CarPC They need the same power

B CarQDThe power does not depend on speed

.U9. On level road the cars can move at steady speed.What can we say about the forward and the backward forces onthe cars as theymove at steady speeds?A The forward force is greater B The backward force is greater if the caris moving uphill The two forces are equal to each otherThe forward force is greater if the caris moving downhillA40. The drivers would deflate (remove air from) the tires when moving on sand.This stopped the cars from sinking.

~~~~11!~,.lmll~i~!~1"i~.1&.~4t /iHard surface Deflated tires

A the area becomes less the pressure becomes less B the mass becomes lessD the weight becomes lessTurn over

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Light gamesSome students study the shadow left by a sbeet of shiny metal on the ground because of the Sun.Use this information for Questions A41 - A44.

Shiny metal piece

A41. Which of the four shadows is the correct one?B c

The picture shows how light is reflected from the metal surface.bluegreen

A42. What colour does the metal appear?([) Blue-

-".~ "C' Red 'B Green.'-D "\Vliite

A43. Shining only red light on the metal sheet will make it appearV blackC red

B blueD violet

11

--------------------_ ---

D

TU171 over


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A44. Below is given one of the angles as light hits the metal surface

green

The angle of reflection for blue light is equal to

(9 300C the angle of refraction

B 600D the normal

A45. White light passes through a glass prism.

Which gives a correct combination of what colours P, Q and Rare?A P=BlueQ =Yellow

...."_'"; R=Red .._:"".-. ; ; :' : . 7 _ - " ; ./;''-''~C' P -= '1ted '''''::Q=BlueR=Green

lE) P =RedVQ=Orange"",A' R,=,Blu.\'f._., .,'... -; '." ..

" IY~::P~=LTid~ ,;~:'.-'


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Sound evidence.A46. Sound cannot travel inA gasesC solids

B liquids

vacuumA47. The drums are important musical instruments in any group or orchestra.

B. The sticks

C. The membrane

D. The outside casing

What vibrates to produce sound in a drum?A B

Use the following information to answer Questions A48 - A50.4 different sounds are analysed using an oscilloscope.

pv

f \ f \ (\ L - / \ ... .-' ....\ ! , - ...). \ - ..\1 / \ / \ 1

A48. Which picture represents the loudest sound?A SoundPC SoundR

SoundQD Sound S

J 3

A. The drummer

D

Q

1 \ 1 '\I 1 I \ I \I \ I \

\ 1 / \ I\ \ I I\ \ 1 / \/

t . 1 \ - 1\ .. . . . : ; i . ;\ 1 / ' ~l\i . . . . . . ,.,:~ _ . ~.,.. ..I !


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Here are the four sounds again for convenience.

I

V IV

1 \ 1 1 \ . \I / 1 \ \I \ f \1 \ I \ I\ \ / /\ 1 / \ /

p Q

1 / \ 1 \ I\ I 1 1 \\ I I \\1 1 1 \ / \/

'\ j\ /1 \\ 1 / 1\/ \/R s

A49. Which picture represents sound with the highest frequency? SoundPC SoundR

B Sound QD Sound S

A50. Another sound X is analysed by the same method.

X

Which sounds P - Q have the same pitch and amplitude as X?. . .~C V Pit~h:P .

Amplitude: RD Pitch: P

Amplitude: Q

..C Pitch: SAmplitude: R

C Pitch: RAmplitude: P

TOTAL FOR SECTION A: 50 MARKS

Turn over for Section B


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SECTIONBSTRUCTURED QUESTIONSThere are a total of 11 Questions and 50 marks in this section. Spend about 45 minutes.

B1. The diagram below shows part of the human digestive system.~_-+t__ Gullet. . - - ,,

Small intestine

Stomach

~~~~~~~-+ -arge intestine(a) Describe how food is moved through the gullet into the stomach ..............~~.~ ~~ :5>~\\~ ~.~.~ ~ ~.p~.~.e.).k ~ .......... ~ \Q~ :?~.\\.~ .[1mark}(b) The stomach produces a liquid that contains chemicals that digest proteins.

(i) What are these chemicals called? ~.1.,\.'M.~S .[1mark]

(ii) What conditions do these chemicals need to work efficiently?.. ......fJL\:::.~ { ~.~.~ ~~~.~ .

[1mark](iii)"Whatha.ppens-to"protems' wherrtheyare dfge~T'-~;" .";', '~c:';::' ...,

..................... t!-:>.~.~.~ ~ ?:~':-.\\ ~..~.~.~ [i.~~.~ki(c) Which part of the digestive system removes I absorbs water from undigested food?......................~~ i~.~.\;.~ .

[1mark][Total for Q.Bl: 5 marks]

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Bl. Bread dough ( ~ U J . L 1 1 ) is made of yeast, flour, water, a little sugar and salt.Vasiliki did an experiment to see if sugar helps the dough to rise.She prepared 5 measuring cylinders of dough with different amounts of sugar.She measured the volume of dough in each measuring cylinder after 30 minutes.

1 ~~ = 1 - - " ' "ith 1 1sugar c d . ' \ ,The results of her experiment are in the table below.

Amount of sugar Volume of doughin the douzh (R:) after 30 min (cnh

0 405 5210 6615 7420 80

(a.) How does the amount of sugar affect how high the dough rises?

............~J..(Y>\ ~ 5~Qv.":" ~ "~f ~.~~~ b .

............ .pVo.~\.SI,., c . Q.l;." .' .'\ [1mark](b) What do yeast cells need sugar (glucose) for?

.............. ~\~\.~ .[1mark] .. , -.' .--'.,

(c) What is the gas that makes the dough rise? COb .[1mark](d) Bread is baked for 30 minutes at 200C.

What do you think happens to yeast during baking?. . . . . . . . . . . . . . . . k = ,~ \ \ .~ . ~ .

[1 mark}(Total for Q.B2: 4 mark}

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B3. The diagram below shows the buman lungs and related structures.

!1!i------ Trachea

\,'>:---- Lungs\(a) What substance do the lungs excrete (get rid of)? .. , ~~ ~.Q.':*.\..~ .

[1 mark](b) What does the trachea contain that keep the lungs clean?

............................................................................. ~~\.\.~ .[1mark]

(c) The table below shows the amount of Oxygen and Carbon Dioxide in the blood entering andin the blood leaving the lungs.

Gas Amount of zas in 100 em3 of bloodBlood enterina the lunas Blood Ieavinz the IunzsOxygen 11.0 cm3 19.0cm3Carbon Dioxide 58.0 cms 50.0 cm3

(i) How many cms of Oxygen are absorbed in the lungs by 100 cm3 of blood?\ G \ -0 - It 0

Amount of Oxygen = .....$ ."..9. ..... cnr'[1mark]

- - .....-,-:'.- (ii) Name-the-cells ia-theblood.that absorb Oxy~Ilin'thelun~:: ..........................'.p.~ ~\~ ~\\S " .[1mark]

" " . .~..:,~,~~ .

(m) For faster gas exchange, blood in the lungs travels in numerous thin blood vessels.What are these blood vessels called? ~.~. \\~. a..v.-.~.~ .

1 1 mark][Total for Q.B3: 5 marks}

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____________ ._..__. --__-0--


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E4. (a) The photograph shows a sea turtle on a sandy beach.Scientists think that some species of sea turtles are at risk of becoming extinct.

(I) Think of one reason that has lead to the decrease in the population of some sea turtles .....................~ ~ ~ .[1 mark}

(ii) Give one characteristic of sea turtles typical of the animal group they belong to .. . . . . . _ J . . . v . ~ $.


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(b) Dandelion plants are very common in lawns.They are not very coIllI!?:0Il in wo()dland(forest area).(i) Suggest a reason why dandelion plants are not common in woodland.

. ~ ................~.'~.'" s.~\~ .[1 mark]

Andreas found 5 dandelion plants in 1 m2 sample.(0) Estimate the number of dandelion plants on the lawn shown above.Show your working.

Number of dandelion plants = \1 .s. .[1mark]

(ill) How can Andreas make his results more reliable?................\L(.J J . . . . 0 . - \ " . . . ~ ?..{.~~ .

[1 mark][Total for Q.B4: 6 marks]

T w ' 7 7 . over

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B5. The diagram below is a sketch of the periodic table showing the positions of elements X, Z, Q and Y.- -X Q

y

ZUse the letters X, Z, Q and Y and the periodic table above to answer the following questions.Give the letter of

(i) an element that is a good conductor of electricity: ..X - J' . = t : . . . . . . [1mark](ii) an element that is a gas at room temperature: '/ .

[1mark](ill) When a metal and anon-metal react together, a salt is produced. Give the letters of two elements

that could form a salt.AND

[1mark](iv) Give the letters of two elements that could form an alloy when mixed ....x . .... .ND [1mark]

[Total for Q.B5: 4 marks]

, . '........ ~,.'.,,..t.

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B6. The grapb below shows bow the freezing point of a water - ethanol mixture changes with concentration.The differentmixtures have different percentage concentration of ethanol in water.

e.g. 20% concentration of ethanol in the mixture means thatthe mixture contains 20% ethanol and 80% water.

% Concentration of ethanol in watero 10 20 30 40 50 60 70 80 90 100

-2030

50Freezing point(degress Celsius)

-70-8090

-110120

(i)What is the water - ethanol composition of the mixture that has a freezing point of -60 CC?Water: ..... t : s . : 'b . Q . . % Ethanol: ~.o %

[1mark]ell) What is the freezing point of pure ethanol? .. :-:.\\ 5 . C

[1mark](Ui} St il idafd '"ZiWrii ia-''' fs 'ar i"aJooooli t\diin:k'tJlatbontairis 40% 'ofetfianor:~ '

Home freezers can get to a temperature as low as -10C.Explain why "Zivania" does not freeze in home freezers .

..........\ 0 ~~ ~.h ~\~~ ~.~i . - : J ( .

~~.~. . .-.:~"--- :;

[1mark][Total for Q.B6: 3 mark]


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B7. Below we see how the particles are arranged in a compound containing calcium and oxygen.

Calcium atom

(i) Give the name for the above compound: c .~\.c.~~ ~--...~ "[1mark]

(ii) Use the diagram to decide which formula is the correct for the compound .. Circle the correct formula

(iii) Explain why this is a compound and not a mixture of calcium and oxygen .[1mark]

............... ~~ ~.~~ \.1~9~.\~ .

[Total for Q.B7: 3 marks][1mark}

. . .~.

22

Turn over


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BS. Adding oil to an engine is important because it reduces friction and protects the engine.A new type of oil is tested.It is cooled until it is solid and then warmed to find its melting point.Below you can see the apparatus used and the data obtained.

StopwatchtJ,"~ .~~ Time (min) Temperature (OC)0 -201 - 1 02 -53 -5

I - IIi "t +;5 -56 -27 18 49 7

Oil

(a) At a certain time the thermometer shows the following reading:C-5

- 1 0

What is the temperature shown by the thermometer? :--:-. ~~ .(b) Plot the data on the table in the space below.

10 11 I1 1 I II II IiI II5 ITemperature

(deg Celsius)0

...!.. r. Y,"

-5-10 I I

I-15 .III

I I, ! I-20 II i .i I, I I

[1mark)

..""..,. ::..~~.~.

I j I , ; I III !I

I I1III

" ':'f~..- ,: " _ , ',-,1. ; ,~ I II I1 .I

I IIIII,

!i !! I i

11mark]


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(c) The pictures below show oil at different times.

A B c'Which picture corresponds to oil at........1min ....h...4min ....~ .....7min

[2 marks](d) To protect against friction the oil must flow.

The average temperature in some Northern countries can reach -1 0 D C during winter.Use your graph to explain why this type of oil is not suitable for these countries in the winter.. . . . . . . . . . . . . . . c J . ~ \ ~ ~ ~ \ ~ . ~ . ~ ~ . ~ . \ ~ ~ !-()\.~ Y\d..~.~ .

[1 mark][Total for Q.B8: 5 marks]

[1 mark}

B9. John and Peter are looking at a toy plane that moves around a pivot.It has to balance horizontally first by sliding the counterweight.

Sliding counterweight

Toy plane~

(a) Underline / Circle the correct phrase in italic.To balance the plane horizontally the counterweight should slide

to the left..towards the pivot to (he righ!, away from the pivot~

Turn over

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(b) The plane balances with the counterweight at position X.

1i1A heavier model is also available with "bombs and fuel tank under the wings and fuselage".

heavier \"' 1 ====""'F""""''''''''''''''''''=='''''''''''''''''''y=9 ~ j= = 0 : : : : Y = ; : " : " ' model ! /1~=

"Bombs and /fuel tank"

The plane balances with the counterweight at point Y.Circle on the drawing above where point Y should be compared to point X.

[1 mark](c) John says that "the resistive forces on the heavier model will be larger and will stop spinning faster".

Name one such force and suggest why John may be correct .. . . . . . . . . . . . . .C A . ~ . v : ~\"":>~~ \ ............... ~~It. 5:.~.k~ ~.~ .

[1 mark}

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(d) The plane has a magnet inside.Peter suggests that they could use another magnet to spin the plane.He says: "use attraction if you place the magnet at the front, or repulsion if you place it at the back".

Look at the fields below.

A B c(i) Write the letter of the field that corresponds to the magnets

attracting: .... ~ ... repelling: .. , S > . . . . .John suggests using an electromagnet connected to a battery.He says: "We can control the attraction now".

To battery

........................ ~~~.~ ~.I(".~ .

[1 mark]

--:-"'-''!.- ~~.~ - .

Turn over


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(b) Below we see the picture of a human ear.

Ts

R

Q

Write the letter of the structure to which the information below refers.Information StructureThe ear drum can rapture by loud noise ~Qut can sometimes repair itselfThe cochlea has the function of analyzing the sound \Zut can be damaged permanently by loud noise

. The ear canal can be blocked by wax fut can be cleaned to restore hearing ability[3 marks]

(c) The table shows the frequencies some animals can hear.Animal Frequencies they can hear (Hz)cat 60- 65000d02 15-50000

grasshopper 100 - 15 000bat 1000 - 120 000

Ultrasound is sound that has a frequency higher than what humans can hear.Identify two animals of the ones above can hear ultrasound?

L._._ ._~~~ , _._. _ .~~t- [Total for Q.Bll: 5 marks]

TOTAL FOR SECTION B: 50 MARKS

ENDTOTAL FOR PAPER: 100MARKS

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Y2 Final exam 09_10_answers