Ncse Int. Sci. M.c 2008

THE GOVERNMENT OF THE REPUBLIC OF TRINIDAD AND TOBAGO MINISTRY OF EDUCATION

NATIONAL CERTIFICATE OF SECONDARY EDUCATION 2010 (Level 1)

INTEGRATED SCIENCE TIME: 90 MINUTES Student’s Name _________________________________________________ School’s Name__________________________________________________ School’s ID

Student's Number

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TOTAL

UK

KC

NUMBER

QUESTION

INITIALS

MARKER

INITIALS

EXAMINER

NUMBER

TABLE

FOR OFFICIAL USE ONLY

INSTRUCTIONS

Read the following carefully: 1.

This paper consists of two (2) sections. There are forty (40) Multiple Choice questions in Section I and six (6) structured questions in Section II.

2.

Fill in the following information on the Multiple-Choice answer sheet using a 2HB pencil only (if it has not been completed already): -

School’s Name

-

School’s ID

-

Student’s Name

-

Student’s Number

-

Date of Birth

3.

Attempt all questions in Section I. Record your answers on the Multiple Choice answer sheets provided.

4.

Answer all questions in Section II in the spaces provided in this booklet.

5.

You should spend approximately fifty (50) minutes on Section I and forty (40) minutes on Section II.

6.

On the Multiple Choice answer sheet DO NOT Write anything on the top and sides Staple Punch holes Tear Make stray marks

7.

Complete the following on the cover of this test booklet:

8.

-

Student’s name

-

Student’s number

-

School’s name

-

School’s ID

If you are finished before time is called, go back and check your work.

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SECTION I MULTIPLE CHOICE There are forty (40) questions in this section with four (4) options A, B, C, and D. You are required to answer ALL questions. Select only ONE (1) option.

1. Which of the following substances trap sunlight in green plants to produce foods? POTATO

A. B. C. D.

Glucose Water Chlorophyll Soil

SUGAR WATER

Before

2. Micro-organisms which ferment milk to produce yogurt are called A. B. C. D.

After

5. The diagram above shows the crosssection of a piece of potato which was cut and set up before and after some sugar was placed in the cavity dugout. After a short while some liquid appeared in the cavity containing the sugar. The process which best explains this is

viruses fungi mould bacteria

3. To prevent global warming, people can

A. B. C. D.

A. plant trees B. conserve water daily C. increase combustion of fuels D. decrease the use of fertilizers

osmosis hydrolysis oxidation diffusion

6. In multi-cellular organisms

4. DNA testing can be used to

A. different types of cells perform different functions. B. different types of cells perform one bodily function. C. different types of cells perform the same type of bodily function. D. one type of cell performs all the bodily function.

A. determine the sugar content in the blood B. test for cirrhosis of the liver C. test for scurvy D. determine the paternity of a child

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7.

Wh ich

part of the alimentary canal labelled A, B, C, D in the diagram below is responsible for absorption of water?

A

10.

Aerobic respiration produces A. carbon dioxide, oxygen and energy B. carbon dioxide, oxygen and water C. carbon dioxide, oxygen, energy, and water D. carbon dioxide, energy and water

B B 11.

C D

8.

Which of the following gives an example of an infectious and a non-infectious disease?

A. B. C. D.

9.

Infectious Diseases

Non-infectious Diseases

Scurvy AIDS Lung Cancer Obesity

AIDS Lung Cancer Scurvy Lung Cancer

The results of a sample of food tested to find out its contents are shown in the table below: Test

Result

Iodine solution added

Yellow colour

Benedict’s solution added and mixture heated

Blue colour

Shaken with ethanol

White emulsion

The results show the presence of A. B. C. D.

John’s aunt is suffering with constipation. Which of the following could be added to her diet to relieve her of this problem? 12.

A. Orange Juice B. Bran C. Chocolate D. Chicken

What is the place where an organism lives, feeds and reproduces called? A. B. C. D.

3

fat glucose Protein vitamin

A community An ecosystem A habitat A shelter GO TO THE NEXT PAGE

clouds 16. Rain X

13.

SEA SEA A diagram of the water cycle is shown above. What processes do the letters X and Y respectively represent? A. B. C. D.

14.

A. B. C. D.

Condensation and evaporation Condensation and precipitation Evaporation and precipitation Evaporation and condensation

17.

colloid suspension solution gel

18.

A.

SOLUTE

SOLVENT

Sugar

CO2 gas and water

B.

CO2 gas and Water

sugar

C.

water

Sugar and CO2 gas

D.

Sugar and CO2 gas

water

19.

relights a glowing splint extinguishes a lighted splint has no reaction on limewater gives a white precipitate with limewater

In an atom, the number of protons is A. B. C. D.

Which example below shows the solute and solvent present in a soft drink?

I, II, III I, II, IV I, III,IV II, III, IV

The test for oxygen gas is that it A. B. C. D.

Cough mixture that must be shaken before administering is most likely a A. B. C. D.

15.

Y

The solubility of a solute can be affected by I. The nature of the solute II. The temperature of the solvent III. The amount of solute that needs to be dissolved IV. The nature of the solvent

equal to the number of neutrons equal to the number of electrons greater than the number of neutrons less than the number of electrons

The change in state from a solid to gas, is called A. B. C. D.

freezing boiling evaporation sublimation

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20. The separation method shown in the diagram below is

23.

The figure below shows the typical apparatus used for the separation of mixtures. What process is taking place at X?

Solution thermometer water out Bunsen burner A. B. C. D.

X

chromatography. distillation. evaporation. fractional distillation

water in beaker mixture of liquids

21.

Which of the following BEST represents a physical change? A. B. C. D.

heat

Combustion of fuel Burning magnesium ribbon Mixing sand and water Burning of wood

A. B. C. D.

22. The diagram below represents changes in state of substances.

24.

Liquid

Which one of the following gases is NOT considered an air pollutant? A. B. C. D.

X

Boiling Sublimation Condensation Evaporation

Nitrogen Carbon dioxide Sulphur dioxide Oxides of nitrogen

Gas

Solid

The change represented by arrow X is A. boiling B. condensation C. melting D. freezing 5

GO TO THE NEXT PAGE

Study the diagram below to answer Questions 25 & 26.

8P 8N

Use the graph below to answer Question 29.

Atom X

25. Atom X is A. B. C. D.

Carbon Nitrogen Oxygen Sodium

29. The graph shows the solubility of solution z in water (g/100g of water). What is the solubility of Z in g/100g of water at 50 o C?

26. The mass of atom X is A. B. C. D.

8 10 16 24

A. B. C. D.

27. Erosion of stonework, and the falling of leaves are most likely caused by A. B. C. D.

30.

global warming acid rain eutrophication flooding

A. B. C. D.

Michael is making a protective case to store his watch which is sensitive to magnetic fields. Which of the following is the BEST material to make the case? A. B. C. D.

28. Solar panels are used in some countries to provide homes with energy. One benefit of this is production of nitrogen gas production of light energy reduction of the ozone layer reduction of carbon dioxide emissions

35g/100g 45g/100g 70g/100g 80g/100g

Iron Aluminum Steel Nickel

GO TO THE NEXT PAGE 6

35. In the circuit shown below, which lamps will remain lighting, whether the switch is on or off?

31. Which of the following will not affect the strength of a magnet? A. Heating B. Passing a direct current through it C. Hammering it D. Passing an alternating current through it 32. The glass walls of an incubator reduce heat loss through A. B. C. D.

conduction only convection only conduction and convection conduction, convention and radiation

A. B. C. D.

33. Jamilla purchased a sun-shade for the windscreen of her car to reduce the temperature inside. Which of the following is the best colour for the outer surface of the sun-shade?

36. Which ONE of the following devices will demonstrate the energy transformations as shown below?

A. White B. Silver C. Dull black D. Shiny black

Chemical energy

electrical energy

light energy

A. An electric stove B. A fluorescent light bulb. C. A kerosene lamp. D. A battery operated touch light

34. A yellow drink placed in a blue bottle appears to be A. B. C. D.

1 and 2 1 and 3 2 and 3 1, 2 and 3

blue yellow black green

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37. An inflated balloon will shrink if placed in a refrigerator. The lower temperature causes the gas particles to

Piston X

A. move faster and become closer together B. move slower and become closer together C. move faster and become further apart D. move slower and become further apart

liquid 40.

39.

The pressure exerted on the piston Y by the liquid in the diagram below is A. equal to the pressure at Piston X B. greater pressure at Piston X C. less pressure at Piston X D. twice the pressure at Piston X

38. Which of the following objects has the greatest momentum? A. B. C. D.

Piston Y

A motorcycle moving at 60 km/h A small car moving at 60 km/h A small car moving at 0.06 km/h A truck moving at 60 km/h

The rectangular block shown below is 90N (Not drawn to scale). On which side (A, B, C, D) should the block be placed to exert the least pressure on the surface on which the block is resting? B

C A

D

GO TO THE NEXT SECTION 8

SECTION II There are SIX (6) questions in this section. Answer ALL questions in the spaces provided. 1. John has been working as a labourer at a landfill for ten (10) years where fires at the landfill produce a lot of smoke and ash. He also enjoys smoking cigarettes. Recently, John has visited his doctor on several occasions because he has difficulty in breathing. (a) (i) What TWO (2) diseases can John develop from exposure to the smoke at the landfill? (2 marks) __________________________________________________________________ __________________________________________________________________ (ii) Explain how John has contributed to the health problem he is having? (1 mark) __________________________________________________________________ __________________________________________________________________ __________________________________________________________________

(iii) Which system in John’s body is affected by the smoke at his workplace and the cigarettes that he smokes?

(1 mark)

_________________________________________________________________

(b)

(i) How would you classify such diseases that are caused smoking cigarettes? (1 mark) _________________________________________________________________

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(b)

(ii) What are two (2) suggestions you can make to help John reduce the problems he faces due to smoking? (2 marks) _________________________________________________________________ _________________________________________________________________ _________________________________________________________________ _________________________________________________________________

(c)

Give TWO (2) ways the government of a country can help to reduce the effects of smoking? (2 marks) __________________________________________________________________ __________________________________________________________________ __________________________________________________________________ __________________________________________________________________ __________________________________________________________________ __________________________________________________________________

(d)

Explain what is meant by “second hand smoke”. (1 mark) ___________________________________________________________ ___________________________________________________________ ___________________________________________________________ ____________________________________________________________

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2.

The diagram shows how water is recycled in nature. water vapour in air

C

A

transpiration

water in ponds, lakes, river

B

water in plants

(a) (i) Name the THREE (3) processes labelled A, B, and C in the water cycle. (3 mark) A._____________________________________________________________ B._____________________________________________________________ C.______________________________________________________________

(ii) Give the name of ONE (1) process in which plants use water. _______________________________________________________________ (1 mark) (b)

Name THREE (3) types of water pollutants and state their harmful effects. (3x 2 marks) I.

Pollutant:_______________________________________________________

Harmful Effect:___________________________________________________ ___________________________________________________________________ ___________________________________________________________________

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II. Pollutant:________________________________________________________

Harmful Effect:__________________________________________________ __________________________________________________________________ __________________________________________________________________

III. Pollutant:________________________________________________________

Harmful Effect:__________________________________________________ __________________________________________________________________ __________________________________________________________________

3. Three gases in the atmosphere are listed in the table below. (a)

(i) Give ONE (1) use of each gas listed.

Gases in the atmosphere

(I)

(3 marks)

Use

Carbon Dioxide

(II) Nitrogen

(III) Oxygen

(ii) Which gas in the table has the greatest composition in the atmosphere? _________________________________________________________________ (1 mark) GO TO THE NEXT PAGE 12

(b)

What part does deforestation play in changing the composition of air? (4 marks) _______________________________________________________________ ________________________________________________________________ ________________________________________________________________ ________________________________________________________________ ________________________________________________________________ ________________________________________________________________ ________________________________________________________________

(c)

Give ONE (1) example each, of ways in which policymakers and industrialists can help reduce air pollution. (2 marks) (i)

Policy makers:

_________________________________________________________________ __________________________________________________________________ __________________________________________________________________ __________________________________________________________________

(ii) Industrialists: __________________________________________________________________ __________________________________________________________________ __________________________________________________________________ __________________________________________________________________

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4. The composition of four different types of mixtures, A, B, C and D are shown in the table below. (a) Complete the table by writing in whether mixtures A, B, C and D are solutions, colloids or suspensions.

Mixture

A.

Water & Sand

B.

Sugar & Water

C.

Starch & Water

D.

Powdered Chalk & Water

Type of Mixture

(4 marks)

(b) What method can be used to separate the components in mixtures A and B: (2 x 2 marks) (i) Mixture A __________________________________________________________________ Explain why you would choose that method. __________________________________________________________________ __________________________________________________________________ __________________________________________________________________ __________________________________________________________________

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(ii) Mixture B _________________________________________________________________

Explain why you would choose that method. __________________________________________________________________ __________________________________________________________________ __________________________________________________________________ __________________________________________________________________

(c) (i) Would the method (s) used in Part (b) to separate mixtures A & B be suitable for separating Mixture (C)? Explain why. (2 marks) __________________________________________________________________ __________________________________________________________________ __________________________________________________________________ __________________________________________________________________ __________________________________________________________________ __________________________________________________________________ __________________________________________________________________

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5. (a) What is a magnet?

(2 marks)

__________________________________________________________________ __________________________________________________________________ __________________________________________________________________ __________________________________________________________________

(b) The diagram below shows a bar magnet.

North Pole

N

S

South Pole

(i) Briefly explain what would happen if the North Pole of a similar magnet was brought towards the North Pole of this magnet. (1 mark) __________________________________________________________________ __________________________________________________________________ __________________________________________________________________ __________________________________________________________________ (ii) What would happen if the North Pole of a similar magnet was brought towards the South Pole instead? (1 mark) __________________________________________________________________ __________________________________________________________________ __________________________________________________________________ __________________________________________________________________

GO TO THE NEXT PAGE

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(c)

A magnet is cut into three pieces as shown in the diagram below. What poles would be found at ends marked X and Y respectively. (2 marks)

X

N

Y

S Y Magnet

X = _________________________ pole

Y = _________________________ pole

(d)

The diagram below shows a soft iron bar placed in contact with a magnet and then brought into contact with paper clips. S

N

Soft Iron Bar

Paper clip (i) Briefly explain what happened to the soft iron bar and the paper clips (2 marks) __________________________________________________________________ __________________________________________________________________ __________________________________________________________________ __________________________________________________________________ _________________________________________________________________ GO TO THE NEXT PAGE 17

(d)

(ii)What will be happen to the paper clips if the magnet is gently separated from the soft iron bar in the diagram above? Explain why. (2 mark) ________________________________________________________________ ________________________________________________________________ ________________________________________________________________

6.

The diagram below shows a model created by a student to show an eclipse of the sun by the moon. Y X Z Screen

LINES

(a)

State what each of the following represents in the model above. Bulb

____________________________

Ball

____________________________

(4 marks)

Lines ____________________________ Screen ___________________________

(b)

Explain what you would observe at positions X, Y and Z when the bulb is turned on. (3 marks) __________________________________________________________________ __________________________________________________________________ __________________________________________________________________ __________________________________________________________________ GO TO THE NEXT PAGE 18

(c) The diagram below shows a ray of light falling on a rectangular glass block. Complete the diagram below to show what happens to the ray after it strikes the glass block. (2 marks)

Incident ray

Glass block

END OF TEST IF YOU HAVE FINISHED BEFORE TIME IS CALLED GO BACK AND CHECK YOUR WORK.

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