Time(day)

Mass of copper(II) sulphate crystals (g)

3 2 1

SMK (P) SRI AMAN,

PETALING JAYA

MID YEAR EXAMINATION 2009

SCIENCE

FORM FIVE

PAPER 2 Time : 2 ½ hr

Name: ___________________________________________ Form : 5 ______ Instructions: This paper is divided into 3 parts: Section A (20m), Section B (30m) and Section C (20m).

Answer all the questions in Scetion A and B and two questions in Section C

Section A (20 marks) 1.

The above apparatus was set up by a student who was studying the crystallization of copper (II) sulphate. The copper sulphate crystals were weighed every day and the results are shown in the following table.

Time (day)

0 1 2 3 4 5 6

Mass of copper (II) sulphate crystals (g)

1.0 1.5 x 2.5 2.8 3.0 3.0

a) i) Using the data in the table, draw a graph to show the mass of copper(II) sulphate crystals against time.

0 1 2 3 4 5 6 (2m) ii) From the graph in (i), determine the value of X.

X: …………………………………………………. (1m)

2

b) What is a saturated solution?

…………………………………………………………………………………………………………………………………………………………………………

(1m)

c) Name one factor that affects the crystallization process.

………………………………………………………………………………………………………………………………………………………………………..

(1m)

2. A group of students in 5 Melur conducted an experiment to investigate the effects of drugs on mice. Four similar mice were given different doses of cocaine and their response within 24 hours was recorded as shown in the table below.

Mouse Dose of cocaine Condition of mouse

K ½ dose Slept for six hours

L 1 dose Slept for four hours

M 1½ dose Slept for three hours

N 2 dose Active all the time

a) What is the aim of the experiment above?

……………………………………………………………………………………………………………………………………………………………………………..

(1m)

b) Based on the observation above, what can you infer about the nature of cocaine?

…………………………………………………………………………………………………………………………………………………………………………….

(1m)

c) State the variables in this experiment

i) Manipulated variable : …………………………………………………………………………………………………

ii) Responding variable : ………………………………………………………………………………………………..

(2m)

d) What is the operational definition of a drug?

……………………………………………………………………………………………………………………………………………………………………………..

……………………………………………………………………………………………………………………………………………………………………………..

(1m) 3. The diagram below shows an object placed in front of a lens.

a) Name the type of lens used.

……………………………………………………………………………………………………………………………………………………………………………

(1m)

b) ‘F’ is the focal point of the lens used. What is meant by ‘focal point’?

…………………………………………………………………………………………………………………………………………………………………………

(1m)

c) On the diagram above, draw a ray diagram to show the image formed by the object. (2m)

3

d) State the characteristics of the image formed in (c).

………………………………………………………………………………………………………………………………………………………………………

(1m)

4. The diagram below shows the apparatus used in the process of producing alcohol.

a) What is the name of this process that produces alcohol?

……………………………………………………………………………………………………………………………………………………………………………

(1m)

b) Why is yeast used in this process?

………………………………………………………………………………………………………………………………………………………………………....

(1m)

c) The conical flask is stoppered to prevent air from entering. Suggest why air is not allowed in the flask.

…………………………………………………………………………………………………………………………………………………………………………

(1m)

d) After a week, the product of the reaction between glucose and yeast is purified by the using the apparatus set up as shown in the diagram below.

i) What is the purpose of using apparatus P?

……………………………………………………………………………………………………………………………………………………………………….

(1m)

ii) The process of purification as shown in the diagram involves two stages. What are they?

………………………………………………………………………………………………………………………………………………………………………..

…………………………………………………………………………………………………………………………………………………………………………

(1m)

Product of earlier process

4

Section B (30m)

5. The diagram below shows the nervous pathway when the hand of a person accidentally touches a hot

kettle.

a) Name the structures P and Q in the boxes provided in the diagram. (2m)

b) On the diagram, indicate with arrows to show the flow of the nerve impulse. (1m)

c) i) Name the kind of action shown in the diagram.

………………………………………………………………………………………………………………………………………………………..…………………

(1m)

ii) The diagram above shows the human nervous system. Label the part which controls the action stated in (c)(i) with the letter ‘X’. (1m)

iii) State one characteristic of the action mentioned in (i).

…………………………………………………………………………………………………………………………………………………………………………

(1m)

6.

The diagram above shows an incomplete periodic table that has been divided into five sections; J,K,L,M and N.

5

a) State how the elements are arranged in the periodic table.

……………………………………………………………………………………………………………………………………………………………………………..

…………………………………………………………………………………………………………………………………………………………………………….

(1m)

b) State the number of groups in the periodic table.

……………………………………………………………………………………………………………………………………………………………………………

(1m)

c) Based on the diagram above, state the section that consists of

i) metals that are very reactive with water : ……………………………………………………………….

ii) elements that do not react with any other element : ……………………..……………………………………….

iii) non metals : ……………………………………………………………….

(3m)

7. The diagram below shows an unstable nucleus gradually changing into a more stable nucleus.

a) Name process Y in the diagram.

Process Y : …………………………………………………………………………………

(1m)

b) State one method to detect the rays P, Q and R.

………………………………………………………………………………………………………………………………………………………………

(1m)

c) What is the effect of an exposure to these rays?

………………………………………………………………………………………………………………………………………………………………

(1m)

d) The diagram below shows the penetrating power of ray R.

i) Name ray R.

Ray R : ………………………………………………………………………..

(1m)

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ii) State one use of ray R in agriculture.

…………………………………………………………………………………………………………………………………………………………………..

(1m)

c) State one use of cobalt-60 in the medical field.

……………………………………………………………………………………………………………………………………………………………………..

(1m)

8. The diagram below shows a problem occurring in the layer of atmosphere above the Antartica.

a) What is the problem shown in the diagram?

……………………………………………………………………………………………………………………………………………………………………….

(1m)

b) What is the function of layer P?

……………………………………………………………………………………………………………………………………………………………………….

(1m)

c) Based on the given diagram, what are the chemicals released by the items used that causes the problem stated in (a)?

……………………………………………………………………………………………………………………………………………………………………….

(1m)

d) What is the effect of the problem stated in (a)?

………………………………………………………………………………………………………………………………………………………………………

(1m)

e) Suggest two ways of reducing the problem.

………………………………………………………………………………………………………………………………………………………………………

……………………………………………………………………………………………………………………………………………………………………..

(2m)

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9. The diagram below shows a flow chart which explains the extraction process of palm oil.

a) Identify stage P and stage Q.

Stage P : …………………………………………………………… Stage Q : ……………………………………………………………

(2m)

b) What is the purpose of adding activated carbon at stage Q?

…………………………………………………………………………………………………………………………………………………………………………

(1m)

c) Name one vitamin found in palm oil that is good for human health.

…………………………………………………………………………………………………………………………………………………………………………

(1m)

d) Tick (√ ) for the part of oil palm fruit that can produce oil.

…………………….. …………………….. ….………………….. …………………………

(1m)

e) Name an agency in Malaysia that has been established to conduct research on the oil palm industry.

………………………………………………………………………………………………………………………………………………………………………….

(1m)

Sterilization

Use of hot steam

Crushing

Separates mesocarp from the shell

Stage P

Separates the fruit from the bunch

Stage Q

Use of hot steam and activated carbon

Extraction

Extracts the oil

Filtration

Filters oil from solid particles hot steam

Husk Mesocarp Kernel Shell

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Section C (20m)

Answer Question 10 and either Question 11 or question 12.

10. Study the following statement:

a) Based on the situation above, write a hypothesis to relate the temperature and the growth of bacteria. (1m) b) Describe an experiment to test your hypothesis in 10 (a), based on the following criteria.

I) Aim of the experiment (1m) ii) Identification of variables (2m) iii) List of apparatus and variables (1m) iv) Procedure or method (3m) v) Tabulation of data (1m) vi) Conclusion (1m)

11. a) Steel is a type of alloy. State four differences between steel and iron. (4m)

Study the diagram above. Explain how you can build a concept regarding alloys based on the information above. Your explanation should include the following: i) Identification of two common characteristics. (2m) ii) Give one example of an alloy. (1m) iii) Give one example of a product which is not an alloy. (1m) iv) Construct the concept of an alloy. (2m)

12. a) Discuss how the following factors affect the calorie requirement of an individual: i) Physical activities ii) Age (3m) b) Most health problems are due to dietary habits. The diagram below shows some health problems faced by En Ali, an executive with a finance company.

Explain methods of overcoming his health problems

Your explanation should include the following aspects: i) Identification of the problem (1m) ii) Suggestion of two methods to solve the problem (4m) iii) Choose the best method and explain your choice (2m)

xxxxxxxxxxxxxxxxx Prepared by : Checked by : Verified by : …………………………… ……………………………………….. ……………………………………… (Datin Mary John) (Pn Tan Poh Lee) (Pn Loh Kwee Fong)

Mrs Lee had forgotten to put meat bought from the market in the refrigerator. The meat turns bad in the evening.

Alloy

Steel Pewter

Bronze Duralumin

Hypertension

Diabetes Obesity

Heart attack

Health problems