NAMA:...................................................................... TING:.......................................

1511/2ScienceOktober

2013 2 ½ jam

SMK CONVENT LEBUH LIGHT PEPERIKSAAN AKHIR TAHUN

2013TINGKATAN EMPAT

ScienceKERTAS 2

Dua jam tiga puluh minit

JANGAN BUKA KERTAS SOALAN INI SEHINGGA DIBERITAHU

Instructions:

Disediakan oleh:

Pn. Ng Choon Lai

Disemak oleh:

Pn. Soon Saw Yew

Disahkan oleh:

En. Ooi Kim Hai

KERTAS SOALAN INI MENGANDUNGI 12 HALAMAN BERCETAK

1. This question paper consists of three sections: Section A, Section B and Section C.

2. Answer all questions in Section A and Section B. For Section C, answer Question 10 and either Question 11 or Question 12.

3. Write your answer clearly in the spaces provided in Section A and Section B. For Section C, answer your questions in the paper(s) given.

4. If you wish to change your answer, cross out the answer that you have done. Then write down the new answer.

5. The diagrams in the questions provided are not drawn to scale unless stated.

6. The marks allocated for each sub-part of a question are shown in brackets.

7. You may use a non-programmable scientific calculator.

8. The time suggested to answer Section A is 60 minutes, Section B is 50 minutes and Section C is 40 minutes.

Seksyen Nombor Markah1

A 23456

B 78910

C 1112

Jumlah

1

Section A(20 marks)

Answer all questions.

1.

Diagram 1

Diagram 1 shows the reflex arc of a reflex action

a. Name the parts labeled X, Y and Z. (3 Marks)

X: ……………………………………………………………………………………………………..

Y: …………………………………………………………………………………………………….

Z: ……………………………………………………………………………………………………..

b. Draw arrows in the diagram above to show the path of the impulse passing through the reflex arc.(1 Mark)

c. State the importance of reflex action? (1 Mark)

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

2

2. A student has collected data on the types of the blood groups of all the students in his class. The data is shown below.

a. Complete Table 1 based on the data shown above. (2 Marks)

Type of blood group A B O ABNumber of students

Table 1b. Draw a bar chart to represent the data in Table 1. (2 Marks)

c. Write a conclusion on the type of variation based on the graph in (b) (1 Mark)

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

3

3.

Diagram 2

Diagram 2 shows the set-up of the apparatus used in an experiment to study the reactivity of zinc with dilute hydrochloric acid.The volume of gas collected is recorded every minute up to six minutes. Table 2 shows the results of the experiment.Time ( min) 0 1 2 3 4 5 6Volume of gas collected ( cm ³ ) 0 15 30 41 42.5 43

Table 2

a. Based on Table 2, draw a graph of the volume of gas collected against time. (2 Marks)

b. Based on the graph in (a),

i. state the volume of gas collected ( cm ³ ) in the third minutes. (1 Mark)

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

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ii. State the relationship between the volume of gas collected and time in the first 2 minutes. (1 Mark)

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

iii. Predict the volume of gas collected in the eight minute. (1 Mark)

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

4.

Diagram 3

Diagram 3 shows the set-up of an experiment to compare the reactivity of metals with oxygen. Magnesium, zinc and copper powder are used in the experiment.

a. State one hypothesis for this experiment (1 Mark)

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

b. What is the purpose of heating potassium manganate (VII) in this experiment? (1 Mark)

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

c. State the variables in this experiment. (2 Marks)

i. Manipulated variable:………………………………………………………………………………

ii, Responding variable: ……………………………………………………………………………..

d. Using the terms such as very reactive, reactive and not reactive, compare the reactivity of magnesium, zinc and copper. (1 Mark)

Metal Magnesium Zinc CopperReactivity

5

Section B(30 marks)

Answer all questions

5.

Diagram 4

Diagram 4 shows the structure of the human brain. ai. Name the parts labelled K and L. (2 Marks)

K: ……………………………………………………………………………………………………

L: .……………………………………………………………………………………………………

ii. What will happen to the person if the part labelled P in his brain is injured? (1 Mark)

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

b. Which part of the brain controls

i. voluntary action? (1 Mark)

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

ii. involuntary action? (1 Mark)

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

c Why do P and L are highly folded (1 Mark)

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

6

6.

Diagram 5

Diagram 5 shows a cell undergoing cell division.

ai. Name the type of cell division shown in Diagram 5. (1 Mark)

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

ii. Where does this type of cell division occur in a female? (1 Mark)

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

iii. State the importance of the cell division stated in 5(a)(i). (1 Mark)

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

bi. During stage Y, the homologous chromosomes form in pairs near the equator and exchange genetic material. Name this process that occurs between the homologous chromosomes.

(1 Mark)………………………………………………………………………………………………………..

ii. What is the effect of the process stated in 5(b)(i) on a couple’s children? (1 Mark)

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

iii. How do the daughter cells produced differ from the parent cell? (1 Mark)

………………………………………………………………………………………………………..7

7.

Diagram 6

Diagram 6 shows an incomplete Periodic Table. C, D, E, F and G represent certain elements in the Periodic Table.

a. How are the elements in the Periodic Table arranged? (1 Mark)

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

b. What is the change from element C to element E? (1 Mark)

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

ci. What type of element is F? (1 Mark)

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

ii. Which element has the biggest proton number? (1 Mark)

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

d. Element D has an isotope with nucleon number 17 and proton number 8.

i. What is the number of electrons in the isotope? (1 Mark)

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

ii. How many neutrons are there in this isotope of element D? (1 Mark)

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

8

8.

Diagram 7

Diagram 7 shows the apparatus set-up for electroplating an iron key.

a. Name the material used as

i. the anode: ………………………………………………………………………………… (1 Mark)

ii. the cathode: ………………………………………………………………………………. (1 Mark)

b. What solution can be used as an electrolyte in this electroplating process? (1 Mark)

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

c. If an electric current flows for 30 minutes, state what happens to

i. the iron key (1 Mark)

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

ii. the copper plate (1 Mark)

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

d. Give one method to give an even coating. (1 Mark)

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

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9.

Diagram 8

Diagram 8 shows radioactive rays in the electric field.

a. Name the types of radiations labelled X, Y and Z. (3 Marks)

X : …………………………………………………………………………………………………….

Y: ……………………………………………………………………………………………………..

Z: ……………………………………………………………………………………………………..

b. Why is ray Y not deflected? (1 Mark)

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

c. Why is ray X deflected more than ray Z? (1 Mark)

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

d. What is the best method to prevent ray Y from being emitted to the environment? (1 Mark)

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

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Section C(20 marks)

Answer question 10 and either question 11 or question 12.

10. Study the following statement.

Metals and non-metals have different electrical conductivities

You are given two types of substances : copper and plastic.

a.. Suggest a hypothesis to investigate the above statement. (1 Mark)

b. Describe briefly a laboratory experiment to prove the above statement. Your description should include the following: i. aim of the experiment (1Mark) ii. identification of variables (2 Marks) iii. list of apparatus and materials (1Mark) iv. method of the experiment (3 Marks) v. tabulation of data (1 Mark) vi. conclusion (1 Mark)

11a. State four differences between chemical changes and physical changes. (4 Marks)

b. Diagram 9.1 shows two physical changes: freezing of water melting of ice

Diagram 9.1

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Diagram 9.2 shows the dissolving of salt and the evaporation of salt solution to form salt again.

Diagram 9.2

Study the information in Diagram 9.1 and 9.2 and construct the concept of physical change. Your answer should be based on the following steps:

i. identify the two common characteristics (2 Mark)ii. develop an initial concept (1 Mark)iii. give other example and non-example in relation to the concept (2 Marks)iv. state the actual concept of physical change (1 Mark)

12a. Name one radioactive substance and its use in the following fields:

i. medical (2 Marks)ii. agriculture (2 Marks)

b. Exposure to radioactive radiation causes both short-term and long-term sickness. Hence, proper handling of radioactive wastes is important. Diagram 10 shows two methods of handling radioactive wastes.

Diagram 10Explain the methods of handling different levels of radioactive wastes. Your explanation should include the following aspects:

i. identify the problem (1 Mark)ii. explain the types of radioactive wastes handled by each method (4 Marks)iii. choose the best method to handle radioactive wastes from nuclear reactor and explain your choice (1 Marks)

END OF QUESTION PAPER

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Answer- 2013 PAT_F4 _ Science_P2

Question Answer Mark(s)1a X: sensory neurone

Y: relay neuroneZ: motor neurone

111

b <— →

1

c To protect us from injury 1

2a 11,10,5,4 All correct-23 correct-1

b Correct bar with gap-1

Correct & labelled axis-1

c Discontinuous variation 1

3a Mark all the pts correctly—1M,A smooth curve---1M

bi 37.5 cm³/37/38 1ii The volume of gas collected increases with time 1iii 43 cm³/43.5 1

4a Metals which are very reactive will burn readily in oxygen while those that are less reactive will burn slowly or not at all

1

b To provide oxygen 1c i. types of metals ii. reactivity of metals with oxygen 1,1d Very reactive, reactive, not reactive 1

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5ai K: medulla oblongata L: cerebrum 1,1ii The person will not be able to maintain body posture/muscular

movement will be affected1

bi L 1ii K 1c To house more neurones 1

6ai meiosis 1 ii Ovaries/ovary 1iii To produce gametes 1bi Crossing-over 1ii The couple’s children will not appear identical 1iii The daughter cells have halve the number of chromosomes compared

to the parent cell1

7a The elements are arranged in the order of increasing proton number 1b Metal to non-metal 1ci Alkaline earth metal 1ii G 1di 8 1ii 9 1

8a i : copper ii : iron key 1,1b Copper(II) sulphate solution 1ci Coated with a layer of copper 1ii Becomes thinner 1d Use small current/ rotate the iron key 1

9a X: Beta Y: Gamma Z: Alpha 1,1,1b Y is neutral ( no charge) 1c The mass of the particles in X is less than in Z 1d. Keep in thick lead container 1

10a Metals will conduct electricity whilst non-metals will not conduct electricity

1

bi To investigate the electrical conductivity of metals and non-metals 1ii Manipulated: type of substance

Responding: ability to conduct electricityConstant: the mass of the substances

3 correct---2M,2 correct----1M

iii Copper and plastic strips, battery, ammeter, connecting wires, crocodile clips

1

iv

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1. the apparatus is set up as shown in the diagram above2. a copper strip is connected by using crocodile clips3. the ammeter is observed to see if there is a reading4. the experiment is repeated by using plastic strip

111

vType of substance Ability to conduct electricitycopperplastic

1

vi Copper can conduct electricity but plastic cannot conduct electricity 1

11a Chemical change Differences Physical changeRequired Energy requirement Less requiredChanges Mass of substance No changeFormed Formation of new

substanceNot formed

Changes Chemical properties and composition of substance

No change

11

1

1

bi no new substances are formed changes in physical forms only

11

ii A change which has no new substances formed and involved changes in physical forms only is physical change

1

iii Another example: boiling of waterNon-example: burning of paper

11

iv Physical change is a change which has no new substances formed and involved changes in physical forms only

1

12aField Radioactive

substanceUse

Medicine Cobalt-60 To kill cancer cellsAgriculture Phosphorus-32 To detect absorption

of fertiliser by plants

1,1

1,1bi Radioactive wastes are not highly active but continue to emit invisible

radiations that are harmful to human1

ii Forceps is used to handle low-level radioactive wastesRobotic arm is used to handle high-level radioactive wastes

1,11,1

iii Robotic arm because the radioactive wastes are still highly radioactive 1

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