PMR Mid Year 2007 SBP Science Paper 2

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SEKTOR SEKOLAH BERASRAMA PENUH

KEMENTERIAN PELAJARAN MALAYSIA

PEPERIKSAAN PERTENGAHAN TAHUN 2007

SAINS

Kertas 2

Satu jam tiga puluh minit

JANGAN BUKA KERTAS SOALAN INISEHINGGA DIBERITAHU

1. Tuliskannombor kad pengenalandanangka gilirananda pada ruang yang disediakan .

2. Kertas soalan ini adalah dalam Bahasa Inggeris .

3. Calon dikehendaki membaca maklumat di halaman 2.

Kertas soalan ini mengandungi 15 halaman bercetak

[Lihat sebelah

55/2 2007 Hak Cipta Sektor SBP

1

SULIT

55/2

Sains

Kertas 2

Mei

2007

1 jam

NO. KAD PENGENALAN

ANGKA GILIRAN

Kod Pemeriksa

Bahagian Soalan MarkahPenuh MarkahDiperolehi

A

1 5

2 7

3 6

4 7

5 8

6 7

B

7 8

8 12

Jumlah 60

Name :_______________________


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INFORMATION FOR CANDIDATES

1. This question paper consists oftwosections : Section A and

Section B.

2. Write your answers in the spaces provided in the question paper.

3. Show your working, it may help you to get marks.

4. If you wish to cancel any answer , neatly cross out the answer.

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

unless stated.

6. Marks allocated for each question or part question are shown in

brackets.

7. The time suggested to complete Section A is 60 minutes and

Section B

is 30 minutes.

8. You may use a non-programmablescientific calculator.

9. Hand in all your answer sheets at the end of the examination.

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Section A

( 40 marks )

Answerall questions.

The time suggested to complete this section is 60 minutes.

1. Figure 1 shows a plant cell.

FIGURE 1

a) Label structure P and Q in Figure 1 using the following words

Nucleus Vacuole Cell Wall

( 2 marks )

b) State the function of the structure:

i) P : _____________________________________________________

ii) Q : _____________________________________________________

( 2 marks )

c) Name two structures that are found in the plant cell but not found in ananimal cell.

i) __________________________________________

ii) __________________________________________

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( 1 mark )

2. Figure 2 shows an experiment to study the density of a substance.

FIGURE 2

a) Why do the wax and the sand stay at different level of water in

Figure 2?

i) Wax : __________________________________________________

ii) Sand : __________________________________________________

( 2 marks )

b) Based on Figure 2, arrange these substances in ascending order to their

densities.

.

( 1 mark )

c) The density of water is 1g/cm3 while the density of turpentine is 0.8g/cm3.

i) Predict what happens if a little turpentine is poured into the measuringcylinder in Figure 2.

____________________________________________________________

( 1 mark )

ii) Give a reason for your answer.

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____________________________________________________________

( 1 mark )

c) An egg sinks in the water. Suggest how we can make the egg float .Give a reason for your suggestion.

____________________________________________________________

____________________________________________________________

( 2 marks )

3. The Figure 3 below shows the apparatus used in an experiment to compare inhaleand exhale air.

FIGURE 3

a) What is meant by the term `exhale air?

___________________________________________________________

( 1 mark )

b) State the function of lime water in both boiling tubes above.

___________________________________________________________

( 1 mark )

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c) Which clip should be closed when air is blown into the apparatus above

through the rubber tubing? Why?

___________________________________________________________

( 1 mark )

d) From your observation, the lime water in which boiling tube turns more

cloudy? Give your reason.

__________________________________________________________

__________________________________________________________

( 2 marks )

e) State the conclusion of the experiment.

__________________________________________________________

( 1 mark )

4. Figure 4 shows the human digestive system.

FIGURE 4

a) i) Label any two of the following structures in Figure 4

( 2 marks )

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Liver Oesophagus Pancreas Stomach


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ii) Give one function of structure Q.

__________________________________________________________

( 1 mark )

b) A student carried out a food test on sample P.

Table 4 shows the result of the test.

Food Test Observation Food Class

Sample P is crushed andMillons Reagent is added

A red precipitate was formed

Sample P is tested

on filter paper

A greasy spot was formed

Table 4

i) Complete table 4 by naming the food class present in sample P.

( 2 marks )

ii) Explain what happens to food sample P while it is inside the structure Q

______________________________________________________________

______________________________________________________________( 2 marks )

iii) State what happens to the final product in b) (ii)

_______________________________________________________________

( 1 mark )

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5. Figure 5 shows a device that uses the principle of air pressure.

FIGURE 5

When the plunger is pushed inwards, a spray of fine insecticide droplets is

produced.

a) Mark the position of the higher and the lower pressure in Figure 5.

( 2 marks )

b) What happens to the air in the cylinder when the plunger is pushed inwards?

_____________________________________________________________

( 1 mark )

c) What happens to the air pressure at position X after the plunger is pushed

inwards?

_____________________________________________________________

( 1 mark )

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d) Why is the insecticide forced out from the insecticide container after the

plunger is pushed inwards?

____________________________________________________________

( 1 mark )

e) A small hole is made at position P,Q and R respectively. The hole at which

position will not stop the device from working normally?

________________________________________________________

( 1 mark )

f) Give two examples of devices that use the principle of air pressure.

i) _______________________________________________

ii) _______________________________________________

( 2 marks )

6. Figure 6 shows the set-up for an experiment to determine the action of heat on

acidic potassium dichromate (VI) solution.

FIGURE 6

a) i) Describe the colour change of the acidic potassium dichromate (VI)

solution.

_____________________________________________________

(1 mark )

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ii) Name the solution that can be used to substitute potassium

dichromate (VI) solution.

______________________________________________________

( 1 mark )

b) State the two elements found in the magnesium sulphide.

i) ______________________________________________

ii) ______________________________________________

( 2 marks )

c) Write the word equation for the reaction of heat on magnesium sulphide.

heat

+

( 1 mark )

a) Give one example of a chemical substance that can produce the same

gas as magnesium sulphide.

_______________________________________________________

( 1 mark )

b) Name the white residue produced.

________________________________________________________

( 1 mark )

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Section B (20 marks)

Instruction: Answer all questions.

The time suggested to complete this section is 30 minutes.

7. Figure 7 shows the arrangement of particles of substances P, Q and R.

P Q R

FIGURE 7

(a) Based on your observations in Figure 7, state the characteristics of each

substance.

P : _________________________________________________________

Q :_________________________________________________________

R : _________________________________________________________

( 3 marks )

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(b) Classify the matter P, Q and R based on the arrangement of particles of

substances.

Give an example for each group.

P,Q and R

Type of

Substances

Example

( 5 marks )

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8. Figure 8 shows an experiment to study the relationship between the extension

and the force on a spring. The readings of the pointer for the different weights areshown in table 8.

FIGURE 8

Weight (N) Pointer reading (cm) Extension of spring (cm)

0 30 0

0.1 32 2

0.2 34 4

0.3 36

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0.4 38

Table 8

(a) State the variables in the experiment.

Manipulated variables

Responding variables

Controlled variables

( 3 marks )

(b) From the data in table 8, calculate each extension of the spring for the weights

used. ( Fill in the table 8)

( 2 marks )

(c) Based on Table 8, plot a graph to show the relationship between the extension of

the spring and the weight.Extension of spring (cm)

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Weight

(N) (2marks)

(d) Based on the graph, what happens to the value of the springs extension when the

value of weight increases?

_________________________________________________________________

_

0

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_________________________________________________________________

_

( 1 mark )

(e) If the 60g weight is used, predict the extension of the spring.

_________________________________________________________________

_

( 1 mark )

(f) State the relationship between the extension of the spring and the weight.

_________________________________________________________________

_

_________________________________________________________________

_

( 1 mark )

(g) State one precaution in the experiment.

_________________________________________________________________

_

_________________________________________________________________

_

( 1 mark )

(h) Based on the experiment, what can you deduce from the meaning of the principle

of a spring balance?

__________________________________________________________________

__________________________________________________________________

( 1 mark )

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END OF QUESTION PAPER

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PMR Mid Year 2007 SBP Science Paper 2

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