SEC B 2011 (1)

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VARIABLES

WHAT TO CHANGE ( WTC )

WHAT TO MEASURE / OBSERVE ( WTM / WTO )

WHAT TO KEEP THE SAME ( WTS )

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Saiz . Ketebalan .. Bentuk .

Panjang . Isipadu .

Ketinggian .. Kuantiti

Jisim . Suhu .

Jenis .. Jarak .. Month

Bilangan . Year

Jumlah .. Kecerahan Time

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1. Rajah di bawah menunjukkan satu aktiviti

A carpenter uses a saw to saw three wooden plank of thesame width and length but of different thickness. Table

below shows the time taken by the carpenter to saw thethree wooden planks.

Wooden plank Time taken to saw (min)

A 2B 4

C 6

WTC WTM

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What to change

( WTC )

What to measure( WTM )

What to keep thesame ( WTS )

Thickness ofwooden plank

Time taken tosaw the wooden

plank

Width of woodenplank

length of woodenplank

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2. Diagram below shows three children are sitting on threeswings that are of different length.

When the three children swung, they found that the speed ofthe swing is different from each other. The result arerecorded into table below.

Swing A B C

The speed of the swing Faster Fast Slow

WTC

WTM

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What to change

( WTC )



Length of swing

The speed of theswing

Weight ofchildren

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3. Diagram below shows an experiment.

Three test tube of different length are being stuck with astopper. Then they are heated for 10 minutes. The result arerecorded into the table below.

Test tube The time taken for the stopper toshoot out (min)

A 1

B 2

C 3

WTC WTM

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What to change

( WTC )



Length of testtube

Time taken forthe stopper toshoot out

The size offire

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4. Diagram below shows a man travels on an uneven roadwhich is 15 km long with three cars of different size of tires.

Table below shows the time taken for the cars to arrive at itsdestination.

Car Time taken to arrive min)

A 30B 20

C 10

WTC WTM

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What to change

( WTC )



Size of tires

Time taken toarrive

Distancetravel

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REASONS /INFERENCES

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1. Ajeet carried out an investigation to test the ability of anumber of objects to light up a bulb. Ajeet prepared thefollowing circuit. Each object was connected to the circuit.

(a) Using Ajeets results, state two reasons about thedifferences between objects in group P and group Q.

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Observation :

Object in group P does not light up the bulb,object in group Q light up the bulb.

Reasons :

1. Object P is an insulator and Q is aconductor.

Objek P bahan penebat, objek Q bahankonduktor

2. Object P cannot conduct electricity and Qconduct electricity.

Objek P tidak mengalirkan arus elektrik,

objek Q mengalirkan arus elektrik

WHY

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2. Siti has two rubber bands, X and Y. X and Y are of thesame length. She carries out an investigation using therubber bands. Each rubber band is hung with an identicalcup. Diagram below shows the results of the investigation.

(a) State two inferences about the length of rubber band Y.

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Observation :

Rubber band Y longer than rubber band X.

WHY

Reasons :

1. Rubber band Y more elastic than rubber bandX.

Gelang getah Y lebih kenyal berbanding X

2. Rubber band Y soft than rubber band X.

Gelang getah Y lebih lembut berbanding X.

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3. A pupil released toy car X down an inclined ramp. Thisactivity is repeated with toy car Y. Distance traveled by bothcars is recorded.

Table below shows the result of the investigation.

Toy car Distance traveled ( m )XY

12

(a) State two inferences that might explain why each toy

car travels a different distance.

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Observation :

Toy car Y travel further than toy car X.

Reasons :

1.Toy car Y heavier than toy car X.

Kereta mainan Y lebih berat berbanding X .

2. Toy car Y have bigger tires than toy carX.

Kereta mainan Y tayar lebih besar

berbanding X

WHY

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4. A group of students gathered information about theextinction of animal species in a particular forest. The barchart below shows the information obtained by the pupils.

(a) State two inferences to explain why the number of extinctanimals in year 2000 is the highest.

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Observation :

The number of extinct animals in year2000 is the highest.

Reasons :

1. Burning of forest

Pembakaran hutan

2. Construction of industrial area

Pembinaan kawasan perindustrian .

WHY

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CONCLUSION

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1. Table below shows information gathered by apupil in an investigation.

(a) State one conclusion that can be made frominformation in table above.

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What to change :

Date / day

Hari

What to measure :

Phase of the Moon

Fasa Bulan

Phase of the Moon largest on the 15 th day

Pada 15hb fasa bulan paling besarberbanding tarikh yang lain.

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2. In an experiment a pupil uses several paperclips and a magnet. The magnet is labeled at threedifferent position P, Q and R. Diagram below

shows the result of the experiment.

(a) What conclusion can be made from theexperiment?

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What to change :

Part of magnetBahagian magnet

What to measure :

Number of paperclips attracted

Bilangan klip kertas

dapat ditarik

The center of magnet is the least

number of paper clips attracted.Bahagian tengah magnet paling sedikit bilangan klip kertas dapatditarik.

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What to change :

Day

Hari

What to measure :

Size of the phasesof the Moon

Saiz fasa Bulan

At day 15 th size phases of the Moon isthe biggest.

Pada 15hb saiz fasa bulan paling besarberbanding hari yang lain.

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RELATIONSHIP BETWEEN 2VARIABLES

( 2 INFORMATION GATHERED )

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WTM BERGANTUNG WTC

WTM DIPENGARUHI WTC

WTC MEMPENGARUHI WTM

WTC MEMBERI KESAN WTM

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The time taken to evaporate depends on the surroundingtemperature.

Masa untuk penyejatan BERGANTUNG kepada suhu persekitaran.

WTC Surrounding temperature

WTM The time taken to evaporate

WTC

WTM

Trend

Trend

Surrounding temperature

The time taken to evaporate

increase

decrease

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Time taken by the sugar to dissolve affected by the mass ofsugar.

Masa untuk gula larut DIPENGARUHI oleh berat gula.

WTC

WTM

Mass of sugar

Time taken by the sugar to dissolve

WTC

WTM

Trend

Trend

Mass of sugar

Time taken by the sugar to

dissolve

increase

increase

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Time taken to boil affected by the volume of water.

Masa untuk mendidih DIPENGARUHI oleh isipadu air.

WTC

WTM

Volume of water

Time taken to boil

WTC

WTM

Trend

Trend

Volume of water

Time taken to boil

increase

increase

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Elongation of rubber band also depends on mass of weight .Pemanjangan gelang getah BERGANTUNG kepada beratbeban.

WTC

WTM

Mass of weight

Elongation of rubber band

WTC

WTM

Trend

Trend

Mass of weight

Elongation of rubber band

increase

increase

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Surrounding temperature influence the time taken to spoiltthe food.

Suhu persekitaran MEMPENGARUHI masa untuk makanan

menjadi rosak.

WTC

WTM


Time taken to spoilt the food

WTC

WTM

Trend

Trend


Time taken to spoilt the food

increase

increase

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The amount of pest presence in the farm affects theproduct of the farm .

Jumlah kehadiran serangga di ladang MEMPENGARUHI

hasil ladang.

WTC

WTM

The amount of pest presence in the farm

The product of the farm

WTC

WTM

Trend

Trend

The amount of pest presence in

the farm

The product of the farm

increase

decrease

SEC B 2011 (1)

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