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Soalan Percubaan Pt3 Sains 2015

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Text of Soalan Percubaan Pt3 Sains 2015

1. (a)Changes of states of matter occur in daily life as shown in the situations given below. In the table below, tick ( ) to show whether each situation given occurs with the absorption of heat or the release of heat.Perubahan keadaan jirim berlaku dalam kehidupan harian seperti yang ditunjukkan dalam situasi yang diberi di bawah. Dalam jadual di bawah, tandakan ( ) sama ada situasi yang diberi menunjukkan haba diserap atau haba dibebaskan.

Situations that occur in daily life

Situasi yang berlaku dalam kehidupan harianAbsorption of heat

Haba diserapRelease of heat

Haba dibebaskan

(i) Production of salt from sea water

Penghasilan garam daripada air laut

(ii) Formation of water droplets on the outside of a glass of cold drink

Titisan air terbentuk di luar gelas berisi minuman sejuk

(iii) Keeping water in the freezer to make ice

Simpan air dalam penyejuk beku untuk menghasilkan ais

(iv) Melting of chocolate after it has been left for 24 hours

Coklat mencair selepas ditinggalkan di atas meja selama 24 jam

[ 4 marks / 4 markah](b)The diagram below shows the changes of state of matter.

Rajah di bawah menunjukkan perubahan keadaan jirim

State two physical processes which are involved in the change of state of matter shown in diagram above.

Nyatakan dua proses fizikan yang terlibat dalam perubahan keadaan jirim seperti ditunjukkan dalam rajah di atas.

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[2 marks / 2 markah]2. (a)The diagram below shows two processes, P an d Q in a green plant.Rajah di bawah menunjukkan dua proses, P dan Q dalam tumbuhan hijau

Based on the diagram shown above, name the processes labelled P and Q

Berdasarkan rajah di atas, namakan proses yang berlabel P dan Q

(i) P: __________________________________________________________________(ii) Q: __________________________________________________________________

[2 marks / 2 markah]

(b) The relationship between the process P and process Q can be seen in the diagram below

Hubungan antara proses P dengan Q dapat dilihat dalam rajah di bawah

State what will happen to the quantities of oxygen and carbon dioxide in the atmosphere if all the green plants are destroyed.Nyatakan apakah yang akan berlaku kepada kuantiti gas oksigen dan karbon dioksida dalam atmosfera sekiranya semua tumbuhan hijau temusnah?

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[2 marks / 2 markah](c)The diagram below shows a human activity. Human activities can have harmful effects on plants and animals

Rajah di bawah menunjukkan satu aktiviti manusia. Aktiviti manusia mungkin mempunyai kesan buruk pada tumbuh-tumbuhan dan haiwan.

State two harful effects of the human activity shown above on the natural environment

Nyatakan dua kesan buruk aktiviti manusia di atas terhadap alam semula jadi

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3. The diagram below shows the structure of the human earRajah di bawah menunjukkan struktur telinga manusia.

(a) Complete the following table by writing the correct part of human ear which performs each of the functions given.

Lengkapkan jadual di bawah dengan bahagian telinga manusia yang tepat untuk setiap fungsi yang diberiFunction

FungsiPart of the ear

Bahagian telinga

(i) Detects vibrations and converts the into nerve impulses

Mengenal pasti getaran dan menukarkannya menjadi impuls saraf

(ii) Vibrates when it receives sound waves

Bergetar apabila menerima gelombang bunyi

(iii) Amplify vibrations and transfer them to the oval window

Mnguatkan getaran dan menghantarnya ke tingkap bujur

[3 marks / 3 markah]

(b) Put a tick ( ) for a statement that is true and a cross ( ) for a statement that is falseTandakan ( ) bagi penyataan yang betul dan ( ) bagi pernyataan yang salah

(i)Any damage in cochlea is often temporary and can be treated medically.

Kerosakan pada koklea biasanya bersifat sementara dan boleh dirawat dengan menggunakan ubatan.

(ii)Semicircular canals and Eustachian tube do not play a part in hearing although both of them are in the ear.

Salur separuh bulat dan tiub Eustachio tidak memainkan peranan dalam pendengaran walaupun kedua-dua struktur ini berada dalam telinga.

(iii)The ear can be divided into three main parts, which is semicircular canals, ossicles and auditory canal. These three main parts are located in the outer ear that contains air.Telinga boleh dibahagikan kepada tiga bahagian utama, iaitu gegendang telinga, tulang osikel dan salur auditori. Tiga bahagian utama ini adalah struktur telingan yang terletak dibahagian telinga luar yang mengandungi udara.

[3 marks / 3 markah]4. A group of students conduct an experiment to study the composition of water. The diagram below shows the result obtained after 30 minutes.Sekumpulan murid menjalankan eksperimen untuk mengkaji komposisi air. Rajah di bawah menunjukkan keputusan yang diperoleh selepas 30 minit.

(a) Explain why the quantities of gas X and gas Y collected in the test tubes after 30 minutes are different.

Terangkan mengapa kuantiti gas X dan gas Y yang dikumpulkan di dalam tabung uji selepas 30 minit adalah berbeza.

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[2 marks / 2 markah]

(b) What is the purpose of adding dilute sulphuric acid to the water?

Apakah tujuan menambahkan asid sulfurik cair ke dalam air?

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[1 mark / 1 markah]

(c) Suggest a confirmatory test that the students can carry out to identify gas X and gas Y. Explain your suggestion.

Cadangkan ujian pengesahan yang boleh dilakukan oleh murid untuk mengenal pas gas X dan gas Y. Terangkan cadangan anda.

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[3 marks / 3 markah]5. The diagram below shows a student pulling a load of 40 kg on two different surfaces.Rajah di bawah menunjukkan seorang murid menarik beban 40 kg di atas dua permukaan yang berbeza

(a) Based on your observation, state the difference in friction faced by the student during the process of pulling the load in situation A and situation B.

Berdasarkan pemerhatian anda, nyatakan perbezaan geseran yang dihadapi oleh murid itu ketika proses menarik beban dalam situasi A dan situasi B.

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[1 mark / 1 markah]

(b) What inference can be made based on your answer in (a) ?

Apakah inferens yang dapat dibuat berdasarkan jawapan anda di (a) ?

________________________________________________________________________________________________________________________________________________________________________________________________________________________

[1 mark / 1 markah]

(c) Predict the friction faced by the student if the load is pulled on the surface of grass

Ramalkan geseran yang dihadapi oleh murid itu jika beban tersebut ditarik di atas permukaan rumput

________________________________________________________________________________________________________________________________________________________________________________________________________________________

[1 mark / 1 markah]

(d) Suggest three ways to reduce the frictional force in situation ACadangkan tiga cara untuk mengurangkan daya geseran dalam situasi A

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[3 marks / 3 markah]6. (a)A lever is a simple machine. Levers are classified into first-class levers, second-class le