Berita Harian : 2019-09-11

Fizik (kertas 2) : 31 : 5

Fizik (kertas 2)

BIL 834 Rabu, 11 September 2019 Fizik (Kertas 2) SKOR 5 Dari muka 4 → 4 5 Diagram 3.1 shows a cathode ray tube. 3.1 Diagram 4.1 shows two identical metal balls heated for a few minutes in boiling water. The two metal balls are then transferre­d into two beakers containing liquid X and liquid Y. Diagram 4.2 and 4.3 shows the initial and final readings of thermomete­rs in liquid X and liquid Y. 4.1 Rajah menunjukka­n satu tiub sinar katod. Cathode Vacuum tube Rajah menunjukka­n dua biji bebola logam yang serupa dipanaskan selama beberapa minit di dalam air mendidih. Dua biji bebola logam itu kemudian dipindahka­n serentak ke dalam dua buah bikar yang mengandung­i cecair dan cecair Rajah dan menunjukka­n bacaan awal dan bacaan akhir termometer di dalam cecair dan cecair Tiub vakum Katod Switch Anode Suis Anod X Y. X 4.2 Y. 4.3 Low voltage supply Bekalan voltan rendah Boiling water Initial reading Final reading Initial reading Final reading Filament Air mendidih Bacaan awal Bacaan akhir Bacaan awal Bacaan akhir Filamen 25 °C 40 °C 25 °C 30 °C Extra High Tension (E.H.T) (V.L.T) Voltan Lampau Tinggi Diagram 3.1 / 3.1 Rajah When the switch is closed, the filament is heated and the electrons on the surface of cathode are released. Heat Liquid X X Liquid Y Y Haba Apabila suis ditutup, filamen dipanaskan dan elektron pada permukaan katod dibebaskan. Cecair Cecair Diagram 4.1 / 4.1 Diagram 4.2 4.2 Diagram 4.3 4.3 Rajah / Rajah / Rajah (a) (i) Name the process that releases the electrons. Namakan proses yang membebaska­n elektron. Table 2 shows the mass and specific heat capacity of the liquid X and liquid Y. 2 X Y. Jadual menunjukka­n jisim dan muatan haba tentu cecair dan cecair ________________________________________________ [1 mark / 1 markah] Liquid Mass / g Specific heat capacity / Jkg-1 °C-1 / Jkg-1 °C-1 Rise in liquid temperatur­e / °C / °C Cecair Jisim / g Muatan haba tentu Kenaikan suhu cecair (ii) State the energy change experience­d by the electrons after they leaves the cathode. Nyatakan perubahan tenaga yang dialami oleh elektron selepas meninggalk­an katod. X 300 2 100 ________________________________________________ [1 mark / 1 markah] Y 300 4 200 ( b) An extra high tension of 5 000 V is applied between the cathode and anode. 5000V Table 2 / 2 Jadual Satu voltan lampau tinggi dikenakan di antara katod dengan anod. ( a) What is the meaning of specific heat capacity? (i) Give reason why an extra high voltage of 5 000 V is applied between cathode and anode. 5000V Apakah maksud muatan haba tentu? Berikan sebab mengapa voltan lampau tinggi dikenakan di antara katod dengan anod. ___________________________________________________ [1 mark / 1 ________________________________________________ [1 mark / 1 markah] markah] ( b) Complete Table 2 with the rise in temperatur­e of liquid. 2 (ii) Draw the electron flow as it leaves the cathode in Diagram 3.2. 3.2. Lengkapkan Jadual dengan kenaikan suhu cecair. Lukis aliran elektron selepas meninggalk­an katod pada Rajah [1 mark / 1 markah] Cathode / Katod ( c) Based on Diagram 4.2, Diagram 4.3 and Table 2, 4.2, 4.3 2, Switch / Suis Berdasarka­n Rajah Rajah dan Jadual (i) compare the specific heat capacity of liquid X and liquid Y. X Y. bandingkan muatan haba tentu cecair dan cecair E.H.T / V.L.T ________________________________________________ [1 mark / 1 markah] Diagram 3.2 / 3.2 Rajah (ii) compare the final readings of the thermomete­rs in liquid X and liquid Y. X Y. (c) Diagram 3.3 shows the trace formed on the screen of cathode ray oscillosco­pe, C.R.O. 3.3 O.S.K. bandingkan bacaan akhir termometer di dalam cecair dan cecair Rajah menunjukka­n surih yang terbentuk pada skrin osiloskop sinar katod, ________________________________________________ [1 mark / 1 markah] (iii) compare the rise in temperatur­e of liquid X and liquid Y. X Y. bandingkan kenaikan suhu bagi cecair dan cecair 4 0.02 ________________________________________________ [1 mark / 1 s/div V/div markah] Diagram 3.3 / 3.3 Rajah (i) The Y-gain from the C.R.O is set at 4 V / division. Calculate the peak voltage of the a.c. supply. O.S.K. 4V (iv) state the relationsh­ip between the specific heat capacity with the rise in temperatur­e of the liquid. Gandaan-y bagi dilaraskan pada Hitung voltan puncak bekalan a.u. tersebut. / bahagian. nyatakan hubungan antara muatan haba tentu dengan kenaikan suhu cecair. ________________________________________________ [1 mark / 1 [2 marks / 2 markah] markah] (ii) Draw the new trace on the screen in Diagram 3.4 when the time base is set at 0.01s / division and the Y-gain at 2 V / division. ( d) (i) Which liquid is more suitable to be used as a coolant in the cooling system of a car? Cecair yang manakah lebih sesuai digunakan sebagai agen penyejuk dalam sistem penyejukan sebuah kereta? Lukis surih yang baharu pada skrin dalam Rajah 3.4 apabila dasar masa dilaraskan pada / bahagian dan gandaan-y adalah / bahagian. 0.01s 2V ________________________________________________ [1 mark / 1 markah] one satu 5(d)(i). 5(d)(i). (ii) Give reason for the answer in Berikan sebab bagi jawapan di 0.01 2 ________________________________________________ [1 mark / 1 s/div V/div markah] Diagram 3.4 / 3.4 Rajah Lihat muka 6 → [2 marks / 2 markah]

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