SEKOLAH MENENGAH KEBANGSAAN SERI ROMPIN26810 KUALA ROMPIN, PAHANG

PEPERIKSAAN UPT 2 2006

TINGKATAN ENAM

FIZIKKERTAS 1

Satu jam Empat puluh minit

JANGAN BUKA KERTAS SOALAN INI SEHINGGA DIBERITAHU

1. Kertas soalan ini mengandungi 50 soalan.

2. Jawab semua soalan.

3. Rajah yang mengiringi masalah dalam kertas ini dimaksudkan untuk memberi maklumat yang berguna bagi menyelesaikan masalah. Rajah tidak semestinya dilukiskan mengikut skala.

4. Tiap-tiap soalan diikuti oleh empat pilihan jawapan berhuruf A, B, C dan D. Bagi tiap-tiap soalan pilih satu jawapan sahaja. Tandakan semua jawapan anda pada kertas jawapan objektif yang disediakan.

5. Fikir dengan teliti ketika memilih jawapan. Jika anda hendak menukar sesuatu jawapan, padamkan hingga bersih tanda yang telah dibuat itu. Kemudian hitamkan jawapan anda yang baru.

6. Penggunaan kalkulatorsaintifik yang tidak boleh diprogramkan adalah dibenarkan.

Tiap-tiap soalan diikuti oleh sama ada tiga , empat atau lima pilihan jawapan. Pilih satu jawapan yang terbaik bagi setiap soalan dan hitamkan ruangan yang betul pada kertas jawapan anda.

SULITFIZIKKERTAS 1MEI 20061 ¾ JAM

Answer all questions.1.What is the number of atoms in one cubic metre of an ideal gas at temperature 270C and pressure 4.0 X 105 Pa?

A 4.4 X 1022 m-3 B 6.4 X 1023 m-3

C 8.7 X 10 24m-3

D 9.7 X 1025m-3

2. The average kinetic energy for molecules of an ideal gas in a close rigid container is increased by factor of 4. What will happen to the pressure of the gas?

A It is constantB It is increased by a factor of 2C It is increased by a factor of 4 D It is increased by a factor of 8

3. Argon and neon are monoatomic gases with relative atomic mass 40 and 2 espectively. The ratio number of atoms in one mole of argon is number of atoms in one mole of neon

A always 2B 2 only if the two gases are at the

same temperature and pressure.C 2 only if the gases are at the temperatures of solidification.D always 1

4. According to the kinetic theory of gases, the internal energy for an ideal gas is the best defined as

A the average kinetic energy of the gas molecules.

B the total kinetic energy of the gas molecules.

C the most probable kinetic energy of the gas molecules.

D the total potential energy and kinetic energy of the gas molecules.

5. A diatom ideal gas molecule has translational kinetic energy and rotational kinetic energy at temperature 2270C. The average kinetic energy of the molecule is

A 2.07 X 10-20 JB 1.73 X 10-20 JC 1.73 X 10-20 J D 7.83 X 10-21 J

6. The effective degrees of freedom for an oxygen gas molecule at room temperature is

A 3 B 4C 5 D 6

7. For a diatomic gas at temperature T, each degree of freedom has an average energy of

A ½ kT B 2/3 kTC kT D 3/2 Kt

8. Nitrogen gas is diatomic and has translational motion as well as rotational motion at room temperature. At a very low temperature, such as 30 K, the number of degrees of freedom of the gas molecules is

A 0 B 1C 3 D 5

9. The figure below shows the relationship between the average translational kinetic energy Ek of a monotomic molecule of an ideal gas at absolute temperature T.

Ek

b

a

The value of Boltzmann constant that can be deduced from the graph above is

A a / b B a / 3bC 2a / b D 2a / 3b

10. One of the assumptions concerning an ideal gas isA kinetic energy is lost when collisions occur among the gas molecules.B gas molecules attract one another.C each molecule moves with root mean square speed.D the time of collision of the gas molecules can be neglected.

T

11. If the average kinetic energy per molecule for a diatomic ideal gas is equivalent to 0.1 eV, what is the temperature of the gas?

A 387 K B 464 KC 773 K D 1160 K

12. The equation W = ρ ( V2 – V1 ) represents the work done by the gas in

A free expansionB isothermal expansionC adiabatic expansionD expansion at constant pressure

13. An ideal gas in a cylinder is compressed isothermally from volume V1 and pressure ρ1 to volume V2 and pressure ρ2. Which of the following statement is correct concerning the gas?

A Heat is dissipated from the gas.B Kinetic energy of the gas increase.C Potential energy of the gas

increase.D No work done by the gas.

14. A mole of ideal gas is compressed isothermally at temperature 40 K from volume V to volume ¼ V. What is the work done on the gas?

A 2.0 kJ B 3.3 kJ C 4.2 kJ D 4.6 kJ

15. What is the work done when two moles of an ideal gas is compressed from 6 dm3 to 4 dm3 at constant temperature 400 K?

A 0.6kJ B 1.2 kJC 2.7 kJ D 3.3 kJ

16. The first law of thermodynamics states thatA no heat enters or leaves the system.B the increase in internal energy does not depend on volume or temperature of the system.C the increase in internal energy is equal to the work done by the system.D heat supplied is equal to the sum of the increase in internal energy and the work done by the system.

17. A monoatomic ideal gas that has volume V at initial pressure ρ expands adiabatically until its pressure becomes ρ/32. What is the new volume of the gas?

A 4V B 8VC 16 V D 32V

18. The internal energy U for a monoatomic ideal gas which has volume V at pressure ρ can be expressed as

A 5/2 ρV B 3/2 ρVC ρV D ½ ρV

19. The molar heat capacity at constant pressure Cp for a diatomic gas is

A 29.1 mol-1 K-1

B 20.8 mol-1 K-1

C 14.1 mol-1 K-1

D 12.5 mol-1 K-1

20. Which of the following quantities will decrease when an ideal gas in a closed cylinder is compressed adiabatically?

A Number of molecules per unit volumeB Frequency of molecular collisions of gasC Most probable speed of the gas molecules.D Mean time of intermolecular collision.

21. The figure below shows isotherms for a fixed mass of an ideal at different thermodynamic temperature T1 and T2.

ρV

3x T 2

T1

x

T

If T1 is the ice point, then the value T2 isA 91.05 K B 364.20 KC 364.21 K D 819.45 K

22. Which of the following equations cannot be used in adiabatic process of an ideal gas?

A dQ = 0B ρV = RTC ρV = constantD TVγ – 1 = constant

23. Which of the following is true concerning the adiabatic expansion of an ideal gas?A The temperature of the gas does not change.B The internal energy of the gas increase.C The r.m.s speed of the gas molecule decreases.D The external work done is more than the change of the internal energy.

24. The charge on a charged particle X and an alpha particle are 1.52 X 10-17C and 3.21X10 -19C respectively. What is the electrostatic force between the two particles by a distance of 1.00 x 10-10m? ( 1 / 4πε0 = 9 x 109Nm2C-2)

A 1.30 x 10 -6 NB 2.20 x 10-6 NC 3.10 x 10 -6 ND 4.38 x 10 -6 N

25. A charge of 5 C is moved from infinity to point X in a electric field. The work done to move the charge is 20 J. The electric potential at point X is

A 0.25 V B 4 VC 15 V D 25 V

26. An oil drop with charge q is stationary in a vertical electric field E. What is the mass of the oil drop? [ g is the acceleration due to gravity].

A qE B q / EC g / qE D qE / g

27. The electrostatic force between two point charges separated by a distance z is F. If the charges are separated by a distance 3z, the electrostatic force between the two charges will become

A F / 27 B F / 9C F / 3 D 3F

28. Three point charges -1μC, + 2μC and + 3μC are placed on a straight line as shown in the figure below.

R 2 cm S 3 cm T

-1μC + 2μC + 3μC

The resultant force acting on S due to R and T is

A 11 N towards TB 15 N towards TC 15 N towards RD 105 N towards R

29. Two parallel metal plates, each of area 0.40 m2, have opposite charges of the same magnitude on the inner surface of the plates. If the electric field between the plates is uniform and equal to 55 NC-1, what is the magnitude of the charge on each plate?

A 1.22 x 10-9C B7.80 x 10-10CC 3.90 x 1010C D1.95x 10 10C

30. Two capacitors of 2 μF and 4μF that are not charged are connected in series with a 12 V battery. What is the potential difference across the 2μF capacitor?

A 2 V B 4 VC 6 V D 8 V

31. Two capacitors with capacitance of 4μF and 6μF are connected in parallel. The arrangement is later connected in series with a third capacitor to produce an effective capacitance of 5μF. The capacitance for the third capacitor is

A 3 μF B 5 μFC 7 μF D 10 μF

32. A capacitor has capacitance of 2μF. To obtain an effective capacitance of 1μF, the capacitor needs to be connected to

A a capacitor of 2μF in seriesB a capacitor of 2μF in parallelC a capacitor of 1μF in parallelD a capacitor of 0.5μF in series.

33. Three capacitors C1, C2 and C3 with capacitance of 3μF, 2μF and 4μF respectively are connected to a 3V supply as shown in the figure below. What is the charge on the plates of each capacitor?

3 V

Charge C1 Charge C2 Charge C3

A 1 μF 2 μF 2 μFB 6 μF 2 μF 4 μFC 9 μF 18 μF 12 μFD 2 μF 8 μF 4 μF

34. Two capacitor X and Y with capacitance C and 2C respectively are connected in series with a battery. Which of the following statements is true of the two capacitors?

A The equivalent capacitance is 3C.B The charge of the capacitor Y is twice the charge of the capacitor X.C The potential difference across the capacitor X is twice the potential difference of the capacitor Y.D The energy stored in capacitor Y is twice the energy stored in capacitor X.

35. A capacitor of 160μF capacitance is charged so that the potential difference across it is 200 V. The capacitor is later discharged through a discharge tube so that the potential difference across the capacitor is reduced to 100 V. The energy dissipated through the tube is

A 1.2 J B 2.4 JC 3.6 J D 4.8 J

36. A capacitor of 5μF and a capacitor 10μF are connected in series with a 12V battery. What is the charge of each capacitor?

5μF 10μFA 10μF 20μFB 20μF 40μFC 40μF 20μFD 40μF 40μF

37. Which of the following products has the same unit as time?

A Resistance x capacitanceB Pressure x volumeC Frequency x wavelengthD Current x potential difference

38. The dimension for Planck constant h are

A ML2T-2

B ML2T-1

C MLT2

D MLT-1

39. A progressive wave is represented by the equation y = 0.20 sin [ 100πt – πx /2], with x and y are measured in metres and t in seconds. What is the speed of the wave?

A 20 ms-1 B 50 ms-1

C 100 ms-1 D 200 ms-1

40. What is the velocity of a wave represented by the equation y = 8 sin [ 4t – 5x], with x and y measured in centimetres and t in seconds?

A 4.0 cms-1 B 2.0 cms-1

C 1.6 cms-1 D 0.8 cms-1

41. A progressive wave is represented by the equation y = 0.4 cos 2π [ 0.5t – 0.1x ], with x and y in metres and t in seconds. What is the speed of the wave?

A 0.2 ms-1 B 0.5 ms-1

C 2.0 ms-1 D 5.0 ms-1

C 1 C 2

C 3

42. Which of the following relationships represents correctly the variation of the wave intensity I with distance r from a point source which produces spherical wave?

A I = constant B I α rC I α r2 D I α 1/r2

43. Which of the following statements concerning the progressive wave is true?A The progressive wave transmits energy from its source to the surroundings.B The progressive wave only refers to transverse wave.C All consecutive points are in phase.D The higher the frequency, the further will be the wave propagated from its source.

44. A pipe, open at both ends, has a fundamental frequency of 5.5 kHz. If the speed of sound in air is 330 ms-1, what is the effective length of the pipe?

A 2 cm B 3 cmC 5 cm D 7 cm

45. Sound intensity is directly proportional toA the amplitude of vibrations.B the square of the amplitude of vibrations.C the frequency of vibrations.D the square of the frequency of vibrations.

46. A bullet with a mass of 10 g is shot from a gun of mass 2 kg with a velocity of 400 ms-1. If the gun is placed on a smooth platform, what is the velocity of recoil of the gun?

A -2 ms-1 B 2 ms-1

C -4 ms-1 D 4 ms-1

47. A ball is thrown horizontally with a speed of 8 ms-1 from the top of a tall building. The ball takes 4 seconds to reach the ground. What is the range traveled by the ball?

A 20 mB 24 mC 26 mD 32 m

48. A lorry of mass 4000 kg is moving with a velocity of 72 km per hour and collides with a stationary car of mass 1000 kg. What is the total kinetic energy of the lorry and the car if the two vehicles were to be stuck together after the collision?

A 2.0 x 105 J B 5.1 x 105 JC 6.4 x 105 JD 8.0 x 105 J

49. When an object moves with constant speed round a circular track, which of the following quantities changes with time?

A Moment of inertiaB Linear momentumC Angular momentumD Angular velocity

50. What is the SI unit for gravitational field strength?

A ms-1

B N kg-2

C kg N-1

D N kg

SEKOLAH MENENGAH KEBANGSAAN SERI ROMPIN26810 KUALA ROMPIN, PAHANG

PEPERIKSAAN UPT 2 2006

TINGKATAN ENAM

FIZIK

KERTAS 2Dua jam Tiga puluh minit

JANGAN BUKA KERTAS SOALAN INI SEHINGGA DIBERITAHU

1. Kertas soalan ini mengandungi Dua bahagian iaitu Bahagian A dan Bahagian B.

2. Jawab semua soalan dalam Bahagian A dan Bahagian B.

3. Rajah yang mengiringi masalah dalam kertas ini dimaksudkan untuk memberi maklumat yang berguna bagi menyelesaikan masalah. Rajah tidak semestinya dilukiskan mengikut skala.

4. Jawapan hendaklah ditulis di kertas. Anda diminta menjawab dengan lebih terperinci

Jawapan mestilah jelas dan logik. Persamaan, gambar rajah, jadual, graf dan cara lain yang

sesuai untuk menjelaskan jawapan anda boleh digunakan. Rajah yang mengiringi soalan tidak

dilukiskan mengikut skala kecuali dinyatakan. Markah yang diperuntukkan bagi setiap soalan

atau ceraian soalan ditunjukkan dalam kurungan.

6. Penggunaan kalkulatorsaintifik yang tidak boleh diprogramkan adalah dibenarkan.

SULITFIZIKKERTAS 2MEI 20062½JAM

SECTION A ( 60 Mark)

Answer all questions in this section

13 cm 13 cm

10 cm Figure 1

1.Two small light balls, each of mass 2.0 g and carrying equal amount of like charge, are suspended freely by light non-conducting strings. The length of each string is 13 cm. The balls are in static equilibrium and separated by a distance of 10 cm, as shown in figure 1.

a) Draw a free body diagram to show all the external forces that act on one ball.b) Determine the charge carried by each ball.

Dua bola bersalut logam, setiap satunya berjisim 2 g, yang digantungkan di hujung tali sepanjang 13 cm yang dilekatkan di syiling. Cas-cas yang sama diletakkan di kedua- dua bola itu dan ia mencapai keadaan keseimbangan apabila terpisah sejauh 10 cm seperti rajah 1.

a) Lukiskan rajah daya-daya yang bertindak ke atas setiap bola.b) Kirakan cas pada setiap bola itu.

( 5 mark )

2. Q1 Q2

3 cm

Q4 Q3

4 cm

Figure 2

Point charges Q1 = + 20μF, Q2 = -15μF, Q3 = + 15μF and Q4 = + 10μF are placed at the corners of a rectangle, as shown in figure 2. Determine the resultant electric force that acts on Q4.

Cas-cas titik Q1 = + 20 μF, Q2 = - 15 μF, Q3 = + 15 μF dan Q4 = + 10 μF disusun seperti rajah 2. Kirakan jumlah daya elektrik yang bertindak pada cas Q4.

(10 mark)3. A particle of mass 2.0 x 10-5 kg carries a charge of -30μC. It moves with constant

θ

acceleration of 1.5 km s-2 in a uniform electric field. Determine the magnitude of the electric field strength of the field.

Satu zarah mempunyai cas – 30 μC dan jisim 2.0 x 10-5. Ia bergerak dengan pecutan seragam 1.5 kms-2 dalam medan elektrik seragam. Kirakan magnitud keamatan elektrik medan itu. ( 5 mark )

4. Assuming that a nucleus of 92238U can be considered to be a charged sphere of radius

7 x 10 -15 m, estimate the electric field strength on the surface of the nuclear sphere. ( Electron charge = - 1.6 x 10 -19 C ) Nukleus 92

238 U yang boleh dianggap berbentuk sfera, mempunyai jejari lebih kurang 7 x 10-15m. Berapakah medan elektrik pada permukaan nukleus itu? ( Cas elektron = -1.6 x 10-19 C )

( 5 mark )

5. - 10μC + 15μCA B

10 cm

10 cm

D C - 15μC +10μC

Figure 3

Point charges are placed at the corners of a square, as shown in figure 3. Determine the resultant electric field strength at the centre of the square.

Cas-cas titik diletakkan di penjuru-penjuru segiempat sama ABCD seperti dalam rajah 3. Cari keamatan elektrik di pusat segiempat sama itu. ( 10 mark )

6. A point charge of + 0.50μC moves from point A to point B in an electric field. The work done by the field is 10μJ. Determine the electric potential difference crossed by the charge. Cas titik + 5.0 μC digerakkan perlahan-lahan dari titik A ke titik B dalam medan elektrik. Kerja yang dilakukan oleh medan itu ialah 10μJ. Kirakan beza keupayaan elektrik (VB – VA) merentasi A dan B.

( 5 mark )

7. A parallel plate capacitor consists of pair plates which are separated by a thin piece of paper of thickness 0.050 mm. The surface area of each plate is 0.20 m2. Determine the capacitance of the capacitor. ( For the material of the paper, εr = 2.5, ε0 = 8.85 x 10-12 Fm-1 )

Satu kapasitor terbentuk daripada dua plat logam, setiap plat yang berluas 0.20 m2. Plat- plat itu dipisahkan oleh sekeping kertas yang bertebal 0.050 mm. Kirakan kapasitans bagi kapasitor itu.( Ketelusan relatif kertas εr = 2.5, ε0 = 8.85 x 10-12 Fm-1) ( 5 mark )

8. 2µF 4µF 5µF

3µF

12VFigure 4

Refer to the circuit shown in figure 4. Determine a) the charge stored in each capacitorb) the potential differences each capacitor

Rujuk litar dalam rajah 4, kirakana) cas tersimpan dalam setiap kapasitorb) Beza keupayaan yang merentasi setiap kapasitor.

(5mark)

9. The electric energy stored in a 10µF capacitor is 100µJ. Determinea) the charge stored in the capacitorb) the potential differences across the capacitor

Tenaga yang tersimpan dalam satu kapasitor 10 μF ialah 100 μJ. Kirakan

a) cas tersimpan dalam kapasitor b) Beza keupayaan merentasi kapasitor.

(5mark)

10. Point A and B are at distances 2.0cm and 3.0cm respectively from a point charge Q = -100µC. Determine

a) the electric potentials at A and Bb) the energy required in moving a point charge q = + 2.0µC, which is placed at A

to B.

Titik-titik A dan B berjarak 2.0 cm dan 3.0 cm masing-masing dari satu cas titik Q = + 100 μC. Kirakan

a) keupayaan elektrik pada titik A dan titik B.b) kerja yang dilakukan oleh satu agen untuk membawa satu cas q = + 2.0 μC dari

titik B ke titik A. ( 5 mark )

SECTION B ( 40 mark )Answer ALL question in this section.

1.a) Define capacitance and its unit for a capacitor

b) A capacitor of 20µF is fully charge by a d.c. supply of 20V.i) calculate the charge stored in the capacitor.

ii) calculate the energy supply to the capacitor. iii) calculate the energy stored in the capacitor.

c)

12 V

C1 C2

6.0µF 12.0µF

C3

8.0µF

Figure 5The figure 5 shows a network of capacitors which consist of capacitors C1, C2 and C3. Calculate the equivalent capacitance of the network of capacitors and the potential difference across capacitor C1. (10 mark)

2. a) State Coulomb’s law. When does the proportional constant in the equation representing the law have a value of 1/ 4πε0 ?

b)

+Q X Y

rx

ry

Figure 6

Define electric potential at a point, and derive an expression for the potential differences V between point X and point Y in an electric field due to single point charge +Q as shown in the figure 6.

(10mark)

3. a) (i) State Gauss’ Law.

(ii) Use Gauss’ law to show that the electric field strength E inside a parallel plate capacitor is σ / ε , with σ as the charge per unit area on each plate of the capacitor and ε as the permittivity of the medium between the capacitor plates.

( 6 mark )

(iii) By using the result E = σ / ε in (a)(ii), deduce an expression for the capacitance C of the parallel plate capacitor with area A on each plate and separation between plates d. ( 4 mark )

4. a) Define capacitance of a capacitor. ( 1 mark )

b) There is a uniform electric field E between the free space of two parallel plates of a capacitor. Write down an expression for the capacitance C of the capacitor and the energy U stored in the capacitor. Use the expressions to show that the energy per unit volume is ½ ε0 E2 as the permittivity of free space.

( 4 mark ) c) Define dielectric constant of an insulator material. ( 1 mark )

d) The potential difference between the plates of an isolated capacitor with capacitance 400 μF is 18.0 V. The space between the capacitor plates is then filled with a material of dielectric constant 4.0. Calculate the new potential difference between the capacitor plates and final energy stored in the capacitor.

( 4 mark )