2012 hkdse physics mock exam set 4 - paper 1

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DSE-PHY-MK4-121 HKDSE HKDSE HKDSE HKDSE Physics Physics Physics Physics Mock Paper Series Mock Paper Series Mock Paper Series Mock Paper Series Set 4 2012 HKDSE Physics Mock Exam Paper Paper 1: Multiple Choices questions Total: 40 Marks Time Limit: 1 hour Enrollment Hotline: 6772 3001 Website: www.andylai.hk MSN: [email protected] Address: Rm706, Prosper Commercial Building, 9 Yin Chong Street, Mong Kok, Kowloon, Hong Kong. Part IV Part IV Part IV Part IV: Electricity and Magnetism lectricity and Magnetism lectricity and Magnetism lectricity and Magnetism (100%): (100%): (100%): (100%): 1. 1. 1. 1. Electrostatics (20%) Electrostatics (20%) Electrostatics (20%) Electrostatics (20%) 2. 2. 2. 2. Circuit and Domestics Circuit and Domestics Circuit and Domestics Circuit and Domestics Electricity Electricity Electricity Electricity (40%) (40%) (40%) (40%) 3. 3. 3. 3. Electromagnetism Electromagnetism Electromagnetism Electromagnetism (40%) (40%) (40%) (40%) 特別為 特別為 特別為 特別為應考 應考 應考 應考 2012 年首屆中學文憑 年首屆中學文憑 年首屆中學文憑 年首屆中學文憑試的同學編寫的模擬試題系列 試的同學編寫的模擬試題系列 試的同學編寫的模擬試題系列 試的同學編寫的模擬試題系列. 深淺程度 深淺程度 深淺程度 深淺程度參考過往 參考過往 參考過往 參考過往會考和高考 會考和高考 會考和高考 會考和高考熱門 熱門 熱門 熱門試題 試題 試題 試題, 再加上可能出現的新題種 再加上可能出現的新題種 再加上可能出現的新題種 再加上可能出現的新題種. 每條試題結尾均 每條試題結尾均 每條試題結尾均 每條試題結尾均標註了相關課程章節 標註了相關課程章節 標註了相關課程章節 標註了相關課程章節, 提醒同學 提醒同學 提醒同學 提醒同學唔會 唔會 唔會 唔會讀漏書 讀漏書 讀漏書 讀漏書". 概念 概念 概念 概念(Qualitative)與計量 與計量 與計量 與計量(Qualitative)並重 並重 並重 並重, 讓同學深入思考 同學深入思考 同學深入思考 同學深入思考, "轉多幾過彎 轉多幾過彎 轉多幾過彎 轉多幾過彎". 特別設計 特別設計 特別設計 特別設計"分課 分課 分課 分課題(By Topics) "模擬試題 模擬試題 模擬試題 模擬試題, 讓同學 同學 同學 同學可以按 可以按 可以按 可以按課題熟識 熟識 熟識 熟識程度練習 程度練習 程度練習 程度練習. 同學 同學 同學 同學完成這一系列 完成這一系列 完成這一系列 完成這一系列模擬試題 模擬試題 模擬試題 模擬試題後, 希望能幫助 希望能幫助 希望能幫助 希望能幫助提升 提升 提升 提升應考 應考 應考 應考中學文憑試 中學文憑試 中學文憑試 中學文憑試的信心 的信心 的信心 的信心.

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Page 1: 2012 HKDSE Physics Mock Exam Set 4 - Paper 1

DSE-PHY-MK4-121

HKDSEHKDSEHKDSEHKDSE PhysicsPhysicsPhysicsPhysics Mock Paper SeriesMock Paper SeriesMock Paper SeriesMock Paper Series

Set 4

2012 HKDSE Physics Mock Exam Paper

Paper 1: Multiple Choices questions

Total: 40 Marks

Time Limit: 1 hour

Enrollment Hotline: 6772 3001 Website: www.andylai.hk MSN: [email protected]

Address: Rm706, Prosper Commercial Building, 9 Yin Chong Street, Mong Kok, Kowloon, Hong Kong.

Part IVPart IVPart IVPart IV:::: EEEElectricity and Magnetismlectricity and Magnetismlectricity and Magnetismlectricity and Magnetism (100%):(100%):(100%):(100%):

1.1.1.1. Electrostatics (20%)Electrostatics (20%)Electrostatics (20%)Electrostatics (20%)

2.2.2.2. Circuit and DomesticsCircuit and DomesticsCircuit and DomesticsCircuit and Domestics ElectricityElectricityElectricityElectricity (40%)(40%)(40%)(40%)

3.3.3.3. ElectromagnetismElectromagnetismElectromagnetismElectromagnetism (40%)(40%)(40%)(40%)

� 特別為特別為特別為特別為應考應考應考應考 2012 年首屆中學文憑年首屆中學文憑年首屆中學文憑年首屆中學文憑試的同學編寫的模擬試題系列試的同學編寫的模擬試題系列試的同學編寫的模擬試題系列試的同學編寫的模擬試題系列.

� 深淺程度深淺程度深淺程度深淺程度參考過往參考過往參考過往參考過往會考和高考會考和高考會考和高考會考和高考熱門熱門熱門熱門試題試題試題試題, 再加上可能出現的新題種再加上可能出現的新題種再加上可能出現的新題種再加上可能出現的新題種.

� 每條試題結尾均每條試題結尾均每條試題結尾均每條試題結尾均標註了相關課程章節標註了相關課程章節標註了相關課程章節標註了相關課程章節, 提醒同學提醒同學提醒同學提醒同學”唔會唔會唔會唔會讀漏書讀漏書讀漏書讀漏書".

� 概念概念概念概念(Qualitative)與計量與計量與計量與計量(Qualitative)並重並重並重並重, 讓讓讓讓同學深入思考同學深入思考同學深入思考同學深入思考, "轉多幾過彎轉多幾過彎轉多幾過彎轉多幾過彎".

� 特別設計特別設計特別設計特別設計"分課分課分課分課題題題題(By Topics) "模擬試題模擬試題模擬試題模擬試題, 讓讓讓讓同學同學同學同學可以按可以按可以按可以按課課課課題題題題熟識熟識熟識熟識程度練習程度練習程度練習程度練習.

� 同學同學同學同學完成這一系列完成這一系列完成這一系列完成這一系列模擬試題模擬試題模擬試題模擬試題後後後後, 希望能幫助希望能幫助希望能幫助希望能幫助提升提升提升提升應考應考應考應考中學文憑試中學文憑試中學文憑試中學文憑試的信心的信心的信心的信心.

Page 2: 2012 HKDSE Physics Mock Exam Set 4 - Paper 1

2012 HKDSE Physics Paper I – Set 4 Suggested Answers

1. A 2. A 3. B 4. D 5. B

6. C 7. C 8. D 9. B 10. C

11. D 12. A 13. D 14. C 15. A

16. B 17. C 18. C 19. B 20. C

21. C 22. C 23. D 24. D 25. C

26. C 27. A 28. B 29. C 30. C

31. C 32. C 33. B 34. B 35. A

36. A 37. A 38. B 39. D 40. A

* Super Challenge answer:

Question no. 24: The direction of the current is from B to A, the size is 3A.

Physics is easy!

No pains! No gains!

Page 3: 2012 HKDSE Physics Mock Exam Set 4 - Paper 1
Page 4: 2012 HKDSE Physics Mock Exam Set 4 - Paper 1
Page 5: 2012 HKDSE Physics Mock Exam Set 4 - Paper 1

黎黎黎黎 sir教室教室教室教室 DSE-PHY-MK4-121

2012 HKDSE Physics Mock Exam Set 4 – Paper 1

©2011 A Lai learning Center. ALL RIGHTS RESERVED.

www.andylai.hk Prepared by Andy Lai

P. 1

Part I: Multiple choices Questions:

1. The electric potential at a point is defined as

A. the electric potential energy per unit charge of a positive test charge placed at that point.

B. the electric potential energy per unit charge of a test charge placed at that point.

C. the electric potential energy per unit charge of a negative test charge placed at that point.

D. the electric potential energy of a positive test charge placed at that point.

(Reference: HKDSE Physics syllabus part IV a. electrical potential point 2)

2. Two positive and two negative point charges of equal magnitude are placed at the vertices

of a square as shown below. Each side is 22 meters. The origin of the axes is at the

centre of the square. What is the magnitude of electric field and electric potential at the

centre of the square?

A. Electric field: 0 N/C Electric potential: 0 V

B. Electric field: °πε16

Q N/C Electric potential: 0 V

C. Electric field: °πε16

Q N/C Electric potential:

°πε4

Q

D. Electric field: °πε4

Q N/C Electric potential:

°πε4

Q

(Reference: HKDSE Physics syllabus part IV a. electric field point 5 and electrical potential point 3)

Page 6: 2012 HKDSE Physics Mock Exam Set 4 - Paper 1

黎黎黎黎 sir教室教室教室教室 DSE-PHY-MK4-121

2012 HKDSE Physics Mock Exam Set 4 – Paper 1

©2011 A Lai learning Center. ALL RIGHTS RESERVED.

www.andylai.hk Prepared by Andy Lai

P. 2

3. The diagram below shows two stationary point charges +2Q and –Q. The +2Q are

equidistant from point B and point C. Which of the following statement must be correct?

A. The magnitude of electric field at point C is the largest.

B. The magnitude of electric field at point B is larger than that at point C.

C. The direction of electric field at point C is to the left while that at point D is to the right.

D. The magnitude of electric field at point A is the smallest.

(Reference: HKDSE Physics syllabus part IV a. electrical field point 5)

4. The diagram below shows the uniform electric parallel field lines in a region of space. A

negatively charged particle moves from P to Q.

A. Potential energy of a particle: decreases Change in potential between P and Q: negative

B. Potential energy of a particle: decreases Change in potential between P and Q: zero

C. Potential energy of a particle: increases Change in potential between P and Q: positive

D. Potential energy of a particle: increases Change in potential between P and Q: negative

(Reference: HKDSE Physics syllabus part IV a. electrical potential point 5)

Page 7: 2012 HKDSE Physics Mock Exam Set 4 - Paper 1

黎黎黎黎 sir教室教室教室教室 DSE-PHY-MK4-121

2012 HKDSE Physics Mock Exam Set 4 – Paper 1

©2011 A Lai learning Center. ALL RIGHTS RESERVED.

www.andylai.hk Prepared by Andy Lai

P. 3

5. The diagram below shows two charged parallel plates X and Y in a vacuum. X is positively

charged and Y is negatively charged. The distance between the plates is d. The magnitude

of the electric field is uniform and its magnitude is E. A particle with charge –q is

accelerated from rest from plate Y to plate X. Find the gain in kinetic energy of the –q

charge.

A. Ed

q

B. qEd

C. 2d

qE

D. It cannot be determined.

(Reference: HKDSE Physics syllabus part IV a. electrical potential point 2)

6. The sketch graph shows the variation with the distance d from the centre of a charged

sphere of potential V. The radius of the sphere is R.

The magnitude of electric field strength at a point P a distance D from the centre may be

defined as

A. D

VD−

B. 2

D

VD−

C. The slope of the tangent line of the graph at P

D. The negative slope of the tangent line of the graph at P

(Reference: HKDSE Physics syllabus part IV a. electric potential point 5)

Page 8: 2012 HKDSE Physics Mock Exam Set 4 - Paper 1

黎黎黎黎 sir教室教室教室教室 DSE-PHY-MK4-121

2012 HKDSE Physics Mock Exam Set 4 – Paper 1

©2011 A Lai learning Center. ALL RIGHTS RESERVED.

www.andylai.hk Prepared by Andy Lai

P. 4

7. The figure shows a pattern of electric field lines in which P, Q and R are points marked on

one of the lines with PQ = QR. If the potential at P is +200V, which of the following

statements is/are correct?

(1) If the potential at Q is 0 V, The potential at R would be lesson than -200 V.

(2) The electric field strength at P is larger than Q and R.

(3) If a positive charge is placed at P, it will accelerate towards Q and R with no force.

A. (1) only

B. (2) only

C. (1) and (3) only

D. None of the above

(Reference: HKDSE Physics syllabus part IV a. electric field point 2 electrical potential point 5)

8. The diagram shows 3 charges which is -2 coulombs each. What is the electrical potential

energy of the system below?

A. °πε

1

B. °πε4

3

C. °

−πε4

3

D. °πε2

3

(Reference: HKDSE Physics syllabus part IV a. electrical potential point 3)

Page 9: 2012 HKDSE Physics Mock Exam Set 4 - Paper 1

黎黎黎黎 sir教室教室教室教室 DSE-PHY-MK4-121

2012 HKDSE Physics Mock Exam Set 4 – Paper 1

©2011 A Lai learning Center. ALL RIGHTS RESERVED.

www.andylai.hk Prepared by Andy Lai

P. 5

9. In the circuit below, if the resistance of each resistor is the identical and the internal

resistance inside the battery is significant and cannot be negligible. If there is one more

identical resistor connected in parallel with the battery, what is the change in the potential

difference between the terminals of the voltmeter reading?

A. Increase

B. Decrease

C. Remains unchanged

D. Cannot be determined

(Reference: HKDSE Physics syllabus part IV b. series and parallel circuits point 2 simple circuits point 3 4)

10. In the figure below, the resistance of each resistor is R. What is the equivalent resistance

between A and B?

A. R/2 ohms

B. R/3 ohms

C. R/4 ohms

D. R/5 ohms

(Hints: Same point ⇒ Same potential!)

(Reference: HKDSE Physics syllabus part IV b. series and parallel circuits point 2)

Page 10: 2012 HKDSE Physics Mock Exam Set 4 - Paper 1

黎黎黎黎 sir教室教室教室教室 DSE-PHY-MK4-121

2012 HKDSE Physics Mock Exam Set 4 – Paper 1

©2011 A Lai learning Center. ALL RIGHTS RESERVED.

www.andylai.hk Prepared by Andy Lai

P. 6

11. What is the size of current I? (Assume there is no internal resistance inside the battery)

A. 1A

B. 1.5A

C. 6A

D. 9A

(Reference: HKDSE Physics syllabus part IV b. series and parallel circuits point 2 simple circuits point 5)

12. The graph shows the current-voltage (I-V) characteristic of an electrical component.

Which of the following statement is / are correct?

(1) The resistance of the electrical component is decreasing as current increases.

(2) The physical meaning of the slope of the graph is the reciprocal of its resistance.

(3) The electrical component obeys ohm’s law since the I-V graph is a straight line.

A. (1) only

B. (1) and (2) only

C. (2) and (3) only

D. (1), (2) and (3)

(Hints: This is a straight line but NOT passing through zero!)

(Reference: HKDSE Physics syllabus part IV b. resistance point 1 2 3)

Page 11: 2012 HKDSE Physics Mock Exam Set 4 - Paper 1

黎黎黎黎 sir教室教室教室教室 DSE-PHY-MK4-121

2012 HKDSE Physics Mock Exam Set 4 – Paper 1

©2011 A Lai learning Center. ALL RIGHTS RESERVED.

www.andylai.hk Prepared by Andy Lai

P. 7

13. If the battery is 10 V and the resistance of R1 and R2 are of the same resistance. What will

be the reading of the voltmeters if the switch S is closed?

A. V1 and V2 are both 5 V

B. V1 and V2 are both 10 V

C. V1 is 10 V while V2 is 5 V

D. V1 is zero V while V2 is 5 V

(Reference: HKDSE Physics syllabus part IV b. simple circuits point 5)

14. What is the potential at point X and point Y respectively?

A. Point X: 4.2 V Point Y: 3.3 V

B. Point X: 4.2 V Point Y: 2.5 V

C. Point X: 0 V Point Y: 2.5 V

D. Point X: 0 V Point Y: 3.3 V

(Reference: HKDSE Physics syllabus part IV b. series and parallel circuits point 2 simple circuits point 2 5)

Page 12: 2012 HKDSE Physics Mock Exam Set 4 - Paper 1

黎黎黎黎 sir教室教室教室教室 DSE-PHY-MK4-121

2012 HKDSE Physics Mock Exam Set 4 – Paper 1

©2011 A Lai learning Center. ALL RIGHTS RESERVED.

www.andylai.hk Prepared by Andy Lai

P. 8

15. The graph shows the I-V characteristic of two light bulbs X and Y. If X and Y are

connected in series with a 30 V battery with negligible internal resistance, what is the

approximate power dissipated in each bulb? (Hints: the slope of the I-V graph is not

constant.)

A. X: 20 W Y: 10 W

B. X: 45 W Y: 45 W

C. X: 7.5 W Y: 22.5 W

D. X: 50 W Y: 45 W

(Reference: HKDSE Physics syllabus part IV b. series and parallel circuits point 2 simple circuits point 3 4)

16. The circuit below shows an experiment to measure the resistance. Assume the resistance of

the ammeter is small but not zero and the resistance of the voltmeter is large but not

infinite. Which of the following statement is correct?

A. The resistance measured is smaller than its actual value.

B. The resistance measured is larger than its actual value.

C. The measured value of the resistance will be more accurate if its resistance is comparable

to that of the ammeter.

D. The measured value of the resistance will be less accurate if its resistance is comparable to

that of the voltmeter.

(Reference: HKDSE Physics syllabus part IV simple circuits point 4)

Page 13: 2012 HKDSE Physics Mock Exam Set 4 - Paper 1

黎黎黎黎 sir教室教室教室教室 DSE-PHY-MK4-121

2012 HKDSE Physics Mock Exam Set 4 – Paper 1

©2011 A Lai learning Center. ALL RIGHTS RESERVED.

www.andylai.hk Prepared by Andy Lai

P. 9

17. Which of the following is the reason to explain the heating effect when a current passes

through a conductor?

A. The moving free electrons, under the influence of the electric field, suffer collisions with

each other in the conductor. Some of electrons lose part of their kinetic energy to those

electrons they collided with and make them vibrate more vigorously and generate heat.

B. The moving free electrons, under the influence of the electric field, suffer collisions with

each other in the conductor. Some of electrons lose part of their kinetic energy to the

lattice ions and make them vibrate more vigorously and generate heat.

C. The moving free electrons, under the influence of the electric field, suffer collisions with

the atoms in the conductor. Some of electrons lose part of their kinetic energy which is

transferred to the lattice ions to make them vibrate more vigorously and generate heat.

D. The moving lattice ions, under the influence of the electric field, suffer collisions with the

free electrons in the conductor. Some of electrons lose part of their kinetic energy to those

lattice ions they collided with and make them vibrate more vigorously and generate heat.

(Reference: HKDSE Physics syllabus part IV b. electric power point 1)

18. When a voltmeter with resistance R connected across the Q and R, its reading is 6 V. What

is the power consumed by the voltmeter? Assume there is no internal resistance inside the

battery.

A. 2 mW

B. 37.5 mW

C. 6 mW

D. 12 mW

(Reference: HKDSE Physics syllabus part IV b. series and parallel circuits point 2 simple circuit point 4 electric

power point 2)

Page 14: 2012 HKDSE Physics Mock Exam Set 4 - Paper 1

黎黎黎黎 sir教室教室教室教室 DSE-PHY-MK4-121

2012 HKDSE Physics Mock Exam Set 4 – Paper 1

©2011 A Lai learning Center. ALL RIGHTS RESERVED.

www.andylai.hk Prepared by Andy Lai

P. 10

19. The resistance of a light bulb of normal rating “220 V, 60W” is measured by using the

voltmeter-ammeter method. At time = 0 s, The ammeter reads 200 mA when the voltmeter

reads 10 V. The resistance of the ammeter and voltmeter is negligible and infinite

respectively. The temperature of the light bulb is increasing for a while. Which of the

following statements is / are correct?

(1) The measured resistance is about 50 ohms.

(2) The ammeter reading will decreases as times goes by.

(3) The instantaneous power dissipated in the light bulb is 60W at time = 0 s.

A. (1) only

B. (1) and (2) only

C. (2) and (3) only

D. (1), (2) and (3)

(Reference: HKDSE Physics syllabus part IV b. resistance point 5 electric power point 2 domestic electricity point 1)

20. During Christmas holidays, Andy wants to decorate his house by switch on 10 neon light

bulbs. Suppose each light bulb is rated at “22V, 1100W” and the international standard of

voltage supplied in Hong Kong is 220V. How much does it cost to switch on 10 neon light bulbs

for 8 hours at its rating? Assume each unit of electrical energy costs HKD 0.9.

A. HKD 9.9

B. HKD 15.8

C. HKD 79.2

D. HKD 88.0

(Reference: HKDSE Physics syllabus part IV b. domestic electricity point 2 3)

Page 15: 2012 HKDSE Physics Mock Exam Set 4 - Paper 1

黎黎黎黎 sir教室教室教室教室 DSE-PHY-MK4-121

2012 HKDSE Physics Mock Exam Set 4 – Paper 1

©2011 A Lai learning Center. ALL RIGHTS RESERVED.

www.andylai.hk Prepared by Andy Lai

P. 11

21. Which of the following electrical safety rules is / are correct?

(1) Electrical appliances should be installed a fuse in the earth wire with appropriate ratings

to prevent getting electric shock in case of current leakage.

(2) Electrical appliances should be installed with an earth wire to earth all accessible

conductive parts to eliminate the risk of electric shock except for some double-insulated

electrical products.

(3) Three-pin plug is required for all electrical appliances including double-insulated electrical

products to fix the plug in its socket.

A. (1) and (2) only

B. (1) and (3) only

C. (2) and (3) only

D. (1), (2) and (3)

(Reference: HKDSE Physics syllabus part IV b. domestic electricity point 4)

22. Which of the following is / are most likely reason for blowing the fuse in a 3-pin plug?

(1) The fuse rating is higher than the normal working rating when the electrical appliance is

working normally.

(2) The fuse rating is lower than the normal working rating when the electrical appliance is

working normally.

(3) There is current leakage in the electrical appliance.

A. (1) and (3) only

B. (1) and (2) only

C. (2) and (3) only

D. (1), (2) and (3)

(Reference: HKDSE Physics syllabus part IV b. domestic electricity point 6)

Page 16: 2012 HKDSE Physics Mock Exam Set 4 - Paper 1

黎黎黎黎 sir教室教室教室教室 DSE-PHY-MK4-121

2012 HKDSE Physics Mock Exam Set 4 – Paper 1

©2011 A Lai learning Center. ALL RIGHTS RESERVED.

www.andylai.hk Prepared by Andy Lai

P. 12

23. Read the following passage carefully to answer question no. 23.

“The diagram below showing a circuit design of an standard electric tester screwdriver. It

is used to test if an electrical appliance is leaking current. The electrician should use his

finger to touch the metal cap (stated in the diagram below) and touch the tip of the

screwdriver to the metal case of the electrical appliance. If there is current leakage, the

neon lamp will light on. The resistance of the resistor used in the screwdriver is very

large.” (An extract of lecture conducted by Andy Lai on 18th October, 2008.)

Which of the following statements is / are correct?

(1) A resistor with very large resistance must be used to limit a current to a very small value

which is safe to normal human body.

(2) The neon lamp is used instead of a light bulb because the current is limited to a very small

value.

(3) There is a potential hazard of getting electric shock since there is a tiny current flowing

through the electrician’s body.

A. (1) only

B. (1) and (2) only

C. (2) and (3) only

D. (1), (2) and (3)

(Reference: HKDSE Physics syllabus part IV b. domestic electricity point 4)

Page 17: 2012 HKDSE Physics Mock Exam Set 4 - Paper 1

黎黎黎黎 sir教室教室教室教室 DSE-PHY-MK4-121

2012 HKDSE Physics Mock Exam Set 4 – Paper 1

©2011 A Lai learning Center. ALL RIGHTS RESERVED.

www.andylai.hk Prepared by Andy Lai

P. 13

24. In the circuit below, the rating of filament lamps L1 and L2 are “8V 32W” and “4V 4W”

respectively. What is value of R1 and R2 if both L1 and L2 have to work as rated values

stated above?

A. R1: 2 ohms R2: 1 ohms

B. R1: 2 ohms R2: 4 ohms

C. R1: 0.28 ohms R2: 1.67 ohms

D. R1: 26.2 ohms R2: 1.21 ohms

(Super challenge: What is the size and the direction of current between point A and point B?)

(Reference: HKDSE Physics syllabus part IV b. series and parallel circuits point 2 electric power point 2 domestic

electricity point 5)

25. An electric current is flowing in a copper wire in a circuit. The electrons in the copper wire

A. were at rest until the switch was closed but now move along the wire with a velocity of a few

millimetres per second.

B. had random motion until the switch was closed but now move along the wire with constant

acceleration due to the electric field present in the wire.

C. had random motion onto which was imposed a velocity of a few millimeters per second when

the switch was closed.

D. had random motion until the switch was closed but now move along the wire at a

speed approaching the speed of light.

(Reference: HKDSE Physics syllabus part IV c. Hall effect point 1)

Page 18: 2012 HKDSE Physics Mock Exam Set 4 - Paper 1

黎黎黎黎 sir教室教室教室教室 DSE-PHY-MK4-121

2012 HKDSE Physics Mock Exam Set 4 – Paper 1

©2011 A Lai learning Center. ALL RIGHTS RESERVED.

www.andylai.hk Prepared by Andy Lai

P. 14

26. Two flexible conducting ribbons are suspended from points P and Q. The bottom parts of

the ribbons lie in dishes of a conducting liquid at R and S respectively. Which is / are a

possible reason(s) to explain the changes at time = 10 s?

Time = 0 s Time = 10 s

(1) There is a current 2I passing from R to P through X, a current I is passed from S to Q

through Y and two flexible conducting ribbons are identical.

(2) There is a current 2I passing from R to P through X, a current I is passed from Q to S

through Y and two flexible conducting ribbons are with same masses.

(3) There is a current I passing from R to P through X, a current I is passed from Q to S

through Y and two flexible conducting ribbons are with different masses.

A. (1) only

B. (2) only

C. (3) only

D. (2) and (3) only

(Reference: HKDSE Physics syllabus part IV c. Current-carrying conductor in magnetic field point 1)

Page 19: 2012 HKDSE Physics Mock Exam Set 4 - Paper 1

黎黎黎黎 sir教室教室教室教室 DSE-PHY-MK4-121

2012 HKDSE Physics Mock Exam Set 4 – Paper 1

©2011 A Lai learning Center. ALL RIGHTS RESERVED.

www.andylai.hk Prepared by Andy Lai

P. 15

27. The magnetic field due to a steady current in the long air-core solenoid with N no. of turns

of coil and length L which is uniformly wound is 3109 −× T at the center and

3101 −× at

point Y as shown below.

If an identical solenoid is connected to the end of the first so as to extend it to as far as Y, and

the same current as before is passed through the complete solenoid, the magnetic field at X

will then be

A. 3105.5 −× T

B. 3105.9 −× T

C. 31010 −× T

D. 3

105.13−

× T

(Reference: HKDSE Physics syllabus part IV c. Magnetic effect of electric current point 3)

28. A long straight wire XY carries a direct current in the direction from X to Y. A rectangular

coil ABCD whose edges are parallel to the wire carries a current in the clockwise direction

ABCD.

Which of the following statement is / are correct?

A. There is a net force acting on the coil ABCD to the right.

B. There is a net force acting on the coil ABCD to the left.

C. There is a net force acting on the coil ABCD upwards

D. There is a no net force acting on the coil ABCD.

(Reference: HKDSE Physics syllabus part IV c. Magnetic effect of electric current point 3 current-carrying

conductor in magnetic field point 2)

Page 20: 2012 HKDSE Physics Mock Exam Set 4 - Paper 1

黎黎黎黎 sir教室教室教室教室 DSE-PHY-MK4-121

2012 HKDSE Physics Mock Exam Set 4 – Paper 1

©2011 A Lai learning Center. ALL RIGHTS RESERVED.

www.andylai.hk Prepared by Andy Lai

P. 16

29. In the diagram below, a moving negative charge with velocity “v” upwards is entering a

magnetic field which is into the paper at point A. its velocity at point A is in x-direction.

Which of the following is NOT a possible location when the moving negative charge leave the

magnetic field?

A. P

B. Q

C. S

D. None of the above

(Reference: HKDSE Physics syllabus part IV c. current-carrying conductor in magnetic field point 2)

30. Which of the following statements about the motor below is / are correct?

(1) The direction of the current in the external circuit will change when the coil is vertical in

order to make the coil rotating in the same direction.

(2) The net force acting on the coil is the zero when the coil is horizontal.

(3) The turning effect of the coil is the largest when the coil is horizontal.

A. (3) only

B. (1) and (3) only

C. (2) and (3) only

D. (1), (2) and (3)

(Reference: HKDSE Physics syllabus part IV c. current-carrying conductor in magnetic field point 5)

Page 21: 2012 HKDSE Physics Mock Exam Set 4 - Paper 1

黎黎黎黎 sir教室教室教室教室 DSE-PHY-MK4-121

2012 HKDSE Physics Mock Exam Set 4 – Paper 1

©2011 A Lai learning Center. ALL RIGHTS RESERVED.

www.andylai.hk Prepared by Andy Lai

P. 17

31. Two long conducting wires are placed in parallel as shown. They carry equal current in

the same direction. P and Q are points in between the wires and PQ is a line perpendicular

to both wires. Which of the following graph best shows the variation of magnetic field

along PQ? (Take the direction into the paper to be positive.)

A. B. C. D.

(Reference: HKDSE Physics syllabus part IV c. magnetic effect of electric current point 3)

32. The following figure shows an iron rod with mass m which is pulled along conducting

wires by a force F in a uniform magnetic field.

When the iron rod PQ is pulling by a force F along conducting wires in a uniform magnetic

field which is into paper,

A. current flows from P to Q across the rod.

B. a voltage is induced across PQ and Q will be at a higher potential.

C. a steady voltage will be induced across the iron rod if it is moving with uniform speed.

D. the iron rod PQ will accelerates with a magnitude equal to F / m.

(Reference: HKDSE Physics syllabus part IV c. electromagnetic induction point 1 2 3 5)

Page 22: 2012 HKDSE Physics Mock Exam Set 4 - Paper 1

黎黎黎黎 sir教室教室教室教室 DSE-PHY-MK4-121

2012 HKDSE Physics Mock Exam Set 4 – Paper 1

©2011 A Lai learning Center. ALL RIGHTS RESERVED.

www.andylai.hk Prepared by Andy Lai

P. 18

33. The figure shows a semiconductor specimen containing positive charge carriers. It has a

constant current flowing to the right and is perpendicular to a magnetic field point

downwards. A Hall voltage is developed between the face AB and face CD of the specimen.

This is the “Hall effect”.

Which of the following statements is / are correct?

(1) The Hall effect can be used to determine the flux density of the magnetic field due to an

alternating current.

(2) The Hall voltage will be reversed if the specimen is replaced by another semiconductor

containing negative charge carriers.

(3) The Hall voltage will become larger if the thickness t is reduced.

A. (1) only

B. (2) only

C. (1) and (2) only

D. (2) and (3) only

(Reference: HKDSE Physics syllabus part IV c. Hall effect point 3 4)

Page 23: 2012 HKDSE Physics Mock Exam Set 4 - Paper 1

黎黎黎黎 sir教室教室教室教室 DSE-PHY-MK4-121

2012 HKDSE Physics Mock Exam Set 4 – Paper 1

©2011 A Lai learning Center. ALL RIGHTS RESERVED.

www.andylai.hk Prepared by Andy Lai

P. 19

34. A circular frame and a square frame, made from the same type of insulated metal wires

with same thickness, are placed in a uniform magnetic field as shown. Andy is pulling the

square frame and the circular frame to the left with same uniform speed respectively.

Which of the following MUST be correct?

A. The induced current is in squared coil is larger than that in the circular frame.

B. There is no induced current flowing inside the square frame.

C. The resistance of the circular frame is larger than that of the square frame.

D. None of the above.

(Reference: HKDSE Physics syllabus part IV c. electromagnetic induction point 5 resistance point 4)

35. In the figure below, l = 2 m and v = 50 cm/s. B is the magnetic field directed

perpendicularly out of paper and its magnitude is 5106 −× T. The resistance of the circuit

ADCB is 5102.1 −× ohms. The rod AB is pulled by an external applied force to the right

with uniform velocity v. Calculate the power supply by the external applied force.

A. 4103 −× W

B. 4104 −× W

C. 4108 −× W

D. 4

1010−

× W

(Reference: HKDSE Physics syllabus part IV c. current-carry conductor in magnetic field point 2 electromagnetic

induction point 1)

Page 24: 2012 HKDSE Physics Mock Exam Set 4 - Paper 1

黎黎黎黎 sir教室教室教室教室 DSE-PHY-MK4-121

2012 HKDSE Physics Mock Exam Set 4 – Paper 1

©2011 A Lai learning Center. ALL RIGHTS RESERVED.

www.andylai.hk Prepared by Andy Lai

P. 20

36. In the figure above shows a type of motor. PQ and RS are solenoids. The solenoids and the

coil ABCD are connected in parallel to a battery.

Which of the following statements is / are correct?

1) The polarity of magnetism at end P is north while that at end R is south.

2) The component E is used to reverse the direction of current flowing through the coil

whenever the coil passes through the vertical plane to make the coil continue to rotate in

the same direction.

3) If the battery in the circuit above is replaced by a 50 Hz a.c. supply, the coil cannot

continue to rotate in the same direction when the coil passes through the vertical plane

since component E can only work with d.c. supply.

A. (1) and (2) only

B. (1) and (3) only

C. (2) and (3) only

D. (1), (2) and (3)

(Reference: HKDSE Physics syllabus part IV c.)

Page 25: 2012 HKDSE Physics Mock Exam Set 4 - Paper 1

黎黎黎黎 sir教室教室教室教室 DSE-PHY-MK4-121

2012 HKDSE Physics Mock Exam Set 4 – Paper 1

©2011 A Lai learning Center. ALL RIGHTS RESERVED.

www.andylai.hk Prepared by Andy Lai

P. 21

37. The figure below shows a portable transformer. It is only connected to the main supply

voltage of 220 V in Hong Kong as input voltage. By varying the turns ratio, its output

voltage can changed to either 6 V or 12 V.

Which of the following statements describing the transformer is / are correct?

(1) If the output voltage changes from 6 V to 12 V, the no. of turns in secondary coil should be

doubled given that the no. of turns of primary coil remains unchanged

(2) The input current should be four times than before if the output voltage is changed from 6

V to 12 V.

(3) The output power should be doubled if the output voltage is changed from 6 V to 12 V.

A. (1) and (2) only

B. (1) and (3) only

C. (2) and (3) only

D. (1), (2) and (3)

(Reference: HKDSE Physics syllabus part IV c. transformer point 2)

38. Which of the following is the reason for high voltage transmission of electricity for long

distance?

A. By R

VP

2

= , high voltage transmission of electricity will lead to a high power loss.

B. By IRV = and RIP 2= , high voltage transmission of electricity will lead to a low power

loss.

C. By IRV = and VIP = , the power loss of high voltage transmission of electricity cannot

be determined.

D. High voltage is easier to step up and down than low voltage.

(Reference: HKDSE Physics syllabus part IV c. high voltage transmission of electrical energy point 1)

Page 26: 2012 HKDSE Physics Mock Exam Set 4 - Paper 1

黎黎黎黎 sir教室教室教室教室 DSE-PHY-MK4-121

2012 HKDSE Physics Mock Exam Set 4 – Paper 1

©2011 A Lai learning Center. ALL RIGHTS RESERVED.

www.andylai.hk Prepared by Andy Lai

P. 22

39. Which of the following about the eddy current is correct?

A. There is an eddy current induced on the bottom of the cooking bowl to oppose the change

in the magnetic field caused by direct current (d.c) flowing through the coil inside the

induction stove. Therefore, a heating effect is created to cook the food inside the cooking

bowl.

B. Inside the transformer, the eddy currents induced in the iron core can be greatly reduced

by laminating iron core parallel the coil cross-section surface area.

C. Eddy current induced in the iron core of the transformer will increase its efficiency since

eddy current will increase the total output current.

D. None of the above.

(Reference: HKDSE Physics syllabus part IV c. electromagnetic induction point 8)

40. When the sinusoidal alternating current shown in Figure 1. Is applied to a resistor R, it

produces heat at a mean power rate of 20 W. What is the mean power rate of heat

production when a square wave of the same frequency and amplitude shown in the Figure

2. is applied to the same resistor R?

Figure 1. Figure 2.

A. 20 W

B. 28.3 W

C. 40 W

D. It cannot be determined since the resistance of the resistor is not given.

(Hints: root-mean-square value of sinusoidal wave = 2

valuepeak)

(Reference: HKDSE Physics syllabus part IV c. alternating current point 2 3)

The end.

Page 27: 2012 HKDSE Physics Mock Exam Set 4 - Paper 1

黎黎黎黎 sir教室教室教室教室 DSE-PHY-MK4-121

2012 HKDSE Physics Mock Exam Set 4 – Paper 1

©2011 A Lai learning Center. ALL RIGHTS RESERVED.

www.andylai.hk Prepared by Andy Lai

P. 23

黎黎黎黎 sir教室教室教室教室將陸續推出下列將陸續推出下列將陸續推出下列將陸續推出下列新高中新高中新高中新高中

中學文憑試模擬試題系列中學文憑試模擬試題系列中學文憑試模擬試題系列中學文憑試模擬試題系列, 包括包括包括包括: � 2012 HKDSE Physics Mock Exam Set 1 – Paper 1 (Heat and Gases)

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� 2012 HKDSE Physics Mock Exam Set 3 – Paper 1 (Wave Motion)

� 2012 HKDSE Physics Mock Exam Set 3 – Paper 2 (Wave Motion)

� 2012 HKDSE Physics Mock Exam Set 4 – Paper 1 (Electricity and Magnetism)

� 2012 HKDSE Physics Mock Exam Set 4 – Paper 2 (Electricity and Magnetism)

� 2012 HKDSE Physics Mock Exam Set 5 – Paper 1 (Radioactivity and Nuclear Energy)

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Page 28: 2012 HKDSE Physics Mock Exam Set 4 - Paper 1

黎黎黎黎 Sir 教室教室教室教室 A Lai Learning Center

HKCEE / HKALE / HKDSE / F.1 - F.7 / MO

AP / SAT / IB / GCSE / IGCSE / GCE / HSC

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� 黎黎黎黎 sir 在中學和大學時代已是一名傑出學生在中學和大學時代已是一名傑出學生在中學和大學時代已是一名傑出學生在中學和大學時代已是一名傑出學生, 曾獲取多項學業上和運曾獲取多項學業上和運曾獲取多項學業上和運曾獲取多項學業上和運動上的獎學金及獎項動上的獎學金及獎項動上的獎學金及獎項動上的獎學金及獎項;

曾代表香港參加曾代表香港參加曾代表香港參加曾代表香港參加國際性運動比賽國際性運動比賽國際性運動比賽國際性運動比賽, 取得優異成績取得優異成績取得優異成績取得優異成績, 「「「「又讀得又玩得又讀得又玩得又讀得又玩得又讀得又玩得」」」」, 絕不是死讀書的書呆子絕不是死讀書的書呆子絕不是死讀書的書呆子絕不是死讀書的書呆子.

� 黎黎黎黎 sir 在就讀大學時曾於全球最大美資電腦公司任實習生超過一年在就讀大學時曾於全球最大美資電腦公司任實習生超過一年在就讀大學時曾於全球最大美資電腦公司任實習生超過一年在就讀大學時曾於全球最大美資電腦公司任實習生超過一年, 大學畢業後旋即於全港最大英資電腦公司大學畢業後旋即於全港最大英資電腦公司大學畢業後旋即於全港最大英資電腦公司大學畢業後旋即於全港最大英資電腦公司, 負責主理該公司所代理的全球最大美資電腦公司儲存系統銷售業務負責主理該公司所代理的全球最大美資電腦公司儲存系統銷售業務負責主理該公司所代理的全球最大美資電腦公司儲存系統銷售業務負責主理該公司所代理的全球最大美資電腦公司儲存系統銷售業務(當時黎當時黎當時黎當時黎 sir 只得只得只得只得 24 歲歲歲歲).

� 於短短半年內將該產品線銷售業績提升超過於短短半年內將該產品線銷售業績提升超過於短短半年內將該產品線銷售業績提升超過於短短半年內將該產品線銷售業績提升超過 50%. 同時更被公司評選為同時更被公司評選為同時更被公司評選為同時更被公司評選為"傑出表現員工傑出表現員工傑出表現員工傑出表現員工 Outstanding Performer”,

成功將書本上的知識靈活運用於工作上成功將書本上的知識靈活運用於工作上成功將書本上的知識靈活運用於工作上成功將書本上的知識靈活運用於工作上.

� 黎黎黎黎 sir 為了教學理想為了教學理想為了教學理想為了教學理想, 毅然辭去工作毅然辭去工作毅然辭去工作毅然辭去工作, 全身投入教學事業全身投入教學事業全身投入教學事業全身投入教學事業, 希望將自己的一套獨特的學習方法教授學生希望將自己的一套獨特的學習方法教授學生希望將自己的一套獨特的學習方法教授學生希望將自己的一套獨特的學習方法教授學生 � 黎黎黎黎 sir 學生於學生於學生於學生於 2009 年年年年公開考試公開考試公開考試公開考試成績成績成績成績優異優異優異優異, 包括包括包括包括:

� 兩位學生成功拔尖兩位學生成功拔尖兩位學生成功拔尖兩位學生成功拔尖, 入讀港大科學系和中大法律系入讀港大科學系和中大法律系入讀港大科學系和中大法律系入讀港大科學系和中大法律系;

� 國際預科文憑國際預科文憑國際預科文憑國際預科文憑 (IB Diploma) 經濟科獲取最高等級經濟科獲取最高等級經濟科獲取最高等級經濟科獲取最高等級 (7 級級級級) 成績成績成績成績;

� 多位學生於多位學生於多位學生於多位學生於英國普通教育文憑英國普通教育文憑英國普通教育文憑英國普通教育文憑(GCE)及及及及英國普通中學教育文憑英國普通中學教育文憑英國普通中學教育文憑英國普通中學教育文憑(GCSE)獲取獲取獲取獲取 A/A*成績成績成績成績;

� 2009 年度年度年度年度 8 位學生參加位學生參加位學生參加位學生參加香香香香港港港港中學會考中學會考中學會考中學會考, 6 位取得位取得位取得位取得 20 分以上佳績分以上佳績分以上佳績分以上佳績, 並且所有科目皆取得並且所有科目皆取得並且所有科目皆取得並且所有科目皆取得 ABC 等等級等等級等等級等等級, 其中其中其中其中 1 位文位文位文位文

科生更獲取科生更獲取科生更獲取科生更獲取 26 分佳績分佳績分佳績分佳績, 整體整體整體整體 ABC 率達率達率達率達 78%, 整體合格率達整體合格率達整體合格率達整體合格率達 100%. 名符其實是小班教學名符其實是小班教學名符其實是小班教學名符其實是小班教學, 事半功倍事半功倍事半功倍事半功倍.

課程特色課程特色課程特色課程特色

� 小組教學小組教學小組教學小組教學(1 – 6 人人人人), 導師親身教學導師親身教學導師親身教學導師親身教學; 照顧每位學生需要照顧每位學生需要照顧每位學生需要照顧每位學生需要, 事半功倍事半功倍事半功倍事半功倍.

� 精心編制精心編制精心編制精心編制筆記筆記筆記筆記, 練習以近練習以近練習以近練習以近 20 年本地和外國公開試題為藍本年本地和外國公開試題為藍本年本地和外國公開試題為藍本年本地和外國公開試題為藍本.

� 概念理解概念理解概念理解概念理解, 取分技巧並重取分技巧並重取分技巧並重取分技巧並重; 協協協協助同學助同學助同學助同學盡快盡快盡快盡快掌握答題技巧掌握答題技巧掌握答題技巧掌握答題技巧.

� 歡迎自由組合小組上課歡迎自由組合小組上課歡迎自由組合小組上課歡迎自由組合小組上課, 時間及課程內容編排更有彈性時間及課程內容編排更有彈性時間及課程內容編排更有彈性時間及課程內容編排更有彈性.

� 時間及課程時間及課程時間及課程時間及課程請瀏覽以下網址請瀏覽以下網址請瀏覽以下網址請瀏覽以下網址: www.andylai.hk

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