TRIAL SEM 2 MBSSKL 2022

CONFIDENTIAL* 1

Nama : …………………………………………… Tingkatan : ………...……...

SEKOLAH MENENGAH KEBANGSAAN LAKI-LAKI METHODIST
JALAN HANG JEBAT, KUALA LUMPUR

PEPERIKSAAN PERCUBAAN TINGKATAN 6 SEMESTER 2/2022

Physics 960/2
Paper 2
(One and a half hours)

Instructions to candidates :
DO NOT OPEN THIS QUESTION PAPER UNTIL YOU ARE ALLOWED TO DO SO.
Answer all questions in Section A.
Answer all questions in Section B.
Answer two questions only in Section C.
All working should be shown. For numerical answers, units should be quoted wherever
appropriate.
Answers may be written either in English or Malay.
Fill in your personal details on page 7.

Arahan kepada calon:
JANGAN BUKA KERTAS SOALAN INI SEHINGGA ANDA DIBENARKAN
BERBUAT DEMIKIAN.
Jawab semua soalan dalam Bahagian A.
Jawab semua soalan dalam Bahagian B.
Jawab dua soalan sahaja dalam Bahagian C.
Semua kerja hendaklah ditunjukkan. Bagi jawapan berangka, unit hendaklah dinyatakan di
mana-mana yang sesuai.
Jawapan boleh ditulis dalam bahasa Inggeris atau bahasa Melayu.

Isi maklumat diri anda pada halaman 7.

This question paper consists of 12 printed pages.
© SMK (L) Methodist Kuala Lumpur

Peperiksaan Percubaan STPM 2022 – 960/2 CONFIDENTIAL*
*This question paper is CONFIDENTIAL until the examination is over.

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Section A [15 marks]
Answer all questions.

Indicate the correct answer on the Multiple-choice Answer Sheet provided.

1 Two charged spheres, Q1 and Q2 , are separated by a distance, d = 5 cm, attract one

another with a force of F = 3 mN. If one of them has three times more charges than the other,

what is the charges on each sphere?

Charges on Q1 Charges on Q2

A +0.017 μC − 0.050 μC

B +0.017 μC + 0.050 μC

C +1.7 μC − 5.0 μC

D +1.7 μC + 5.0 μC

2 Points A and B are each the same distance r from two unequal charges,  Q and  2Q
as shown in the figure below.

The work required to move a charge +q from point A to point B is

A dependant on the path taken from A to B
B positive
C zero
D negative

3 What effect will be on the capacitance of a capacitor when the area of the parallel plate
capacitor is decreased?

A It will increase.
B It will decrease.
C There will be no effect.
D It will initially increase and then decrease.

4 A 175 μF capacitor is fully charged by a 25 V battery and is then discharged. What is

the charge stored in the capacitor after two time constants of the circuit have passed since

discharging began?

A 1.2 103 C B 2.0 103 C C 3.0 104 C D 5.9 104 C

5 For a current-carrying wire, the current can be calculated using the equation shown.
I  nAvq

What is the meaning of n?
A The number of charge carriers in the wire.
B The number of charge carriers multiplied by the volume of the wire.
C The number of charge carriers per unit length of the wire.
D The number of charge carriers per unit volume of the wire.

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6 A piece of wire has a length of 0.80 m and a diameter of 5.0104 m . The I-V graph
characteristic of the wire is shown in the diagram below.

What is the resistivity of the metal from which the wire is made?
A 1.2 107  m B 1.6 107  m C 4.9 107  m D 2.6 106  m

7 Ten cells, each of electromotive force (e.m.f.) 1.5 V, are connected together, as shown
in the diagram below.

What is the combined e.m.f. between terminals X and Y?

A 15 V B 12 V C 9V D 8V

8 A potentiometer circuit is used to determine the unknown electromotive force (e.m.f.)
of a cell X. In the circuit shown, E is a cell with an e.m.f. that is know accurately. QR is the
potentiometer wire, which has a movable contact S. Contact S is connected to a galvanometer
and to cell X.

What is not a necessary requirement to determine the e.m.f. of X from the circuit?
A The internal resistance of cell X must be known.
B The e.m.f. of cell X must be lower than the e.m.f. of cell E.
C The lengths QS and QR must be determined accurately.
D The resistance of the wire QR must be proportional to its length.

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9 Which of the following diagrams represents the magnetic field due to a circular current?

AB

CD

10 Two concentric rings X and Y are placed on the horizontal plane, as shown in the
diagram below.

The radius of ring X is r1 = 1.0 m and r 2 = 2.0 m. The current flows in ring Y is four

times the current in ring X but in the opposite direction. The resultant magnetic flux density at

the centre of the rings is

A 1.5μoI and points towards N. B 0.5μoI and points towards N.

C 0.5μoI and points towards S. D 1.5μoI and points towards S.

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11 A rectangular coil rotates at a constant angular velocity. At the instant shown, the plane
of the coil is at right angles to the line ZZ’. A uniform magnetic field acts in the direction ZZ’.

What rotation of the coil about a specific axis will produce the graph of electromotive

force (e.m.f.) E against time t?

 B Through π about YY’
A Through 2 about ZZ’

 D Through π about XX’
C Through 2 about XX’

12 Faraday’s law of electromagnetic induction states that the electromotive force (e.m.f.)
induced in a conductor is proportional to

A the change of magnetic flux density.
B the change of magnetic flux linkage.
C the rate of change of magnetic flux density.
D the rate of change of magnetic flux linkage.

13 The diagram below shows a conducting rod of length L being moved in a region of a
uniform magnetic field B. The field is directed at right angles to the plane of the paper. The rod
slides on conducting rails at constant speed v. A resistor of resistance R connects the rails.

What is the power required to move the rod?

A v2 B2 L2 vBL C v2 B2 L2 D zero
R BR R2

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14 The graph below shows the variation with time of an alternating current in a resistor of
resistance 2.0 Ω.

What is the average power dissipated in the resistor?

A 16 W B 32 W C 160 W D 320 W

15 The diagram below shows an alternating voltage supply V = Vo sin ωt connected to a
capacitor of capacitance C..

The alternating current I flowing is

A I  CV cost B I  CV cost

C I   V cost D I  V cost
C C

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Name : Class :

Identity card number : Centre number/index number :

960/2 PERCUBAAN STPM 2022

SIJIL TINGGI PERSEKOLAHAN MALAYSIA
PHYSICS
PAPER 2

PUSAT TINGKATAN ENAM
SEKOLAH MENENGAH KEBANGSAAN (L) METHODIST

Instructions to candidates:
Tear off pages 7, 8 and 9 of your answer sheets of Section B, and tie them together with your

answer sheets of Section C.
For examiner’s use
Section A

Section B
16
17

Section C

Total

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Section B [15 marks] [1]
Answer all questions.

Write the answers in the spaces provided.

16 (a) Define magnetic flux.

(b) A solenoid of diameter 6.0 cm and 540 turns is placed in a uniform magnetic
field as shown in the diagram below.

The variation with time t of the magnetic flux density is shown in the diagram below.

Calculate the maximum magnitude of the induced electromotive force (e.m.f.) in the

solenoid. [3]

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(c) The north pole of a bar magnet is placed on top of a square coil of cross-

sectional area 3.0 × 10-4 m2. The coil has 800 turns. The magnet is quickly removed from the

coil in a time of 0.12 s. The average induced e.m.f. in the coil is 32 mV. Calculate the magnetic

flux density at the pole of the magnet. [4]

17 (a) Explain what is meant by the peak value and the r.m.s. value of a sinusoidal

alternating current. [2]

(b) The output of an alternating current supply is given by the expression [1]
V  15sin 3000t

where V is in volts and t is in seconds. Calculate
(i) the maximum voltage,

(ii) the r.m.s. voltage, [2]

(iii) the frequency of the current supply. [2]

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Section C [30 marks]
Answer two questions only.

You may answer all questions, but only the first two answers will be marked. Write the
answers on the answer sheets provided. Begin each answer on a new page of the answer sheet.

18 (a) State two functions of the dielectric in a capacitor. [2]

(b) Explain how a piece of dielectric inserted in between the plates of the capacitor

will increase its capacitance. [3]

(c) The variation with potential difference V of the charge Q on one of the plates of
a capacitor is shown in the Diagram 1.

Diagram 1 Diagram 2

The capacitor is connected to an 8.0 V power supply and two resistors R and S as
shown in the Diagram 2. The resistance R is 25 kΩ and the resistance of S is 220 kΩ. The
switch can be in either position X or position Y.

(i) The switch is in position X so that the capacitor is fully charged. Based

on the graph, calculate the energy E stored in the capacitor. [2]

(ii) The switch is now moved to position Y. Calculate the time constant of

the discharge circuit. [2]

(iii) The fully charged capacitor in (b) stores energy E. Determine the time

E [4]
taken t for the stored energy to decrease from E to 9 .

(iv) A second identical capacitor is connected in parallel with the first
capacitor. State and explain the change, if any, to the time constant of the discharge circuit. [2]

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19 (a) State two factors which affect the resistivity of a conducting material. [2]

(b) Show that the conductivity σ of a conducting material can be expressed as

  ne2
m

where n is the number of free electrons, e is the charge of an electron, m is the mass of
an electron and τ is the mean time between collisions of free electrons and positive ions. [4]

(c) An ohmic conductor is connected to an ideal ammeter and to a power supply of
output voltage V.

The following data are available for the conductor:

density of free electrons = 8.5 × 1022 cm-3

resistivity, ρ = 1.7 × 10-8 Ω m

dimension, w × h × l = 0.020 cm × 0.020 cm ×10 cm

The ammeter reading is 2.0 A.

(i) Calculate the resistance of the conductor. [2]
[2]
(ii) Calculate the drift speed v of the electrons in the conductor.
[2]
(d) The electric field E inside the conductor in (c) can be approximated as the [3]
uniform electric field between two parallel plates.

(i) Determine the electric field strength E.

(ii) Show that v 1 .
E ne

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20 (a) State both Kirchhoff’s laws. [2]

(b) In a car, the headlights are connected to the battery and would discharge the
battery if it were not for the alternator, which is run by the engine. Diagram below indicates
how the car battery, headlights and alternator are connected.

The circuit includes an internal resistance of 0.0100 Ω for the car battery and a [6]
resistance of 1.20 Ω for the headlights. For the sake of simplicity, the alternator is
approximated as an additional 14.00 V battery with an internal resistance of 0.100 Ω.
Determine the currents through the car battery, IB, the headlights, IH, and the alternator, IA.

(c) A battery with e.m.f. E and negligible internal resistance, is connected to two

resistors R1 and R2 in series. Derive the expression for the potential difference across R1 in

terms of E, R1 and R2. [3]

(d) Diagram below shows a 2.0 V potentiometer with a slide wire AB of length 100
cm is used for the determination of internal resistance of a 1.2 V cell.

When the switch S is opened, the balance length of the cell is 60.0 cm. When the switch

is closed, the balance length shifts to 32.0 cm of the potentiometer. Determine the internal

resistance of the 1.2 V cell. [4]

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*This question paper is CONFIDENTIAL until the examination is over.

PTE SMK (L) Methodist Kuala Lumpur
Peperiksaan Percubaan STPM Semester 2 2022

Skema Jawapan

Section A 6C 11 C
1A 7B 12 D
2C 8A 13 A
3B 9C 14 A
4D 10 B 15 A
5D

Section B
16

16(c)
17

17 (b) (i) Peak voltage = 15 V
17(b)(ii)
Vrms  V  15  10.6 V
17(b)(iii) 2 2

  2f  3000

f  477 Hz

Section C
18

18

19

20(a)
20(b)

20(c)

20(d) 1
1 r  32
1.2  60 cm 1.2 60
1  32 cm
1 r 1  0.64
1 r

r  0.5626 