CONFIDENTIAL* /SULIT*

PEPERIKSAAN PERCUBAAN SETARA STPM NEGERI SEMBILAN DARUL KHUSUS

TAHUN 2011

DO NOT OPEN THIS BOOKLET UNTIL YOU ARE TOLD TO DO SO

Instructions to candidates: There are fifty questions in this paper. For each question, four suggested answers are given. Choose one correct answer and indicate it on the multi-choice answer sheet provided

Read the instructions on the multiple-choice answer sheet very carefully

Answer all questions. Marks will not be deducted for wrong answers.

A Data Booklet is provided

This question paper consists of 14 printed pages only. 1\";l Jabatan Pelajaran Negeri Sembilan 2011

STPM TRIAL 960/1 .,. This question paper is CONFIDENTL~ unti.l the examination is over.

[Turn over CONFIDEI'.l'IAL*

STPM DATA BOOKLET For 960 PHYSICS - PAPER I AND PAPER 2

960 PHYSICS STPM

CONSTANT VALUES

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Speed of light in free space c = 3.00 x 108 ms-1

Permeability of free space flo 4n X 1 o-7 Hm-1

Permittivity of free space £0 8.85 x 10-12 Fm-1

Magnitude of electronic charge e 1.60 X 10-19 C

Plank constant h = 6.63 x 10-34 Js

Unified atomic mass constant U = 1.66 X 10-27 kg

Rest mass of electron me= 9.11 X 10-31 kg

Rest mass of proton mp = 1.67 X 10-27 kg

Molar gas constant R = 8.31 JK-1 mor1

Avogadro constant

Boltzmann constant k =us x 10-23 n(-1

Gravitational constant

Acceleration of free fall g = 9.81 ms-2

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STPM TRIAL 960/1 *This question paper is CONFIDENTIAL until the examination is over.

[Turn over CO NFID E!-.'TIAL *

CONFIDENTIAL' 3

2

Which one of the following unit is derived unit?

A Candela B Mole c Second

v A liquid flowing horizontally through a pipe abides by the relation

v where is the rate of volume flow of the liquid

K is a dimensionless constant

pis difference in the liquid pressures at the two ends of the pipe

Lis the length of the pipe

R is the radius of the pipe

What is the dimension of If ?

A MLT 1 ll

D

KpR 4

((JL

D

Volt

3 The diagram below shows the path of a ball that was projected at an angle of 45' to the horizontal. By

ignoring the resistance of the air, the magnitude of change in momentum from the initial point 0 to the final

point Pis

0 p

A .fimu B 2mu c mu D

mu

2

4 The maximum engine's power of the lorry of mass 2000 kg is 259 kW, the minimum time required by

the lorry to accelerate from rest to the speed of 45 ms-1 is

A 40.0 s B 25.5 s C 8.1 s D 7.8 s

5 An object of mass m moves with constant speed in a horizontal circle which

has radius, r as shown in the diagram shown. Determine the value of work done

and the change in momentum of the object when it moves from point A to B.

Work done Change in momentum

A Zero mv

22mv2

B zero 2!

c ,

zero mv~

D zero zero

960/l *This question paper is CONFIDENTIAL until the examination is over. CONFIDENTIAL*

v

A

CONFIDENTIAL* 4

6 An external torque whose magnitude and direction are fixed acts on a rigid body hence causing the body

to rotate about a fixed axis, which one of the statements below is correct?

7

A The magnitude of the external force which produces the torque increases:~ ..

B The angular velocity of the body does not change when the body is exerted by the torque.

C The angular acceleration does not change when the body is acted on by the torque~

D The rotational kineti.c energy does not change when the body is acted on by the torque~

30~0 kg

20.0 kg

The above figure shows a system in equilibrium with the 30.0 kg block just about to slide along a horizontal

surface. What is the coefficient of static friction between the 30.0 kg block and the horizontal surface?

A 0.20 B 0.50 c 0.69 D 0.87

8

The diagram shows the position of two identical satellites at radius of R1 and R2 around the Earth. If U, K

and E represent the potential energy. the kinetic energy and the total energy of the satellites respectively.

Which one of the following statements states correctly the comparison of the three energies for satellite P

and S

A UP< Us 1 Kr>K, and E,<E,

B U,<U,, K,<K, and E, < E,

c u, > u,, K, <K, and EP> Es

D U,> U,, Kp < Ks and Ep < Es

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9 A particle is moving such that the force F on it changes with the distance r from a fixed point as

shown. F

0 r

Which graph best shows the relationship between the potential energy E, of the particle and the distance r?

A B c D

E, E,

r r r r

10 When damping is increased on an object undergoing resonant frequency oscillation, which change does

not occur?

A The amplitude of the driving oscillation decreases.

B The amplitude of the forced oscillation decreases.

C The resonant frequency decreases.

D The sharpness of the resonant peak decreases.

11 The diagram shows a long rope fixed at one end. The other end is moved up and down, setting up a

stationary wave.

vibration up and down

/ .-····------.,_fixed

end

What is the phase difference between the oscillations at X and Y?

1 1 A 0 B ~ffrad C -1rrad

4 2 D

3 -rr rad 4

12 A sound wave is emitted from a point source. The intensity of the sound wave is inversely proportional

to the square of the distance from the source. At a distance r from the source, the amplitude of the wave is

8X. What is the amplitude at a distance 2r from the source?

A 8X B 4X C 2X D X

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13 A student blows across the top of a hollow bamboo pipe. The bottom of the pipe is closed

by a finger so that a fundamental tone of frequency .f is produced. Then the student blows again with the

bottom of the pipe open. The tone that the student hears has a frequency

A equal to .f B lower than/ C higher than/ D fluctuating in the range off

14 The potential energy of a two-atom system is represented by a b

U = -, --;-, . The minimum value of U r- r -

represents

A the potential energy of the system when the atomic separation is a minimum.

B the potential energy of the system when the atomic separation is a maximum.

C the potential energy oftne system when the resultant force between the atoms is zero.

D the gravitational potential energy of the system when the atoms are at their lowest position.

15 Which of the following is the stress-strain graph for a glass rod which is stretched until broken?

Stress Slress Slf~SS ' / , . .,---"

,/ i

/1 /

0 I D i

Strain Straln 0'-----

A B c D

16 At what temperature is the r.m.s. speed of oxygen molecules the same as that of helium molecules at

300 K? [Relative molecular mass of oxygen= 32, relative molecular mass of helium= 4]

A 38 K B 849 K C 1440 K D 2400 K

17 The pressure p of an ideal gas is related to the mean square speed <c' > of the gas molecules by the

equation

1 0

p=-nm<c > 3

What are represented by n and m?

n

A Number of moles

B 1 Number of moles

c Number of molecules

iD Number of molecules per unit volume

111

Mass of one mole gas

Mass of one molecule

Mass of one molecule

Mass of one molecule

18 An ideal gas undergoes isothermal change. If its initial internal energy is U1 and its final internal

energy is U2, the change in the internal energy is

A 0 B c D

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19 The ratio of principal molar heat capacities for air is 1.4. When air ofvolume'SOO cm3 at a temperature

of27'C is compressed adiabatically to a volume of I 00 cm3, its new temperature is

A 187 'C B 298 'C C 326 'C D · 385 'C

20 One side of a room consists of a brick wall and a glass window. Both the brick wall and the glass

window have the same surface area. The thickness of the brick wall is 30 times that of the glass window,

I and the thermal conductivity of the brick is ·-that of the glass. The ratio of rate of heat flow through the

6 brick wall to that of the glass window is

A 5: I B 180: I c I : 5 D 1 :180

21 In an experiment to measure the thermal conductivity of a good conductor, a long test sample is used

so that

A the heat loss can be neglected

B the steady state is easily achieved

C the heat flow is parallel throughout the sample

D the temperature difference between the two ends of the sample is sufficiently large

22

2.0 m 2.0 m

A

The above figure shows three negative charges with charge -q or -2q are placed at the vertices A, B and C

of an equilateral triangle in free space. The length of each of the three sides is 2.0 m and Sis the idle point

of the side BC. What is the electric field strength at pointS?

A q

along AS B 2q

along AS 67r& 0

3m:,

c q along SA D

2q along SA

6nc o 3:rrc o

96011 *This question paper is CONFIDENTIJ\L until the examination is over. CONFIDENTIAL*

CONFIDENTJAL•' g 23 The diagram below shows the electric field lines between two parallel metal plates, A and B.

..,.y 1 oo r· --------r-----. .-----~---------

5. 0 em y

B z or

If )(Y = _!_ XZ, determine the work done in moving an electron from X toY ~

A c D

24 A certain capacitor consists of a pair of parallel metal plates separated by a distance d in the air. The

capacitor is charged then disconnected from the charging source and immersed in a liquid with permittivity

E. Which of the following statements regarding the capacitor is correct?

A Both the charge stored in the capacitor and its capacitance decreased.

B Both the charge stored in the capacitor and its capacitance increased.

C The capacitance of the capacitor increased but the potential difference across it decreased.

D The capacitance of the capacitor increased but the potential difference across it increased.

25 The circuit diagram shows a 10 kQ resistor and a 40 kQ resistor connected across a charged capacitor C.

,, r·y;------,- i c s

I

10 kQ

40 kQ

After switch S is closed. the potential difference V across the capacitor varies with timet. The graph of

In V against tis given as shown below.

In V

2

o'------~20~-.. t(s)

The capacitance of the capacitor is

A 1.2s x w' F B 2.00 X W 4 F c 1.2s x 1 o-' F D 2.50 X 10-3 F

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26 When a potential difference V is applied across the ends of a copper wire which has diameter d and

length /, the drift velocity of the electron is v. What is the drift velocity if the same potential difference is

applied across a copper wire ofhalfthe diameter but twice the length?.·: ·

A v

B v c v D 2v

4 2

27 The resistance of a piece of pure silicon decreases rapidly with increasing temperature because

A the drift velocity of the charge carriers increases.

B the number of charge carriers increases

C the ratio of negative charge carriers to positive charge carriers increases

D the ratio of positive charge carriers to negative charge carriers increases

28 A battery of e.m.f. 2.0 V and negligible internal resistance is connected to four resistors as shown in

the diagram below.

-·-2.0 v -·,­

'

What is the potential difference between the points P and Q ?

A 0 V B 0.33 V C 0.67 V D 1.00 V

29 A milliammeter with negligible resistance gives a full scale deflection for 1 rnA. To convert it to a

voltmeter having a full scale deflection of 5 V,

A Connect a 5Q resistor in series with the milliammeter

B Connect a 50 Q resistor in parallel with the milliammeter

C Connect a 5 x 103 [l resistor in series with the milliammeter

D Connect a 5 Q resistor in series with the milliammeter and a 5 x 103 n resistor in parallel with the

milliammeter

30 An electron and a proton both entering perpendicularly in the same magnetic field separately. If the

speed of the electron is I 0 times the speed of the proton. The ratio of the magnetic force on the electron to

the force on the proton is

A 1: I B I : 5 c 1 : 10 D 10:1

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31 If the current through a long solenoid is doubled while the coil's length is also doubled, keeping the

total number of turns constant, the magnetic field at a middle point in the solenoid is .

A four times larger

B two times larger

C unchanged

D half the original size

32 When the speed of an electrical motor is increased due to a decreasing load, the current flowing

through it decreases. Which of the following is the best explanation of this phenomenon?

A The induced back e.m.f increases

B The resistance of the coil changes

C Frictional forces increased as the speed increases

D At high speeds it is more difficult to feed current into the motor

33 A circular flat coil of 200 turns of wire encloses an area of I 00 cm2

The coil is immersed in a uniform

perpendicular magnetic field Of 0.50 T that penetrate the entire area. If the field drops to zero in 200 ms,

what is the current induced in the coil if it has a resistance of 25 0?

A 0.20A B 0.50 A C l.OA D 5.0A

34 An alternating current 1 which flows through a 10 Q resistor is given b.Y 1= 3 sin lOOt. If I is in

amperes and tin _s.econck the mean power generated in the n:si<:.;tor is

A lOW B 30W C -15W D JOOW

35 The graph below shows the variation of reactance and frequency of an alternating current flowing

through three electrical components X, Y iilld Z.

Reactance

/ X

y

___ z

What are the components X, Y and Z?

X y z A Capacitor Resistor Inductor

B Inductor Resistor Capacitor

c Inductor Capacitor Resistor

D Resistor Capacitor Inductor

96011 *This question paper is C01\FIDENTlAL until the examination is over. CONFIDENTIAL*

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36 The diagram shows a circuit of an inve1iing amplifier.

An input voltage of +2 V produces an output voltage of -8 V. Which statement about the circuit is not

true?

A

B c D

R,. The value of ~·· IS 4.

R,

The voltage gain is- 4.

When the input voltage is -I V, the output voltage is+ 4 V.

When the input voltage is 2 V, the potential at point Pis 2 V.

37 If the input voltages V, and V2 in the circuit below are 50).lV and 90 J.N respectively, what is the

output voltage? [Gain~ I O']

+ 15 v

vt v2

-15 v

-'----"'if _______ __:!_ 0 v

A 40 J.!V B 4.0 V C +!5V D -15V

38 The propagation of an electromagnetic wave is accompanied by electric field oscillations and magnetic

field oscillations. Which of the following statements is no! true concerning the electromagnetic wave?

A The electromagnetic wave can be polarized.

B The electric field oscillations and the magnetic field oscillations are in phase.

C The directions of the electric field oscillation, the magnetic field oscillations, and the

electromagnetic field are perpendicular to one another.

D The oscillating frequency of the electric field and the oscillating frequency ofthe magnetic field

change when electromagnetic wave propagates from one medium to another medium.

960'1 *'This question paper is CONFIDE.'JTIJ\L until the examination is over. CONFIDENTIAL*

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39 The diagram below shows a long glass rod with uniform diameter 2r. . The left end of the rod has a

semicircular convex surface of radius r. The refractive index of the glass is n-. An object 0 is placed on

the left side and at the axis of the rod.

O>E---~ I I

I I I I I I I I I

~ u ---7:~--- v ----:::>~:

2r

If the image distance v produced in the rod is twice the object distance from the end of the rod, the object

distance u is

(n+2}r A 2n B

(1'1 +:2)r

2(n-( c 2 (n- t)1·

c,~ + 2) D 2(1-n)r

(r:!+2)

40 A monochromatic light is directed towards a single adjustable slit to produce a diffraction pattern on

a screen as shown.

Intensity Central maximum

Subsidiary maxima

0

When the width of the slit is reduced,

A the intensity of the central peak will mcrease and the intensity of the subsidiary maxima will

decrease.

B the intensity of all maxima will increase and the width of the pattern will decrease.

C the intensity of all maxima do not change and the width of the pattern will increase.

D the intensity of all maxima will decrease and the width of the pattern will increase.

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41 The diagram below shows a light beam incident on the surface of glass which has been coated with an

optical materiaL

If the wavelength of light in the optical material is J. and the reflective index for the optical material and the

glass are n1 and n2 respectively, which of the following is the condition for the reflected light beams x andy

to experience destructive interference?

A

c ;{ t = - and n1 < n:2

2

B

D t = A and n 1 < n:!

42 Which of the following is true based on the photoelectric effect?

A The emission of electrons will not occur for very low light intensity.

B The number of electrons produced per second does not depend on the intensity of light.

C The maximum velocity of the electrons increases when the wavelength of light decreases.

D The average kinetic energy of the electrons decreases when the frequency of light increases

43 If electron A has twice the kinetic energy of electron B, the ratio of the de Broglie wavelength of

electron A to that of electron B is

A 1 : 2 B ] : \ ~ c 2. D

44 A hydrogen atom absorbs a photon and as a result an electron is excited from the ground state to the

second excited state. lfthe n,h energy level of the hydrogen atom is given by £, =-13

;6

eV, the photon n-

energy absorbed is

A 3.4 eV B 10.2 eV C 13.6 eV D 12.1 eV

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45 The property of the metal should be chosen as a target anode in an X-ray tube is

A a good conductor of electricity

B a good conductor of thermal energy

C a good insulator of thermal energy

D a good reflector of thermal energy

46 The mirror fixed at the end of the tube in a helium-neon laser system is used to

A improve the rate of production of electrons

B increase stimulated emission of photons

C absorbed part of the photons

D reduces the loss of laser light from the system

47 The mass of the nucleus 6~ I 1 ,;cu, the mass of nucleus 1 H and the mass of 0 n are 62.9296u,

1.00783u, and 1.00867u respectively. What is the binding energy per nucleon for the nucleus?

A 5.40 X 10-13 J B 1.28 X J0 -!2 J D 8.85 x 10-11 J

48 A radioactive isotope of an element X experiences a series of decays until it becomes a stable isotope

for element X. In the process, the ratio of number of a particles emitted against the number of j3 particles

emitted is

A 2:2 B 2: 1 c 1:2 D 1 : 1

49 Helium nucleus is produced when a lithium nucleus is bombarded by a proton, as shown in the below

equation:

If the speed of light is c, mass of lithium is mL.rnass of proton is mp and mass of helium is mH, which of the

following expressions represents the energy released in this nuclear reaction?

A (mL + mp+2 mH) c'

' B (mL + mp- 2 mH) c C (mL + 2 mH- mr) c2

D (mL + 2 mH + rnp) c:;

50 Which one of the following is the main characteristic of a quark?

A Jt has zero rest mass

B lt travels at the speed of light

C lt has fractional charge

D lt is a combination of baryons

96011 *This question paper is CONFIDENTIAL until the examination is over. CONFIDENTIAL*