Class : SMJK PEREMPUAN CHINA PULAU PINANG …...Na Class : SMJK PEREMPUAN CHINA PULAU PINANG TRIAL...

SMJK PEREMPUAN CHINA PULAU PINANG

TRIAL EXAMINATION 2013

FORM 5

PHYSICS

Paper 2

Two and a half hours

DO NOT OPEN THIS QUESTION PAPER UNTIL YOU ARE TOLD TO DO SO.

For examiner’s use

Section Question Marks

A

1 4

2 5

3 6

4 7

5 8

6 8

7 10

8 12

Sub Total

B

9 20

10 20

C

11 20

12 20

Total

This question paper consists of 16 printed pages

4531/2

Physics

Paper 2

Sept 2013

2 ½ Hours

Name : __________________

Class : _________________

INFORMATION FOR CANDIDATES

1. This question paper consists of three sections:

Section A, Section B and Section C.

2. Answer all questions in Section A. Write your answer

for Section A in the spaces provided in the question

paper.

3. Answer one question from Section B, and Section C.

Write your answer for Section B and Section C on

the writing paper provided by the invigilators.

4. Show your working, it may help you to get marks.

5. If you wish to cancel any answer, neatly cross out the

answer.

6. The diagrams in the questions provided are not

drawn to scale unless stated.

7. The marks allocated for each question or part of

question are shown in brackets.

8. The time suggested to answer Section A is 90

minutes, Section B is 30 minutes and Section C is

30 minutes. 9. You may use a scientific calculator.

10. Tie the writing paper and hand in together with this

question paper at the end of the examination.

Question Paper:

Set by Checked by Approved by

YCTay ...................... .......................

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4531/2 Physics Sept 2013

2

Section A [60 marks]

Answer all questions in this section.

1 Diagram 1.1 shows a pair of vernier callipers used by a student to measure the thickness of a

piece of plywood.

The student repeats the measurement by using a micrometer screw gauge.

Table 1.2 shows the readings obtained by the student when using vernier callipers and

micrometer screw gauge.

Measuring instrument

First mesurement/cm

Second measurement / cm

Third measurement /cm

Average reading / cm

vernier callipers

0.81 0.8 0.810

Micrometer

screw gauge 0.812 0.814 0.811

Table 1.2

(a) Complete the table above by calculating the average of the readings taken by using the

vernier calipers and micrometer screw gauge. [1]

(b) What is the mistake made by the student when recording the readings?

............................................................................................................................. ................... [1]

(c) State one advantage of using micrometer screw gauge compared with vernier callipers in measuring the thickness of the plywood.

............................................................................................................................. .....................

[1]

(d) Explain why the student is advised to measure the thickness of the plywood at different places.

............................................................................................................................. ..................... [1]

Diagram 1.1

Plywood

Vernier callipers

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3

2

Diagram 2 shows a toy with a dolly hung on the top edge of a curved mirror. F is the focal point

and C is the centre of curvature of the curved mirror.

(a) In Diagram 2, draw the ray diagram to show how the image of the dolly is being formed by

the curved mirror.

Use the arrow sign ( ) to represent the image of the dolly.

[2]

(b) State the characteristics of the image formed by the mirror in Diagram 2?

............................................................................................................................. ..................

[1]

(c) Underline the correct phrase in the brackets.

When the dolly swings from its initial position towards the mirror :

(i) Size of image (increases / decreases / remains the same).

(ii) Image distance (increases / decreases / remain the same).

[1]

(d) State two changes to the image of the dolly formed as it swings from its initial position

towards X.

............................................................................................................................. ...................

[1]

Diagram 2

X F C CC

C

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4

3

The equation below shows a nuclide of Polonium-210 undergoes a decay series to become a

nuclide of lead-206.

o

+ X α + Y β

(a) Find the value of X and Y.

X = .................................... Y = ..........................................

[2]

(b) Table 3 shows half-life of some radioactive nuclides.

Table 3

Nuclide Half-life

4.56 x 10

9 years

24.5 days

68 s

130 days

1620 years

(i) Using the information given in Table 3, find the time taken for 87.5 % of to decay?

[2]

(ii)

(iii)

Among the five nuclei, which one do you think is the rarest nucleus in nature?

.............................................................................................................................................. [1]

Explain your answer in (b) (ii)

............................................................................................................................. ......................

..................................................................................................................................................

[1]

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4 Diagram 4.1 shows two different metal spheres, J and K, each of mass 800 g, are immersed in the boiling water until a steady temperature is reached. Sphere J and K are then transferred

simultaneously into two separate beakers. Each beaker contains 500 g of water at room

temperature as shown in Diagram 4.2.

Diagram 4.1 Diagram 4.2

Diagram 4.3 shows the graph of temperature, T against time, t for the water in both beakers.

Diagram 4.3

(a) Based on the graph in Diagram 4.3, explain why the temperature of water in both beakers

(i) rises for the first 5 minutes.

............................................................................................................................. ..........[1]

(ii) becomes constant after 5 minutes.

............................................................................................................................. ..........[1]

(b) Based on the information from the graph in Diagram 4.3, calculate the specific heat capacity

for sphere J.

[Specific heat capacity of water = 4200 J kg-1 o

C -1

]

[2]

(c) State one assumption made in 4(b) to calculate the specific heat capacity for sphere J.

............................................................................................................... ...............................[1]

(d) State which metal (i) has higher specific heat capacity : .................................................. [1]

(ii) is a better heat conductor : .............................................................. [1]

J K

Boiling

water K J

T/oC

t / min

48

40

30

0 5 10

J

K

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6

5 Diagram 5.1 shows the signal of a whistle and a gong with different frequencies are connected to

the screen of a Cathode Ray Oscilloscope (CRO).

Diagram 5.1

(a) Based on Diagram 5.1,

(i) Which signal has higher pitch?

............................................................................................................................. .......... [1]

(ii) Which signal has longer wavelength?

............................................................................................................................. ..........

[1]

(iii) State the relationship between the pitch and the wavelength of the sound wave.

............................................................................................................................. ...............

[1]

(b) Diagram 5.2 shows the whistle is blown and the gong is hit in a room.

Diagram 5.2

It is found that the sound of whistle can be heard clearly at L and M only. However, the

sound of the gong can be heard clearly at L, M, and N.

Gong’s signal

Whistle’s signal

*L

*M

*N

Gong Whistle

Open door

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7

(i)

Name the phenomenon occurs in Diagram 5.2.

............................................................................................................................. ............... [1]

(ii) Explain why the sound of the gong can be heard at N but not the whistle.

............................................................................................................................. ...............

.................................................................................................................. .........................

............................................................................................................................. ..............

[2]

(c) Complete the following table to show the changes in the properties of sound waves after

they pass through the open door.

[Use the words increases, decreases or remain the same]

Property Changes

Frequency

speed

Amplitude

[2]

6 Diagram 6.1 and Diagram 6.2 show that current is being induced in the solenoid when a bar

magnet moves into the solenoid.


Bar Magnet

Bar Magnet

Solenoid Solenoid

X

Galvanometer Galvanometer

N

S

N

S

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8

(a)

Define induced current.

............................................................................................................................. ......................

.............................................................................................................................................. [1]

(b) Based on the Diagram 6.1 and 6.2,

(i) compare the magnitude of induced current.

............................................................................................................................. ........ [1]

(ii) compare the speed of bar magnet when it moves into the solenoid.

............................................................................................................................. ......... [1]

(iii) relate the height of bar magnet and its speed inside the solenoid.

...................................................................................................................................... [1]

(iv) relate the relative speed of bar magnet and the solenoid to the magnitude of induced

current .

............................................................................................................................. ...............

.................................................................................................................. ................... [1]

(c) Name the physics law that explains the comparison you made in (b).

............................................................................................................................. .................[1]

(d) State the polarity at the end X of the solenoid in Diagram 6.2 when the bar magnet moves into it.

............................................................................................................................. ................ [1]

(e) Suggest one method to increase the magnitude of the induced current in the solenoid.

............................................................................................................................. ................ [1]

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7 Diagram 7.1 shows a circuit consists a dry cell with electromotive force (e.m.f.) E, a bulb, an

ammeter, a voltmeter, a rheostat and a switch.

Diagram 7.1

The voltmeter shows a reading of 1.5 V when the switch is open. When the switch is closed, the

bulb lights up, the voltmeter reading is 1.4 V and the ammeter reading is 0.5 A.

(a) (i) Define the electromotive force, e.m.f. of a cell.

............................................................................................................................. ............

......................................................................................................................................... [1]

(ii) What is the e.m.f. of the cell?

............................................................................................................................. ...... [1]

(iii) Calculate the internal resistance, r of the dry cell.

[2]

(b) From the information in (a) (ii) and (a)(iii), sketch a graph to show the variation of the

reading of voltmeter , V and the current, I for the circuit shown in Diagram 7.1.

0

[1]

V/ V

I / A

Rheostat

V

E r

Bulb

Switch

A

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(c)

Diagram 7.2 shows a second identical dry cell is connected parallel to the first cell in the

circuit.

(i) What will be the reading of the voltmeter when the switch is open?

............................................................................................................................. ........ [1]

(ii) When the switch is closed, the ammeter reading is found to be more than 0.5 A.

Explain this observation.

............................................................................................................................. ...............

............................................................................................................................. ...............

.................................................................................................................. .....................[2]

(d) Table 7.3 shows the electromotive force, E and internal resistance, r of two types of battery.

Battery Electromotive force, E / V Internal resistance , r / Ω

Dry cell 1.5 0.2

Accumulator 9 0.2

Table 7.3

A boy uses six dry cells connected in series to replace an accumulator used in his toy car.

Explain why he is unable to start his toy car.

.................................................................................................................................................

............................................................................................................................. ................. [2]

Diagram 7.2

Rheostat

V

E r

E r

Bulb

Switch

A

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11

8

Diagram 8 shows a graph of force-extension for three springs P, Q and R.

Diagram

Diagram 8

(a)

State the law that explains the relationship between the extension of a spring and the force applied to it.

............................................................................................................................. ................ [1]

(b) On the graph in Diagram 8, mark ‘X’ at the elastic limit for spring P, Q and R. [1]

(c)

Which of the spring has highest spring constant?

............................................................................................................................. ................. [1]

(d) Find the spring constant for spring R when the law stated in (a) is obeyed.

[2]

Force / N

Extension / cm

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(e)

The spring stores energy when it is extended.

Calculate the energy stored in spring R when its extension is 8.0 cm.

[2]

(f) A six-month old baby with the body mass of 9 kg sleeps in a cradle. Based on Diagram 8,

state the suitability of the spring to make the cradle which can withstand the weight of the baby and last longer.

Give reasons for the suitability of the characteristics.

(i) spring constant

.......................................................................................................................................[1] Reason

.......................................................................................................................................

............................................................................................................................. ......... [1]

(ii) Elastic limit

............................................................................................................................. ..........[1]

Reason

........................................................................................................................................

...................................................................................................................... .................[1]

(iii) Determine the most suitable spring that can be used to make the cradle.

................................................................................................................................ [1]

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13

Section B [20 marks]

Answer any one question from this section.

9 Diagram 9.1 shows two pendulums of the same length with identical bobs P and Q.

Diagram 9.1

Pendulum P is displaced to position W and being released. It is seen that pendulum P comes to a

stop at X when it collides with pendulum Q at position Y, and pendulum Q rises to position Z.

(a) What is the meaning of momentum?

[1]

(b) Based on Diagram 9.1, compare (i) potential energy of the pendulum P at W and potential energy of pendulum Q at

Z.

(ii) kinetic energy of pendulum P at X before collision and kinetic energy of pendulum Q at Y after the collision.

(iii) momentum of pendulum P at X before the collision and the momentum of

pendulum Q at Y after the collision.

(iv) Relate the total kinetic energy and total momentum of pendulum P and Q before

and after the collision.

Name the type of collision involved. [5]

(c) Diagram 9.2 shows a mortar and pestle.

Diagram 9.2

By using suitable physics concept, explain how a mortar and pestle are used to pound

chillies and onion.

[4]

W P Q Z

P Q

X Y

Q

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(d) Diagram 9.2(a) shows a pilling rig in a construction side. Diagram 9.2(b) shows a close-up of the pile and the ram hammer.

Diagram 9.2(a) Diagram 9.2(b)

The ram hammer is lifted to a height by a crane and is allowed to fall on the pile. The guide

bars are there to ensure that the ram hammer is directed accurately onto the pile. You are required to give some suggestions to design a pile driving system which is safer

and more effective to be used. Explain your suggestions based on the following aspects:

(i) mass of the ram hammer

(ii) material of the ram hammer

(iii) height of the hammer to be raised before being released (iv) protection of the top end of concrete pile from being damage by the hammer.

(v) reduce the noise during piling.

[10]

10 A student set up two transformers to study how voltage of an alternating current supplies is

being used to light up a bulb.


(a) What is a step-down transformer? [1]

(b) (i) Compare the ratio of the number of turns in secondary coil to the number of turns in

primary coil, the output voltage at the secondary coil and the brightness of the bulbs in transformer P and in transformer Q. [3]

(ii) Relate the ratio of the number of turns in secondary coil to the number of turns in

primary coil and the brightness of the bulbs. Deduce a relationship between the ratio of number of turns in secondary coil to the

number of turns in primary coil and the output voltage of the transformer. [2]

(c) Explain how a transformer uses the magnetic effect of an electric current to light up a bulb

at the secondary coil. [4]

(d) The student would like to modify the transformer P to produce a output voltage of 3600 V with minimum loss of power. Explain the modifications that need to be made to achieve

this purpose. [10]

Crane

Ram

hammer

Pile

Guide bars

Ram hammer

Concrete pile

400 turns

240 V alternating

current

900 turns

240 V alternating

current

12 V 24 W Bulb Normal brightness

12 V 24 W Bulb dim

20 turns

25 turns

Transformer P

Transformer Q

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15

Section C [20 marks]

Answer any one question from this section.

11 Diagram 11.1 shows an air balloon that is used as a weather balloon to carry a meteorological

instrument for collecting data about the earth’s atmosphere. The ability of the weather balloon to

rise in the air can be explained based on the Archimedes’s principle.

Diagram 11.1

(a) (i) State the Archimedes’ principle. [1]

(ii) Explain why a rising balloon will stop moving upwards after reaching a certain

altitude. [4]

(b) Table 11.2 shows four hot air balloons, P, Q, R and S, with different specifications.

Table 11.2

You are required to determine the most suitable balloon which can be used for safe recreation. Study the specifications of all the four balloons from the following aspects:

(i) the material of envelope (ii) the size of the balloon

(iii) the number of burner used (iv) the type of basket used to carry the passenger.

Explain the suitability of the aspects. [10]

Canvas

envelope Canvas

envelope

Nylon

envelope Nylon

envelope

Rattan

basket

Rattan

basket

Steel

basket

Rattan

basket

Burner

Propane

tanks

Burner

Propane

tanks

Burner

Propane

tanks

Burner

Propane

tanks

P Q

R S

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16

(c) A hot-air balloon which contains 900 m3 of hot air with density 0.8 kg m

-3 is tied firmly to

the ground. The mass of the balloon (excluding the hot air inside) is 330 kg. The

surrounding air has a density of 1.3 kg m-3.

Calculate

(i) total weight of the balloon including the hot air inside it. [2]

(ii) the buoyant force acting on the balloon. [1]

(iii) the acceleration of the balloon when it is being released to the air. [2]

12 Nowadays, electronic components are made from semiconductor material to replace thermionic vacuum tube in most applications because they are cheaper, much smaller and can last for a

longer time.

(a) What is meant by thermionic emission? [1]

(b) The conductivity of semiconductors can be greatly increased by adding tiny but controlled

amount of certain other substances known as dopants or doping agents.

Two types of semiconductor materials, the n-type and the p-type, are obtained in this way. State the differences between the n-type and the p-type semiconductors.

[4]

(c) Table 12 shows the characteristics of five materials.

Material Melting

point / oC

Resistivity

/ Ω m

Valency of

dopant

Relative size of an atom of

dopant to that of the material

J 85 0.10 4 Larger

K 180 0.02 5 smaller

L 300 6.00 2 smaller

M 550 0.50 3 similar size

N 770 10.0 4 similar size

Table 12

Base on Table12; explain the suitable characteristics of the materials so that it can be used as a semiconductor with good conductivity.

Explain the suitability of each characteristic in table 12 and hence, determine which

material is most suitable to be used to make a good semiconductor. Justify your choice.

[10]

(d) Diagram 12(a) shows the setting of the Y-shift knob and Diagram 12(b) shows the setting of the time-based knob of an oscilloscope.

Diagram 12(a) Diagram 12(b) Diagram 12 (c)

Diagram 12(c) shows the trace of a signal displayed on the screen of the oscilloscope.

Find :

(i) the peak voltage of the signal (ii) the period of the signal

(iii) the frequency of the signal. [5]

~~ END OF QUESTION PAPER~~

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Class : SMJK PEREMPUAN CHINA PULAU PINANG …...Na Class : SMJK PEREMPUAN CHINA PULAU PINANG TRIAL...

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