# Spm 2009 Physics Paper2 Melaka

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Nama: ........................................................... Ting: ..........................

SEKOLAH MENENGAH KEBANGSAAN ASSUNTA

PEPERIKSAAN PERTENGAHAN TAHUN 2012FORM 5

PHYSICS

Paper 2 Time: 2 hours 30 minutes

--------------------------------------------------------------------------------------------------------------------------Prepared by: Pn Salina Saidi

Instructions: Answer all the questions in Section A, B and C.This paper consists of 18 printed pages.

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Section A

[60 marks]Answer all the questions in this section.

1. A boy cycling towards a beach. He takes 10 s cycling on the road and reducing his speed whileapproaching the beach.

.

Diagram 1

Diagram 1 shows the motion graph of his journey.

(a) Velocity can be define as ..Tick () the correct answer in the box below.

Rate of change of distance

Rate of change of displacement [1 m]

1

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(b) Base on the motion graph of Diagram 1,

(i) Find the gradient for the first 10 seconds.

(ii) Calculate the displacement of the boy from 0 to 20 seconds.

(c) State the physical quantity presented by the value (b)(i).

_________________________________________________________________

[2 m]

[2 m]

[1 m]

2

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2 Diagram 2.1 shows a boy pulling a metal box with a force of 30 N.

Diagram 2.1

(a) (i) Find the horizontal component of force,F. (1m)

(ii) Find the vertical component of force F. (1m)

(b) Calculate the work done by the boy when he pulls the wooden block

through a distance of 10 m.

(c) Suggest one method to pull the wooden block with smaller force.

---------------------------------------------------------------------------------

---------------------------------------------------------------------------------

(2m)

[2 m]

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physical quantity meaa

3. Diagram 3.1 shows a thermometer which has not been calibrated.

Diagram 3.1

.

Diagram 3.2 shows a part of the calibrating process of the thermometer .

Diagram 3.2

(a) (i) State the SI unit for the physical quantity mea sured by the thermometer?

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

(ii) Give one reason for the thermometer to be placed in the ice and in the steam state.

(1m)

(iii) Why mercury is used in the thermometer ? (1m)

____________________________________________________________________

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(b) The length of the mercury column in the thermometer is 2.6 cm at 0oC and 22.6 cmat 100oC.(i) What is the length difference between the mercury columns at 0 oC and at 100 C?

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

(ii) When the thermometer is placed in hot oil, the length of the mercury column is16.9 cm. Calculate the temperature of the hot oil. [2m]

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4. Diagram 4 shows a wooden block placed on a trolley at a certain height on a runway. The system is letto slide down the runway at constant speed of 4 ms-1.

Diagram 4

(a) On Diagram 4, label the direction of forces acting on the trolley at the stationary state.(2 m)

(b) State energy changes experiences by the system as it moves down the runway.

_________________________________________________________________(1m)

(c) The total mass of the wooden block and the trolley is 6 kg. As the system slide downthe runway , the motion is blocked by a book as shown on the diagram. (2m)

Calculate the momentum of the wooden block and the trolley before they hit the book.

(d) (i) What happens to the wooden block when the trolley hits the book? Explain.(2m)

_______________________________________________________________

___________________________________________________________________

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5. Diagram 5.1 shows a current-carrying wire placed between two opposite poles of two magnadurmagnets. The wire swings upwards as in the diagram below.

(a) The combination of the magnetic field and the current in the wire produces the resultant force, F

(i) Name the rule used to determine the direction of the force. (1m)

(ii) In diagram 5.2, draw the resultant magnetic field produced. (2m)

(iii) Using an arrow, show the direction of the resultant force, F in diagram 5.2. (1m)

(b) What are the factors affecting the magnitude of the force on a current-carrying wire in amagnetic field ? (2m)

_____________________________________________________________________________

_____________________________________________________________________________

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6. Diagram 6.1 and Diagram 6.2 show light rays from two identical objects passing through theconvex lenses, M and N. Both of the lenses produce virtual images. F is the focal point ofeach lens.

Diagram 6.1

Diagram 6.2

(a) What is meant by virtual image?

[1 mark]

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(b) Observe Diagram 6.1 and Diagram 6.2State the difference between:

(i) size of image produced by the lenses. (1m)

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(ii) the object distance ,u. (1m)

-------------------------------------------------------------------------------------------------

(iii) the image distance , v. (1m)

-----------------------------------------------------------------------------------------

(c) State the relationship between the image size and the image distance of the lens. (1m)

(d) Based on the answers in 6 (b) and 6 (c)

Write an equation to show the relationship between the magnification of the image, m ,object distance, u and the image distance, v. (1m)

(e) A c h i l d e x a m i n e s a n i n s e c t w i t h a m a g n i f y i n g g l a s s o f f o c a ll e n g t h 1 5 c m . T h e i n s e c t i s 5 m m i n l e n g t h a n d 1 0 c m f r o m t h el e n s . C a l c u l a t e :

(i) H o w f a r i s t h e i m a g e f r o m t h e l e n s . ( 2 m )

(ii) H o w l a r g e i s t h e i m a g e o f t h e i n s e c t ? ( 2 m )

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7. Diagram 7 shows air bubbles produced by an air pump in an aquarium filled

with fresh water.

(a) Explain why the volume of an air bubble increases as it moves towardsthe surface. (2m)

___________________________________________________________

(b) Name the physics law involved in (a) above. (1m)

_____________________________________________________________________

(c) What is the change in the volume of an air bubble at level R when the fresh water isreplaced by sea water ? Give a reason for your answer. (2m)

(d) An air bubble of volume 5 cm is released by an air pump at a depth of 0.5 m.Calculate the volume of the air bubble when it reaches the surface of the water.(Assume that the atmospheric pressure is 10 m water) (3m)

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8. Diagram 8.1 shows an apparatus set up to observe a pattern of electric field.

Diagram 8.1

(a) (i) What is meant by electric field?

[1 m]

(ii) In the space below, draw electric field pattern formed by the apparatusarrangement on Diagram 8.1

[2 m]

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(b) A current of 2.5 u A is let to flow for 3 minutes.Calculate:

(i) Quantity of charge carried by the current in 3 minutes. (2m)

(ii) Number of electrons flow in 3 minutes. (2m)

(c). Q, R and S are three set of apparatus to observe electric field.Table 8 shows the characteristics of each instrument used in the experiment.

Set of apparatus Type of power supply Type of electrode Type of liquid

Q Dry cell Glass rod Olive oil

R Extra high tension Metal Olive oil

S Low voltage supply Carbon Olive oil

Table 8

Based on Table 8, state the suitable properties for the set of apparatus to observe thepattern of the electric field.

(i) Type of power supply.

Reason

.

(2m)

(ii) Types of electrodes

..

Reason

(2m)

(d) Why olive oil is used in this experiment? (1m)

_________________

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_

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Section B

[20 marks]

9. Table 9.1 shows characteristics of a hydraulic system A. Table 9.2 shows characteristics ofa hydraulic system B. The systems are the application of Pascals principle.

Physical quantityHydraulic system A

Input Output

Force, F / N 10 40

Surface area, A / cm 2 50 200

Table 9.1

Physical quantityHydraulic system B

Input Output

Force, F / N 10 150

Surface area, A / cm 2 10 150

Table 9.2

(a) State Pascals principle?

(b) Based on Table 9.1 and Table 9.2,[2 m]

compare the hydraulic systems in terms of(i) the input forces

(ii) the surface areas(iii) the output forces(iv) the pressure transmitted

[4 m]

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(c) With the aid of Diagram 9.1, describe the working principle of a hydraulic jack?(4 m)

Diagram 9.1

(d) Diagram 9.2 shows a model of hydraulic brake system of a car .

Using your knowledge of Pascals principle and Diagram 9.2, explain the following:

(i) The suitable characteristics of the brake fluid and give an example of the brake fluid..

(ii) Water is not used as fluid for the hydraulic brake. Give reasons.

(iii) The working of the hydraulic brake in a car.[10 m]

Diagram 9.2

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Section C

(20marks)

10. Diagram 10.1 shows a rheostat. Rheostat is a common device used in the laboratory.

Diagram 10.1

(a) What is the function of the rheostat?[1 m]

(b) State one factor which effects the changes of the resistance in the rheostat.[1 m]

(c)Diagram 10.2 shows two cells of e.m.f 1.5V each connected to a 3V bulb. Diagram 10.3shows the same two cells connected in a different way to the same bulb.

(i) What is the type of connection in 10.2 and 10.3? (2m)

(ii) Explain why the bulb is brighter in diagram 10.3 compared to diagram 10.2. (2m)

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(d) Diagram 10.2 shows an electric kettle used to boil water.

Diagram 10.2

Table 10.3 shows the specifications of four wires of the same diameter that can be used as a

heating element of an electric kettle.

TypeJ K L M

Density/(kgm-3)6500 7000 5000 2500

Melting point/oC7500 8050 8500 9000

Oxidation rate High High Low Low

Resistivity/m8.0 x 10-7 7.0 x 10-7 5.0 x 10-7 8.0 x 10-7

Table 10.3

You are required to determine the most suitable wire and explain the suitability of thefollowing aspects :

-density-melting point-oxidation rate-resistivity (10m)

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(e) Diagram 10.4 shows a graph of current against voltage for wire A and wire B.

Based on Diagram 10.4:-

Diagram 10.4

(i) Name the wire with a bigger diameter. Give a reason.[2 m]

(ii) If the resistance of wire A is R1 and resistance of wire B is R2, determine theratio of R1 : R2. [3 m]

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