Mid Year Exam Physics Paper 2 Form 4 2009

SULIT

4531/2 Name:……………………………….

Date:………

…… 4551/2 Physics Paper 2 May 2009 SMK LUBOK CHINA, 78100 LUBOK CHINA, MELAKA MID-YEAR EXAMINATION 2009 FORM 4RKA PHYSICS Paper 2 2 hours and 30 minutes JANGAN BUKA KERTAS SOALAN INI SEHINGGA DIBERITAHU Section

A

B C

Number question 1 2 3 4 5 6 7 8 1 2 1 2

Mark

Total 1. This question paper concists of three sections: Section A, Section B and Section C. 2. Answer all questions in Section A. 3. For Section B and C, answer any one question. Write your answer in the spaces provided on the question paper answer. 4. The diagrams in the questions provided are not drawn to scale unless stated. 5. The marks allocated for each sub-part of a question are shown in brackets. 6. You may use a non-programmable scientific calculator. 7. Hand in this question paper at the end of the examination.

2

Kertas soalan ini mengandungi 14 halaman bercetak Prepared by,

Verified by,

……………………. (Pn.Rahayu Johari) Subject Teacher

...................…………………… (PN. NOR AZIZAH BT ALIAS) GKMP Science & Mathematics

The following information may be useful. The symbols have their usual meaning. a=

n

v−u t

1.

=

sin i sin r

16. n

2.

real depth appreantdepth

17.

v2 = u2 + 2as

+

at2

s = ut +

1 2

3.

=

18.

1 = f

1 u

1 v

=

λ

ax D

4.

Momentum = mv

19.

5..

F = ma

20.

6.

Kinetic Energy = ½ mv2

21.

V = IR

7.

Potential Energy = mgh

22.

Q = It

8.

Elastic Potential Energy = ½ Fx

23.

9.

ρ

v = f

λ

Np Ns

=

Vp Vs

Efficiency, n =

=

m V

24.

x 100%

I s Vs I p Vp

3

10.

11.

Power, P = IV Pressure, P = h

25.

ρ

g = 10 ms-2

g

Pressure , P =

F A

12.

13.

Heat, Q = mcθ = constant

PV T

14.

15.

E

= mc2

Section A [60 marks] Answer all questions in this section The time suggested to complete this section is 90 minutes. 1 A student measured the diameter of a wire using a rule as shown in Figure 1.1.

20 Complete curls FIGURE 1.1 a) Why is the measurement doesn’t start from zero? _______________________________________________ mark]

[1

4

b) State a reason why the measurement is done by 20 curls and not one curl. __________________________________________________________ [1 mark] c) What is the diameter of the wire? _______________________________________________

[1

mark] d) Suggest a suitable instrument which can be used to measure the diameter of the wire. ______________________________________________________ [1 mark]

2.

Table 1 shows the measurements of the diameter of a test tube ball by using three instruments X, Y and Z. The actual measurement of the diameter is 1.20 cm. Measuring Instrument X Y Z

Diameter of test tube / cm 1.3 1.24 1.202

1.2 1.22 1.206

1.3 1.23 1.204

a) Name the measuring instruments X, Y and Z X Y Z b) Calculate the average reading for all the instruments used.

5

[3 marks] c) i) Based on the calculation in (b), which is the most accurate instrument? _________________________________________________

[1

mark] ii) Give a reason for your answer in (c) (i). _________________________________________________

[1

mark] d) Give two ways to improve the accuracy of the measuring instrument used. _________________________________________________________________ _________________________________________________________________ [2 marks] 3.

Read the following passage carefully.

6 On June 14, 2008, three friends took a trip to Kota Kinabalu to climb up Mount Kinabalu. They were very excited. They took a bus at 12.00 midnight from Bayan Baru, Penang to the bus terminal in Jalan Duta, Kuala Lumpur. The distance from Bayan Baru to the bus terminal in Jalan Duta is 450 km. They arrived at Kuala Lumpur at 5.00 am on June 15, 2008. From the bus terminal Jalan Duta, they took a taxi to KLIA. They journey of 60 km took 45 minutes and cost them RM 80. The flight to Kota Kinabalu was fast as the aeroplane flew with an average speed of 600 km/h and the flight took only 2 hours 30 minutes. The next day they hiked up the Mersilau trail which about 6 km long to Laban Rata, the base station for Mount Kinabalu. Laban Rata is about 3 000 m above sea level. In the early hours of the next day, they began their hike to the peak which is 4 095 m above sea level. That morning the wind was blowing with a velocity of 10 ms-1 and the a) From the passage, identify the physical quantities and then classify them into base quantities and derived quantities. Base Quantity

Derived Quantity

[4 marks] b) State two advantages of using SI unit of measurement. ______________________________________________________________ ______________________________________________________________ [2 marks] 4.

Figure 2 shows an ammeter of 0—3 A range.

7

Figure 2 a) i) Name component X. ________________________________________ [1 mark] ii) What is the function of X? _________________________________________________________ [1 mark] b) Table 2 shows three current readings obtained by three students. Studen t 1 2 3

1 Reading 0.9 0.8 0.8 st

Current / A 2nd Reading 2.6 2.6 2.5

3rd Reading 3.0 3.2 3.2

Table 2 i) Did all the students use the ammeter in Figure2? ___________________ [1 mark] ii) Explain your answer in (b)(i). ___________________________________________________________ ___________________________________________________________ [2 marks]

5.

Figure 1 show a ticker tape obtained from a trolley moving on a plane. Each strip of ticker tape contains 11 ticks. The electrical supply to the ticker timer is 50 Hz.

8

Figure 1 a) Describe the movement of the trolley based on the ticker tape above. ____________________________________________________________ [1 mark] b) Describe the power supply used to run the ticker timer. ____________________________________________________________ [1 mark] c) What is the time interval for 11 ticks on the ticker tape? [1 mark] d) What is the initial velocity of the trolley based on the ticker tape?

[2 marks] e) What is the final velocity of the trolley based on the ticker tape?

[2 marks] f) Calculate the acceleration of the trolley.

[3 marks]

6.

Ahmad cycles to school every day. The graph in Figure 2 shows a typical velocity-time graph of Ahmad’s journey to school.

9

Figure 2 a) Describe the following parts of Ahmad’s movement. i) A to B ____________________________________________________________ [1 mark] ii) B to C ____________________________________________________________ [1 mark] b) For how long was Ahmad travelling at constant deceleration? __________________________________________________________________ [1 mark] c) Calculate the total distance travelled by Ahmad.

[3 marks] d)

7.

Find Ahmad’s average velocity for the whole journey.

[2 marks] Figure 7(a) and 7(b) show two students of equal mass of 50 kg each playing on a skateboard. The girl was stationary at the beginning and then moves together with the boy after collision. Before collision

After collision

10

Figure 7 (a)

Figure 7 (b)

a) State the principle of conservation of momentum. ________________________________________________________________ [1 mark] b) Calculate total momentum before collision.

[2 marks] c) Calculate the velocity of the boy and girl after collision.

[3 marks] d) Is the collision between the boy and girl elastic? Give reason for your answer. ________________________________________________________________ ________________________________________________________________ [2 marks]

8.



ceiling

11

Tin

water

M

N

hand P

Q

R (i)

Diagram 8.1

(ii)

a) Diagram 8.1(i) shows tin P that is empty and tin Q that is filled with water. A student find difficult to pushed tin Q. Write the inference about the observation. __________________________________________________________________ __________________________________________________________________ [2 marks] b) Diagram 2.1(ii) shows a tin being released from the different positions M and N. The hand of a student at position R needs greater force to stop the motion of the tin falling from position M. Explain this observation. __________________________________________________________________ __________________________________________________________________ [2 marks] c) Based on the observation (i) and (ii), state two factors that affect the magnitude of the momentum of the object. __________________________________________________________________ __________________________________________________________________ [2 marks] d) If water flows out from a hole at the bottom of the tin Q, how would the inertia of Tin Q depends on time? __________________________________________________________________ __________________________________________________________________ [2 marks]

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Section B [ 20 marks] Answer any one question from this section. The time suggested to complete this section is 30 minutes. 1. Figure 9 (a) shows the reading of an ammeter before any current is connected to it.

Figure 9(a) a) Explain the meaning of systematic errors. Give two examples of systematic errors. [5 marks] b) A student used the above ammeter to measure current in electrical circuit. Figure 9(b) shows the reading of the current from his experiment.

Mirror

Figure 9(b) i) There is a mirror near ammeter scale. Explain the function of the mirror. [4 marks] ii) Using Figure 9(a) and Figure 9(b), shows the steps to get the actual reading of the current. [4 marks] c) Suggest ways to improve the accuracy of measurement in any instruments used in the laboratory. [4 marks] d) Explain the meaning of the following

13 i) Consistency ii) Accuracy 2.

[3 marks] a) Two importance aspects are involved in the description of a physical quantity. What are these two aspects? [2 marks] b) i) What is the difference between base quantities and derived quantities? [2 marks] ii) Name the five base quantities and state their SI units. [5 marks] iii) State the unit of force in terms of base SI unit. [1 mark] c) List in correct order the steps involved in the process of scientific investigation. [10 marks] Section C [ 20 marks] Answer any one question from this section. The time suggested to complete this section is 30 minutes.

1.

Diagram 11 (a) shows two identical eggs being released from the same height onto two different surfaces.

Diagram 11 (a)

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Diagram 11 (b) shows the conditions of the egg after they hit the concrete floor and the sponge. It is observed that the egg stops faster when it hits the concrete floor.

Diagram 11 (b) a) i) What is meant by impulse? [1 mark] ii) Based on Diagram 11(a) and 11(b), compare the condition of the eggs, the surface of the concrete floor and the surface of the sponge and when the eggs hits the surfaces. Relate the change in the conditions of the eggs and the surfaces to deduce a relevant physics concept. [5 marks] b) Explain the change in energy that occurs from the point where the egg is released until it reaches the position in Diagram 11 (b). [4 marks] c) Alfian is the construction supervisor of a building under construction. He notices that carelessness may cause objects and even his workers to fall off the building and causes injuries and even death. To prevent this, Alfian wants to take precautions. Using the appropriate physics concepts, suggest and explain suitable ways and precautions that Alfian should take to: i) prevent falling objects from hitting his workers on the ground, ii) prevent injuries if his workers were to fall off the building. [10 marks]

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2.

a) The ticker-tape P, Q and R shown in the Diagram 12 (a) are produced by three trolleys pulling the tapes through a ticker timer operating at 50 Hz. i) Describe the motion represented by each of the tape P, Q and R. [6 marks]

Diagram 12 (a) ii) Find the average velocity of the trolley that produces tape P. [2 marks] iii) Find the average acceleration of the trolley that produces tape R. [3 marks] b) A bullet of mass 20 g is fired from 2 kg riffle with a velocity of 20 ms-1 towards 3 kg block of wood. The block of wood is suspended from the ceiling as shown in Diagram 12 (b)

Diagram 12 (b) i) Find the recoil velocity of the rifle. [3 marks] ii) Find the maximum height reached by the block of wood after the bullet is embedded in it. [3 marks] iii) Name the principle used in obtaining the answer to (b)(ii) [1 mark] iv) What energy changes occur when the bullet hits the block of wood? [2 marks]

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