Contoh Soalan Program Puncak Usaha Spm 2011 (Fizik)

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Examples: Questions in Paper 1 Physics

1. The figure below shows the displacement-time graph of a particle.

Which of the following is correct? A Its velocity is constant. B Its velocity is increasing. C Its velocity is decreasing. D Its acceleration is decreasing

Answer B The gradient of the graph is increasing. The velocity also is increasing

2. A tall can with three equal size holes are drilled in the side. When the tall can is filled with water, water squirts out from the three holes as shown in the diagram below.

This observation shows that A liquid pressure acts in all directions. B liquid pressure increases with depth. C liquid pressure decreases with depth. D liquid pressure is independent of depth. Answer B Liquid pressure, P = hpg h = depth p = density of the liquid g = gravitational accelerations P h When depth increase, liquid pressure increase

3. What is the range of frequency which can be heard by a normal adult?

A B C D

6 Hz to 200 Hz 60 Hz to 70,000 Hz 60 Hz to 20,000 Hz 60 Hz to 200,000 Hz

Answer C Normal audible range: 20 Hz to 20, 000 Hz

Examples: Questions in Paper 2 Physics

1. The figure below shows the current-time graph for an alternating current, which changes in a sinusoidal manner.

a)What is the period of oscillation? b)What is the frequency of the alternating current? c)What is the value of the peak current for the alternating current?

a) What is the period of oscillation? Answer: 0.02 s (Period is The time taken for an oscillation to complete one cycle.)

a) What is the value of the peak current for the alternating current? Answer: 5 A (Amplitude (A) is the maximum displacement from its equilibrium position. )

2. Diagram below shows a portable ice cream container that can keep the ice cream inside the container. The container is able to maintain the temperature of the ice cream for a long time.

Table below shows the features of materials which could be used to make the ice cream container. Material Density / Specific heat Melting Thermal capacity 3 kg m 1C1 point / C conductivity / J kg A 4000 780 2000 High B 2500 650 1300 Low C 1000 1415 250 Low D 900 1528 30 Low E 2800 620 945 High

You are required to investigate the features of the materials in table above which could be used to make the ice cream container in Diagram above. Explain the suitability of each feature in table above. Select the most suitable material to be used in making the ice cream container. Give a reason for your choice.

The suitability of Reason feature Thermal conductivity heat transfer between the box must be low interior and the exterior surrounding is low. Melting point must It wont melt easily be high The density must be The container is lighter low The specific heat the temperature change is capacity must be high smaller The most suitable material to be used in making the ice cream container is material C.

Examples: Questions in Paper 3 Physics

1. An experiment is carried out to investigate the relationship between pressure (P) and volume (V) of a fixed mass of gas at constant temperature. The results are expressed in the form of a graph as shown in Figure (a).

(a) (i) What is the relationship between P and V of the gas shown in Figure (a)?

(ii) Name the law that governs the relationship in (a)(i). (iii) Sketch the graph of P against V.

Answer: (ii) Boyle s Law

(iii)

(b)

Based on the graph in Figure (a), calculate the gradient of the graph, k.

Figure (a) shows the arrangement of the apparatus used to calibrate a resistance thermometer. The resistance of the tungsten coil is measured by an ohmmeter over a wide range of temperatures. The results are shown in Figure (b).

(a) State (i) the manipulated variable: Temperature, T (ii) the responding variable: Resistance, R (iii) the constant variable: Length of tungsten coil

(b)Explain why (i)tungsten is chosen (ii)the tungsten coil is not directly immersed in water.

Answers: (i)Its melting point is very high (ii) Water is a conductor of electric current (pure water is not)

Based on the graph in Figure (b), What is the relationship between the wire resistance, R and the temperature, T?

Answer: (Choose 1 answer below) R is increase linearly with T // R increases when T increases // R = 0.024 T + 20.

2. Before commencing the journey to another town, a taxi driver checks his car tyre and it reads 220 kPa on the pressure gauge. When he reaches the town, due to temperature rise, the taxi driver checks his tyre reading and it measures 240 kPa. Diagram 2 shows the conditions of the car tyre before and after the journey.

Based on the information and observation: (a) State one suitable inference. (b)State one suitable hypothesis. (c) With the use of apparatus such as round-bottomed flask, Bourdon-gauge, beaker containing water, thermometer, Bunsen burner and others, describe one experiment to investigate the hypothesis stated in 2(b). In your description, state clearly the following; (i) The aim of the experiment. (ii) The variable in the experiment. (iii) The list of apparatus and materials. (iv) The arrangement of the apparatus.

(v) Procedure of the experiment which should include one method of controlling the manipulated variable and one method of measuring the responding variable. (vi) The way you tabulate the data. (vii) The way you analyse the data..

Answer a)The temperature influences the pressure of air in the tyre. b)The higher the temperature, the higher the pressure. c)(i) To investigate the relationship between the temperature and the pressure of air. (ii) Manipulated variable: Temperature of air Responding variable: Pressure of air Constant variable: Volume of air (iii) Bourdon gauge, round-bottomed flask, thermometer, water bath, Bunsen burner

(iv)

(v) 1. The initial temperature is measured by thermometer at 0 C. 2. The initial pressure, P is measured by Bordon gauge. 3. The experiment is repeated at least 6 times for different temperatures and pressures.

(iv)

/C 0 10 20 30 40 50 60

P/Pa

(vii) Graph P against T is plotted.