SHATIN TSUNG TSIN SECONDARY SCHOOL Final Examination Physics. S3 Date :

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1 Final Examination - S3 hysics.1/1 SHATIN TSUNG TSIN SECNDARY SCHL Final Examination hysics S3 Date : Total marks : 70 marks Time allowed : 1 hour Section A : (Multiple Choice, 20 marks) There are 20 questions in this section. Each question carries equal mark. Answer ALL questions in the Multiple Choice Answer Sheet provided. Mark the best answer only. Two or more answers will score no mark. 1. David Beckham( 碧咸 ) struck a penalty kick in a world cup match against Argentina. The penalty spot is about 3.66 m from the goal. The ball went into the goal in 0.3 second. The average speed of the ball struck by David Beckham is about : A km hr -1 B km hr -1 C km hr -1 D km hr The moon orbits ( 環繞 ) around the Earth once in 27.3 days along a circular path of radius 3.84x10 8 m. The average speed of the moon is about A x 10 2 m s -1 B x 10 3 m s -1 C x 10 7 m s -1 D x m s Laser beam can be used to measure the distance between two objects. The laser beam travels to the object and reflects back to the device. A workman measured a very far away building using laser beam. The laser beam is received 130 µs after it is emitted. The speed of Laser beam is 3x10 8 m/s. The building is located at A. 2.3 x 10 9 km away B x 10 9 km away C. 3.9 x 10 1 km away D x 10 1 km away The following graphs are for uestions 4 and 8 A. B. 0 0 C. D. 0 0

2 Final Examination - S3 hysics.2/2 4. Which graph represents a directly proportional relationship between two quantities? 5. Which graph cannot be a distance-time graph? 6. Which graph best describes the relationship between Current and voltage for a material which obeys hm's Law? 7. Which graph represents a graph of displacement against time of an accelerated linear motion? 8. Which graph represents the following motion? A man walked around a pond in a constant speed forward for 5 minutes and stopped for 3 minutes. For uestions 9-11 The following label is seen in an electric device. ower rating : 220 V, 50 Hz 1600 W Efficiency 83%. 9. The resistance of the device is A. 4.4 ohms B. 7.3 ohms C ohms D ohms 10. When the device is in operation, the current drawn is A. 4.4 A B. 7.3 A C A D A 11. How much energy is supplied to the device when it has been used for 1 hour? A MJ B. 792 KJ C. 180 KJ D. 11 KJ 12. Which of the following physical quantities is/are in unit of V? i) Current ii) Electromotive force iii) otential difference A. i) only B. iii) only C. i) and ii) only D. ii) and iii) only

3 Final Examination - S3 hysics.3/3 uestions refer to the following graph which is a graph of velocity against time of a sprinter running in a 100-metre race. 13. What is the average acceleration in the first 3 seconds? A. 36 ms -2 B. 12 ms -2 C. 6 ms -2 D. 2 ms How many seconds does the sprinter needed to finish the 100-metre race? A. 6 s B. 7 s C s D. 12 s 15. The following table is a truth table for an electronic device with two inputs, and one output Which of the following combinations of electronic gates will have the same truth table? A. B. C. D.

4 Final Examination - S3 hysics.4/4 uestions refer to the following truth table of three inputs, and R. R In a Karnaugh map for the above truth table, the least number of modules is A. 1 B. 2 C. 3 D In the final circuit block, at least, how many AND gates and R gates are needed? AND R A. 3 3 B. 3 4 C. 4 3 D In the following resistor network, all resistors have the same resistance R. Which of the following resistor networks will have the total resistance of R? A. B. C. D. 19. In the following circuit, all resistors have the same resistance, R. Which ammeter will have the same reading with the switch opened? A1 A2 A3 A. A1 and A3 B. A2 and A3 C. A1 and A2 D. A1, A2 and A3

5 Final Examination - S3 hysics.5/5 20. Complete the following paragraph about a description of a digital system. When some logic (1) are connected together to form a circuit, the completed set up is called a (2) or digital system. A digital system is used to process or store date. We use different (3) combinations to represent data in a digital system. (1) (2) (3) A. circuit digital circuit gate B. gates control system voltage C. voltage control system gate D. gates digital circuit voltage Section B : (Short uestions, 20 marks) There are 5 questions in this sections. Answer ALL questions in the answer sheet provided. 1. In the following table, write the two differences and two similarities between distance and displacement. (4 marks) Differences Distance Displacement Similarities 2. Given the following graph of voltage against current of a material, X, what is the resistance of the material, X? (2 marks) Voltage /V The graph of V oltage against C urrent C urrent /A 3. In the circuit on the right, three air-conditioners with different power ratings are connected parallel to each other. Some parameters are measured and shown in the circuit. i) What is the total current drawn from the power supply. (2 marks) ii) What is the total resistance of the circuit? (2 marks) 20 Ω, 220 V 8 A, 27.5 Ω 10 A, 22 Ω

6 Final Examination - S3 hysics.6/6 4. James turned on a heater for 5 hours. The power supply is 220 V and a current of 5A passed through the heating device. i) How many charges will go through the device in 5 hours? (2 marks) ii) What is the power of the device? (2 marks) iii) What is the total energy dissipated? (2 marks) 5. Michael Johnson completed a 400 m race in s. He ran in the first lane. i) What is his average velocity? (2 marks) ii) What is his average speed? (2 marks) Section C : (Long questions, 30 marks) There are 3 questions in this section. Answer ALL questions in the answer sheet provided. 1. The following graph shows the displacement -time graph of a car during its first 1.5 seconds in a Grand rix car race The graph of displacement against time displacement/m time/s i) Describe in details the above displacement-time graph. (5 marks) ii) In which time interval did the car accelerate? (1 mark) iii) What is the fastest speed of the car? (2 marks) iv) What is the average acceleration during the period of acceleration? (2 marks)

7 Final Examination - S3 hysics.7/7 2. The following ticker tape was obtained in studying the acceleration due to free falling and is divided into 4 portions. Each portion has the same time interval. The ticker tape timer operated at 50Hz cm cm 24.2 cm cm i) Complete the following table: ortion No ii) Time interval /s Distance travelled with the time interval /cm Average speed within each time-interval /ms -1 (4 marks) n the graph paper provided in the answer sheets, plot a graph of speed against time. (6 marks) iii) Find the average acceleration due to free falling. (3 marks) 3. The following Karnaugh map includes 4 inputs (,,R and S) and 1 output (). RS i) n the answer sheet, circles the Karnaugh map appropriately. ii) Draw on the answer sheet the simplest final circuit block. (2 marks) (5 marks) - End of aper -

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