MINISTRY OF EDUCATION AND HUMAN RESOURCES MAURITIUS EXAMINATIONS SYNDICATE NATIONAL ASSESSMENT AT FORM III NAME SCHOOL NAME CLASS/SECTION PHYSICS October 2013 1 hour Students answer on the Question Paper. Additional Materials: Mathematical set Ruler READ THESE INSTRUCTIONS FIRST Write your name, the name of your school and your class/section in the spaces provided above. Write in dark blue or black ink. You may use a soft pencil for any diagram, graph or rough working. Any rough working should be done in this booklet. Do not use correction fluid. There are 8 questions on this paper. Answer all questions. All answers must be written in the spaces provided. Show all your workings. Give all your answers using appropriate units wherever applicable. You may assume g = 10 m/s 2. You may also assume that 1 kg weighs 10 N. Diagrams are not drawn to scale. The number of marks is given in brackets [ ] at the end of each question or part question. The total of the marks for this paper is 50. This document consists of 12 printed pages and 2 blank pages.
1. For each of the items (a) to (e) below, there is one correct answer. Encircle the letter which shows the correct answer. 2 (a) The S.I. unit used to measure power is the. A kilogram B watt C newton D metre (b) A kettle is switched on to boil water. Which energy change occurs? A Electrical energy to chemical energy B Heat energy to chemical energy C Heat energy to electrical energy D Electrical energy to heat energy (c) In which of the following circuits will the lamps not light? A B C D
3 (d) In which of the following diagrams is the path of the light ray correctly drawn? A B Plane mirror Air Water C D Plane mirror Air Water (e) A car is moving at a constant speed. Which one of the following statements is true? A The acceleration of the car is zero. B The acceleration of the car is increasing. C The speed of the car is zero. D The speed of the car is increasing. [5] [Total Question 1 = 5 marks]
2 (a) Gary uses the apparatus in Fig. 2.1 to find the volume of a stone. 4 125 beaker water ball of string 100 75 50 25 measuring cylinder stone Fig. 2.1 The sentences below describe the procedure which Gary follows, but they are not in the correct order. A: Attach the stone using a piece of string. B: Record the new volume of water in the cylinder. C: Pour 75 cm 3 of water in the measuring cylinder. D: Subtract 75 cm 3 from the volume recorded. E: Gently lower the stone into the measuring cylinder. F: Fully submerge the stone in the water. Write the correct order in the boxes. The first one has been done for you. C [3] (b) State two precautions which Gary should take when following the above procedure....[2]
5 (c) Fig. 2.2 below shows the bob of a simple pendulum moving between points P and Q. P Q Fig. 2.2 The bob moves from P to Q, and back to P, ten times in 9.36 s. What is the period of the pendulum? Period of pendulum = [2] (d) The width of a wooden block is measured using a vernier caliper as shown in Fig. 2.3 below. vernier caliper 0.5 cm 1.0 1.5 0 5 10 wooden block Fig. 2.3 What is the width of the wooden block? Width of wooden block = [3] [Total Question 2 = 10 marks]
6 3. Fig. 3.1 below shows an object placed at 6 cm from a plane mirror. Plane mirror object cm 7 6 5 4 3 2 1 0 1 2 3 4 5 6 7 cm Fig. 3.1 (a) Give one characteristic of the image formed by the plane mirror.. [1] (b) On Fig. 3.1 above, draw the image of the object formed by the plane mirror. [3] (c) The object in Fig. 3.1 is moved 2 cm towards the mirror. What is the distance between the new position of the object and its new image? Distance between new position of object and new image =.. [1] [Total Question 3 = 5 marks]
7 4. A child uses a periscope to look at an object found on the other side of a high wall as shown in Fig. 4.1. A magnified view of the cross-section of the periscope is shown in Fig. 4.2. High wall Fig. 4.1 Plane mirror, U 45 0 45 0 Light ray from distant object Plane mirror, V 45 0 45 0 Eye-piece Fig. 4.2 (a) Using a protractor, draw the normal at the point where the light ray from the distant object strikes the mirror U on Fig. 4.2. [2] (b) On Fig. 4.2, continue the ray of light to show how the light comes out of the eye piece of the periscope. Indicate the direction of the light ray with arrows. [2] [Total Question 4 = 4 marks]
5. Kate carries out an experiment to investigate which objects conduct electricity. She sets up a circuit as shown in Fig 5.1 below. 8 Z object Fig. 5.1 (a) Name an electric component which Kate can connect at Z to show whether a current passes through the circuit. [1] (b) What is the name given to describe an object which does not conduct electricity?. [1] (c) Kate uses her circuit to test various objects. Tick ( conducts electricity. ) the box beside each object which A wooden half-metre rule Graphite lead of a pencil An uncoated paper clip A piece of nylon string [2] [Total Question 5 = 4 marks]
6 Fig. 6.1 shows the values of various electrical quantities in a circuit. 9 12 V 2 A 4 Ω Fig. 6.1 (a) Calculate the potential difference across the 4 Ω resistor. Potential difference across the 4 Ω resistor = [2] (b) Calculate the total resistance of the circuit. Total resistance = [3] [Total Question 6 = 5 marks]
7. Two athletes, Jane and Mary, run a 200 m race. Fig. 7.1 below shows the speed-time graph for the two athletes. 10 Study Fig. 7.1 carefully and answer the questions which follow. Speed/(m/s) Mary 10 Jane 0 5 10 15 20 25 Time/(s) Fig. 7.1 (a) (i) Which one of the athletes has the greater acceleration?.. [1] (ii) Explain your answer to part (a)(i). [1] (b) (i) Which one of the athletes wins the race?.. [1] (ii) Explain your answer to part (b)(i). [1]
11 (c) Jane reaches a speed of 10 m/s at t = 8 s as shown in Fig. 7.1. Calculate her acceleration between t = 0 s and t = 8 s. Acceleration of Jane = [2] (d) On the speed-time graph in Fig. 7.1, shade the region representing the distance covered by Jane during the time that she moves with constant speed. [1] (e) Calculate the distance covered by Jane during the time that she moves with constant speed. Speed of Jane =.. [2] [Total Question 7 = 9 marks] Please turn over this page
8. Ben has a mass of 50 kg. Fig. 8.1 shows Ben playing on a swing. 12 1.80 m ground level Fig. 8.1 Ben reaches a maximum height of 1.80 m above the ground at point X. (a) What main form of energy does Ben have at point X? [1] (b) What happens to the energy stated in (a) as Ben moves from X to Y? [2] (c) Calculate the amount of energy which Ben has at point X. Energy at point X = [2] (d) If the speed of Ben at Y is 5 m/s, calculate the amount of energy lost as Ben moves from X to Y. Energy lost =.. [3] [Total Question 8 = 8 marks]
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