MINISTRY OF EDUCATION AND HUMAN RESOURCES, TERTIARY EDUCATION AND SCIENTIFIC RESEARCH MAURITIUS EXAMINATIONS SYNDICATE NATIONAL ASSESSMENT AT FORM III NAME SCHOOL NAME CLASS/SECTION PHYSICS October 2016 1 hour Students answer on the Question Paper. The use of calculators is not allowed in this 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 in this paper. Answer all the questions. All answers must be written in the spaces provided. Show all your workings. Diagrams are not drawn to scale. 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. 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. Check that this document consists of 11 printed pages and one blank page. Any discrepancy in the document must be immediately notified to the responsible officer in your school.
2 Question 1 (5 marks) For each item below, there is ONLY one correct answer. Draw a circle around the letter which shows the correct answer. (a) Fig. 1.1 below shows a thermometer calibrated in degrees Celsius. Fig. 1.1 What is the reading shown on the thermometer? A 27 o C B 37 o C C 47 o C D 57 o C (b) Which one of the following examples in Column A describes the correct form of energy shown in Column B? Column A Column B A Energy due to the bonding in atoms and molecules Heat B Energy due to the vibrations of air when playing the flute Sound C Energy due to the position of person on a mountain Kinetic D Energy due to the flow of charges during lightning Chemical (c) Fig. 1.2 shows the picture of an electrical switch. push-button base contact Fig. 1.2 Which one of the following materials would you use to make the base, the contact and the push-button for the switch? Base Contact Push-button A Wood Brass Plastic B Wood Plastic Brass C Brass Wood Plastic D Plastic Wood Brass
3 (d) Which one of the following speed-time graphs below shows a car at rest? Speed / (m/s) Speed / (m/s) 0 time/s 0 time/s A B Speed / (m/s) Speed / (m/s) 0 time/s 0 time/s C D (e) Fig. 1.3 shows an empty glass placed in front of a striped wall. Why do the straight horizontal lines appear curved when viewed through the glass? A B C D Light is reflected by the glass. Light is blocked by the glass. Light is inverted by the glass. Light is refracted by the glass. Fig. 1.3 Please turn over this page
4 Question 2 (4 marks) A rope and a pulley are used to lift a bucket of bricks from the ground to the top of a building as shown in Fig. 2.1. Fig. 2.1 You want to find the increase in the potential energy of the bucket of bricks after it is lifted from the ground to the top of the building. By completing the table below, say (a) (b) (c) which two quantities you would need to measure. the unit in which you will measure each quantity. the instrument you would use to measure each quantity. Quantity Unit Instrument 1. 2. [4]
5 Question 3 (5 marks) During a science fair, Danny connects his bicycle to a motor as shown in Fig. 3.1. As he pedals his bicycle, one of the wheels turns the motor on. Fig. 3.1 Based on Figure 3.1, complete sentences (a) to (c), using the words from the list below. potential chemical heat electrical kinetic light (a) When Danny pedals the bicycle, energy in his muscles is transformed into energy and the motor rotates. This energy is converted into energy in the wires. (b) The energy in the wires is then transformed into energy as the bulb is switched on. (c) When the bulb is on, some of the energy in it is wasted as energy. [5] Please turn over this page
6 Question 4 (9 marks) (a) Below are some units of speed. snail m/s km/h mm/s Which of these units would be the most appropriate to state the speed of a snail crawling?. [1] Give a reason for your answer. (b) An airliner moving at a constant speed of 80 m/s accelerates uniformly to a speed of 190 m/s in 44s. Calculate the acceleration of the airliner. acceleration = [2] (c) A bus travels from Curepipe to Vacoas. During its journey, the bus reaches a maximum speed of 80 km/h. Its average speed between the two towns is 48 km/h. (i) Why is the average speed of the bus less than its maximum speed? [1] (ii) The bus takes 20 minutes to reach Vacoas. Calculate the distance between Curepipe and Vacoas. distance = [4]
7 Question 5 (9 marks) Fig. 5.1 below shows a simple electric circuit. 4.5 V 3 Ω P Q R S 5 Ω Fig. 5.1 (a) How are the two resistors in the circuit connected? They are connected in. [1] (b) Define the term potential difference. (c) State the value of the potential difference between Q and R. potential difference = [1] (d) Calculate the current in the 5 Ω resistor. current = [4] (e) State how the current flowing along PQ compares with 1. the current in each of the two resistors, [1] 2. the current flowing along RS. [1] Please turn over this page
8 Question 6 (5 marks) A student uses the equipment shown in Fig. 6.1 to determine the volume of a stone. He begins by pouring some water into the measuring cylinder. Fig. 6.1 (a) Write down the next step he should take. (b) Give one precaution he should take in the step you mentioned in part (a). (c) He then drops the stone carefully into the measuring cylinder. Why is it better to lower the stone into the measuring cylinder by using a piece of string? (d) What will he observe after dropping the stone into the measuring cylinder? (e) Explain how the student can find the volume of the stone.
9 Question 7 (5 marks) Fig. 7.1 shows a motorcycle moving past a car at rest in a car park. The mass of the motorcycle is 500 kg. It travels at a constant speed of 12 m/s. (a) Calculate the kinetic energy of the motorcycle. Fig. 7.1 kinetic energy = [2] (b) The mass of the car is three times that of the motorcycle. Two friends, Adi and Bala, make the following statements: Adi The car has more kinetic energy than the motorcycle. The motorcycle has more kinetic energy than the car. Bala (i) According to you, who is right, Adi or Bala? [1] (ii) Explain your answer. [2] Please turn over this page
10 Question 8 (8 marks) Fig. 8.1 shows a girl looking at her reflection in a mirror on the wall. Study Fig. 8.1 carefully and answer the questions which follow. mirror wall Fig. 8.1 (a) Draw a normal at O on Fig. 8.1. [1] (b) State the value of the angle of incidence at point O. angle of incidence = o [2] (c) On Fig 8.1, (i) complete the ray diagram. Use an arrow to show the direction of travel of the light, [1] (ii) label the ray diagram to show the incident and reflected rays, the angle of incidence (i) and the angle of reflection (r), [1]
11 (iii) use a double arrow ( ), to clearly mark the portion of the girl s body that she cannot see reflected in the mirror. Label this portion X. [1] (d) Suggest what could be done for the girl to be able to see the reflection of her whole body in the mirror? (e) One characteristic of the image formed by a plane mirror is that it is virtual. What do you understand by the term virtual? Please turn over this page
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