2012 Annual Examinations. Subject: Physics Time: 2 Hours. Teacher s Name: Mr GJ Zahra, Mr M Mallia No. of Pages: 11. Name & surname: Class: Year 9.

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2012 Annual Examinations Subject: Physics Time: 2 Hours Teacher s Name: Mr GJ Zahra, Mr M Mallia No. of Pages: 11 Name & surname: Class: Year 9. This paper consists of ten questions.

1 2012 Annual Examinations Subject: Physics Time: 2 Hours Teacher s Name: Mr GJ Zahra, Mr M Mallia No. of Pages: 11 Name & surname: Class: Year 9. This paper consists of ten questions. Each question carries a total of ten marks. Answer all questions in the space provided. Mark allocations are shown in brackets next to each question. Write down your Name, Surname and Class on all your answer sheets. You are requested to show all working and write down the units where necessary. You are reminded of the necessity of good English and orderly presentation of your work. In calculations, you are advised to show ALL the steps in your working. Where necessary, take g, acceleration due to gravity, to be 10 m/s 2. Below is a set of formulae that you might find useful during the examination: Density Pressure Energy & Work Force Heat Item Max. Mark Actual Mark Lab Report Total Total % GJZ, MM Page 1 of 11 PHY Y9 EoY 2012

1. Peter investigates the densities of three different materials: copper, aluminium and modelling clay (plasticine). a. The copper block is 5cm wide, 5cm thick and 4cm high. Its mass is 890g.

2 1. Peter investigates the densities of three different materials: copper, aluminium and modelling clay (plasticine). a. The copper block is 5cm wide, 5cm thick and 4cm high. Its mass is 890g. Calculate the density of copper in g/cm 3. b. Peter finds that an aluminium block of the same volume has a density of 2.7 g/cm 3. Give one reason why aluminium and copper have different densities. (1) c. Peter observes that aluminium sinks when placed in water but floats on liquid mercury. Explain these observations. d. Peter tries to find the volume of modelling clay using the following apparatus in order to find its density i. Describe how the volume of modelling clay is measured (3) ii. Give two precautions Peter needs to take to measure the volume of modelling clay accurately GJZ, MM Page 2 of 11 PHY Y9 EoY 2012

2. The diagram shows an aluminium pan being heated on an electric burner. Food is being cooked in boiling oil in the pan. a. Name the process by which heat is transferred through the saucepan (1) b.

Of the gas above the boiling oil c. Give two reasons why the pan is made of aluminium d. Suggest a suitable material for the pan handle (1) e.

3 2. The diagram shows an aluminium pan being heated on an electric burner. Food is being cooked in boiling oil in the pan. a. Name the process by which heat is transferred through the saucepan (1) b. The figures show three different ways in which particles in a substance may be arranged. Indicate which figure best represents the arrangement of the particles: i. In the aluminium pan ii. Of the gas above the boiling oil c. Give two reasons why the pan is made of aluminium d. Suggest a suitable material for the pan handle (1) e. Calculate the heat energy needed to raise the temperature of the 300g pan from 25 C to 100 C if the specific heat capacity of aluminium is 900 J/kg C. f. Why are solar panels and the radiator at the back of a refrigerator both painted black? GJZ, MM Page 3 of 11 PHY Y9 EoY 2012

4 3. The diagram below shows the beads on a Newton s Cradle a. What is the main type of energy that the beads have at points i. A: (1) ii. B: (1) b. The mass of each bead is 0.05kg. Calculate its potential energy at point A. c. What is the kinetic energy of the bead at point B? (1) d. Calculate the velocity of the bead at point B. e. When the bead hits the other beads at B, a bead from the other side moves up and reaches a height of 4.7cm. i. State the principle of conservation of energy ii. Why does the bead not reach a height of 5cm in practice? GJZ, MM Page 4 of 11 PHY Y9 EoY 2012

4. Monica drops a ball from a height above the ground. a. On the diagram below draw and name the forces acting on the ball as it is accelerating downward (3) a. If the ball has a mass of 0.

5 4. Monica drops a ball from a height above the ground. a. On the diagram below draw and name the forces acting on the ball as it is accelerating downward (3) a. If the ball has a mass of 0.35 kg, calculate the downward force acting on the ball. b. Using your answer in (a), calculate the resultant force acting on the ball if the upward force is 1.5N (1) c. Monica then drops the same ball along a rough slope. Explain in terms of forces why the ball takes more time to reach the ground. d. Explain what is meant by the term centre of gravity. GJZ, MM Page 5 of 11 PHY Y9 EoY 2012

6 5. A crane transports a 500kg mass from ground level up to an 80m sky scraper. The work done by the crane in lifting the load is measured and calculated every 20m Work Done W (kj) Height h (m) a. Plot a graph of the Work Done W (kj) on the y-axis against Height h (m) on the x-axis (4) b. Use the graph to obtain the value of the work done by the crane in lifting the mass to a height of 70m. Mark this point clearly on your graph with an X. c. Calculate the slope (gradient) of the graph, giving your answer in J/m. d. Using the value obtained in (c), or otherwise, calculate a value for the gravitational acceleration in the formula: GJZ, MM Page 6 of 11 PHY Y9 EoY 2012

6. This question is about pressure and its uses. a. John traps some air inside a syringe. He closes the open end with his thumb and pushes in the piston. State what happens to the air s: i.

7 6. This question is about pressure and its uses. a. John traps some air inside a syringe. He closes the open end with his thumb and pushes in the piston. State what happens to the air s: i. Volume: ii. Mass: iii. Density: iv. Pressure: (4) b. Waste paper is sent to a recycling plant. The diagram shows a hydraulic press used to crush waste paper. i. The piston Y has an area of 0.5 m 2. Calculate the pressure exerted when the handle is pushed in with a force of 50N. ii. What is the value of the pressure at X? iii. Work out the value of the force with which the piston X crushes the paper if the area of piston X is 2.0 m 2. iv. Give one reason why oil is used instead of water as a hydraulic fluid. GJZ, MM Page 7 of 11 PHY Y9 EoY 2012

8 7. This question is about energy sources a. State the difference between renewable and non-renewable sources of energy. b. Classify the following energy sources as renewable or non-renewable Solar energy Fossil fuels Biomass fuels Nuclear energy Renewable Non-Renewable c. Select one energy source from the ones listed above and give one advantage and one disadvantage of using such source in Malta d. At the Power Station in M Xlokk, oil is burnt to turn the turbines in order to generate electricity. Fill in the energy conversions in the flow chart drawn below stating the type of energy in: (4) GJZ, MM Page 8 of 11 PHY Y9 EoY 2012

8. The Earth is one of the eight planets in orbit around the sun in what is known as the solar system a. Which planet in the solar system has the shortest year? Explain. b.

9 8. The Earth is one of the eight planets in orbit around the sun in what is known as the solar system a. Which planet in the solar system has the shortest year? Explain. b. Give one reason why Pluto was officially removed from being one of the planets of our solar system (1) c. In 1609, Galileo Galilei, an Italian scientist, performed the first observation of the planets using a telescope of only 4 cm in diameter. He observed the distant planet Jupiter and discovered four faint dots around this planet. i. Suggest what the four faint dots around Jupiter might be. ii. Name the force that keeps these dots in orbit around Jupiter. iii. Is the average surface temperature on Jupiter colder or warmer than that on Earth? Give one reason for your answer. d. The Ursa Major galaxy is 1 x 10 9 light years away from us. If light travels with a speed of 3 x 10 8 m/s, calculate the distance of the galaxy from Earth. Give your answer in standard form. (3) GJZ, MM Page 9 of 11 PHY Y9 EoY 2012

10 9. Isaac attaches a weight of 2N to a spring. a. What can be attached to the spring to make readings of length easier to take? (1) b. Describe how Isaac finds a value for the extension produced on the spring. (3) c. Isaac attaches more masses to the spring and measures the extension for each mass added. Sketch the shape of the graph he obtains when the force applied is plotted against the extension. Assume the elastic limit is not exceeded. (2) d. On the same axis used in (c), sketch the graph obtained if Isaac uses a stiffer spring. Label this graph S. (1) e. Explain why the shapes of the graphs are different. f. What happens to the graph in (c) if the elastic limit is exceeded? (1) GJZ, MM Page 10 of 11 PHY Y9 EoY 2012

11 10. The diagram below shows a uniform trapdoor of mass 2kg held horizontal by a vertical copper wire fixed to a point as shown a. What is the weight of the trapdoor? b. On the diagram, i. Draw the weight acting on the trapdoor (2) ii. Draw the tension force acting on the copper wire (1) c. Taking moments about the pivot, calculate i. The clockwise moment ii. The anticlockwise moment iii. The size of the force acting on the copper wire End of physics examination! Go back and check your work! GJZ, MM Page 11 of 11 PHY Y9 EoY 2012

YEAR 9 PHYSICS TIME: 2 hours

DIRECTORATE FOR QUALITY AND STANDARDS IN EDUCATION Department of Curriculum Management Educational Assessment Unit Track 3 Annual Examinations 2017 YEAR 9 PHYSICS TIME: 2 hours Name: Class: INFORMATION