YEAR 11 PHYSICS TIME: 2 hours

DIRECTORATE FOR QUALITY AND STANDARDS IN EDUCATION Department of Curriculum Management Educational Assessment Unit Annual Examinations for Secondary Schools 2017 Track 2 YEAR 11 PHYSICS TIME: 2 hours Name: Answer ALL questions in the spaces provided on the Examination Paper. All working must be shown. The use of a calculator is allowed. Where necessary take the acceleration due to gravity g = 10 m/s 2. Density m = ρ V Pressure P = ρ g h F = P A Class: Moments Energy Moment = F perpendicular distance PE = m g h KE = 1 2 mv2 Work Done = F s Work Done = Energy Converted E = P t Force F = m a W = m g Motion Electricity total distance (u + v) t Average Speed = total time s = s = ut + 1 2 2 at2 v = u + at v 2 = u 2 + 2as Momentum = m v Q = I t V = I R E = Q V P = I V R L/A E = I V t R T = R 1 + R 2 + R 3 1 R T = 1 R 1 + 1 R 2 Electromagnetism Heat Waves Radioactivity N 1 N 2 = V 1 V 2 ΔQ = m c Δθ real depth η = apparent depth v = f λ f = 1 T A = Z + N η = the speed of light in air the speed of light in medium m = h i image distance = h o object distance Marks Grid: For the Examiners use ONLY Question 1 2 3 4 5 6 7 8 9 10 11 12 Th. Prac Total Final Mark Mark 10 10 10 10 10 10 10 20 20 20 20 20 170 30 200 100 Score Physics Year 11 Secondary Track 2 2017 Page 1 of 13

Section A: This section has 7 questions. Each question carries 10 marks (70 marks). 1. A student hangs an iron block to a stand and clamp as shown in Figure 1. a) Name the apparatus X that is used to measure X the weight of the iron block. 12 N [1] b) Draw and label the forces acting on the iron block in Figure 1 (a). [2] c) The student lowers the iron block in a measuring iron block cylinder as in Figure 1 (b). The liquid in the measuring cylinder rises from 50 cm 3 to (a) Figure 1 (b) 203 cm 3. i) Calculate the volume of the iron block. ii) The weight of the iron block is 12 N. Calculate its mass in grams. iii) Determine the density of the iron block [3] 2. Nicole uses a computer simulation to determine the weight of steel blocks with different masses on the moon. She presents the data as shown in the graph of Figure 2. a) Weight is a vector quantity. Define a vector quantity. [2] b) Nicole reads the weight of the 3 kg mass incorrectly. Use the graph to find the correct value of the weight of the 3 kg mass. [1] Figure 2 Page 2 of 13 Physics Year 11 Secondary Track 2 2017

c) Determine the acceleration due to the gravity on the moon by finding the gradient of the graph. [3] d) What is the relationship between the weight W and the mass m? Give a reason for your answer. e) Nicole repeats the same simulation using a smaller value of the gravitational acceleration. On the same graph of Figure 2, sketch the new line graph that she obtains. [2] 242 3. Plutonium-242 (Pu-242) is a silvery radioactive solid. The symbol for plutonium-242 nucleus is 94Pu. a) Table 1 i) Underline the correct term: When radioactive decay occurs, a nucleus which is (unstable, stable, unchanging) decays to a more stable nucleus by emitting radiation. [1] ii) The proton number Z of Pu-242 is. [1] iii) Calculate the neutron number N of Pu-242.. [1] b) Table 1 shows the properties of the three types of radiation. Complete the table, by filling in the types of radiation. Nature Electromagnetic wave Particle Particle Nucleon Number A none 0 4 Proton Number Z none -1 2 Type of Radiation c) The activity of a sample of Iodine-131 drops from 8000 counts per minute to 500 counts per minute in 32 days. Calculate the half-life of the sample of iodine. [4] [3] 4. Two conducting metal spheres L and M are on insulating stands. L and M are positively charged. a) What is the difference between conducting and insulating materials? L + + (a) M L M [2] Physics Year 11 Secondary Track 2 2017 Page 3 of 13 (b) Figure 3

b) The charge on Sphere L is 0.0042 C while that on Sphere M is 0.0035 C. The spheres are placed in contact with each other. What is the net final charge on both spheres? [3] c) The spheres are earthed by touching them (see Figure 3b). The net charge found in question 4 b) flows between the spheres and earth in 0.01 s. Calculate the current flow. [3] d) Explain, in terms of the movement of electrons, what happens to the charge on the spheres when they are earthed. 5. Johnny is splitting wooden logs for the stove. He uses the setup shown in Figure 4. The total mass of the blade and the rod is 3 kg. a) The contact area between the blade and the log is 0.0002 m 2. Calculate the pressure exerted by the rod and blade on the log. [3] b) Johnny adds a sliding mass to the rod. He releases the mass and it hits the blade, exerting an extra force of 80 N. Calculate the maximum pressure exerted by the system. Figure 4 [4] c) Without changing the blade, state TWO ways how Johnny can increase the pressure exerted on the log. d) After several uses, the blade becomes blunt (less sharp). How will this affect the pressure exerted by the blade? [1] Page 4 of 13 Physics Year 11 Secondary Track 2 2017

6. Figure 5 shows a bar magnet being pulled out of the solenoid. N S C D Figure 5 a) i) Underline the correct term: In electromagnetic induction, (Faraday s, Lenz s, Snell s) law states that when the rate of cutting of magnetic flux increases, the induced current flowing through the solenoid increases. [1] ii) The magnet is pulled away from the solenoid. State the magnetic pole that is induced at end C of the solenoid. iii) In which direction will the needle on the galvanometer deflect as the magnet is pulled away from the solenoid? b) Part AB of the graph in Figure 6 shows how the current changes as the magnet is moved inside the solenoid. i) Which section of the graph shows that the magnet stopped moving inside the solenoid? Explain. A B C D [3] ii) State what is observed on the galvanometer during section CD of the graph. Explain. Figure 6 iii) The same procedure is repeated using a weaker magnet. On the same graph, sketch a curve that represents the induced current by this weaker magnet. [2] Physics Year 11 Secondary Track 2 2017 Page 5 of 13

7. An asteroid is orbiting the Sun as shown in Figure 7. a) In which of the positions, A, B, C or D is the effect of the Sun s gravity on this asteroid greatest? Explain. [2] b) Table 2 gives information about three of the planets in our solar system. Table 2 Figure 7 Planet Average distance from sun ( 10 9 m) Time for one orbit (Earth years) Average surface temperature ( C) Venus 105 0.62 400 Mars 225 1.88-55 Neptune 4515 165-200 i) Use information in the above table to help you explain how the surface temperature of these planets varies with distance from the Sun. ii) Calculate how many Earth days there are in ONE year on Mars. iii) Calculate the time taken for light rays from the Sun to reach planet Neptune if the speed of light is 300 000 000 m/s. iv) Name ONE benefit of space exploration. v) Name ONE unanswered question about the universe. Page 6 of 13 Physics Year 11 Secondary Track 2 2017

Section B. This section has 5 questions. Each question carries 20 marks (100 marks). 8. This question is about light and its properties. a) Underline the correct answers in brackets. i) Light travels at (3 000, 3, 300 000 000) m/s. [1] ii) Light waves are (transverse, longitudinal, mechanical). [1] b) Figure 8 shows an archer fish. It hunts insects by shooting them with water from its mouth. i) Where would the fish see the insect? Mark this position with an X. [1] ii) Label the angle of incidence i and the normal on Figure 8. [2] iii) Underline the word that describes the effect of light shown in Figure 8. (Reflection, Refraction, Diffraction). [1] insect air water Archer fish Figure 8 c) Britney investigates the relationship between the image distance and magnification of a convex lens as shown in Figure 9. She tabulates her results as shown Table 3. illuminated object object distance lens image distance screen Figure 9 Table 3 Image distance (cm) 2 4 6 8 10 12 Magnification 1 3 5 7 9 11 i) Write the order of the steps followed to carry out the experiment. The first one is done for you. She measures the object and image distances with a metre ruler. She repeats the experiment for different object distances. She sets up the apparatus as shown in the diagram. 1 She moves the convex lens until she sees a sharp image on the screen. [3] ii) On the graph paper provided, plot a graph of image distance (cm) on the y-axis against magnification on the x-axis. Draw the best straight line through your points. [5] Physics Year 11 Secondary Track 2 2017 Page 7 of 13

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d) Figure 10 shows a convex (converging) lens of focal length of 2 cm. An object O is placed 3 cm away from the centre of the lens. The diagram is to scale. convex lens O Figure 10 i) What is the height of the object O? [1] ii) Draw two rays of light from the top of object O that pass through the lens to show where they meet. [2] iii) Draw the image that forms. [1] iv) Is the image that forms real or virtual? [1] v) Is the image that forms magnified or diminished? [1] 9. This question is about electromagnetism and its applications. a) Draw the magnetic field for each of the following diagrams. cardboard copper wire solenoid (i) (ii) [2] [3] Physics Year 11 Secondary Track 2 2017 Page 9 of 13

b) Mention ONE use for an electromagnet. c) When the switch is closed, the copper rod shown in Figure 11 starts rolling. powerful magnet copper rod aluminium rod switch battery Figure 11 i) On Figure 11, draw an arrow to show the direction of the current I in the copper rod. [1] ii) The direction in which the rod rolls can be found by using Fleming s left (grip, leaning, hand) rule. [1] iii) On Figure 11, draw an arrow to show the direction in which the copper rod rolls. [2] iv) State what happens to the speed of the rod in each of the following situations: Another battery is added in series. [1] The magnet is replaced by a stronger one. [1] The copper rod is replaced by a heavier one. [1] v) State ONE way to make the copper rod roll in the opposite direction. vi) What will happen if the copper rod is replaced by a plastic rod? Give a reason for your answer. d) A device called a solenoid valve is represented in Figure 12. The iron rod, plunger and plug are connected together and can move vertically upwards or downwards. Fill in the blanks by using iron rod coil switch d.c. supply + - some of the following words: voltage, attracts, down, repels, upwards, current When the switch is closed, plug water out spring (fixed) hole plunger water in flows through the coil. The coil forms a magnetic field and the iron rod. The Figure 12 plunger moves and water is able to flow. [3] Page 10 of 13 Physics Year 11 Secondary Track 2 2017

10. This question is about energy and motion. a) Paul wants to join the army. His physical fitness is tested by climbing a flight of steps in the shortest time possible. His mass is 60 kg. i) Find Paul s weight. [2] ii) Fill in the blanks from the following choice of words: kept, destroyed, created, invented Energy can neither be nor, but can be changed from one form to another. [2] iii) Find the gravitational potential energy he gains when he goes up 1.5 m. iv) Calculate his power if it takes him 2.5 s to go up 1.5 m. [3] v) Paul feels hot after climbing the stairs. How does his body try to keep him cool? b) He is ordered to jog at constant velocity. i) Underline the correct word: According to Newton s (first, second, third) law of motion, as Paul jogs at constant velocity there is no resultant force. [1] ii) Calculate his speed if he travels 480 m in 80 s. [3] c) Another test consists of firing a bullet. Each bullet has a mass 0.02 kg and travels at a speed of 300 m/s. i) Applying the principle of conservation of momentum to Paul and the rifle: the total momentum of Paul and the rifle before firing is (greater than, equal to, smaller than) the total momentum of Paul and the rifle after firing the bullet, if there is no resultant force acting. [1] ii) What is the total momentum of Paul and the rifle before firing a bullet, when he is not moving? iii) Calculate momentum of the bullet when it is fired. iv) What is the momentum of Paul and the rifle just after firing the bullet? Physics Year 11 Secondary Track 2 2017 Page 11 of 13

11. This question is about methods of heat transfer. board Miss Mifsud shows her students the apparatus in Figure 13. It consists of a heat resistant plastic board held vertically by means of two stands. An electric heater is fixed at the centre and three temperature sensors A, B and C are installed at the same distance from the heater. The heater is switched on and the temperature of each sensor is measured at two minute intervals for ten minutes. Figure 13 a) The results are plotted as shown. Label correctly each graph obtained for sensors A, B and C. b) The room temperature = C [1] c) Underline the correct answers: i) Heat travels from the heater to all the sensors mostly by (conduction, convection, radiation). [1] ii) Since plastic is an insulator, it will reduce heat transfer by (conduction, convection, radiation). iii) The sensors are black because dark objects are better (absorbers, emitters) of heat. [1] iv) Heat travels through liquids and gases mostly by (conduction, convection). [1] d) The following materials are either conductors or insulators: copper, wood, cotton, gold Write each material in its correct column in the table on the right. Page 12 of 13 Physics Year 11 Secondary Track 2 2017 [3] [1] Table 4 e) Miss Mifsud has a very hot cup of tea. She wants to cool it. Describe TWO different ways of doing this. A Temperature 50 B ( C) 45 40 35 30 heater 25 20 C 15 10 5 stands 0 Conductors [4] f) Name TWO different ways to reduce heat losses from a home during winter. 0 2 4 6 8 10 12 time /(minutes) Insulators [4] [4]

12. This question is about electricity. a) Add arrows to link the components to their symbols and their functions (what they do). Component Symbol Function Diode Thermistor LDR b) A student set up the circuit shown in Figure 14. Its resistance varies with light intensity Allows current to flow in one direction only Its resistance decreases as temperature rises [4] Figure 14 i) On Figure 14, label the instruments that measure current and voltage. [4] ii) Label the variable resistor in the circuit. [1] iii) Number the order of the method used to carry out the experiment. The first one is done for you. Measure the current and the voltage and tabulate your results Plot a graph of current on the y-axis against voltage on the x-axis Close the switch and adjust the variable resistor Repeat until you have 5 measurements of current and voltage Set up the apparatus as shown 1 iv) The graph is a straight line through the origin. Mark each statement below as True or False. Current and voltage are directly proportional. (True, False) [1] The resistance of the metal wire is constant during the experiment. (True, False) [1] The temperature of the metal wire increases during the experiment. (True, False) [1] The wire does not obey Ohm s law. (True, False) [1] v) Calculate the resistance of the metal wire when the current flowing through it is 0.5 A and the voltage across it is 2 V. [3] [4] Physics Year 11 Secondary Track 2 2017 Page 13 of 13