SPINE ROAD HIGH SCHOOL VIA AD SUCCESSORUM

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1 SPINE ROAD HIGH SCHOOL VIA AD SUCCESSORUM DEPARTMENT OF SCIENCE PHYSICAL SCIENCE GRADE 11 JUNE EXAMINATION PAPER Time: 2 HOURS Total marks: 100 Examiner: Mr R Klein Moderator: Mrs A Fortune INSTRUCTIONS AND INFORMATION 1. Answer all questions SECTION A: MULTIPLE CHOICE ITEMS SECTION B: ONE WORD ITEMS SECTION C: LONG QUESTIONS 2. Number the answers correctly according to the numbering system used in this question paper. 3. Where possible round off to TWO DECIMAL PLACES. 4. Read the questions carefully and start each question on a new page. 5. Answer questions in full sentences and ensure that the format and content of your responses comply with the cognitive levels of the questions. 6. Write neatly and legibly. 7. Use only blue or black ink. Lead pencil answers will NOT be marked. 8. Non-programmable calculators may be used. 9. THIS QUESTION PAPER CONSISTS OF 7 QUESTIONS.

2 SECTION A: MULTIPLE CHOICE ITEMS QUESTION 1 Four possible options are provided as answers to the following questions. Each question has only ONE correct answer. Choose the answer, which in your opinion, is the correct or best one and mark the appropriate block on the answer sheet with a bold pencil cross (X). If more than one block is marked, no marks will be given for that answer A concrete block weighing 250 N is at rest on an inclined surface at an angle of 20. The magnitude of the normal force, in newtons, is: A. 250 B. 250 cos 20 C. 250 sin 20 D. 250 tan 20 (2) 1.2. A box of mass 20 kg rests on a smooth horizontal surface. What will happen to the box if two forces each of magnitude 200 N are applied simultaneously to the box as shown in the diagram? The box will: A. be lifted off the surface B. move to the left C. move to the right D. remain at rest (2) 1.3. Which ONE of the following statements in an example of Newton s First Law of Motion? A. A cyclist freewheeling down an incline B. A vertically projected object at its highest point C. A cyclist moving at constant velocity along a level road D. The force of a safety belt on an occupant of a vehicle that suddenly stops (2) 1.4. The gravitational force of attraction between two bodies will decrease if the distance between them A. Increase, and their masses decrease B. Increases, and their masses decrease C. Decreases

3 D. Decreases and their masses decrease (2) 1.5. Which statement concerning the path of the ray of light through the glass block is incorrect? A. The angle of incidence of the incident ray is greater than the angle of refraction of the emergent ray B. The intensity of the emergent ray will be less than the intensity of the incident ray C. The light ray is refracted more when it passes through the glass into the air than when it passes from the air into the glass D. The incident ray is parallel to the emergent ray (2) 1.6. In an investigation, yellow light and blue light are passed through a single slit in a diffraction grating in turn. The yellow light will A. Undergo a greater degree of refraction at the slit than the blue light because it has a larger frequency than blue light. B. Produce a pattern on a screen with wider bands than the pattern formed by the blue light because it has a smaller wavelength than blue light C. Undergo a smaller degree of diffraction because it has a smaller frequency than blue light D. Undergo a greater degree of diffraction because it has a larger wavelength than blue light (2) 1.7. When a ray of light passes from air into a more optically dense medium, the angle of refraction will depend on the A. Density of the optical medium only B. Incident angle only C. Refractive index and the density of the optical medium D. Refractive index of the medium and the angle of incidence (2) 1.8. Which of these two statements concerning Newton s Third Law of Motion is FALSE? The two forces of the force pair According to Newton s Law of Motion the two forces of the N3 force pair are A. Of equal magnitude, working in opposite directions B. Exerted at the same time along the same straight line C. Exerted on the same object D. Of the same type of force (2) 1.9. Total internal reflection takes place under the following conditions (i) The angle of incidence must be equal to the critical angle (ii) The angle of incidence must be greater than the critical angle (iii) The light must pass from air into another optically-dense medium

4 (iv) The incident light must move from a more optically-dense medium into a less optically-dense medium A. (i) and (ii) B. (ii) and (iii) C. (ii) D. (ii) and (iv) (2) The refractive index for water is 1,33 and the refractive index for glass is 1,52. The critical angle (c) for glass when light passes into water may be calculated as follows A. sin c = ( 1,33 1,52 ) sin90 B. sin c = ( 1,52 1,33 ) sin90 C. sin c = 1,52 sin 90 D. sin c = 1,33 sin 90 (2) SECTION B: ONE-WORD ITEMS QUESTION 2 Give one WORD/TERM for the following: 2.1. The phenomena that light undergoes when it does not pass out of an optically dense medium but is reflected back into the medium. (2) 2.2. Newton s Law of Motion that is related to the inertia of an object. (2) 2.3. n 1 sin θ 1 = n 2 sin θ 2 (2) 2.4. The law of motion that details for every action there is an equal yet opposite reaction (2) 2.5. The bending of a wave as it passes around the edge of an obstacle in its path (2) [20] [10]

5 SECTION C: LONG QUESTIONS QUESTION 3 In the diagram below, a 2kg mass on a rough horizontal surface is joined to a 5 kg mass by a light inextensible string running over a frictionless pulley. The coefficient of kinetic friction between the 2 kg mass and the surface is 0, Draw free body diagrams of the forces acting on each of the two blocks (3) 3.2. Calculate the magnitude of the kinetic frictional force acting on the 2 kg mass. (3) 3.2. Calculate the acceleration of the 2 kg mass (7) 3.3. Calculate the tension in the string (3) [16] QUESTION 4 You tie two blocks together by a short length of a very light string that does not stretch. The two blocks have masses of 4 kg and 6 kg, as shown in the following diagram. A force of 84 N pulls the 6 kg block to the right. There is a constant frictional force of 12 N that acts between the surface and each of the two blocks Draw a labelled free body diagram for each block. Indicate the horizontal forces only. (6) 4.2. State Newton s second law of motion in words. (3) 4.3. Apply Newton s second law of motion to calculate the acceleration of the system. (6)

6 4.4. Determine the coefficient of kinetic friction, μ k, between the surface and the 6 kg block. (4) [19] QUESTION 5 A parachutist jumps out of an aircraft that is flying at a certain altitude. The mass of the parachutist and his equipment is 110 kg Determine the weight of the parachutist and his equipment when he is still on the ground. (2) 5.2. Why does the parachutist fall to the ground once he leaves the aircraft? (1) 5.3. At the moment the parachutist leaves the aircraft, the gravitational force on him at this altitude is N Why is the gravitational force at this altitude less than the parachutist s weight as calculated in question 5.1. (2) Earth has a mass of kg and an average radius of m. Calculate the altitude of the aircraft when the parachutist jumped out. (6) QUESTION 6 Light passing from air is incident on the block of Perspex as shown in the diagram. The light ray is at an angle of 20 with the surface of the Perspex block. [11] 6.1. When does the refraction of light take place? (1) 6.2. Redraw the diagram and show the path of the light when it enters the Perspex block. Show the following on your diagram: Normal (N), angle of incidence (i), refracted ray and angle of refraction (r). (5)

7 6.3. What is the value of the incident angle of the light passing into the Perspex? (2) 6.4. The refractive index of air is 1,00 and the refractive index of Perspex is 1,4. Calculate the angle of refraction of light when it passes into the Perspex block. (4) 6.5. What law was applied to calculate the angle of refraction in question 6.4. (1) 6.6. The light ray does not pass through and out of the block, but undergoes total internal reflection Give the value of the angle of incidence of the light ray in the Perspex when it undergoes total internal reflection. (1) Apart from the critical angle, what other condition is necessary for total internal reflection to take place? (1) QUESTION 7 The given diagram show the interference patterns for a yellow light (with wavelength of 582 nm) and for a blue light (with wavelength 460 nm) that are passed through the same slit in turn. [15] 7.1. To which spectrum does blue and yellow light belong? (1) 7.2. State Huygen s Principle (2) 7.3. What happens to the light as it passes through the slit? (1) 7.4. What causes the dark bands in the patterns? (1) 7.5. What diffraction pattern represents the blue light? A or B? Justify your answer. (3)

8 7.6. If the slit is made narrower, will the width of the central bright band increase, decrease or remain the same? (1) [9] GRAND TOTAL: 100 MARKS

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