NATIONAL SENIOR CERTIFICATE EXAMINATION PHYSICAL SCIENCES (P1) JUNE 2015 EXAMINATION QUESTION PAPER GRADE10

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1 NATIONAL SENIOR CERTIFICATE EXAMINATION PHYSICAL SCIENCES (P1) JUNE 2015 EXAMINATION QUESTION PAPER GRADE10 MARKS: 150 TIME: 2 HOURS This question paper consists of 14 pages including data sheets

2 INSTRUCTIONS AND INFORMATION 1 Write your name in the appropriate space on the FOLIO PAPER. 2 This question paper consists of TEN questions. Answer ALL the questions. 3 Start EACH question on a NEW page in the FOLIO PAPER. 4 You may use a non-programmable calculator 5 You may use appropriate mathematical instruments 6 YOU ARE ADVISED TO USE THE ATTACHED DATA SHEETS 7 Show ALL formulae and substitutions in ALL calculations 8 Number the answers correctly according to the numbering system used in this question paper 9 Round off your final numerical answers to a minimum of TWO decimal places. 10 Give brief motivations, discussions, et cetera where required. 11 Write neatly and legibly 2

3 QUESTION 1: MULTIPLE-CHOICE QUESTIONS. Four options are provided as possible answers to the following questions. Each question has only ONE correct answer.write only the letter (A - D) next to the question number ( ) in the FOLIO PAPER. 1.1 When sound travels through a solid, the solid s particles. A. travel in the same direction as the sound. B. vibrate parallel with the direction of the sound wave. C. remain stationary D. vibrate at right angles to the direction of the sound wave. (2) 1.2 The speed of a wave in a medium depends on. A. the wavelength of the wave only. B. the frequency of the wave only. C. both the wavelength and the frequency of the wave. D. the wavelength, the frequency and the properties of the medium through which the wave travels. (2) 3

4 1.3 The diagram below represents two pulses of the same amplitude approaching each other. Which diagram below represents the resultant of the two pulses approaching each other? A. B. C. D. (2) 1.4 A wave with a period of 0,2s has a frequency of: A. 20Hz B. 50Hz C. 5Hz D. 2Hz. (2) 4

5 1.5 Which property of light is characteristic of its particle nature? A. Light can be reflected. B. Light can be refracted. C. Light undergoes interference. D. The energy of a photon of light is related to the frequency of the light (2) 1.6 Which of the following is a characteristic of the magnetic field around a bar magnet. The field lines A. attract each other B. form closed curves C. cross one another near the poles D. are more numerous near the north pole than near the south pole. (2) 1.7 Two identical metallic spheres, X with a charge of -7 x 10-6 C and Y with a charge of + 3x 10-6 C are attached to wooden stands. -7 x 10-6 C X +3 x 10-6 C Y Spheres X and Y are allowed to touch and then separated.the charges on X and Y after they are separated will be: CHARGE ON X CHARGE ON Y A -2 x 10-6 C + 2 x 10-6 C B -5 x 10-6 C -5 x 10-6 C C -2 x 10-6 C -2 x 10-6 C D + 2 x 10-6 C -2 x 10-6 C (2) 5

6 1.8 A glass rod is charged positively by rubbing it with a silk cloth. During this process. A. electrons are transferred from the glass rod to the silk cloth. B. electrons are tranferred from the silk cloth to the glass rod. C. protons are transferred from the glass rod to silk cloth. D. protons are tranferred from the silk cloth to the glass rod. (2) 1.9 Which ONE of the following is the unit of measurement for the rate of flow of charge? A. Ohm B. Volt C. Ampere D. Coulomb (2) 1.10 The potential difference across the cell in both circuit diagrams is the same. The light bulbs are identical. A 1 A 2 A 3 Which of the following statements about the readings on the ammeters is correct? A. A 1 = A 2. B. A 2 = 2A 1 C. A 2 < A 3 D. A 1 > A 3 (2) [20] 6

7 QUESTION 2 ( Start on a new page ) Water waves crash against a harbour wall. Six waves hit the wall in 4s. The distance between successive troughs is 9m.The height of the wave formation (from crest to trough) is 1,5m. B 9 m D F A 1, 5 m H Harbour wall C E G 2.1 Define the term wavelength (2) 2.2 Are water waves transverse or longitudinal waves? (1) 2.3 How many complete waves are shown in the sketch above? (1) 2.4 Write down the letters of any TWO points that : are in phase. (2) are out of phase. (2) the distance between them represents a wavelength. (2) 2.5 Calculate the amplitude of the waves. (2) period of the waves. (2) frequency of the waves. (3) speed of the waves. (3) [20] 7

8 QUESTION 3 (Start on a new page) Two learners used a slinky spring and produced a wave pattern as shown in the sketch below. 45cm Slinky O X P Y Q movement Wave propagation 3.1 Name the type of wave produced on the slinky spring. Your naming must be based on the movement of the slinky spring and the direction of propagation of the wave (2) 3.2 Points X and Y represent regions where the coils are spread apart, thus maximizing the distance between coils. What is the name given to such points? (2) 3.3 Points O, P and Q represent regions where the coils are pressed together in a small amount of space. What is the name given to such points? (2) 3.4 How many wavelengths are represented from O to Q? (2) 3.5 Determine the wavelength of the wave in meters from the sketch. (2) 3.6 Calculate the frequency of this wave if the velocity of the wave is 9.0 m.s -1 (4) 3.7 Calculate the period of the wave (3) [17] 8

9 QUESTION 4 (Start on a new page) You are on one side in an Olympic swimming pool with one ear above the surface.a friend of yours, 50m away in the water, slaps against the surface of the water with his hand. The temperature outside is 20 0 C and the speed of sound is 344 m.s -1. The temperature of the water is 15 0 C and the speed of sound in water is 1480 m.s Calculate how long it will take to hear the slap with the ear that is above the water. (3) 4.2 Calculate how long it will take to hear the slap with the ear that is below the water. (The speed of sound in the water is 1480 m.s -1 ). (3) 4.3 What conclusion can be drawn from your answers to question 4.1 and 4.2? Give an explanation for your answer. (3) [9] QUESTION 5 (Start on a new page ) Over 100 years ago scientists thought that there must be an invisible substance in space that enables light to travel from the sun to the Earth. We now know that such a substance is not necessary for propagation of electromagnetic radiation. 5.1 Describe the source of electromagnetic waves. (2) 5.2 Name a quantity that is the same for light and for all other types of electromagnetic radiation. (1) 5.3 Red light having a wavelength of 670 nm, is propagated in a vacuum. Calculate the frequency of this light. (4) 5.4 Calculate the energy of a photon of red light. (3) 5.5 Which type of the electromagnetic radiation has the highest penetrating ability? Give a reason for your answer. (3) [13] 9

10 QUESTION 6 (Start on a new page ) The Earth has a magnetic field that spreads out far beyond its surface. 6.1 Define the term magnetic field (2) 6.2 How does a compass needle show the direction of the Earth s magnetic field? (2) 6.3 Describe what the solar wind is and how we are protected from it on Earth. (3) 6.4 Two bar magnets are placed close to one another as shown in the diagram below. S N S N Draw the magnetic field pattern between the two magnets. (3) The magnets are now moved further apart. What effect will this change have on the magnetic field pattern drawn in QUESTION (1) The Prefix di-means two. Explain why magnets are said to be dipoles (1) [12] QUESTION 7 (Start on a new page ) A learner rubs two substances, a plastic rod and a woollen cloth, together. The plastic rod acquires a negative charge during this process. 7.1 State the principle of conservation of charge. (2) 7.2 Refer to atomic structure to explain why protons do not transfer between the plastic rod and a woollen cloth. (3) 7.3 Will the glass rod and the woollen cloth attract or do they repel each other after rubbing them together? Explain your answer. (2) 7.4 What will you observe if the charged plastic rod is brought next to a neutral pith ball? Explain your answer. (3) [10] 10

11 QUESTION 8 ( Start on a new page ) Two identical metal spheres A and B on insulated stands carry charges of +4, 4 nc and -2,0 nc respectively. 8.1 Which sphere is deficient in electrons? (1) 8.2 The spheres are brought into contact and then separated What is the direction of the force that the spheres exert on each other after they separate? Give a reason, (2) Calculate the new charge on each sphere. (3) Name the principle that you used to answer Question (1) Which sphere loses electrons when the two spheres come into contact? (1) Calculate the number of electrons transferred from the one sphere to the other when they come into contact. (5) Name the principle that you used to calculate Question (1) [14] 11

12 QUESTION 9 (Start on a new page ) A current of 1, 5 A flows through a bulb in 30s. The potential difference across the bulb is 120V. 9.1 Define potential difference. (2) 9.2 Calculate the amount of energy transferred to the bulb. (4) 9.3 Draw a labelled electric circuit consisting of the following electrical components: A battery consisting of 3 cells A closed switch Conductors One resistor An ammeter A voltmeter to show the potential difference across the resistor. (8) [14] 12

13 QUESTION 10 (Start on a new page ) In the circuit below the resistance of the 12 V battery is negligible.the resistance of the connecting wires is negligible. When switch S is closed, the current in the 2 Ω resistor is 1, 2 A. 6V A S 3Ω R V 2 2Ω V Define the term resistance (2) Calculate the: 10.2 The effective resistance of the parallel combination. (3) 10.3 Current passing through the 3 Ω resistor. (4) 10.4 Total current in the circuit. (2) 10.5 Resistance R. (3) 10.6 A charge of 48 C flows through the circuit in 2 minutes. Calculate the current flowing in the circuit. (4) 10.7 After a while the 2 Ω resistor gets hotter than the 3Ω resistor. Explain this observation. (3) [21] TOTAL

14 INFORMATION FOR PHYSICAL SCIENCES GRADE 10 PAPER 1 ( PHYSICS) TABLE 1 : PHYSICAL CONSTANTS NAME SYMBOL VALUE Gravitational acceleration g 9,8 m.s -2 Speed of light in vacuum c 3.0 x 10 8 m.s -1 TABLE 2: FORMULAS MOTION v f = v i + a t x = v i t + a t 2 v i 2 = v i 2 + 2a x WEIGHT AND MECHANICAL ENERGYλ Fg = mg U = Ep= mgh K=Ek = ½mv 2 WAVES, LIGHT AND SOUND v= fλ T= E = hf or/of E=h ELECTRICITY R s = R 1 + R 2 +. = + I= 14

15 NATIONAL SENIOR CERTIFICATE EXAMINATION PHYSICAL SCIENCES (P1) JUNE 2015 EXAMINATION MEMORANDUM GRADE10 MARKS: 150 This memorandum consists of 8 pages.

16 Physical sciences /P1 CAPS/Grade 10 - Memorandum MPU BDE/June 2015 QUESTION B (2) 1.2 D (2) 1.3 C (2) 1.4 C (2) 1.5 D (2) 1.6 B (2) 1.7 C (2) 1.8 A (2) 1.9 C (2) 1.10 B (2) [20] QUESTION Distance between two successive crests or troughs (2) 2.2 transverse (1) complete waves (1) B and D or D andf or C and E or E and G or A and H ANY TWO (2) A and Bor A and C or D and E ANY CORRECT TWO (2) BDor DF or CE or EG (2) = 0,75m (2) OPTION 1 Period is the time taken to complete one cycle /wave 6 waves hit the seawall in 4s i.e 6 waves pass a point in 4s 1 wave passes a point in s = 0,67s. Period T=0,67 s. OPTION 2 = = 0,67 s (2) 2

17 Physical sciences /P1 CAPS/Grade 10 - Memorandum MPU BDE/June OPTION 1 OPTION 2 OPTION 3 f= = = 1.5Hz f= = = 1.5Hz f= = = 1.5Hz (3) OPTION 1 V=f = 1.5 x 9 =13,5m.s -1 OPTION 2 Constant velocity = = = = 13,5m.s -1 (3) [20] QUESTION Longitudinal wave (2) 3.2 Rarefactions (2) 3.3 compressions (2) wavelengths (2) m OR 0.225m (2) 3.6 v = f 9= f 0,225 f = 40Hz (4) 3.7 T= = = 0,025s (3) [17] 3

18 Physical sciences /P1 CAPS/Grade 10 - Memorandum MPU BDE/June 2015 QUESTION = 0,15s (3) 4.2 t = 0,034s (3) 4.3 The speed of sound is faster in water than in air. The more elastic the medium is, the greater the speed of sound. (3) [9] QUESTION Accelerating charges (2) 5.2 Speed (1) 5.3 c =f 3 x 10 8 = f x 670 x 10-9 f =4.48 x Hz (4) 5.4 E = hf + = 6.63 x x 4.48 x =29,7 x = 2,97 x J (3) 5.5 Gamma rays. It has the highest frequencyand highest energy in the EM spectrum (3) [13] 4

19 Physical sciences /P1 CAPS/Grade 10 - Memorandum MPU BDE/June 2015 QUESTION A region in space where another magnet of ferromagnetic material will experience a force (2) 6.2 Compass needle will point more or less towards the north pole. (2) 6.3 The solar wind consists mainly of electrons and protons that are ejected from 6.4 the sun with high energy and travel across the solar system. The magnetic field causes them to be spiral towards the poles where they do little harm. (3) Criteria for magnetic field pattern Correct shape. Correct direction Field lines do not touch/cross each other (3) Fewer magnetic field lines further apart/ less dense (1) Magnets have a pair of opposite poles. (1) [12] QUESTION The net chargeof an isolated system remains constantduring any physical process. (2) 7.2 Protons are found at the centre of the nucleuswhereas electrons are orbiting around the nucleustherefore electrons will be easily transferred. (3) 7.3 Attract, unlike charges attract each other (2) 7.4 The pith ball will be attracted to the plastic rod.the atoms of the pith ball become polarised causing the it to have a positive side and a negative side.the positive side of the ball will face the rod hence the ball will be attracted to the rod. (3) [10] 5

20 Physical sciences /P1 CAPS/Grade 10 - Memorandum MPU BDE/June 2015 QUESTION A (1) Away from each other (force of repulsion ), like charges repel each other. (2) OPTION 1 OPTION 2 = ( ) ( ) = +1,2nC ( ) ( ) = +1,2 x 10-9 C (3) Law of conservation of charges (1) B (1) OPTION 1 OPTION 2 ΔQ = Q f Q i = (+1,2nC) (4,4nC) = -3,2nC = -3,2 x 10-9 C Q = nq e -3,2 x 10-9 = n x-1,6 x ΔQ = Q f Q i = (+1,2nC) (-2,0nC) = +3,2nC = +3,2 x 10-9 C Q = nq e 3,2 x 10-9 = n x1,6 x n= 2 x electrons n= 2 x electrons Principle of the quantization of charge (1) [14] QUESTION Potential difference is the amount of energy transferred when one coulomb of charge moves from one point to another in an electric circuit. (2) (5) 9.2 I = 1,5 = Q = 45 C for both formulae V = = W = 5400 J (4) 6

21 Physical sciences /P1 CAPS/Grade 10 - Memorandum MPU BDE/June Direction of the flow of current indicated A V Ammeter and voltmeter connected correctly (8) [14] QUESTION Resistance is the opposition to the flow of charges. (2) 10.2 OPTION 1 OPTION 2 = + = ( )( ) = =1,2 Ω 10.3 OPTION 1 V 1 = IR 2Ω = 1,2 x2 = 2,4V V = IR 3Ω 2,4 = I 3Ω x 3 I 8Ω = 0,8 A = R p = R p = 1,2 Ω OPTION 2 2 Ω : 3 Ω I 3Ω : 1.2A I 3Ω = = 0.8 A (3) (4) 10.4 I t = I 2Ω + I 3Ω = 1,2 + 0,8 = 2 A (2) 7

22 Physical sciences /P1 CAPS/Grade 10 - Memorandum MPU BDE/June V t = V R + V p 6 = V R V R = 3.6V V = IR 3.6 = 2 X R R = 1,8 Ω (3) 10.6 Q = It 48 = I X 2 X 60 I = 0,4 Ω (4) 10.7 According to W=, when the potential difference is the same and time is also the same W α. Therefore the smaller resistance, the larger the heat transferred to the resistor. (3) [21] TOTAL 150 8