RONDEBOSCH BOYS HIGH SCHOOL

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1 RONDEOSCH OYS HIGH SCHOOL GRDE 10 PHYSICL SCIENCES PPER 1 (PHYSICS) EXMINTION - NOVEMER 2012 MRKS: 120 EXMINER: HLDY TIME: 1 ½ hours MODERTORS: S ERHIM F LLIE-ERHIM This question paper consists of 13 pages and a data sheet.

2 Page 2 of 14 INSTRUCTIONS ND INFORMTION 1. Write your name on your NSWER OOK. 2. nswer LL the questions. 3. This question paper consists of TWO sections: SECTION (20) SECTION (100) 4. nswer SECTION and SECTION in your NSWER OOK. 5. Non-programmable calculators may be used. 6. ppropriate mathematical instruments may be used. 7. Number your answers correctly according to the numbering system used in this question paper. 8. Refer to the attached data sheet where necessary. 9. Wherever motivation, discussion, et cetera is required, be brief.

3 Page 3 of 14 SECTION QUESTION 1: MULTIPLE-CHOICE QUESTIONS Four options are provided as possible answers to the following questions. Each question has only ONE correct answer. Choose the answer and write only the letter ( - D) next to the question number ( ) on your answer sheet. 1.1 Three identical metal spheres, L, M and N are attached to non-conducting handles. The charges on L and M are -1 nc and +5 nc respectively, while N is neutral. If M is first brought into contact with L, and then with N, and separated again, the final charge on sphere N will be -1 nc +5 nc Neutral L M N +1,5 nc. +1 nc. C +4 nc. D +2 nc. (2) 1.2 Which of the following has the highest frequency? gamma rays infra-red C x-rays D micro waves (2) 1.3 The source of all magnetism is... tiny pieces of iron. tiny domains of aligned atoms. C ferromagnetic materials. D moving electric charge. (2)

4 1.4 The graph shows the displacement of an air particle with time as a sound wave moves past. Page 4 of 14 Displacement (cm) 0,006 metre 0 0,01 metr 0,02 metr 0,03 metr Time (s) -0,006 metres What is the frequency of these waves in Hz? 0,01 0,02 C 50 D 100 (2) 1.5 Which one of the given directions correctly represents the direction of vector X? N W 30 E X S 30 east of south 60 south of east C bearing of 30 D bearing of 120 (2) 1.6 person throws a ball vertically upwards. The acceleration of the ball at its maximum height. C is zero. changes direction instantaneously from upward to downward. is upward. D is downward. (2)

5 Page 5 of When a motorcycle accelerates from v1 to v2 in 10 s, its acceleration is a. If it were to accelerate from v1 to v2 in 20 s, its acceleration would be: C ½ a a 2a D 2a (2) 1.8 The acceleration-time graph for a moving body is shown below. a (m.s -2 ) t t (s) Which one of the following velocity-time graphs shown below best represents the motion of the body during the same time period, t? velocity velocity t t C D velocity velocity t t (2)

6 Page 6 of The resistors, P, Q, R and S in the diagram are identical. P Q R S cross which resistor will the potential difference be the greatest? P Q C R D S (2) 1.10 The diagram below depicts a swinging pendulum. t the highest point of its swing the ball has 500 J potential energy in respect to the level of its lowest point. t the lowest point of its swing the ball has 500 J of kinetic energy. The total mechanical energy of this system is C 0 J 250 J 500 J D 1000 J (2) TOTL SECTION : [20]

7 Page 7 of 14 SECTION INSTRUCTIONS ND INFORMTION 1. nswer this section in your NSWER OOK. 2. In LL calculations, formulae and substitution must be shown. 3. Round off your answers to TWO decimal places. QUESTION 2 Study the table of wavelengths for different types of electromagnetic radiation and answer the questions that follow. The energy of a photon of electromagnetic radiation is 4,25 x J. 2.1 Calculate the frequency of the radiation. (3) 2.2 Calculate the wavelength of the radiation. (3) 2.3 What type of radiation is this? (1) 2.4 Mention one use of this type of radiation. (1) [8]

8 Page 8 of 14 QUESTION 3 boy on a bicycle delivers newspapers to three houses,, and C respectively, as shown in the diagram. He begins at which is west of and ends at C which is directly north of. N C W S E 120 m 50 m 3.1 What is meant by the term displacement? (2) 3.2 Calculate the total distance the boy rides. (1) 3.3 Determine, by means of an accurate scale drawing, the boy's resultant displacement. (Use the scale 10 mm = 10 m) (4) [7]

9 Page 9 of 14 QUESTION 4 trolley runs down a frictionless slope pulling a ticker-tape behind it through a ticker-timer. The frequency of the ticker-timer is 50 Hz. The ticker-tape is shown below and is marked at intervals which are 10 periods apart. E 50mm D 40mm C 30mm 20mm Direction of motion 4.1 Is the acceleration throughout the motion constant? (1) 4.2 Give a reason for your answer to Q.4.1. (1) 4.3 Calculate the: period of the ticker-timer; (2) average speed of the trolley between and C; (4) average speed of the trolley between C and E; (3) average acceleration of the trolley. (4) [15]

10 Page 10 of 14 QUESTION cyclist starting from rest, accelerates at a constant rate of 0,5 m.s -2 for 5 seconds along a straight level road. He then maintains his speed for the following 10 seconds. Calculate: the maximum speed reached by the cyclist. (4) the distance covered during the first 5 seconds. (4) the distance covered during the last 10 seconds. (4) 5.2 boy, playing on the roof of a block of flats, hits a cricket ball vertically into the air with an initial upward velocity of 25 m.s -1. The ball passes the edge of the roof, dropping onto the lawn below, 6 s after it was hit. Ignore the effects of air resistance. [12] Calculate the time taken by the ball to reach its maximum height. (5) Calculate the height above the lawn from where the ball was hit. (4) [9]

11 Page 11 of 14 QUESTION 6 The accompanying diagram is a velocity-time graph for the motion of a car in a straight line. 12 v (m.s -1 ) 0 3 t (s) C D E F Use the graph only to answer the following questions DO NOT USE EQUTIONS OF MOTION. 6.1 What was the acceleration of the car between and? (1) 6.2 What specific change in the motion of the car happened after C? (2) 6.3 If the car was initially travelling due east, what was its velocity at point E? (2) 6.4 Calculate the acceleration of the car during section D. (4) 6.5 Calculate the distance the car travelled during the first 5 seconds of its motion. (4) 6.6 Copy the acceleration-time graph shown below in your answer book. Draw the acceleration-time graph that corresponds to the velocity-time graph above. No further calculations are required. (4) a (m.s -2 ) t (s) [17]

12 Page 12 of 14 QUESTION 7 In the circuit represented below, the resistance of the connecting wires, the battery and the ammeter can be ignored. The voltmeters have high resistances. V1 S2 2 Ω V2 2 Ω 5 Ω S1 Each cell delivers 7 V. 7.1 oth switches are open. Determine: the reading on (2) the reading on V1 (2) 7.2 Only switch S1 is closed. Calculate: the reading on. (4) the reading on V2. (3) 7.3 oth switches are now closed. Calculate: the total resistance of the circuit. (4) the reading on the ammeter. (3) the reading on V2. (4) [22]

13 Page 13 of 14 QUESTION 8 Frank, a San Francisco hot dog vendor, has fallen asleep on the job. When an earthquake strikes, his 3x10 2 kg hot dog cart rolls down Nob Hill and reaches point at a speed of 8 m.s -1. Study the scenario below and answer the questions that follow. The effects of friction can be ignored. h = 50 m h = 30 m 8.1 Calculate the total mechanical energy of the cart at point. (5) 8.2 Use energy principles only to calculate the speed of the cart at position. (5) [10] TOTL SECTION : 100 GRND TOTL: 120

14 Page 14 of 14 TLE 1: PHYSICL CONSTNTS DT FOR PHYSICL SCIENCES GRDE 10 PPER 1 (PHYSICS) NME SYMOL VLUE cceleration due to gravity g 9,8 m s 2 Speed of light in a vacuum c 3,0 x 10 8 m s 1 Planck s constant h 6,63 x J.s TLE 2: FORMULE MOTION v v f 2 f v a t i 1 2 x vi t a t 2 2 v v vi 2a x x f i t 2 WEIGHT ND MECHNICL ENERGY F g mg U = = mgh K = E k 1 = mv 2 WVES ND SOUND 2 E p v f 1 T f ELECTRICITY R V I R R R. p 1 2 Rs 1 2 R R... q I W = Vq t