Physical Sciences Grade 12 P1 Gauteng Mock 2016 QP

Downloaded from hlayiso.com GAUTENG DEPARTMENT OF EDUCATION PREPARATORY EXAMINATION 2016 10841 PHYSICAL SCIENCES: PHYSICS FIRST PAPER TIME: 3 hours MARKS: 150 16 pages and 3 data sheets P.T.O.

Downloaded from hlayiso.com 4 PHYSICAL SCIENCES: PHYSICS 2 (First Paper) 10841/16 GAUTENG DEPARTMENT OF EDUCATION PREPARATORY EXAMINATION PHYSICAL SCIENCES: PHYSICS (First Paper) TIME: 3 hours MARKS: 150 INSTRUCTIONS AND INFORMATION 1. Write your name in the appropriate space on the ANSWER BOOK. 2. This question paper consists of 10 questions. Answer ALL the questions in the ANSWER BOOK. 3. Start the answer to each question on a NEW page. 4. Number the answers correctly according to the numbering system used in this question paper. 5. Leave ONE line open between sub-questions, for example between Question 2.1 and Question 2.2. 6. You may use a non-programmable calculator. 7. You may use appropriate mathematical instruments. 8. You are advised to use the attached DATA SHEETS. 9. Show ALL formulae and substitutions in ALL calculations. 10. Round off your final numerical answers to a minimum of TWO decimal places. 11. Give brief discussions, et cetera where required. 12. Write neatly and legibly. P.T.O.

Downloaded from hlayiso.com 4 PHYSICAL SCIENCES: PHYSICS 3 (First Paper) 10841/16 QUESTION 1 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 (1.1 – 1.10) in the ANSWER BOOK, for example 1.11 C. 1.1 The diagram below shows a box being pulled by force F A along a horizontal surface. The box slides towards the right at constant velocity. N FA fk w Which ONE of the following statements about the forces acting on the box is correct? A N is greater than w. B w is greater than N. C F A is greater than f k . D F A is equal to f k . (2) 1.2 The magnitude of the impulse on a ball bouncing off a wall is equal to the ... A net force of the ball on the wall. B product of the net force on the ball and the time it acts. C change in velocity of the ball. D product of the mass and the acceleration of the ball. (2) 1.3 When a bus suddenly accelerates from rest, standing passengers tend to fall backwards. This observation is best explained using ... A Newton’s first law of motion. B Newton’s second law of motion. C Newton’s third law of motion. D Newton’s law of universal gravitation. (2) P.T.O.

Downloaded from hlayiso.com 4 PHYSICAL SCIENCES: PHYSICS 4 (First Paper) 10841/16 1.4 Which ONE of the following will NOT increase the output current of a generator? A Increase the number of turns in the coil. B Wind the armature coil around an aluminium core. C Increase the speed of rotation of the armature coil. D Increase the strength of the magnet. (2) 1.5 The current versus potential difference graphs below were obtained for four resistors P, Q, S and T. P Current (A) Q S T Potential difference (V) The resistor with the second largest resistance is: A P B Q C S D T (2) 1.6 A metallic surface emits photoelectrons when irradiated with green light. When the green light is replaced by ultraviolet light, the kinetic energy (E k ) of the emitted photoelectrons will … A increase. B decrease. C drop to zero. D remain the same. (2) P.T.O.

Downloaded from hlayiso.com 4 PHYSICAL SCIENCES: PHYSICS 5 (First Paper) 10841/16 1.7 Two objects attract each other with a force of magnitude F when they are a distance r apart. If each mass is TRIPLED (3 times larger), the new gravitational force that the one object exerts on the other will be: A 9F B 18F C 24F D 36F (2) 1.8 A car sounds its horn whilst travelling at constant velocity along a straight road. At time t = 0 the car is at position X as shown below. At time t = t 1 the car moves past a stationary listener L. At time t = t 2 the car is at position Y. X L Y Which ONE of the following graphs best represents the variation of the frequency (pitch) of the horn with time as heard by the listener? A B f (Hz) f (Hz) 0 t1 t2 t 0 t1 t2 t C D f (Hz) f (Hz) 0 t1 t2 t 0 t1 t2 t (2) P.T.O.

Downloaded from hlayiso.com 4 PHYSICAL SCIENCES: PHYSICS 6 (First Paper) 10841/16 1.9 Point P is situated a distance r from point charge q as shown below. The electric field at point P due to point charge q is found to be E. r P +q 1 The electric field at point Q which is on a distance r from point charge q will be: 3 A 1 E 9 B 1 E 3 C 3E D 9E (2) 1.10 A ball is dropped to the ground from a certain height and bounces back to the same height. Which ONE of the following velocity versus time graphs represents the motion of the ball if downwards is taken as positive. A v B v (m·s-1) (m·s-1) t (s) t (s) C v D v (m·s-1) (m·s-1) t (s) t (s) (2) [20] P.T.O.

Downloaded from hlayiso.com 4 PHYSICAL SCIENCES: PHYSICS 7 (First Paper) 10841/16 QUESTION 2 (Start on a new page.) Block X of mass 4 kg is connected to block Y of mass 8 kg by a light, inextensible string. Another light, inextensible string attached to block X runs over a frictionless pulley. The system is pulled by means of a constant force of 180 N as shown in the diagram below. Ignore the effects of air resistance. 180 N X 4 kg T Y 8 kg 2.1 State Newton's second law of motion in words. (2) 2.2 Draw a labelled free body diagram showing ALL the forces acting on object X. (3) 2.3 Calculate the: 2.3.1 tension T in the string connecting the two blocks. (4) 2.3.2 magnitude of the acceleration of block X. (2) [11] P.T.O.

Downloaded from hlayiso.com 4 PHYSICAL SCIENCES: PHYSICS 8 (First Paper) 10841/16 QUESTION 3 (Start on a new page.) A stationary rocket on the ground is launched vertically upwards. When it is 550 m above the ground (point Q), an object is released from the rocket. At this instant the velocity of the rocket is 110 m·s-1. The object reaches its MAXIMUM height ABOVE ground at point R. Ignore the effects of air friction. R vat R = 110 m·s-1 Q 550 m Object attached P to rocket Ground 3.1 Give a reason why the object keeps moving upwards after it is released from the rocket. (1) 3.2 What is the direction of the acceleration of the object at: 3.2.1 point P? (1) 3.2.2 point R? (1) 3.3 ONLY use EQUATIONS OF MOTION to calculate the time taken by the OBJECT to: 3.3.1 reach its maximum height after being released from the rocket at (3) point Q. 3.3.2 reach the ground after being released from the rocket at point Q. (4) 3.4 Sketch the velocity versus time graph for the complete motion of the object. On the graph indicate the following: • Initial velocity. • Time to reach its maximum height. • Time when it reaches the ground. (4) [14] P.T.O.

Downloaded from hlayiso.com 4 PHYSICAL SCIENCES: PHYSICS 9 (First Paper) 10841/16 QUESTION 4 (Start on a new page.) A roller-skater approaches an inclined plane at a constant velocity of 20 m·s-1 as shown below. Just before reaching the incline, he picks up a boy standing in his way and then continues up the incline and reaches point B. The total mass of the roller skater is 68 kg and that of the boy is 12 kg. B 20 m·s-1 25° 4.1 State the principle of conservation of linear momentum. (2) 4.2 Calculate the magnitude of the combined velocity of the roller-skater and the boy just after the boy is picked up. (4) 4.3 Use energy principles to calculate the distance that they will move up the incline before coming to a stop at point B. Ignore the effects of friction. (5) 4.4 How will the answer to QUESTION 4.3 be affected if friction between the wheels of the roller-skate and the surface is NOT ignored? Choose from INCREASES, DECREASES or REMAINS THE SAME. Give a reason for the answer. (2) [13] P.T.O.

Downloaded from hlayiso.com 4 PHYSICAL SCIENCES: PHYSICS 10 (First Paper) 10841/16 QUESTION 5 (Start on a new page.) A car of mass 700 kg moves up a rough inclined plane as shown in the diagram below. 30° 5.1 What is the net work done on the car if the car moves up the inclined plane at CONSTANT velocity? (1) 5.2 Draw a labelled free body diagram showing all the forces acting on the car as it moves up the inclined plane. (4) 5.3 The car now starts from rest at the base of the slope and accelerates up the inclined plane. The car’s engine exerts a force of 6 000 N and the coefficient of kinetic friction between the wheels of the car and surface is 0,32. 5.3.1 State the work-energy theorem in words. (2) 5.3.2 Use energy principles to calculate the magnitude of the velocity of the car after moving a distance of 70 m up the incline. (8) [15] QUESTION 6 (Start on a new page.) 6.1 A flying bat emits sound waves at a frequency of 75 Hz. A stationary observer detects the frequency of the sound waves emitted as 73 Hz. The speed of sound in air is 340 m·s-1. 6.1.1 State the Doppler Effect in words. (2) 6.1.2 Is the bat flying TOWARDS or AWAY from the observer? (1) 6.1.3 Calculate the speed at which the bat is flying. (4) 6.2 Briefly explain the observations that enable scientists to tell that the universe is expanding. (4) 6.3 State TWO applications of the Doppler Effect in medicine. (2) [13] P.T.O.

Downloaded from hlayiso.com 4 PHYSICAL SCIENCES: PHYSICS 11 (First Paper) 10841/16 QUESTION 7 (Start on a new page.) Three charges Q 1 , Q 2 and Q 3 carrying charges of +2 x 10 -5 C, -2 x 10-4 C and +2 x 10 -4 C respectively are positioned as shown in the diagram below. North Q3 = 2x10-4 C W E S 0,4 m 0,5 m Q2 = –2x10-4 C Q1 = 2x10-5 C 7.1 State Coulomb’s Law in words. (2) 7.2 Draw a diagram that shows the electrostatic forces exerted on Q 1 by Q 2 and Q3. (2) 7.3 Calculate the net electrostatic force exerted on Q 1 by Q 2 and Q 3 . (7) [11] P.T.O.

Downloaded from hlayiso.com 4 PHYSICAL SCIENCES: PHYSICS 12 (First Paper) 10841/16 QUESTION 8 (Start on a new page.) The battery in the circuit represented below has an emf of 12 V and an internal resistance r. Voltmeter V 1 is connected across the battery. The resistance of the connecting wires is negligible. ε = 12 V A r V1 S2 10 Ω 6Ω 2Ω S1 V2 Switches S 1 and S 2 are both open. 8.1 Write down the reading on voltmeter V 2 . (1) 8.2 Switch S 1 is now closed. Switch S 2 remains open. The reading on V 1 is now 10 V. Calculate the: 8.2.1 total external resistance of the circuit. (4) 8.2.2 internal resistance of the battery. (5) 8.3 Both switches S 1 and S 2 are now closed. How will the reading on the ammeter be affected? CHOOSE from INCREASES, DECREASES or REMAINS THE SAME. Explain the answer. (3) [13] P.T.O.

Downloaded from hlayiso.com 4 PHYSICAL SCIENCES: PHYSICS 13 (First Paper) 10841/16 QUESTION 9 (Start on a new page.) The diagram below shows the essential parts of a generator. coil magnet Split ring commutator Carbon brush 20 Ω 9.1 The coil rotates within the magnetic field. Write down the type of current (AC or DC): 9.1.1 Induced in the coil. (1) 9.1.2 Passing through the 20 Ω resistor. Give a reason for the answer. (2) 9.2 An AC generator is used in the commercial production of electricity. 9.2.1 State ONE fundamental difference in construction between an AC generator and a DC generator. (2) 9.2.2 Fully explain why AC is preferred to DC for transmission of electricity over long distances. (3) P.T.O.

Downloaded from hlayiso.com 4 PHYSICAL SCIENCES: PHYSICS 14 (First Paper) 10841/16 9.3 The diagram below shows the output of an AC generator. A 20 Ω resistor is connected in the circuit. Potential difference +200 0 (V) 0,02 0,04 0,06 0,08 Time (s) –200 Calculate the: 9.3.1 frequency of the power source. (2) 9.3.2 average power dissipated in the resistor. (5) [15] QUESTION 10 Incident light of different wavelengths was shown on a metal cathode in an evacuated tube as shown in the diagram below. incident light + – - e Cathode Anode µA Adjustable p.d. It was found that light of 500 nm releases electrons with zero kinetic energy. The micro- ammeter gives a zero reading. 10.1 Define the term work function. (2) 10.2 Calculate the work function of the metal used as cathode. (5) P.T.O.

Downloaded from hlayiso.com 4 PHYSICAL SCIENCES: PHYSICS 15 (First Paper) 10841/16 10.3 How will each of the following affect the reading on the micro-ammeter? Choose from INCREASES, DECREASES or REMAINS THE SAME. 10.3.1 The intensity of the light is increased. (1) 10.3.2 Light of a wavelength 550 nm is used. (1) The metal cathode is now irradiated with light of wavelength 400 nm. 10.4 Calculate the maximum kinetic energy of an emitted photo-electron. (5) [14] QUESTION 11 (Start on a new page.) A learner set up the circuit shown below to measure the internal resistance of a battery. ε r A Rext V P.T.O.

Downloaded from hlayiso.com 4 PHYSICAL SCIENCES: PHYSICS 16 (First Paper) 10841/16 She records the readings on the voltmeter and ammeter for different resistances of the rheostat. The graph below was obtained from the results. Graph of inverse of current versus external resistance 4  3 1 current  (A-1) 2  1 0 0 2 4 6 8 10 12 External resistance ( Ω ) 11.1 Define the term emf. (2) 11.2 Calculate the gradient of the above graph. (3) 11.3 What is represented by the gradient in QUESTION 11.2? (1) 11.4 Use the information on the graph to calculate the: 11.4.1 emf of the battery. (2) 11.4.2 internal resistance of the battery. (3) [11] GRAND TOTAL: 150 P.T.O.

Downloaded from hlayiso.com 4 PHYSICAL SCIENCES: PHYSICS 17 (First Paper) 10841/16 DATA FOR PHYSICAL SCIENCES GRADE 12 PAPER 1 (PHYSICS) GEGEWENS VIR FISIESE WETENSKAPPE GRAAD 12 VRAESTEL 1 (FISIKA) \ TABLE 1: PHYSICAL CONSTANTS/TABEL 1: FISIESE KONSTANTES NAME/NAAM SYMBOL/SIMBOOL VALUE/WAARDE Acceleration due to gravity g 9,8 m·s-2 Swaartekragversnelling Universal gravitational constant G 6,67 x 10-11 N·m2·kg-2 Universele gravitasiekonstante Radius of the Earth RE 6,38 x 106 m Radius van die Aarde Mass of the Earth ME 5,98 x 1024 kg Massa van die Aarde Speed of light in a vacuum c 3,0 x 108 m·s-1 Spoed van lig in 'n vakuum Planck's constant h 6,63 x 10-34 J·s Planck se konstante Coulomb's constant k 9,0 x 109 N·m2·C-2 Coulomb se konstante Charge on electron e –1,6 x 10-19 C Lading op elektron Electron mass me 9,11 x 10-31 kg Elektronmassa P.T.O.

Downloaded from hlayiso.com 4 PHYSICAL SCIENCES: PHYSICS 18 (First Paper) 10841/16 TABLE 2: FORMULAE/TABEL 2: FORMULES MOTION/BEWEGING v f = vi + a ∆t Δx = v i Δt + 21 a∆t 2 or/of Δy = v i Δt + 21 a∆t 2 v f = v i + 2a∆x or/of  v + vf   v + vf  2 2 Δx =  i  Δt Δy =  i  Δt v f = v i + 2a∆y 2 2  2  or/of  2  FORCE Fnet = ma p = mv f s max = μ sN fk = µ k N Fnet ∆t = ∆p ∆p = mv f - mv i w = mg m1m 2 m1m 2 M M F=G or/of F=G g = G or/of g= G 2 d2 r2 d2 r WORK, ENERGY AND POWER W = FΔx cos θ U = mgh or/of EP = mgh Wnet = ∆K or/of Wnet = ∆Ek 1 1 K = mv 2 or/of E k = mv 2 2 2 ∆K = K f − K i or/of ∆Ek = Ekf − Eki W Wnc = ∆K + ∆U or/of Wnc = ∆Ek + ∆Ep P= ∆t P ave = Fv ave / P gemid = Fv gemid WAVES, SOUND AND LIGHT/GOLWE, KLANK EN LIG 1 v=fλ T= f v ± vL v ± vL hc fL = fs fL = fb E = hf or /of E = v ± vs v ± vb λ E = Wo + Ek(max) or/of E = Wo + K max where/waar 1 1 E = hf and/en W0 = hf0 and/en Ek (max) = 2 mv max or/of K max = 2 mv max 2 2 P.T.O.

Downloaded from hlayiso.com 4 PHYSICAL SCIENCES: PHYSICS 19 (First Paper) 10841/16 ELECTROSTATICS/ELEKTROSTATIKA kQ 1Q 2 kQ F= E= r2 r2 W F V= E= q q Q Q n= or/of n= e qe ELECTRIC CIRCUITS/ELEKTRIESE STROOMBANE emf ( ε ) = I(R + r) V R= I emk ( ε ) = I(R + r) R s = R1 + R 2 + ... 1 1 1 q = I∆t = + + ... R p R1 R 2 W = Vq W P= Δt W = VI ∆ t P = VI W = I2R ∆ t P = I 2R V Δt2 W= V2 R P= R ALTERNATING CURRENT/WISSELSTROOM Pave = Vrms I rms / Pgemiddeld = Vwgk I wgk Imax I maks Irms = / I wgk = 2 2 Pave = I rms 2 R / Pgemiddeld = I 2wgk R Vmax Vmaks Vrms = / Vwgk = 2 Vrms 2 Vwgk 2 2 Pave = / Pgemiddeld = R R END