Physical Sciences Grade 12 Question Paper

PRE TEST Physical Sciences Gr 12 2017 WINTER CLASSES Education KwaZulu-Natal Department of Education PHYSICALMSCIENCES PRE TEST 2017 WINTER CLASSES GRADE 12 TOTAL: 30 MARKS TIME: 30 MINUTES GENERAL INSTRUCTIONS 1. Write your name and the name of your school on the answer sheet provided. 2. Answer ALL the questions. 3. Non-programmable calculators may be used. 4. Appropriate mathematical instruments may be used. 5. Data sheets are attached for your use. 6. Marks may be forfeited if instructions are not followed. INSTRUCTIONS 1. Four possible answers, indicated by A, B, C and D, are supplied with each question. Each question has only ONE correct answer. Choose only that answer, which in your opinion, is the correct or best one and mark the appropriate block on the answer sheet with a cross. 3. Do not make any other marks on the answer sheet. Any calculations or writing that may be necessary when answering this question should be done in the answer book and must be deleted clearly by means of a diagonal line drawn across the page. 4. If more than one block is marked, no marks will be awarded for that answer. SUBMIT THE COMPLETED ANSWER SHEET TO THE TUTOR. EXAMPLE: QUESTION: The SI unit of time is ... ANSWER: A t. B h. A B C D C s D m. Page 4 of 11

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https://ultradeep.co.za PRE TEST Physical Sciences Gr 12 2017 WINTER CLASSES 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, B, C or D next to the question number (1.1 – 1.10) in your ANSWER BOOK. 1.1 Which ONE of the following forces always acts perpendicular to the surface on which a body is placed? A. Normal force B. Frictional force C. Gravitational force D. Tension force 1.2. A rubber ball of mass m, travelling east at a velocity y, hits a wall and bounces back 1 towards the west at velocity y . 2 y m m How does the ball's MOMENTUM and KINETIC ENERGY AFTER the collision compare to the MOMENTUM and KINETIC ENERGY AFTER BEFORE the collision? Momentum after collision Kinetic Energy after collision A Reduced to half Increased to doubled B Reduced to half Reduced to quarter B Increase to doubled Increase to doubled D Reduced to half Reduced to half (2) 1.3 A force of magnitude x is applied to a block of mass m at an angle θ to the horizontal as shown in the diagram. x θ m What is the magnitude of the normal force acting on the block? A x cos θ B x sin θ C mg + x sin θ D mg - x sin θ (2) Page 5 of 11 https://tvetpapers.co.za

https://ultradeep.co.za PRE TEST Physical Sciences Gr 12 2017 WINTER CLASSES 1.4 A planet has half the mass of the earth and half the earth’s radius. If the weight of an apple on earth is w. How would the mass and weight of the apple change on this planet? Mass Weight A Halved Halved B Unchanged Unchanged C Doubled Unchanged D Unchanged Doubled (2) 1.5 A ball is released from a height above the floor. The ball falls vertically and bounces off the floor a number of times. Ignore the effects of friction and assume that the collision of the ball with the floor is elastic. Take the point of release of the ball as the reference point and downward direction as positive. Which ONE of the following is a CORRECT representation of the position time graph for the motion Of the ball? A B C D (2) 1.6. Which ONE of the following CANNOT be explained using the Doppler effect? A Observed frequency of light from moving bodies being higher than expected B Red spectral lines from distant stars being shifted C Emission of electrons from a metal surface D 'Flow meters' used in hospitals (2) Page 6 of 11 https://tvetpapers.co.za

https://ultradeep.co.za PRE TEST Physical Sciences Gr 12 2017 WINTER CLASSES 1.7 A source of sound approaches a stationary listener in a straight line at constant velocity. It passes the listener and moves away from him in the same straight line at the same constant velocity. Which ONE of the following graphs best represents the change in observed frequency against time? B A C D 1.8. Which ONE of the following compounds is an ester? A CH3OH B CH3COOCH3 C CH3COOH D CH3COCH3 (2) 1.9. Which ONE of the organic molecules represented below is an UNSATURATED hydrocarbon? A B H H O H H H H H C C C C H H C C C C H H H H H H H C D H H O H H H H H C C C O H H C C C C H H H H H H H (2) Page 7 of 11 https://tvetpapers.co.za

https://ultradeep.co.za PRE TEST Physical Sciences Gr 12 2017 WINTER CLASSES 1.10. Consider the following three structural formulae R, S and T. R H S H H H H H C H H H H C C C C H H C C C H H H H H C H H H H H C H H T H H H H H H C C C C C H H H H H H Which ONE of the following statements is true for the above-mentioned structural formulae? A R and T are the same substance B S and T are the same substance. C R, S and T are different substances. D .R, S and T are all alkenes. (2) 1.11. The structural formula of an organic compound is shown below: H H C H H H H H H C C C C C H H H H H C H H H C H H What is the correct IUPAC name for this organic compound? A 2,4-dimethylhexane B 2-ethyl-4-methylpentane C 2,4,4-trimethylhexane D 2,2,4-trimethylhexane (2) 1.12. The learner investigates the factor that influences the boiling point of alkanes. He determines the boiling points of the first six straight alkanes. Which ONE of the following factor is an independent variable A. Chain Length B. Boiling point B. Functional group D. Branching Page 8 of 11 https://tvetpapers.co.za

https://ultradeep.co.za PRE TEST Physical Sciences Gr 12 2017 WINTER CLASSES 1.13 Sulphuric acid is regarded as a strong acid because It ____ in water Ka value Concentration A. Ionise Larger Concentrated B. Dissociate Smaller Dilute C. Dissociate Smaller Not applicable D Ionise Larger Not applicable (2) 1.14 In the chemical reaction, the difference in the potential energy of the products and the potential energy of the reactants is equal to the…….. A. Rate of the reaction B. Enthalpy of the reaction C. Enthalpy change of the reaction D. Total potential energy of particles. (2) 1.15. The graph below show changes to the reaction at different equilibria in a closed container at t1, t2 and t3. The equation for the reaction is: N2(g) + 3H2(g) ↔ 2NH (g) 3 What changes were done at t1, t2 and t3. t1 t2 t3. A. Increase reactants Decrease pressure Decrease temperature B. Increase products Increase pressure Increase temperature C. Increase reactant Increase pressure Decrease temperature D. Decrease reactants Decrease pressure Increase temperature (2) Page 9 of 11 https://tvetpapers.co.za

https://ultradeep.co.za PRE TEST Physical Sciences Gr 12 2017 WINTER CLASSES DATA FOR PHYSICAL SCIENCES GRADE 12 (PHYSICS) TABLE 1: PHYSICAL CONSTANTS NAME SYMBOL VALUE Acceleration due to gravity g 9,8 m·sˉ2 Gravitational constant G 6,67 x 10ˉ11 N·m2·kgˉ2 Radius of Earth RE 6,38 x 106 m RA Mass of Earth ME 5,98 x 1024 kg MA Speed of light in a vacuum c 3,0 x 108 m·sˉ1 Planck’s constant h 6,63 x 10-34 Coulomb's constant k 9,0 x 109 N·m2·Cˉ2 Charge on electron e -1,6 x 10ˉ19 C Electron mass me 9,11 x 10ˉ31 kg TABLE 2: FORMULAE MOTION vf v i  a 't 'x v i 't  21 a't 2 or/of 'y v i 't  21 a't 2 § v f  vi · § v f  vi · vf 2 2 v i  2a'x or/of v f 2 2 v i  2a'y 'x ¨ ¸ 't or/of 'y ¨ ¸ 't © 2 ¹ © 2 ¹ FORCE Fnet ma p mv Fnet 't 'p w =mg 'p mv f  mv i Gm1m2 Gm F g r2 r2 fsmax PsN / fsmaks PsN fk PkN WORK, ENERGY AND POWER W F'x cosT U mgh or Ep mgh 1 1 Wnet 'K or Wnet 'E k K mv 2 or E k mv 2 2 2 'K K f  K i or 'Ek Ekf  Eki Wnc 'K  'U or Wnc 'Ek  'Ep W P P =Fv 't Page 10 of 11 https://tvetpapers.co.za

https://ultradeep.co.za PRE TEST Physical Sciences Gr 12 2017 WINTER CLASSES DATA FOR PHYSICAL SCIENCES GRADE 12 (CHEMISTRY) TABLE 1: PHYSICAL CONSTANTS TABLE 2: FORMULAE m N NAME SYMBOL VALUE n n M NA n m V Standard pressure pT 1,013 x 105 Pa c or c n V MV Vm c a Va na Molar gas volume at STP Vm 22,4 dm3·molˉ1 pH = -log[H3O+] c b Vb nb Kw =[H3O+]OH-] = 1 x 10-14 at 298 K Standard temperature TT 273 K T T T Charge on electron e -1,6 x 10ˉ19 C Ecell Ecathode  Eanode T T T 6,02 x 1023 mol Ecell Ereduction  Eoxidation Avogadro's constant NA ˉ1 T T T Ecell Eoxidi sin g agent  Ereducing agent Page 11 of 11 https://tvetpapers.co.za

PRE TEST Physical Sciences Gr 12 2017 WINTER CLASSES TABLE 3: THE PERIODIC TABLE OF ELEMENTS 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 (I) (II) Atomic number (III) (IV) (V) (VI) (VII) (VIII) 1 KEY 2 2,1 H He 1 29 4 3 4 Electronegativity Symbol 5 6 7 8 9 10 Li Be 1,9 Cu B C N O F Ne 1,0 1,5 63,5 2,0 2,5 3,0 3,5 4,0 7 9 11 12 14 16 19 20 11 12 13 14 15 16 17 18 0,9 Na 1,2 Mg Approximate relative atomic mass 1,5 Aℓ 1,8 Si 2,1 P 2,5 S 3,0 Cℓ Ar 23 24 27 28 31 32 35,5 40 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 0,8 K 1,0 Ca 1,3 Sc 1,5 Ti 1,6 V 1,6 Cr 1,5 Mn 1,8 Fe 1,8 Co 1,8 Ni 1,9 Cu 1,6 Zn 1,6 Ga 1,8 Ge 2,0 As 2,4 Se 2,8 Br Kr 39 40 45 48 51 52 55 56 59 59 63,5 65 70 73 75 79 80 84 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 0,8 Rb 1,0 Sr 1,2 Y 1,4 Zr Nb 1,8 Mo 1,9 Tc 2,2 Ru 2,2 Rh 2,2 Pd 1,9 Ag 1,7 Cd 1,7 In 1,8 Sn 1,9 Sb 2,1 Te 2,5 I Xe 86 88 89 91 92 96 101 103 106 108 112 115 119 122 128 127 131 55 56 57 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 0,7 Cs 0,9 Ba La 1,6 Hf Ta W Re Os Ir Pt Au Hg 1,8 Tℓ 1,8 Pb 1,9 Bi 2,0 Po 2,5 At Rn 133 137 139 179 181 184 186 190 192 195 197 201 204 207 209 https://tvetpapers.co.za https://ultradeep.co.za 87 88 89 0,7 Fr 0,9 Ra Ac 226 58 59 60 61 62 63 64 65 66 67 68 69 70 71 Ce Pr Nd Pm Sm Eu Gd Tb Dy Ho Er Tm Yb Lu 140 141 144 150 152 157 159 163 165 167 169 173 175 90 91 92 93 94 95 96 97 98 99 100 101 102 103 Th Pa U Np Pu Am Cm Bk Cf Es Fm Md No Lr 232 238