Physical Sciences Grade 11 KwaZulu Natal June 2021 QP

@ 7 we a OP RY Saw Gay oe a eR EDUCATION " REPUBLIC OF SOUTH AFRICA es DER SR ES RERR RHR RRR RRR RES Ro PHYSICAL SCIENCES COMMON TEST JUNE 2021 > iy a a n a " a un u w u y SSP ee NATIONAL SENIOR CERTIFICATE GRADE 11 | TIME: 1hour MARKS: 50 | This question paper consists of 7 pages and 2 data sheets.

Downloaded from hlayiso.com Physical Sciences 2 June 2021 Common Test NSC INSTRUCTIONS AND INFORMATION TO CANDIDATES 8. 9. Write your name on the ANSWER BOOK. This question paper consists of FOUR questions. Answer ALL the questions in the ANSWER BOOK. Start EACH question on a NEW page in the ANSWER BOOK. Number the answers correctly according to the numbering system used in this question paper. Leave ONE line between two subsections, for example between QUESTION 2.1 and QUESTION 2.2. You may use a non-programmable calculator. You may use appropriate mathematical instruments. You are advised to use the attached DATA SHEET. Show ALL formulae and substitutions in ALL calculations. 10. Round off your final numerical answers to a minimum of TWO decimal places. dd. Give brief motivations, discussions, et cetera where required. Copyright Reserved Please Turn Over

Downloaded from hlayiso.com Physical Sciences 3 June 2021 Common Test NSC 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 (1.1 — 1.4) in the ANSWER BOOK, for example 1.5 E. 1.1 Two neutral metal spheres X and Y, on an insulating stand, are brought into contact with each other. A negatively charged rod is held near X without touching OO) [ =] Negatively charged rod vat cae The spheres are separated and the rod is removed. The charges on the spheres X and Y after separation will be... Positive and negative respectively Both neutral Both positive Negative and positive respectively (2) 0QWD 1.2 Two identical small metal spheres on insulated stands carry equal charges and are a distance d apart. Each sphere experiences an electrostatic force of magnitude F. The spheres are now placed a distance 3 d apart. The magnitude of the electrostatic force each sphere now experiences is ... A 3F B Y, F Cc 9F D I/.F (2) 1.3. Which ONE of the following substances has dipole-dipole forces between the molecules? A te B CO, Cc H,0 DCH, (2) Copyright Reserved Please Turn Over

Downloaded from hlayiso.com Physical Sciences 4 June 2021 Common Test NSC 1.4 The number of atoms in 2g of Hz is: A 3,01 x 1078 B 6,02 x 10 Cc 2 D 12,04 x 1078 (2) [8] QUESTION TWO 2.1 Two identical spheres, X and Y, are suspended by insulated threads from a ceiling, as shown in the diagram below. [ ] X Y Sphere X has an excess of 25 electrons and the charge on Y is unknown. The spheres are brought into contact with each other and then separated. The charge on each sphere after separation is 8x10"® C, Calculate the charge on sphere Y before it made contact with sphere X. (3) Copyright Reserved Please Turn Over

Downloaded from hlayiso.com Physical Sciences 5 June 2021 Common Test NSC 2.2 A small sphere, P, with a charge of + 15 x 10°C, is suspended from a light string attached to the ceiling. Sphere, Q, with a charge of — 30 x 10°C is fixed on an insulated stand directly below P. The distance between the centres of the two spheres is 2,8 cm. The tension in the string holding sphere P is 0,05 N. c 2,8 cm Sooxi0.c( 2 | 2.2.1 State Coulombs law in words. (2) 2.2.2 Calculate the magnitude of the electrostatic force the spheres exert on each other. (3) 2.2.3 Calculate the weight of sphere P. (4) 2.3 2.3.1 Define electric field at a point. (2) 2.3.2 The electric field at a distance of 0,032 m from a charged object is 3.61x10° N-C’. What is the magnitude of the electric field at a distance of 0,195 m from the same object? (4) [18] Copyright Reserved Please Turn Over

Downloaded from hlayiso.com Physical Sciences 6 June 2021 Common Test NSC QUESTION 3 (Start on a new page) A group of learners decided to carry out an investigation to study the effect of intermolecular forces on the boiling point of the liquids listed in the table below. The following apparatus was used. b—— Beaker Test tube with liquid t-——— Thermometer # +-— Water re ef Wire gauze Fripod stand LIQUID BOILING POINT (°C) Acetone 56 Ethanol 78,37 Water 100 3.1. Define boiling point. (2) 3.2 Identify the independent variable in this investigation. (1) 3.3 Why must ethanol be heated in a water bath? (1) 3.4 Explain the difference in the boiling points of acetone and water by referring to the TYPES of intermolecular forces in these compounds. (4) 3.5 Write a conclusion for this investigation. (1) 3.6 Will the vapour pressure of ethanol to be HIGHER THAN or LOWER THAN acetone? Give a reason for the answer. (2) [11] Copyright Reserved Please Turn Over

Downloaded from hlayiso.com Physical Sciences if June 2021 Common Test NSC QUESTION 4 (Start on a new page) 4.1. Acompound has the following percentage composition: 58,065% C 7,527%H 34,408 %O Determine the molecular formula of this compound if its molar mass is 372 g-mol" (5) 4.2 1,29 of magnesium (Mg), is reacted with 250 cm of a hydrochloric acid (HC2) solution of concentration 0,5 mol-dm® according to the following balanced equation: Mg(s) + 2HCl(aq) ————> MgCé,(aq) + Hha(g) 4.2.1 Define limiting reagent (2) 4,2,2 Determine the limiting reagent by means of a calculation (3) 4.2.3 Calculate the volume of H2(g produced if the molar gas volume is 23,2 dm?-mol' (3) [13} TOTAL MARKS: 50 Copyright Reserved Please Turn Over

Downloaded from hlayiso.com riysival Ourenives June 2021 Common Test re} NSC DATA FOR PHYSICAL SCIENCES GRADE 11 PHYSICS TABLE 1: PHYSICAL CONSTANTS NAME SYMBOL VALUE Acceleration due to gravity g 9,8 ms” Coulomb's constant k 9,0x 10 N-m -C Charge on electron e o16 x 102.6 Electron mass Me 9,11 x 107" kg TABLE 2 : FORMULAE ELECTROSTATICS k F FOS. (kK = 9,0 x 10°N.m?-C*) 4 ge. ke (k= 9,0 x 10°N.m2-c2) | y=. r Q TABLE 3: PHYSICAL CONSTANTS NAME SYMBOL VALUE Avogadro's constant Na 6,02 x 107 mor’ Molar gas constant R 8,31 J-K*-mol™ Standard pressure p? 1,013 x 10° Pa Standard temperature T° 273K TABLE 4: FORMULAE n= m a= ck “M Ny n m V =— OR = 1 =—— ery °= MV 72 Copyright Reserved Please Turn Over

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