HKDSE Exam Question Distribution
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1 HKDSE Eam Question Distribution Paper 1 Sample Paper Practice Paper DSE 01 DSE 013 Topics A(1) A() B A(1) A() B A(1) A() B A(1) A() B Number System and Estimation 17* 8(E) Percentages 4 4 4(E) Formulas and Polynomials, 3, 3, 3, 3 More about Polynomials *(E) 1*(E) Equations * 5 4 Functions and Graphs 13*(E) 1*(E) 17(E) Rates, Ratios and Variations 11, 1(E) 11, 1(E) 11 11, 13*(E) Sequences and Series 15 19*(E) 19*(E) 19*(E) Indeices, Eponential and Logarithmic *(E) 1 19*(E) 1 19*(E) Functions Inequalities and Linear Programming 19*(E) 6 19*(E) 5 19*(E) Transformation, Symmetry and 3-D Figures Straight Lines and Rectilinear Figures 7 Basic Properties of Circles 7 19*(E) 7 14* 8(E) Mensuration 6 9 1(E) 13*(E) Coordinates, Locus and Equations of Straight Lines 8(E) 13(E) 19(E)* 6(E), 8 14*(E) 17* 6 14* Equations of Circles 14* 14*(E) 17* 14* Basic Trigonometry Applications of Trigonometry 18(E) 18(E) 18(E) 18(E) Permutation and Combination 16* 16* 16* 16* Probabilities 16* 13*(E) 16* 16* 10* 16* Statistics 9(E) 14(E) 9(E) 13*(E) 15(E) 7(E) 10(E) 15(E) 9 10* 15(E) Remarks: 1. Non-foundation questions are underlined.. Integrated questions are labelled by *. 3. Questions requiring eplain your answer are indicated by (E). III
2 19. The total weight of the wastes W(n) (in thousand tonnes) produced by a city in the nth year since the beginning of 011 is given by W(n) ab n, where n is a positive integer, a and b are positive constants. It is found that the total weights of the wastes in 011 and 01 are thousand tonnes and thousand tonnes respectively. (a) (i) Find a and b. (ii) Epress, in terms of n, the total weight of the wastes produced by the city in the first n years since the beginning of 011. Hence, find the total weight of the wastes produced by the city in the first 5 years since the beginning of 011. (Give the answer correct to the nearest thousand tonnes.) (iii) The remaining space of the landfill at the end of 010 can hold thousand tonnes of wastes. In which year will the landfill be full? (8 marks) (b) At the beginning of 016, an incinerator starts to operate. Let B(m) thousand tonnes be the total weight of the wastes handled by the incinerator in the mth year since its operation, where m is a positive integer. It is given that B(m) 5ab m. Assume that the residue after incinerating can be neglected. Will the landfill be full in 01? Eplain your answer. (4 marks) CP MOCK PAPER Achiever Page total
3 SECTION B (35 marks) 15. The bo-and-whisker diagram below shows the distribution of the scores (in marks) of the students of a class in a test. James gets the highest score while John gets the lowest score in the test. The standard scores of James and John in the test are.4 and -.8 respectively. (a) Find the mean of the distribution. ( marks) (b) A student claims that the standard scores of at least half of the students in the test are positive. Do you agree? Eplain your answer. ( marks) CP MOCK 3 PAPER Go on to the net page Page total
4 14. The figure shows the graph of the straight line a + by Which of the following is/are true? I. b < 0 II. a > 0 III. a < -1 A. I only B. I and II only C. I and III only D. II and III only 15. In the figure, a square is divided into nine smaller identical squares and one of them is shaded. If one of the eight remaining squares is shaded, how many ways are there such that the resulting figure has reflectional symmetry? A. 1 B. C. 4 D In the figure, the area of the shaded region is 3 cm. If AOB 100, where O is the centre of the circle, find the radius of the circle correct to 0.01 cm. A..80 cm B..81 cm C..8 cm D..83 cm Go on to the net page CP MOCK 3 PAPER Achiever
5 33. The figure above shows the linear relation between and log y. Which of the following graphs may represent the relation between and y? A. B. C. D. 34. If a + log b a + log b , then b A. 4. B. 1. C. 1 or 16. D. -1 or 4. Go on to the net page CP MOCK 3 PAPER Achiever
6 Top 15 Question Types Top 15 Question Types Among the DSE Eam Papers (013, 01, Practice Papers (PP), Sample Papers(SP)), the top 15 question types are summarized as follows: Question Type 1 Laws of indices Eample: Simplify ( y ) 5 7 y and epress your answer with positive indices. Solution: ( y ) 5 7 y y y 8 4 y 5 7 y D i f f e r e n t f o r m s o f the selected question types are included with reference to DSE eam papers. DSE reference 013 (I Q1) 013 (II Q1) 01 (I Q1) 01 (II Q1) PP (I Q1) PP (II Q1) SP (I Q1) SP (II Q1) First, practice the corresponding questions in DSE eam papers. Then try the similar questions in this Mock Eam Power Pack. Mock 1 Mock Mock 3 Mock 4 Mock 5 Mock 6 I II I II I II I II I II I II Try Q1 Q1 Q1 Q1 Q1 Q1 Q1 Q1 Q1 Q1 Q1 Q1 5
7 Mathematics Mock Eam Power Pack (Compulsory Part) Eam Success Key Eample: Epress i in the form a + bi. 1 i Display Key-in sequence ( SHIFT ENG ) ( 1 SHIFT ENG ) EXE -1 SHIFT EXE (The real part) (The imaginary part) \ 3 + 4i 1 i 1+ i 0 Quadratic Formula For the quadratic equation a + b + c 0, a 0, the solutions are b b ac given by the quadratic formula ± 4. a Program Editing Step 1: MODE MODE MODE 1 [PRGM mode] Step : P1 or P or P3 or P4 Step 3: Lbl 0:? A:? B:? C: B - 4AC D: D 0 Goto 1: D > 0 Goto : Lbl : (- B - D) (A) X: X Lbl 1: (- B + D) (A) X: X Step 4: AC MODE MODE MODE Program Eecution Step 0: MODE MODE MODE [RUN mode] You may skip this step if you are already in RUN mode. Step 1: MODE 1 [COMP mode]
8 Mathematics Mock Eam Power Pack (Compulsory Part) Eam Success Key Useful Formulas Junior Secondary Junior 1. Estimation, Approimation and Errors (a) Absolute error estimated value - eact value (b) Maimum absolute error largest possible uncertainty of an estimation or a measurement Maimum absolute error (c) Relative error or Measured value Absolute error Eact value (d) Percentage error Relative error 100%. Percentages New value - Original value (a) Percentage change 100% Original value (b) (i) New value Original value (1 + Percentage increase) (ii) New value Original value (1 - Percentage decrease) (c) Profit and loss Selling price - Cost price Percentage change 100% Cost price If the percentage change > 0, then there is a profit. If the percentage change < 0, then there is a loss. (d) Selling price Cost price (1 + Profit percentage) or Cost price (1 - Loss percentage) (e) Discount percentage Marked price - Selling price Marked price 100% (f) Selling price Marked price (1 - Discount percentage) 36
9 Mathematics Mock Eam Power Pack (Compulsory Part) Solution Guide 17. (a) b a + 1A (1) (b) The equation of L: y 0 (tan 45 ) ( 0) y The equation of C: ( a) + (y b) b a + a + y by + b b + y a by + a 0 Substituting y into the equation of C, + a b + a 0 - (a + b) + a 0 The -coordinate of the mid-point of PQ ( a + b) a + b a + ( a + ) (by (a)) a + 1 The coordinates of the mid-point of PQ (a + 1, a + 1) 1A Alternative Solution Equation of L: y 0 (tan 45 ) ( 0) y The equation of the straight line passing through the centre of C and perpendicular to L: y b 1 a 1 ( ) Substituting y into y b 1 a 1 ( ), b ( a) a + b a + b a + a + (by (a)) a + 1 The coordinates of the mid-point of PQ (a + 1, a + 1) 1A 18. (a) In DTAC, TC tan18 AC h AC tan18 In DTBC, TC tan BC h BC tan m m In DABC, by the cosine formula, AB + BC ( AB)( BC)cos 35 AC h tan h h tan 18 ( 800) cos 35 tan 1 1 tan tan 18 h 0 cos 35 ( 800) tan h h or (rejected) h 168 (cor. to the nearest integer) 1A 1A 1A (5) (b) Let P be the point on AB such that the CP AB, then CP is the shorest distance between C and AB. TPC is the greatest angle of elevation of T from Jenny when she walk from A to B. In DBCP, CP BC sin 35 CP h sin 35 tan TC tan TPC CP h h sin 35 tan tan sin 35 TPC 35. (cor. to 3 sig. fig.) 1A 18 Angle of elevation 35. 1A (5) (5) 4 Achiever
10 Mathematics Mock Eam Power Pack (Compulsory Part) Solution Guide. A In the figure, M is a point on PQ such that RM PQ and k is a non-zero constant. PM QM (property of isos. D) Hence, we have PM : PR 5 : 13 5 \ cos P 13 For II, the radius of C + 3 Distance between (1, 1) and (, ) ( 1) + ( 1) 8 < 3 Hence, (, ) lies inside C. \ II is true. For III, the slope of the line passing through (0, 0) and (1, 1) The slope of AB -1 (line from centre to mid-pt. of chord chord) \ III is true. 8 3 By cosine formula, ( 13k ) ( 10k ) + ( 13k ) ( 10k )( 13k )cos P 100 k 60 k 5 cos P 13 cos P 3. B For I, sin( 90 ) cos 1 cos cos \ I is true. For II, when 60, tan - tan(90 - ) tan60 - tan30 > 0. \ II may not be true. For III, and are both acute angles and >, hence tan > tan. \ III is true. 6. A Second number First number From the above table, the required probability 0 P(difference is even) P(both odd or both even) C Let P (, y). PX 4PY ( - 0) + (y - 5) 4[( - 1) + (y - 0) ] + y - 10y + 5 4( y ) 3 + 3y y D The equation of C in the general form is + y y 0. 3 For I, the centre of C is (1, 1). \ I is not true. 7. B Since the mode is 7, at least one of a and b is 7, say a 7. Since the median is 4.5, five numbers are smaller than or equal to 4.5 and they are 0, 1,, 3, 4. Since the 5th datum is 4, the 6th datum must be 5, we have b Mean 10 4 Achiever 4. 4
1 32, 33, , 33, , , , 17, 22 15, 16, 17 16, 17, , 16, 17 18, 19, 20
DSE 01 DSE 01 DSE 015 DSE 016 A B A B A B A B 6 11 6, 1, 5, 10, 11 9, 10 9, 10 10,, 8, 1, 5, 9 1 1 1 6 1 6 5, 8, 7 5, 8 7 5 5, 8 8, 9 1, 1 1, 1 11, 1 11, 1, 1 8 1 7 1 7 1 6 1,, 1,, 1 5 7 6, 7 6 6 7 5 15,
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