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# KNEC KCSE Past Papers Maths A 2015

## KNEC KCSE Past Papers Maths A 2015

KCSE Past Papers Maths A 2015

Paper 1 Date

Instructions to candidates

(a) Write your name and index number in the spaces provided above.

(b) Sign and write the date of examination in the spaces provided above,

(c) This paper consists of two sections: Section I and Section II.

(d) Answer all the questions in Section I and only ﬁve questions from Section II.

(e) Show all the steps in your calculations, giving your answers at each stage in the spaces provided below each question.

(f) Marks may be given for correct working even if the answer is wrong.

(g) Non-programmable silent electronic calculators and KNEC Mathematical tables may be used, except where stated otherwise.

(h) This paper consists of 20 printed pages. (i) Candidates should check the question paper to ascertain that all the pages are printed as indicated and that no questions are missing.

(j) Candidates should answer the questions in English.

SECTION I (50 marks) Answer all the questions in this section in the spaces provided. 1. (a) Evaluate 540 396 — 726450/ 3 (l mark)

(b) Write the total value of the digit in the thousands place of the results obtained in (a) above. (1 mark)

2. Muya had a 62/3ha piece of land. He donated 7/8ha to a school and 11/2ha to a children’s home. The rest of the land was shared equally between his son and daughter. Find the size of land that each child got. (3 marks)

3. The volume of a cube is l728 cm3. Calculate, correct to 2 decimal places, the length of the diagonal of a face of the cube. (3 marks)

4. Use logarithms, correct to 4 signiﬁcant ﬁgures, to evaluate

(4 marks)

5. A piece of Wire is bent into the shape of an isosceles triangle. The base angles are each 48° and the perpendicular height to the base is 6 cm. Calculate, correct to one decimal place, the length of the wire. (3 marks)

6. The density of a substance A is given as 13.6 g/cm’ and that of a substance B as 11.3 g/cm3. Determine, correct to one decimal place, the volume of B that would have the same mass as 50 cm3 of A. (3 marks)

7. Below is part of a sketch of a solid cuboid ABCDEFGH. Complete the sketch. (2 marks)

8. A salesman is paid a salary of Ksh 15 375 per month. He also gets a commission of 4½ on the amount of money he makes from his sales. In a certain month, he earned a total of Ksh 28 875. Calculate the value of his sales that month. (3 marks)

9. The sum of interior angles of a regular polygon is 24 times the size of the exterior angle.

(a) Find the number of sides of the polygon. (3 marks)

(b) Name the polygon. (1 mark)

10. The marks scored by a group of students in a test were recorded as shown in the table below.

On the grid provided, and on the same axes, represent the above data using:

(a) a histogram; (3 marks)

(b) a frequency polygon. (1 mark)

ll. Given that P = 5a — 2b where a = and b = Find:

(a) column vector P; (2 marks)

(b) P’, the image of P under a translation vector (1 mark)

12. Given that a = 3, b = 5 and c =- ½ evaluate (3 marks)

13. The ﬁgure below represents the curve of an equation.

Use the mid-ordinate rule with 4 ordinates to estimate the area bounded by the curve, lines y=0,x= -3 and x=5. (3 marks)

14. The cost of 2 jackets and 3 shirts was Ksh 1 800. After the cost of a jacket and that of a shirt were increased by 20%, the cost of 6 jackets and 2 shirts was Ksh 4 800. Calculate the new cost of a jacket and that of a shin. (4 marks)

15. A tailor had a piece of cloth in the shape of a trapezium. The perpendicular distance between the two parallel edges was 30 cm. The lengths of the two parallel edges were 36 cm and 60 cm. The tailor cut off a semi circular piece of the cloth of radius 14cm from the 60 cm edge. Calculate the area of the remaining piece of cloth. (3 marks)

16. Musa cycled from his home to a school 6km away in 20 minutes. He stopped at the school for 5 minutes before taking a motorbike to a town 40km away. The motorbike travelled at 75 km/h. On the grid provided, draw a distance-time graph to represent Musa’s journey. (3 marks)

SECTION II(50 marks)

Answer any ﬁve questions in this section in the spaces provided.

17 Three partners Amina, Bosire and Karuri contributed a total of Ksh 4 800 000 in the ratio 4:5:7 to buy an 8 hectares piece of land. The partners set aside i of the land for social amenities and sub-divided the rest into 15 m by 25 m plots.

(a) Find:

(i) the amount of money contributed by Karuri; (2 marks)

(ii) the number of plots that were obtained. (3 marks)

(b) The puma: sokl the plots at Ksh 50000 each and spent 30% of the proﬁt realised to pay for administrative costs. They shared the rest of the proﬁt in the ratio of their contributions.

(i) Calculate the net proﬁt realised. (3 marks)

(ii) Find the difference in the amount of the proﬁt eamed by Amina and Bosire. (2 marks)

18. Two shopkeepers, Juma and Wanjiku bought some items from a wholesaler. Juma bought 18 loaves of bread, 40 packets of milk and 5 bars of soap while Wanjiku bought 15 loaves of bread, 30 packets of milk and 6 bars of soap. The prices of a loaf of bread, a packet of milk and a bar of soap were Ksh 45, Ksh 50 and Ksh 150 respectively.

(a) Represent:

(i) the number of items bought by Juma and Wanjiku using a 2 X 3 matrix. (1 mark)

(ii) the prices of the items bought using a 3 X 1 matrix. (1 mark)

(b)Use the matrices in (a) above to determine the total expenditure incurred by each person and hence the difference in their expenditure. (3 marks)

(c) Juma and Wanjiku also bought rice and sugar. Jurna bought 36 kg of rice and 23 kg of sugar and paid Ksh 8 160. Wanjiku bought 50 kg of rice and 32 kg of sugar and paid Ksh 11 340. Use the matrix method todetermine the price of one kilogram of rice and one kilogram of sugar. (5 marks)

19. Line AB drawn below is a side Of a triangle ABC.

(a) Using a pair of compasses and ruler only construct:

(i) triangle ABC in which BC = 10 cm and CAB = 90°; (2 marks)

(ii) a rhombus BCDE such that CBE = 120°; (2 marks)

(iii) a perpendicular from F, the point of intersection of the diagonals of the rhombus, to meet BE at G. Measure F G; (2 marks)

(iv) a circle to touch all the sides of the rhombus. (1 mark)

(b) Determine the area of the region in the rhombus that lies outside the circle. (3 marks)

20. In the ﬁgure below, AC = 12 cm, AD = 15 cm and B is point on AC. BAD = ADB = 30°.

Calculate, correct to one decimal place:

(a) the length of CD; (3 marks)

(b) the length of AB; (3 marks)

(c) the area of triangle BCD; (2 marks)

(d) the size of £BDC. (2 marks) 21. (a) A straight line L1 whose equation is 3y -— 2x = -2 meets the x-axis at R. Determine the co-ordinates of R. (2 marks)

(b) A second line L2 is perpendicular to L] at R. Find the equation of L2 in the form y = mx + c, where m and c are constants. (3 marks)

(c) A third line L3 passes through (-4, 1) and is parallel to Ll. Find:

(i) the equation of L3 in the form y = mx + c, where m and c are constants. (2 marks)

(ii) the co-ordinates of point S, at which L3 intersects L2. (3 marks)

22. On the grid below, an object T and its image T’ are drawn.

(a) Find the equation of the mirror line that maps T onto T’. (1 mark)

(i) T’ is mapped onto T” by positive quarter tum about (0, 0). Draw T”. (2 marks)

(ii) Describe a single transformation that maps T onto T”. (2 marks)

T” is mapped onto T”’ by an enlargement, centre (2, 0), scale factor -2. Draw T”’. (2 marks)

Given that the area of T’” is 12 cm’, calculate the area of T. (3 marks)

23. The ﬁgure below represents a conical ﬂask. The ﬂask consists of a cylindrical part and a frustum of a cone. The diameter of the base is 10 cm while that of the neck is 2 cm. The vertical height ofthe ﬂask is 12 cm.

Calculate, correct to l decimal place:

(a) the slant height of the frustum part; (2 marks)

(b) the slant height of the smaller cone that was cut off to make the frustum part. (2 marks)

(c) the external surface area of the ﬂask. (Take pie = 3.142) (6 marks)

24. The gradient of the curve

(a) Find:

(i) the value of p; (3 marks)

(ii) the equation of the tangent to the curve at x = 0.5.’ (4 marks)

(b) Find the co-ordinates of the turning points of the curve. (3 marks)

Paper 2

Instructions to candidates

(a) Write your name and index number in the spaces provided above.

(b) Sign and write the date of examination in the spaces provided above,

(c) This paper consists of two sections: Section I and Section II.

(d) Answer all the questions in Section I and only ﬁve questions from Section II.

(e) Show all the steps in your calculations, giving your answers at each stage in the spaces provided below each question.

(f) Marks may be given for correct working even if the answer is wrong.

(g) Non-programmable silent electronic calculators and KNEC Mathematical tables may be used, except where stated otherwise.

(h) This paper consists of 20 printed pages. (i) Candidates should check the question paper to ascertain that all the pages are printed as indicated and that no questions are missing.

(j) Candidates should answer the questions in English.

SECTION I (50 marks)

Answer all the questions in this section in the spaces provided.

1. The length and width of a rectangular piece of paper were measured as 60 cm and 12 cm respectively. Determine the relative error in the calculation of its area. (4 marks)

2. Simplify

(2 marks)

3. An arc ll cm long, subtends an angle of 70° at the centre of a circle. Calculate the length, correct to one decimal place, of a chord that subtends an angle of 90° at the centre of the same circle. (4 marks)

4. In the ﬁgure below, O is the centre of the circle. A, B, C and D are points on the circumference of the circle. Line AB is parallel to line DC and angle ADC = 55°.

Determine the size of angle ACB. (3 marks)

5. Eleven people can complete of a certain job in 24 hours. Determine the time in hours, correct to 2 decimal places, that 7 people working at the same rate can take to complete the remaining job. (3 marks)

6 The length and width of a rectangular signboard are (3x +12) cm and (x — 4) cm respectively. If the diagonal of the signboard is 200 cm, determine its area. (4 marks)

8. Use the expansion of (x — y)5 to evaluate (9.8)5 correct to 4 decimal places. (3 marks)

9. The diameter of a circle, centre O has its end points at M(— 1, 6) and N(5, —2). Find the equation of the circle in the form x2 + yl + ax + by = c where a, b and c are constants. (4 marks)

Find the value of x given that log (x — 1) + 2 = log (3x + 2) + log 25. (3 marks)

10. Below is a line AB and a point X. Determine the locus of a point P equidistant from points A and B and 4 cm from X.(3 marks)

11. In a nomination for a committee, two people were to be selected at random ﬁ’0m a group of 3 men and 5 women. Find the probability that a man and a woman were selected. (2 marks)

12. A school decided to buy at least 32 bags of maize and beans. The number of bags of maize were to be more than 20 and the number of bags of beans were to be at least 6. A bag of maize costs Ksh 2500 and a bag of beans costs Ksh 3500. The school had Ksh 100 000 to purchase the maize and beans. Write down all the inequalities that satisfy the above information. (4 marks)

13. Evaluate

. (3 marks)

14. The positions of two points P and Q, on the surface of the earth are P(45 °N, 36 °E) and Q(45 °N, 71°E). Calculate the distance, in nautical miles, between P and Q, correct to 1 decimal place. (3 marks)

15. Solve the equation sin (½x — 30°) = cos x for 0 < x < 90°. (2 marks)

16. The position vectors of points P, Q and R are

, Show that P, Q and R are collinear. (3 marks)

SECTION II (50 marks)

Answer any ﬁve questions from this section in the spaces provided.

17. In a retail shop, the marked price of a cooker Was Ksh 36 000. Wanandi bought the cooker on hire purchase tenns. She paid Ksh 6400 as deposit followed by 20 equal monthly instalments of Ksh 1750.

(a) Calculate:

(i) the total amount of money she paid for the cooker. (2 marks)

(ii) the extra amount of money she paid above the marked price. (l mark)

(b) The total amount of money paid on hire purchase terms was calculated at a compound interest rate on the marked price for 20 months. Determine the rate, per annum, of the compound interest correct to 1 decimal place. (4 marks)

(c) Kaloki borrowed Ksh 36 000 from a ﬁnancial institution to purchase a similar cooker. The ﬁnancial institution charged a compound interest rate equal to the rate in (b) above for 24 months. Calculate the interest Kaloki paid correct to the nearest shilling. (3 marks)

18. Mute cycled to raise funds for a charitable organisation. On the ﬁrst day, he cycled 40 km. For the ﬁrst 10 days, he cycled 3 km less on each subsequent day. Thereafter, he cycled 2 km less on each subsequent day.

(a) Calculate:

(i) the distance cycled on the 10th day; (2 marks)

(ii) the distance cycled on the 16th day. (3 marks)

(b) If Mute raised Ksh 200 per km, calculate the amount of money collected. (5 marks)

19. The equation of a curve is given by y = 1 + 3 sin x. (a) Complete the table below for y = 1 + 3 sin x correct to 1 decimal place (2 marks)

(b) (i) On the grid provided, draw the graph of (3 marks)

(ii)State the amplitude of the curve y = 1 + 3 sin x. (1 mark)

(d) Use the graphs to solve the equation (l mark)

(c) On the same grid draw the graph of y = tan x for 90° 5x 5 270° (3 marks)

20. The ﬁgure below represents a cuboid EFGHJKLM in which EF = 40 cm, FG = 9 cm and GM = 30 cm. N is the midpoint of LM.

Calculate correct to 4 signiﬁcant ﬁgures:

(a) the length of GL; (1 mark)

(b) the length of F]; (2 marks)

(c) the angle between EM and the plane EFGH; (3 marks)

(d) the angle between the planes EFGH and ENH; (2 marks)

(e) the angle between the lines EH and GL. (2 marks)

21. A quantity P varies partly as the square of m and partly as n. When P = 3.8, m = 2 and n = -3. When P = -0.2,m = 3 and n = 2.

(a) Find:

(i) the equation that connects P, m and n; (4 marks)

(ii) the value of P when m = 10 and n = 4. (1 mark)

(b) Express m in terms of P and n. (2 marks)

(c) If P and n are each increased by 10%, ﬁnd the percentage increase in m correct to 2 decimal places. (3 marks)

22. A particle was moving along a straight line. The acceleration of the particle after t seconds was given by . The initial velocity of the particle was 7 .

Find:

(a) the velocity (v) of the paiticle at any given time (t); (4 marks)

(b) the maximum velocity of the particle; (3 marks)

(c) the distance covered by the particle by the time it attained maximum velocity. (3 marks)

23. The marks scored by 40 students in a mathematics test were as shown in the table below.

(a) Find the lower class boundary of the modal class. (1 mark)

(b) Using an assumed mean of 64, calculate the mean mark. (3 marks)

(C) (i) On the grid provided, draw the cumulative frequency curve for the data. (3 marks)

(ii) use the graph to estimate the semi—interquartile range (3 marks)

24. A quadrilateral with vertices at K(1, 1), L(4, 1), M(2, 3) and N(1, 3) is transformed by a matrix

(a) Determine the coordinates of the image (3 marks)

(b) On the grid provided draw the object and the image. (2 marks)

(c) (i) Describe fully the transformation which maps KLMN onto K’ L’ M’N’. (2 marks)

(ii) Determine the area of the image; (1 mark)

(d) Find a matrix which maps K’ L’M’N’ onto KLMN. (2 marks)