Mathematics Paper 1 Questions and Answers - Kenya High Post Mock 2023 Exams

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INSTRUCTIONS 

  • This paper consists of two sections: Section I and Section II.
  • Answer ALL questions in section 1 and ONLY FIVE questions from section II
  • Show all the steps in your calculation, giving your answer at each stage in the spaces below each question.
  • Non – Programmable silent electronic calculators and KNEC mathematical tables may be used, except where stated otherwise.


QUESTIONS

SECTION I
Answer all the questions in the spaces provided.

  1. Evaluate without using tables or calculators (2mks)
    6/7 of 14⁄3 ÷ 80 x -20⁄3
    -2 x 5 ÷ (14 ÷ 7 ) x 3
  2. The line y = 3x + 3 meets the line L1 at the point (2, 9) and at right angles. Find the points at which the two lines intersect with the x- axis. (3mks)
  3. Given that p=5a – 2b where a = 3 8 find :
    1. Column vector p. (2mks)
    2. P΄ the image of p under a translation vector 3b 2 (1mk)
  4. Solve the following inequalities and represent the solution on a number line. (3mks)
    4x – 3 ≤ 6x -1 < 3x + 8
  5. The figure below shows a triangular prism of uniform cross section. AF=FB= 4cm. AB=7cm, BC= 12cm. given that angle BAF=30o, find the total surface area of the prism. (3mks)
    5 3
  6. Use tables of cubes, cubes roots and reciprocals to evaluate; (4mks)
    6 6
  7. The density of a substance A is given as 13.6g/cm3 and that of a substance B as 11.3g/cm3. Determine, correct to one decimal place, the volume of B that would have the same mass as 50cm3 of A. (3mks)
  8. Find x in 2(4x) – 10 (2x) + 8 = 0 (3mks)
  9. The sum of interior angles of a regular polygon is 24 times the size of the exterior angle.
    Find the number of sides of the polygon. (3mks)
  10. Triangle ABC has its vertices at A(3, 0), B(2,3) and C(5,1) if A΄(5, 0), B΄(3,6) and C΄(9,2) is the image of ABC under enlargement. On the same axes and grid provided below, determine the centre of enlargement and linear scale factor. (3mks)
    10 3
  11. The following measurements were recorded in a field book of a farm using XY as the base line XY=400M.
    11 4
    Using a suitable scale, draw an accurate map of the farm. (4mks)
  12. Waceke is a saleslady. She is paid Ksh15,375 per month. She is also paid a commission of 4 ½ % on the amount of money she makes from her sales. In a certain month, she earned a total of Ksh. 28,875. Calculate the value of her sales that month. (3mks)
  13. Two buses P and Q leave Kisumu at 7.30am and 9.30am respectively. If their speeds are 60km/h and 100km/h respectively,find when Q catches up with P. (3mks)
  14. The figure below shows a solid cone. It has a cylindrical hole drilled into it. The diameter of the hole is 7cm and its height 8cm. The radius of the cone is 10.5cm and its vertical height is 15cm.
    14 2
    Calculate the volume of the solid. (3mks)
  15. Simplify completely: (3mks)
    (a +2b)2 – ( 2a – b)2
    ab2 – a2
  16. The figure below represents a speed time graph for a cheetah in 40 seconds.
    Calculate the total distance covered by the cheetah. (3mks)
    16 2

SECTION II
Answer any five questions in this section.

  1. A rectangular tank whose internal dimensions are 2.4m by 2.5m by 3.7m is two thirds full of juice.
    1. Calculate the volume of the juice in litres. (3mks)
    2. The juice is parked in small packets in a shape of right pyramid with equilateral triangles of sides 20cm. the height of each packet is 15cm. a full packet is sold at kshs. 50 per packet.
      Calculate:
      1. The volume of the juice in cm3 of each packet to the nearest whole number. (3mks)
      2. The number of full packets of juice. (2mks)
      3. The amount of money realized from the sale of juice. (2mks)
  2. The masses in kilograms of patients who attended a clinic on a certain day were recorded as follows.

    67

    49

    57

    58

    69

    58

    39

    61

    51

    47

    38

    59

    46

    52

    60

    72

    59

    49

    54

    52

    69

    62

    58

    67

    63

    59

    65

    58

    49

    44

    49

    41

    70

    58

    54

    60

    60

    59

    42

    41

    79

    52

    51

    48

    54

    59

    62

    73

    48

    54


    1. Starting with the class 35-39, make a frequency distribution table for the data. (2mks)
    2.  
      1. Calculate the mean mass. (3mks)
      2. Calculate the median mass. (3mks)
    3. On the grid provided draw a frequency polygon to represent the data. (2mks)
      10 3
  3. The position vectors of A, B and C are 3i – 2j, -6i + 4j and -9i – 3j respectively.
    1. State the column vectors.
      1. AB (2mks)
      2. CB (2mks)
    2. Find the distance from A to C. (2mks)
    3. Find the coordinates of the mid point of AC. (2mks)
    4. If point C΄ is the image of C under translation vector 18d
      Find the co-ordinates of C΄. (2mks)
  4. Complete the table below for the function y= x2– 3x + 6 in the range -2 ≤ x ≤ 8. (2mks)

    X

    -2

    -1

    0

    1

    2

    3

    4

    5

    6

    7

    8

    Y

                         
     
    10 3
    1. Use the trapezium rule with 10 strips to estimate the area bounded by the curve, y=x2− 3x + 6, the lines x = -2, x =8 and the x – axis. (3mks)
    2. Use the mid – ordinate rule with 5 strips to estimate the area bounded by the curve, y = x2 – 3x + 6, the lines x = -2, x = 8 and the x- axis. (3mks)
    3. By integration, determine the actual area bounded by the curve y = x2 – 3x + 6, the lines x = -2, x = 8, and the x – axis. (3mks)
  5. The corner points A, B, C and D of a ranch are such that B is 8km directly East of A and C is 6km from B on a bearing of 30o. D is 7km from C on a bearing of 300o.
    1. Using a scale of 1cm to represent 1km, draw a diagram to show the positions of A, B, C and D. (4mks)
    2. Use the scale drawing to determine:
      1. The bearing of A from D. (1mk)
      2. The distance BD in kilometers. (2mks)
      3. The perimeter of the ranch in kilometers. (3mks)
  6. Johana and MuchirucontributesKsh. 150,000 and Ksh. 180,000 every year respectively for a business, after one year Jacob joined the business and contributed Ksh. 135,000.
    1. Calculate the ratio of their investment after three years of business. (3mks)
    2. They agreed that 30% of the profits after 3 years be used to cater for the costs of running the businesses while the remaining would be shared proportionally. Calculate each person’s share if the profit after 3 years was shs. 240,000. (4mks)
    3. If each re-invested their shares back into the business, find the new individual investment at the beginningof the fourth year. (3mks)
  7. The figure below shows the end wall of a building with the axes shown and 1M as the unit of measurement. The roof line is given by y= a + bx2, where a andb are constants.
    23 2
    1. State the value of a. (1mk)
    2. Calculate the value of b. (3mks)
    3. Calculate the values of y for x = 2, 4, 6, 8 and compete the table below. (2mks)

      X

      -10

      0

      2

      4

      6

      8

      10

      Y

      9

      15

             

      9

    4. Calculate the area of the wall. (4mks)
  8. A ball is thrown upwards and its height after t seconds is 5 meters, where s = 20t – 5t2. Find
    1. The greatest height reached and the time when it is reached. (3mks)
    2. The time when it returns to the original level. (3mks)
    3. Its velocity after 3 seconds. (2mks)
    4. Its acceleration during the throw. (2mks)


MARKING SCHEME

  1. Evaluate without using tables or calculators (2mks)
    6⁄7 of 14⁄3 ÷ 80 x -20⁄3
    -2 x 5 ÷ (14 ÷ 7 ) x 3

    6⁄7 x 14⁄3 = 4
    4 ÷ 80 = 4⁄80
    4⁄80 x = 20⁄3=-1⁄3
    -2 x5 ÷ 2 x 3
    -2 x 5/2 x 3
    -15
    -1⁄3
    -15
    -1⁄3÷-15⁄1              M1 – num/den
    -1⁄3 x 1⁄45             M1 – single fraction
    =1⁄45                  A1
                              3
  2. The line y = 3x + 3 meets the line L1 at the point (2, 9) and at right angles. Find the points at which the two lines intersect with the x- axis. (3mks)
    G1=3             3y= -x +29                 for L2
    G2=-1⁄3          y= -1⁄3 x + 29⁄3        0= -1⁄3x + 29⁄3
    Equation L2    at x –axis, y=0          1⁄3x=29⁄3
    y-9 = -1           4→ 0= 3x + 3              x = 29                             M1- gradient
    x-2     3                    3x = -3                       (29,0)                      M1 – Equations a+y=0
    3y – 27 = -x +2    x = 11                                                         A1- both intercepts
                                 ( -1, 0)
  3. Given that p=5a – 2b where a =3 8 find :
    1. Column vector p. (2mks)
      3a 2
    2. P΄ the image of p under a translation vector 3b 2 (1mk)
      3bans
      =-3
         12
  4. Solve the following inequalities and represent the solution on a number line. (3mks)
    4x – 3 ≤ 6x -1 < 3x + 8
    1. Ux – 3 ≤6x – 1
      -2x ≤ 2                                                                       M1- both solutions
      x≥-1                                                                           B1- compound statement
    2. 6x -1<3x+8                                                                 B1- correct number line
      3x<9 3
      X<3
      -1≤x<3
      4 1
  5. The figure below shows a triangular prism of uniform cross section. AF=FB= 4cm. AB=7cm, BC= 12cm. given that angle BAF=30o, find the total surface area of the prism. (3mks)
    5 3
    Area of Δ faces = ½ x 4x 4 x sin120x2                                           M1- cross sector faces
    = 13.856                                                                                         M1- other faces
    = 14cm2                                                                                         A1- Area got
    Area of rectangles = 12 x 4x2+12x6                                                     3
    = 96+72
    =168
    Total S.A =168+13.856
    = 181.856 accept 182cm2
    = 181.9cm

    Alternative
    h=√42 - 352
    =√16-12.25
    =1.94cm
    Area of triangular
    Faces = ½ x 1.94 x 7x2
    =13.587cm2
    Total = 168+13.587
    =181.58 = 181.6cm2
  6. Use tables of cubes, cube roots and reciprocals to evaluate: (4mks)
    6y
    (2.35 x 101)3  6 6
                                                                                                  M1-all logs
    12.978 x 103 – 1.64 x 10 + 0.1408 x 103                               M1 – addition & subtraction
    12,978 – 16.4 + 140.8 = 13,102.4                                          M1- multiplication
                                                                                                    A1
                                                                                                      4
  7. The density of a substance A is given as 13.6g/cm3 and that of a substance B as 11.3g/cm3. Determine, correct to one decimal place, the volume of B that would have the same mass as 50cm3 of A. (3mks)
    D = m/v
    Mass of A = 50cm3 x 13.6g/cm=3680g
    Mass of B = 680g                                                                              M1-masses got
    Density = 11.3g/cm3                                                                         M1- vol. expressed
    Volume of B = 680g                                                                           A1
                           11.3g/cm3                                                                    3
    = 60.2cm3
  8. Find x in 2(4x) – 10 (2x) + 8 = 0 (3mks)
    4x-5(2x) + 4 =0                  u2- 4u – u + 4 = 0              also:
    (22)x – 5 (2x)+4 = 0           u(u – 4) -1 (u – 4) = 0        2x=4=22         M1- common base
    Let 2x be u                        (u – 1 ) (u – 4) = 0              x =2                M1-quadratic eqn
    U2 – 5u + 4 =0                   u = 1 or 4                          x =0                 A1- both
    (-4, -1)                                2x= 1 = 2                      and                  3
                                              X = 0                                 2
  9. The sum of interior angles of a regular polygon is 24 times the size of the exterior angle.
    Find the number of sides of the polygon. (3mks)
    1. (2n – 4) 90= 24 x 360/n
      180n – 360 = 8640

                               n
    2. 180n2 – 360n = 8640
      n2 – 2n – 48 =0
      -48 = -8 x 6
      -2 = -8+6
      (n – 8) (n + 6) = 0
      n=8                                                                               M1-equating
      Or                                                                                 M1 – single equation
      -6                                                                                  A1
      8 sides                                                                          3
  10. Triangle ABC has its vertices at A(3, 0), B(2,3) and C(5,1) if A΄(5, 0), B΄(3,6) and C΄(9,2) is the image of ABC under enlargement. On the same axes and grid provided below, determine the centre of enlargement and linear scale factor. (3mks)
    10 3

                                                                                                  B1-Both Ds drawn
                                                                                                  B1-centre identified
                                                                                                  B1-LSF
                                                                                                  3

  1. The following measurements were recorded in a field book of a farm using XY as the base line XY=400M.
    11 4
    Using a suitable scale, draw an accurate map of the farm. (4mks)
    using
    B1-suitable scale
    B1-base line xy(Check accuracy
    B1-offsets drawn(check accuracy)
    B1-offsets named
    4
  2. Waceke is a saleslady. She is paid Ksh 15,375 per month. She is also paid a commission of 4 ½ % on the amount of money she makes from her sales. In a certain month, she earned a total of Ksh. 28,875. Calculate the value of her sales that month. (3mks)
    Earnings on sales = 28875 – 15375
    = sh 13,500
    4 ½ % of y = 13500
    Y= 100 x 13500
          4.5 
    Y = sh 300,000
  3. Two buses P and Q leave Kisumu at 7.30am and 9.30am respectively. If their speeds are 60km/h and 100km/h respectively, find when Q catches up with P. (3mks)
    Distance by p in 2hrs             alternative method                  y= 180km
    60 x 2 = 120km                        13 5                                             time= 180 =3hrs
    RS= 100-60                                                                                     60
    = 40Km/hr                             distance by P = y km              time to catch
    Time to overtake                   time = (y/60)hrs                      up = 9.30 + 3
    = 120 = 3hrs                         distance by Q = 120 + y          = 12.30p.m
        40 time                              = [120 + y]
    9.30 +3hrs                                  100
    12.30p.m                              100y = 7200 + 60y
                                                  40y = 7200
  4. The figure below shows a solid cone. It has a cylindrical hole drilled into it. The diameter of the hole is 7cm and its height 8cm. The radius of the cone is 10.5cm and its vertical height is 15cm.
    14 2
    Calculate the volume of the solid. (3mks)
    Volume of the cone – volume of cylinder
    1/3 πR2H – πr2h
    π(1/3 x 10.52 x 15 – 3.52x8) A1π(551.25 – 98)
    453.25π
    =1424.5cm3
  5. Simplify completely: (3mks)
    (a +2b)2 – ( 2a – b)2
            ab2 – a2
    let a + 2b =x                          (3a +b) (3b –a)

    2a – b = y                              (3b +a) (3b-a)
    x2-y2= (x + y) (x-y)                     3a+b
    (a+2b+2a-b) (a+2b-(2a-b))         3b+a
    (3a+b) (-a+3b)
    (3a+b) (3b-a)                                                              M1-factors expressed in num/den
    (3b)2 –a                                                                   M1-single fraction
    (3b+a)(3b-a)                                                               A1
                                                                                       3
  6. The figure below represents a speed time graph for a cheetah in 40 seconds.
    Calculate the total distance covered by the cheetah. (3mks)
    16 2
    Area of a = ½ x 10 (15+30)                 area of c = ½ x 30 x 20
    = 225m                                                               = 300m
    Area of b = 30 x 10                              total = 225 + 300 + 300
    = 300m                                                        = 825m
    M1-areas
    M1-operation
    A1
    3

SECTION II
Answer any five questions in this section.

  1. A rectangular tank whose internal dimensions are 2.4m by 2.5m by 3.7m is two thirds full of juice.
    1. Calculate the volume of the juice in litres. (3mks)
      2/3x 2.4 x 2.5 x 3.7
      14.8m3
      1m3 →1000L                                                    M1-vol
      14.8m3 →?                                                       M1-convertion
      14.8 x 1000                                                    A1
      14800 litres                                                      3
    2. The juice is parked in small packets in a shape of right pyramid with equilateral triangles of sides 20cm. the height of each packet is 15cm. a full packet is sold at kshs. 50 per packet.
      Calculate:
      1. The volume of the juice in cm3 of each packet to the nearest whole number. (3mks)
        Base area
        = ½ ab sin C
        = ½ x 20x20sin 60
        = 173.21
        Vol= 1/3 x 173.21 x 15                              M1-base area of Δ face
        =866.025                                                  M1-vol. of pyramid expressed
        =866cm3                                                   A1
                                                                          3
      2. The number of full packets of juice. (2mks)
        1m3 = 1000000cm3
        14.8m3 = ?
        14.8 x 1000000cm3
        No of packets = 14.8x106
                                       866
        =17089.58                                                   M1-devision
        =17,089                                                       A1- CAO whole (packets)
                                                                               2
      3. The amount of money realized from the sale of juice. (2mks)
        17089 x 50                                     M1-sales expressed
        Sh. 854,450                                    A1
                                                               2
  2. The masses in kilograms of patients who attended a clinic on a certain day were recorded as follows.

    67

    49

    57

    58

    69

    58

    39

    61

    51

    47

    38

    59

    46

    52

    60

    72

    59

    49

    54

    52

    69

    62

    58

    67

    63

    59

    65

    58

    49

    44

    49

    41

    70

    58

    54

    60

    60

    59

    42

    41

    79

    52

    51

    48

    54

    59

    62

    73

    48

    54


    1. Starting with the class 35-39, make a frequency distribution table for the data. (2mks)
      1. (2mks)

      Mass

      F

      Tally

      Mid (x)

      fx

      Cf

      35-39

      2

       

      37

      74

      2

      40-44

      4

       

      42

      168

      6

      45-49

      8

       

      47

      376

      14

      50-54

      9

       

      52

      468

      23

      55-59

      11

       

      57

      627

      34

      60-64

      7

       

      62

      434

      41

      65-69

      5

       

      67

      335

      46

      70-74

      3

       

      72

      216

      49

      75-79

      1

       

      77

      77

      50

       

      £f=50

         

      £fx=2775

       
    2.  
      1. Calculate the mean mass. (3mks)
        X=£fx
             £f
        = 2775
            50                                                                               B1-column completed
        =55.5kg                                                                      M1
                                                                                           A1
                                                                                           3
      2. Calculate the median mass. (3mks)
        18ii
        = 54.5 +0.91                                                        B1-cf column
        = 55.41                                                                M1-values correctly substituted
    3. On the grid provided draw a frequency polygon to represent the data. (2mks)
      18c
  3. The position vectors of A, B and C are 3i – 2j, -6i + 4j and -9i – 3j respectively.
    1. State the column vectors.

      1. AB (2mks)
        19ai
      2. CB (2mks)
        CB=B-C
        WW
    2. Find the distance from A to C. (2mks)
      AC=C-A
      19b
    3. Find the coordinates of the midpoint of AC. (2mks)
      19c
    4. If point C΄ is the image of C under translation vector 119dqstn
      19d
  4. Complete the table below for the function y= x2 – 3x + 6 in the range -2 ≤ x ≤ 8. (2mks)

    X

    -2

    -1

    0

    1

    2

    3

    4

    5

    6

    7

    8

    Y

    16

    10

    6

    4

    4

    6

    10

    16

    24

    34

    46

     

    Y0

    Y1

    Y2

    Y3

    Y4

    Y5

    Y6

    Y7

    Y8

    Y9

    yn


    B2-all rates
    1. Use the trapezium rule with 10 strips to estimate the area bounded by the curve, y=x2- 3x + 6, the lines x = -2, x =8 and the x – axis. (3mks)
      Let h=1
      = ½ h [Y0 +Yn +2 (y1+y2+…)]
      =0.5 [16+46+2(10+6+4+4+6+10+16+24+34)]
      =0.5 (62+228)
      =145 square units
      M1
      M1
      A1
      3
    2. Use the mid – ordinate rule with 5 strips to estimate the area bounded by the curve, y = x2 – 3x + 6, the lines x = -2, x = and the x- axis. (3mks)
      A = h(y1+y2+……..yn)
      = 2 (10 + 4 + 6 + 16 + 34)
      = 140 sq units
      M1
      A1
      2
    3. By integration, determine the actual area bounded by the curve y = x2 – 3x + 6, the lines x = -2, x = 8, and the x – axis. (3mks)
      20c 1
      Intergrate form -2 to 8 (x2 – 3x +6 ).dx
      (170.7 – 96 + 48) – (-4 -6-12)                      M1
      122.7 + 22                                                    M1
      = 144.7 sq units                                             A1
                                                                             3
  5. The corner points A, B, C and D of a ranch are such that B is 8km directly East of A and C is 6km from B on a bearing of 30o. d is 7km from C on a bearing of 300o.
    1. Using a scale of 1cm to represent 1km, draw a diagram to show the positions of A, B, C and D.
      21 2
      (4mks)
      B1-PSA
      B1-PSB
      B1-PSC
      B1PSD
      4
    2. Use the scale drawing to determine:
      1. The bearing of A from D. (1mk)
        = 180 + 30
        = 201o
        ±1o                                     B1
      2. The distance BD in kilometers. (2mks)
        8.2cm
        8.2 x 1km
        =8.2km B1
        ±0.1 B1-conversion
        2
      3. The perimeter of the ranch in kilometers. (3mks)
        AD = 10cm = 10km
        P = 8km + 6km +7km + 10km               B1
        =31km                                                   M1
                                                                         A1
                                                                        3
  6. Johana and Muchiru contributes Ksh. 150,000 and Ksh. 180,000 every year respectively for a business, after one year Jacob joined the business and contributed Ksh. 135,000.
    1. Calculate the ratio of their investment after three years of business. (3mks)
      Muchiri’s contribution = 180000 x 3 = 540,000
      Johana’s contribution = 150000 x 3 = 450,000
      Jacob’s contribution = 135000 x 2 = 270,000

      Ratio Johana: Muchiri: Jacob                                       M1-contributions
      = 450,000: 540,000: 270,000                                        M1-expression
      = 5:6:3                                                                          A1-ratios simplified
                                                                                           3
    2. They agreed that 30% of the profits after 3 years be used to cater for the costs of running the businesses while the remaining would be shared proportionally. Calculate each person’s share if the profit after 3 years was shs. 240,000. (4mks)
      30 x 240000 = 72000
      100
      Remainder = 240000 - 72000
      = 168000
      5:6:3
      5 + 6 + 3 =14
      Johana’s = 5 x 168000 = 60000
                       14
      Muchiri = 6 x 168000 = 72000                M1-rem
                     14                                             M3-ratios each
      Jacobs = 3 x 168000 = 36000                  4
                     14
    3. If each re-invested their shares back into the business, find the new individual investment at the beginning of the fourth year. (3mks)
      Johana’s = 450000 + 60000 = 510000                  M2-additions
      Muchiri’s = 540000 + 72000 = 612000                  A1-all
      Jacob’s = 270000 + 36000 = 306000                    3
  7. The figure below shows the end wall of a building with the axes shown and 1M as the unit of measurement. The roof line is given by y= a + bx2, where a and b are constants.
    1. State the value of a. (1mk)
      A = y intercept
      A= 15                                            B1
    2. Calculate the value of b. (3mks)
      Y = 15 + bx2
      At x = -10, y=9 (-10,9)
      9= 15 + (-102)b
      9= 15 + 100b
      100b = 9 -15
      = -6                                          M1-for point (-10,9)
      B= -6/100 = -3/50                    M1- equation
      Or = 0.06                                 A1
                                                      3
    3. Calculate the values of y for x = 2, 4, 6, 8 and compete the table below. (2mks)

      X

      -10

      0

      2

      4

      6

      8

      10

      Y

      9

      15

      14.76

      14.04

      12.84

      11.16

      9


      Y = 15 – 3x2
                    50
    4. Calculate the area of the wall. (4mks)
      23d
  8. A ball is thrown upwards and its height after t seconds is 5 meters, where s = 20t – 5t2. Find
    1. The greatest height reached and the time when it is reached. (3mks)
      Velocity (v) = ds
                            dt
      v = 20-10t
      at maximum, v=0
      20 – 10t =0
      T=2 seconds                    M1 for ds/dt
      S=20(2) – 5 (22)               M1
      = 40 – 20                          A1
      =20m                                3
    2. The time when it returns to the original level. (3mks)
      At original level1 s=0
      20t – 5t2=0
      5t (4 – t) =0                     M1-eqn
      T=0 or 4 sec                   M1
      After 4 seconds              A1
                                             3
    3. Its velocity after 3 seconds. (2mks)
      V = 20 – 10t
      V = 20 – 10(3)
      = 20-30                          M1-substuted
      = -10m/s                         A1
                                             2
    4. Its acceleration during the throw. (2mks)
      If V= 20-10t
      Acceleration = dv            M1 for dv/dt
                              At             M1
      = -10ms-2                        2
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